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git/unpack-trees.c
Victoria Dye 68fcd48baf unpack-trees: add 'skip_cache_tree_update' option 
Add (disabled by default) option to skip the 'cache_tree_update()' at the
end of 'unpack_trees()'. In many cases, this cache tree update is redundant
because the caller of 'unpack_trees()' immediately follows it with
'prime_cache_tree()', rebuilding the entire cache tree from scratch. While
these operations aren't the most expensive part of operations like 'git
reset', the duplicate calls still create a minor unnecessary slowdown.

Introduce an option for callers to skip the 'cache_tree_update()' in
'unpack_trees()' if it is redundant (that is, if 'prime_cache_tree()' is
called afterwards). At the moment, no 'unpack_trees()' callers use the new
option; they will be updated in subsequent patches.

Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
2022-11-10 21:49:34 -05:00

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#include "cache.h"
#include "strvec.h"
#include "repository.h"
#include "config.h"
#include "dir.h"
#include "tree.h"
#include "tree-walk.h"
#include "cache-tree.h"
#include "unpack-trees.h"
#include "progress.h"
#include "refs.h"
#include "attr.h"
#include "split-index.h"
#include "sparse-index.h"
#include "submodule.h"
#include "submodule-config.h"
#include "fsmonitor.h"
#include "object-store.h"
#include "promisor-remote.h"
#include "entry.h"
#include "parallel-checkout.h"
#include "sparse-index.h"
/*
* Error messages expected by scripts out of plumbing commands such as
* read-tree. Non-scripted Porcelain is not required to use these messages
* and in fact are encouraged to reword them to better suit their particular
* situation better. See how "git checkout" and "git merge" replaces
* them using setup_unpack_trees_porcelain(), for example.
*/
static const char *unpack_plumbing_errors[NB_UNPACK_TREES_WARNING_TYPES] = {
/* ERROR_WOULD_OVERWRITE */
"Entry '%s' would be overwritten by merge. Cannot merge.",
/* ERROR_NOT_UPTODATE_FILE */
"Entry '%s' not uptodate. Cannot merge.",
/* ERROR_NOT_UPTODATE_DIR */
"Updating '%s' would lose untracked files in it",
/* ERROR_CWD_IN_THE_WAY */
"Refusing to remove '%s' since it is the current working directory.",
/* ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN */
"Untracked working tree file '%s' would be overwritten by merge.",
/* ERROR_WOULD_LOSE_UNTRACKED_REMOVED */
"Untracked working tree file '%s' would be removed by merge.",
/* ERROR_BIND_OVERLAP */
"Entry '%s' overlaps with '%s'. Cannot bind.",
/* ERROR_WOULD_LOSE_SUBMODULE */
"Submodule '%s' cannot checkout new HEAD.",
/* NB_UNPACK_TREES_ERROR_TYPES; just a meta value */
"",
/* WARNING_SPARSE_NOT_UPTODATE_FILE */
"Path '%s' not uptodate; will not remove from working tree.",
/* WARNING_SPARSE_UNMERGED_FILE */
"Path '%s' unmerged; will not remove from working tree.",
/* WARNING_SPARSE_ORPHANED_NOT_OVERWRITTEN */
"Path '%s' already present; will not overwrite with sparse update.",
};
#define ERRORMSG(o,type) \
( ((o) && (o)->msgs[(type)]) \
? ((o)->msgs[(type)]) \
: (unpack_plumbing_errors[(type)]) )
static const char *super_prefixed(const char *path)
{
/*
* It is necessary and sufficient to have two static buffers
* here, as the return value of this function is fed to
* error() using the unpack_*_errors[] templates we see above.
*/
static struct strbuf buf[2] = {STRBUF_INIT, STRBUF_INIT};
static int super_prefix_len = -1;
static unsigned idx = ARRAY_SIZE(buf) - 1;
if (super_prefix_len < 0) {
const char *super_prefix = get_super_prefix();
if (!super_prefix) {
super_prefix_len = 0;
} else {
int i;
for (i = 0; i < ARRAY_SIZE(buf); i++)
strbuf_addstr(&buf[i], super_prefix);
super_prefix_len = buf[0].len;
}
}
if (!super_prefix_len)
return path;
if (++idx >= ARRAY_SIZE(buf))
idx = 0;
strbuf_setlen(&buf[idx], super_prefix_len);
strbuf_addstr(&buf[idx], path);
return buf[idx].buf;
}
void setup_unpack_trees_porcelain(struct unpack_trees_options *opts,
const char *cmd)
{
int i;
const char **msgs = opts->msgs;
const char *msg;
strvec_init(&opts->msgs_to_free);
if (!strcmp(cmd, "checkout"))
msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
? _("Your local changes to the following files would be overwritten by checkout:\n%%s"
"Please commit your changes or stash them before you switch branches.")
: _("Your local changes to the following files would be overwritten by checkout:\n%%s");
else if (!strcmp(cmd, "merge"))
msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
? _("Your local changes to the following files would be overwritten by merge:\n%%s"
"Please commit your changes or stash them before you merge.")
: _("Your local changes to the following files would be overwritten by merge:\n%%s");
else
msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
? _("Your local changes to the following files would be overwritten by %s:\n%%s"
"Please commit your changes or stash them before you %s.")
: _("Your local changes to the following files would be overwritten by %s:\n%%s");
msgs[ERROR_WOULD_OVERWRITE] = msgs[ERROR_NOT_UPTODATE_FILE] =
strvec_pushf(&opts->msgs_to_free, msg, cmd, cmd);
msgs[ERROR_NOT_UPTODATE_DIR] =
_("Updating the following directories would lose untracked files in them:\n%s");
msgs[ERROR_CWD_IN_THE_WAY] =
_("Refusing to remove the current working directory:\n%s");
if (!strcmp(cmd, "checkout"))
msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
? _("The following untracked working tree files would be removed by checkout:\n%%s"
"Please move or remove them before you switch branches.")
: _("The following untracked working tree files would be removed by checkout:\n%%s");
else if (!strcmp(cmd, "merge"))
msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
? _("The following untracked working tree files would be removed by merge:\n%%s"
"Please move or remove them before you merge.")
: _("The following untracked working tree files would be removed by merge:\n%%s");
else
msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
? _("The following untracked working tree files would be removed by %s:\n%%s"
"Please move or remove them before you %s.")
: _("The following untracked working tree files would be removed by %s:\n%%s");
msgs[ERROR_WOULD_LOSE_UNTRACKED_REMOVED] =
strvec_pushf(&opts->msgs_to_free, msg, cmd, cmd);
if (!strcmp(cmd, "checkout"))
msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
? _("The following untracked working tree files would be overwritten by checkout:\n%%s"
"Please move or remove them before you switch branches.")
: _("The following untracked working tree files would be overwritten by checkout:\n%%s");
else if (!strcmp(cmd, "merge"))
msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
? _("The following untracked working tree files would be overwritten by merge:\n%%s"
"Please move or remove them before you merge.")
: _("The following untracked working tree files would be overwritten by merge:\n%%s");
else
msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
? _("The following untracked working tree files would be overwritten by %s:\n%%s"
"Please move or remove them before you %s.")
: _("The following untracked working tree files would be overwritten by %s:\n%%s");
msgs[ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN] =
strvec_pushf(&opts->msgs_to_free, msg, cmd, cmd);
/*
* Special case: ERROR_BIND_OVERLAP refers to a pair of paths, we
* cannot easily display it as a list.
*/
msgs[ERROR_BIND_OVERLAP] = _("Entry '%s' overlaps with '%s'. Cannot bind.");
msgs[ERROR_WOULD_LOSE_SUBMODULE] =
_("Cannot update submodule:\n%s");
msgs[WARNING_SPARSE_NOT_UPTODATE_FILE] =
_("The following paths are not up to date and were left despite sparse patterns:\n%s");
msgs[WARNING_SPARSE_UNMERGED_FILE] =
_("The following paths are unmerged and were left despite sparse patterns:\n%s");
msgs[WARNING_SPARSE_ORPHANED_NOT_OVERWRITTEN] =
_("The following paths were already present and thus not updated despite sparse patterns:\n%s");
opts->show_all_errors = 1;
/* rejected paths may not have a static buffer */
for (i = 0; i < ARRAY_SIZE(opts->unpack_rejects); i++)
opts->unpack_rejects[i].strdup_strings = 1;
}
void clear_unpack_trees_porcelain(struct unpack_trees_options *opts)
{
strvec_clear(&opts->msgs_to_free);
memset(opts->msgs, 0, sizeof(opts->msgs));
}
static int do_add_entry(struct unpack_trees_options *o, struct cache_entry *ce,
unsigned int set, unsigned int clear)
{
clear |= CE_HASHED;
if (set & CE_REMOVE)
set |= CE_WT_REMOVE;
ce->ce_flags = (ce->ce_flags & ~clear) | set;
return add_index_entry(&o->result, ce,
ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
}
static void add_entry(struct unpack_trees_options *o,
const struct cache_entry *ce,
unsigned int set, unsigned int clear)
{
do_add_entry(o, dup_cache_entry(ce, &o->result), set, clear);
}
/*
* add error messages on path <path>
* corresponding to the type <e> with the message <msg>
* indicating if it should be display in porcelain or not
*/
static int add_rejected_path(struct unpack_trees_options *o,
enum unpack_trees_error_types e,
const char *path)
{
if (o->quiet)
return -1;
if (!o->show_all_errors)
return error(ERRORMSG(o, e), super_prefixed(path));
/*
* Otherwise, insert in a list for future display by
* display_(error|warning)_msgs()
*/
string_list_append(&o->unpack_rejects[e], path);
return -1;
}
/*
* display all the error messages stored in a nice way
*/
static void display_error_msgs(struct unpack_trees_options *o)
{
int e;
unsigned error_displayed = 0;
for (e = 0; e < NB_UNPACK_TREES_ERROR_TYPES; e++) {
struct string_list *rejects = &o->unpack_rejects[e];
if (rejects->nr > 0) {
int i;
struct strbuf path = STRBUF_INIT;
error_displayed = 1;
for (i = 0; i < rejects->nr; i++)
strbuf_addf(&path, "\t%s\n", rejects->items[i].string);
error(ERRORMSG(o, e), super_prefixed(path.buf));
strbuf_release(&path);
}
string_list_clear(rejects, 0);
}
if (error_displayed)
fprintf(stderr, _("Aborting\n"));
}
/*
* display all the warning messages stored in a nice way
*/
static void display_warning_msgs(struct unpack_trees_options *o)
{
int e;
unsigned warning_displayed = 0;
for (e = NB_UNPACK_TREES_ERROR_TYPES + 1;
e < NB_UNPACK_TREES_WARNING_TYPES; e++) {
struct string_list *rejects = &o->unpack_rejects[e];
if (rejects->nr > 0) {
int i;
struct strbuf path = STRBUF_INIT;
warning_displayed = 1;
for (i = 0; i < rejects->nr; i++)
strbuf_addf(&path, "\t%s\n", rejects->items[i].string);
warning(ERRORMSG(o, e), super_prefixed(path.buf));
strbuf_release(&path);
}
string_list_clear(rejects, 0);
}
if (warning_displayed)
fprintf(stderr, _("After fixing the above paths, you may want to run `git sparse-checkout reapply`.\n"));
}
static int check_submodule_move_head(const struct cache_entry *ce,
const char *old_id,
const char *new_id,
struct unpack_trees_options *o)
{
unsigned flags = SUBMODULE_MOVE_HEAD_DRY_RUN;
const struct submodule *sub = submodule_from_ce(ce);
if (!sub)
return 0;
if (o->reset)
flags |= SUBMODULE_MOVE_HEAD_FORCE;
if (submodule_move_head(ce->name, old_id, new_id, flags))
return add_rejected_path(o, ERROR_WOULD_LOSE_SUBMODULE, ce->name);
return 0;
}
/*
* Perform the loading of the repository's gitmodules file. This function is
* used by 'check_update()' to perform loading of the gitmodules file in two
* different situations:
* (1) before removing entries from the working tree if the gitmodules file has
* been marked for removal. This situation is specified by 'state' == NULL.
* (2) before checking out entries to the working tree if the gitmodules file
* has been marked for update. This situation is specified by 'state' != NULL.
*/
static void load_gitmodules_file(struct index_state *index,
struct checkout *state)
{
int pos = index_name_pos(index, GITMODULES_FILE, strlen(GITMODULES_FILE));
if (pos >= 0) {
struct cache_entry *ce = index->cache[pos];
if (!state && ce->ce_flags & CE_WT_REMOVE) {
repo_read_gitmodules(the_repository, 0);
} else if (state && (ce->ce_flags & CE_UPDATE)) {
submodule_free(the_repository);
checkout_entry(ce, state, NULL, NULL);
repo_read_gitmodules(the_repository, 0);
}
}
}
static struct progress *get_progress(struct unpack_trees_options *o,
struct index_state *index)
{
unsigned cnt = 0, total = 0;
if (!o->update || !o->verbose_update)
return NULL;
for (; cnt < index->cache_nr; cnt++) {
const struct cache_entry *ce = index->cache[cnt];
if (ce->ce_flags & (CE_UPDATE | CE_WT_REMOVE))
total++;
}
return start_delayed_progress(_("Updating files"), total);
}
static void setup_collided_checkout_detection(struct checkout *state,
struct index_state *index)
{
int i;
state->clone = 1;
for (i = 0; i < index->cache_nr; i++)
index->cache[i]->ce_flags &= ~CE_MATCHED;
}
static void report_collided_checkout(struct index_state *index)
{
struct string_list list = STRING_LIST_INIT_NODUP;
int i;
for (i = 0; i < index->cache_nr; i++) {
struct cache_entry *ce = index->cache[i];
if (!(ce->ce_flags & CE_MATCHED))
continue;
string_list_append(&list, ce->name);
ce->ce_flags &= ~CE_MATCHED;
}
list.cmp = fspathcmp;
string_list_sort(&list);
if (list.nr) {
warning(_("the following paths have collided (e.g. case-sensitive paths\n"
"on a case-insensitive filesystem) and only one from the same\n"
"colliding group is in the working tree:\n"));
for (i = 0; i < list.nr; i++)
fprintf(stderr, " '%s'\n", list.items[i].string);
}
string_list_clear(&list, 0);
}
static int must_checkout(const struct cache_entry *ce)
{
return ce->ce_flags & CE_UPDATE;
}
static int check_updates(struct unpack_trees_options *o,
struct index_state *index)
{
unsigned cnt = 0;
int errs = 0;
struct progress *progress;
struct checkout state = CHECKOUT_INIT;
int i, pc_workers, pc_threshold;
trace_performance_enter();
state.force = 1;
state.quiet = 1;
state.refresh_cache = 1;
state.istate = index;
clone_checkout_metadata(&state.meta, &o->meta, NULL);
if (!o->update || o->dry_run) {
remove_marked_cache_entries(index, 0);
trace_performance_leave("check_updates");
return 0;
}
if (o->clone)
setup_collided_checkout_detection(&state, index);
progress = get_progress(o, index);
/* Start with clean cache to avoid using any possibly outdated info. */
invalidate_lstat_cache();
git_attr_set_direction(GIT_ATTR_CHECKOUT);
if (should_update_submodules())
load_gitmodules_file(index, NULL);
for (i = 0; i < index->cache_nr; i++) {
const struct cache_entry *ce = index->cache[i];
if (ce->ce_flags & CE_WT_REMOVE) {
display_progress(progress, ++cnt);
unlink_entry(ce);
}
}
remove_marked_cache_entries(index, 0);
remove_scheduled_dirs();
if (should_update_submodules())
load_gitmodules_file(index, &state);
if (has_promisor_remote())
/*
* Prefetch the objects that are to be checked out in the loop
* below.
*/
prefetch_cache_entries(index, must_checkout);
get_parallel_checkout_configs(&pc_workers, &pc_threshold);
enable_delayed_checkout(&state);
if (pc_workers > 1)
init_parallel_checkout();
for (i = 0; i < index->cache_nr; i++) {
struct cache_entry *ce = index->cache[i];
if (must_checkout(ce)) {
size_t last_pc_queue_size = pc_queue_size();
if (ce->ce_flags & CE_WT_REMOVE)
BUG("both update and delete flags are set on %s",
ce->name);
ce->ce_flags &= ~CE_UPDATE;
errs |= checkout_entry(ce, &state, NULL, NULL);
if (last_pc_queue_size == pc_queue_size())
display_progress(progress, ++cnt);
}
}
if (pc_workers > 1)
errs |= run_parallel_checkout(&state, pc_workers, pc_threshold,
progress, &cnt);
stop_progress(&progress);
errs |= finish_delayed_checkout(&state, o->verbose_update);
git_attr_set_direction(GIT_ATTR_CHECKIN);
if (o->clone)
report_collided_checkout(index);
trace_performance_leave("check_updates");
return errs != 0;
}
static int verify_uptodate_sparse(const struct cache_entry *ce,
struct unpack_trees_options *o);
static int verify_absent_sparse(const struct cache_entry *ce,
enum unpack_trees_error_types,
struct unpack_trees_options *o);
static int apply_sparse_checkout(struct index_state *istate,
struct cache_entry *ce,
struct unpack_trees_options *o)
{
int was_skip_worktree = ce_skip_worktree(ce);
if (ce->ce_flags & CE_NEW_SKIP_WORKTREE)
ce->ce_flags |= CE_SKIP_WORKTREE;
else
ce->ce_flags &= ~CE_SKIP_WORKTREE;
if (was_skip_worktree != ce_skip_worktree(ce)) {
ce->ce_flags |= CE_UPDATE_IN_BASE;
mark_fsmonitor_invalid(istate, ce);
istate->cache_changed |= CE_ENTRY_CHANGED;
}
/*
* if (!was_skip_worktree && !ce_skip_worktree()) {
* This is perfectly normal. Move on;
* }
*/
/*
* Merge strategies may set CE_UPDATE|CE_REMOVE outside checkout
* area as a result of ce_skip_worktree() shortcuts in
* verify_absent() and verify_uptodate().
* Make sure they don't modify worktree if they are already
* outside checkout area
*/
if (was_skip_worktree && ce_skip_worktree(ce)) {
ce->ce_flags &= ~CE_UPDATE;
/*
* By default, when CE_REMOVE is on, CE_WT_REMOVE is also
* on to get that file removed from both index and worktree.
* If that file is already outside worktree area, don't
* bother remove it.
*/
if (ce->ce_flags & CE_REMOVE)
ce->ce_flags &= ~CE_WT_REMOVE;
}
if (!was_skip_worktree && ce_skip_worktree(ce)) {
/*
* If CE_UPDATE is set, verify_uptodate() must be called already
* also stat info may have lost after merged_entry() so calling
* verify_uptodate() again may fail
*/
if (!(ce->ce_flags & CE_UPDATE) &&
verify_uptodate_sparse(ce, o)) {
ce->ce_flags &= ~CE_SKIP_WORKTREE;
return -1;
}
ce->ce_flags |= CE_WT_REMOVE;
ce->ce_flags &= ~CE_UPDATE;
}
if (was_skip_worktree && !ce_skip_worktree(ce)) {
if (verify_absent_sparse(ce, WARNING_SPARSE_ORPHANED_NOT_OVERWRITTEN, o))
return -1;
ce->ce_flags |= CE_UPDATE;
}
return 0;
}
static int warn_conflicted_path(struct index_state *istate,
int i,
struct unpack_trees_options *o)
{
char *conflicting_path = istate->cache[i]->name;
int count = 0;
add_rejected_path(o, WARNING_SPARSE_UNMERGED_FILE, conflicting_path);
/* Find out how many higher stage entries are at same path */
while ((++count) + i < istate->cache_nr &&
!strcmp(conflicting_path, istate->cache[count + i]->name))
; /* do nothing */
return count;
}
static inline int call_unpack_fn(const struct cache_entry * const *src,
struct unpack_trees_options *o)
{
int ret = o->fn(src, o);
if (ret > 0)
ret = 0;
return ret;
}
static void mark_ce_used(struct cache_entry *ce, struct unpack_trees_options *o)
{
ce->ce_flags |= CE_UNPACKED;
if (o->cache_bottom < o->src_index->cache_nr &&
o->src_index->cache[o->cache_bottom] == ce) {
int bottom = o->cache_bottom;
while (bottom < o->src_index->cache_nr &&
o->src_index->cache[bottom]->ce_flags & CE_UNPACKED)
bottom++;
o->cache_bottom = bottom;
}
}
static void mark_all_ce_unused(struct index_state *index)
{
int i;
for (i = 0; i < index->cache_nr; i++)
index->cache[i]->ce_flags &= ~(CE_UNPACKED | CE_ADDED | CE_NEW_SKIP_WORKTREE);
}
static int locate_in_src_index(const struct cache_entry *ce,
struct unpack_trees_options *o)
{
struct index_state *index = o->src_index;
int len = ce_namelen(ce);
int pos = index_name_pos(index, ce->name, len);
if (pos < 0)
pos = -1 - pos;
return pos;
}
/*
* We call unpack_index_entry() with an unmerged cache entry
* only in diff-index, and it wants a single callback. Skip
* the other unmerged entry with the same name.
*/
static void mark_ce_used_same_name(struct cache_entry *ce,
struct unpack_trees_options *o)
{
struct index_state *index = o->src_index;
int len = ce_namelen(ce);
int pos;
for (pos = locate_in_src_index(ce, o); pos < index->cache_nr; pos++) {
struct cache_entry *next = index->cache[pos];
if (len != ce_namelen(next) ||
memcmp(ce->name, next->name, len))
break;
mark_ce_used(next, o);
}
}
static struct cache_entry *next_cache_entry(struct unpack_trees_options *o)
{
const struct index_state *index = o->src_index;
int pos = o->cache_bottom;
while (pos < index->cache_nr) {
struct cache_entry *ce = index->cache[pos];
if (!(ce->ce_flags & CE_UNPACKED))
return ce;
pos++;
}
return NULL;
}
static void add_same_unmerged(const struct cache_entry *ce,
struct unpack_trees_options *o)
{
struct index_state *index = o->src_index;
int len = ce_namelen(ce);
int pos = index_name_pos(index, ce->name, len);
if (0 <= pos)
die("programming error in a caller of mark_ce_used_same_name");
for (pos = -pos - 1; pos < index->cache_nr; pos++) {
struct cache_entry *next = index->cache[pos];
if (len != ce_namelen(next) ||
memcmp(ce->name, next->name, len))
break;
add_entry(o, next, 0, 0);
mark_ce_used(next, o);
}
}
static int unpack_index_entry(struct cache_entry *ce,
struct unpack_trees_options *o)
{
const struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, };
int ret;
src[0] = ce;
mark_ce_used(ce, o);
if (ce_stage(ce)) {
if (o->skip_unmerged) {
add_entry(o, ce, 0, 0);
return 0;
}
}
ret = call_unpack_fn(src, o);
if (ce_stage(ce))
mark_ce_used_same_name(ce, o);
return ret;
}
static int find_cache_pos(struct traverse_info *, const char *p, size_t len);
static void restore_cache_bottom(struct traverse_info *info, int bottom)
{
struct unpack_trees_options *o = info->data;
if (o->diff_index_cached)
return;
o->cache_bottom = bottom;
}
static int switch_cache_bottom(struct traverse_info *info)
{
struct unpack_trees_options *o = info->data;
int ret, pos;
if (o->diff_index_cached)
return 0;
ret = o->cache_bottom;
pos = find_cache_pos(info->prev, info->name, info->namelen);
if (pos < -1)
o->cache_bottom = -2 - pos;
else if (pos < 0)
o->cache_bottom = o->src_index->cache_nr;
return ret;
}
static inline int are_same_oid(struct name_entry *name_j, struct name_entry *name_k)
{
return !is_null_oid(&name_j->oid) && !is_null_oid(&name_k->oid) && oideq(&name_j->oid, &name_k->oid);
}
static int all_trees_same_as_cache_tree(int n, unsigned long dirmask,
struct name_entry *names,
struct traverse_info *info)
{
struct unpack_trees_options *o = info->data;
int i;
if (!o->merge || dirmask != ((1 << n) - 1))
return 0;
for (i = 1; i < n; i++)
if (!are_same_oid(names, names + i))
return 0;
return cache_tree_matches_traversal(o->src_index->cache_tree, names, info);
}
static int index_pos_by_traverse_info(struct name_entry *names,
struct traverse_info *info)
{
struct unpack_trees_options *o = info->data;
struct strbuf name = STRBUF_INIT;
int pos;
strbuf_make_traverse_path(&name, info, names->path, names->pathlen);
strbuf_addch(&name, '/');
pos = index_name_pos(o->src_index, name.buf, name.len);
if (pos >= 0) {
if (!o->src_index->sparse_index ||
!(o->src_index->cache[pos]->ce_flags & CE_SKIP_WORKTREE))
BUG("This is a directory and should not exist in index");
} else {
pos = -pos - 1;
}
if (pos >= o->src_index->cache_nr ||
!starts_with(o->src_index->cache[pos]->name, name.buf) ||
(pos > 0 && starts_with(o->src_index->cache[pos-1]->name, name.buf)))
BUG("pos %d doesn't point to the first entry of %s in index",
pos, name.buf);
strbuf_release(&name);
return pos;
}
/*
* Fast path if we detect that all trees are the same as cache-tree at this
* path. We'll walk these trees in an iterative loop using cache-tree/index
* instead of ODB since we already know what these trees contain.
*/
static int traverse_by_cache_tree(int pos, int nr_entries, int nr_names,
struct traverse_info *info)
{
struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, };
struct unpack_trees_options *o = info->data;
struct cache_entry *tree_ce = NULL;
int ce_len = 0;
int i, d;
if (!o->merge)
BUG("We need cache-tree to do this optimization");
/*
* Do what unpack_callback() and unpack_single_entry() normally
* do. But we walk all paths in an iterative loop instead.
*
* D/F conflicts and higher stage entries are not a concern
* because cache-tree would be invalidated and we would never
* get here in the first place.
*/
for (i = 0; i < nr_entries; i++) {
int new_ce_len, len, rc;
src[0] = o->src_index->cache[pos + i];
len = ce_namelen(src[0]);
new_ce_len = cache_entry_size(len);
if (new_ce_len > ce_len) {
new_ce_len <<= 1;
tree_ce = xrealloc(tree_ce, new_ce_len);
memset(tree_ce, 0, new_ce_len);
ce_len = new_ce_len;
tree_ce->ce_flags = create_ce_flags(0);
for (d = 1; d <= nr_names; d++)
src[d] = tree_ce;
}
tree_ce->ce_mode = src[0]->ce_mode;
tree_ce->ce_namelen = len;
oidcpy(&tree_ce->oid, &src[0]->oid);
memcpy(tree_ce->name, src[0]->name, len + 1);
rc = call_unpack_fn((const struct cache_entry * const *)src, o);
if (rc < 0) {
free(tree_ce);
return rc;
}
mark_ce_used(src[0], o);
}
free(tree_ce);
if (o->debug_unpack)
printf("Unpacked %d entries from %s to %s using cache-tree\n",
nr_entries,
o->src_index->cache[pos]->name,
o->src_index->cache[pos + nr_entries - 1]->name);
return 0;
}
static int traverse_trees_recursive(int n, unsigned long dirmask,
unsigned long df_conflicts,
struct name_entry *names,
struct traverse_info *info)
{
struct unpack_trees_options *o = info->data;
int i, ret, bottom;
int nr_buf = 0;
struct tree_desc t[MAX_UNPACK_TREES];
void *buf[MAX_UNPACK_TREES];
struct traverse_info newinfo;
struct name_entry *p;
int nr_entries;
nr_entries = all_trees_same_as_cache_tree(n, dirmask, names, info);
if (nr_entries > 0) {
int pos = index_pos_by_traverse_info(names, info);
if (!o->merge || df_conflicts)
BUG("Wrong condition to get here buddy");
/*
* All entries up to 'pos' must have been processed
* (i.e. marked CE_UNPACKED) at this point. But to be safe,
* save and restore cache_bottom anyway to not miss
* unprocessed entries before 'pos'.
*/
bottom = o->cache_bottom;
ret = traverse_by_cache_tree(pos, nr_entries, n, info);
o->cache_bottom = bottom;
return ret;
}
p = names;
while (!p->mode)
p++;
newinfo = *info;
newinfo.prev = info;
newinfo.pathspec = info->pathspec;
newinfo.name = p->path;
newinfo.namelen = p->pathlen;
newinfo.mode = p->mode;
newinfo.pathlen = st_add3(newinfo.pathlen, tree_entry_len(p), 1);
newinfo.df_conflicts |= df_conflicts;
/*
* Fetch the tree from the ODB for each peer directory in the
* n commits.
*
* For 2- and 3-way traversals, we try to avoid hitting the
* ODB twice for the same OID. This should yield a nice speed
* up in checkouts and merges when the commits are similar.
*
* We don't bother doing the full O(n^2) search for larger n,
* because wider traversals don't happen that often and we
* avoid the search setup.
*
* When 2 peer OIDs are the same, we just copy the tree
* descriptor data. This implicitly borrows the buffer
* data from the earlier cell.
*/
for (i = 0; i < n; i++, dirmask >>= 1) {
if (i > 0 && are_same_oid(&names[i], &names[i - 1]))
t[i] = t[i - 1];
else if (i > 1 && are_same_oid(&names[i], &names[i - 2]))
t[i] = t[i - 2];
else {
const struct object_id *oid = NULL;
if (dirmask & 1)
oid = &names[i].oid;
buf[nr_buf++] = fill_tree_descriptor(the_repository, t + i, oid);
}
}
bottom = switch_cache_bottom(&newinfo);
ret = traverse_trees(o->src_index, n, t, &newinfo);
restore_cache_bottom(&newinfo, bottom);
for (i = 0; i < nr_buf; i++)
free(buf[i]);
return ret;
}
/*
* Compare the traverse-path to the cache entry without actually
* having to generate the textual representation of the traverse
* path.
*
* NOTE! This *only* compares up to the size of the traverse path
* itself - the caller needs to do the final check for the cache
* entry having more data at the end!
*/
static int do_compare_entry_piecewise(const struct cache_entry *ce,
const struct traverse_info *info,
const char *name, size_t namelen,
unsigned mode)
{
int pathlen, ce_len;
const char *ce_name;
if (info->prev) {
int cmp = do_compare_entry_piecewise(ce, info->prev,
info->name, info->namelen,
info->mode);
if (cmp)
return cmp;
}
pathlen = info->pathlen;
ce_len = ce_namelen(ce);
/* If ce_len < pathlen then we must have previously hit "name == directory" entry */
if (ce_len < pathlen)
return -1;
ce_len -= pathlen;
ce_name = ce->name + pathlen;
return df_name_compare(ce_name, ce_len, S_IFREG, name, namelen, mode);
}
static int do_compare_entry(const struct cache_entry *ce,
const struct traverse_info *info,
const char *name, size_t namelen,
unsigned mode)
{
int pathlen, ce_len;
const char *ce_name;
int cmp;
unsigned ce_mode;
/*
* If we have not precomputed the traverse path, it is quicker
* to avoid doing so. But if we have precomputed it,
* it is quicker to use the precomputed version.
*/
if (!info->traverse_path)
return do_compare_entry_piecewise(ce, info, name, namelen, mode);
cmp = strncmp(ce->name, info->traverse_path, info->pathlen);
if (cmp)
return cmp;
pathlen = info->pathlen;
ce_len = ce_namelen(ce);
if (ce_len < pathlen)
return -1;
ce_len -= pathlen;
ce_name = ce->name + pathlen;
ce_mode = S_ISSPARSEDIR(ce->ce_mode) ? S_IFDIR : S_IFREG;
return df_name_compare(ce_name, ce_len, ce_mode, name, namelen, mode);
}
static int compare_entry(const struct cache_entry *ce, const struct traverse_info *info, const struct name_entry *n)
{
int cmp = do_compare_entry(ce, info, n->path, n->pathlen, n->mode);
if (cmp)
return cmp;
/*
* At this point, we know that we have a prefix match. If ce
* is a sparse directory, then allow an exact match. This only
* works when the input name is a directory, since ce->name
* ends in a directory separator.
*/
if (S_ISSPARSEDIR(ce->ce_mode) &&
ce->ce_namelen == traverse_path_len(info, tree_entry_len(n)) + 1)
return 0;
/*
* Even if the beginning compared identically, the ce should
* compare as bigger than a directory leading up to it!
*/
return ce_namelen(ce) > traverse_path_len(info, tree_entry_len(n));
}
static int ce_in_traverse_path(const struct cache_entry *ce,
const struct traverse_info *info)
{
if (!info->prev)
return 1;
if (do_compare_entry(ce, info->prev,
info->name, info->namelen, info->mode))
return 0;
/*
* If ce (blob) is the same name as the path (which is a tree
* we will be descending into), it won't be inside it.
*/
return (info->pathlen < ce_namelen(ce));
}
static struct cache_entry *create_ce_entry(const struct traverse_info *info,
const struct name_entry *n,
int stage,
struct index_state *istate,
int is_transient,
int is_sparse_directory)
{
size_t len = traverse_path_len(info, tree_entry_len(n));
size_t alloc_len = is_sparse_directory ? len + 1 : len;
struct cache_entry *ce =
is_transient ?
make_empty_transient_cache_entry(alloc_len, NULL) :
make_empty_cache_entry(istate, alloc_len);
ce->ce_mode = create_ce_mode(n->mode);
ce->ce_flags = create_ce_flags(stage);
ce->ce_namelen = len;
oidcpy(&ce->oid, &n->oid);
/* len+1 because the cache_entry allocates space for NUL */
make_traverse_path(ce->name, len + 1, info, n->path, n->pathlen);
if (is_sparse_directory) {
ce->name[len] = '/';
ce->name[len + 1] = '\0';
ce->ce_namelen++;
ce->ce_flags |= CE_SKIP_WORKTREE;
}
return ce;
}
/*
* Determine whether the path specified by 'p' should be unpacked as a new
* sparse directory in a sparse index. A new sparse directory 'A/':
* - must be outside the sparse cone.
* - must not already be in the index (i.e., no index entry with name 'A/'
* exists).
* - must not have any child entries in the index (i.e., no index entry
* 'A/<something>' exists).
* If 'p' meets the above requirements, return 1; otherwise, return 0.
*/
static int entry_is_new_sparse_dir(const struct traverse_info *info,
const struct name_entry *p)
{
int res, pos;
struct strbuf dirpath = STRBUF_INIT;
struct unpack_trees_options *o = info->data;
if (!S_ISDIR(p->mode))
return 0;
/*
* If the path is inside the sparse cone, it can't be a sparse directory.
*/
strbuf_add(&dirpath, info->traverse_path, info->pathlen);
strbuf_add(&dirpath, p->path, p->pathlen);
strbuf_addch(&dirpath, '/');
if (path_in_cone_mode_sparse_checkout(dirpath.buf, o->src_index)) {
res = 0;
goto cleanup;
}
pos = index_name_pos_sparse(o->src_index, dirpath.buf, dirpath.len);
if (pos >= 0) {
/* Path is already in the index, not a new sparse dir */
res = 0;
goto cleanup;
}
/* Where would this sparse dir be inserted into the index? */
pos = -pos - 1;
if (pos >= o->src_index->cache_nr) {
/*
* Sparse dir would be inserted at the end of the index, so we
* know it has no child entries.
*/
res = 1;
goto cleanup;
}
/*
* If the dir has child entries in the index, the first would be at the
* position the sparse directory would be inserted. If the entry at this
* position is inside the dir, not a new sparse dir.
*/
res = strncmp(o->src_index->cache[pos]->name, dirpath.buf, dirpath.len);
cleanup:
strbuf_release(&dirpath);
return res;
}
/*
* Note that traverse_by_cache_tree() duplicates some logic in this function
* without actually calling it. If you change the logic here you may need to
* check and change there as well.
*/
static int unpack_single_entry(int n, unsigned long mask,
unsigned long dirmask,
struct cache_entry **src,
const struct name_entry *names,
const struct traverse_info *info,
int *is_new_sparse_dir)
{
int i;
struct unpack_trees_options *o = info->data;
unsigned long conflicts = info->df_conflicts | dirmask;
const struct name_entry *p = names;
*is_new_sparse_dir = 0;
if (mask == dirmask && !src[0]) {
/*
* If we're not in a sparse index, we can't unpack a directory
* without recursing into it, so we return.
*/
if (!o->src_index->sparse_index)
return 0;
/* Find first entry with a real name (we could use "mask" too) */
while (!p->mode)
p++;
/*
* If the directory is completely missing from the index but
* would otherwise be a sparse directory, we should unpack it.
* If not, we'll return and continue recursively traversing the
* tree.
*/
*is_new_sparse_dir = entry_is_new_sparse_dir(info, p);
if (!*is_new_sparse_dir)
return 0;
}
/*
* When we are unpacking a sparse directory, then this isn't necessarily
* a directory-file conflict.
*/
if (mask == dirmask &&
(*is_new_sparse_dir || (src[0] && S_ISSPARSEDIR(src[0]->ce_mode))))
conflicts = 0;
/*
* Ok, we've filled in up to any potential index entry in src[0],
* now do the rest.
*/
for (i = 0; i < n; i++) {
int stage;
unsigned int bit = 1ul << i;
if (conflicts & bit) {
src[i + o->merge] = o->df_conflict_entry;
continue;
}
if (!(mask & bit))
continue;
if (!o->merge)
stage = 0;
else if (i + 1 < o->head_idx)
stage = 1;
else if (i + 1 > o->head_idx)
stage = 3;
else
stage = 2;
/*
* If the merge bit is set, then the cache entries are
* discarded in the following block. In this case,
* construct "transient" cache_entries, as they are
* not stored in the index. otherwise construct the
* cache entry from the index aware logic.
*/
src[i + o->merge] = create_ce_entry(info, names + i, stage,
&o->result, o->merge,
bit & dirmask);
}
if (o->merge) {
int rc = call_unpack_fn((const struct cache_entry * const *)src,
o);
for (i = 0; i < n; i++) {
struct cache_entry *ce = src[i + o->merge];
if (ce != o->df_conflict_entry)
discard_cache_entry(ce);
}
return rc;
}
for (i = 0; i < n; i++)
if (src[i] && src[i] != o->df_conflict_entry)
if (do_add_entry(o, src[i], 0, 0))
return -1;
return 0;
}
static int unpack_failed(struct unpack_trees_options *o, const char *message)
{
discard_index(&o->result);
if (!o->quiet && !o->exiting_early) {
if (message)
return error("%s", message);
return -1;
}
return -1;
}
/*
* The tree traversal is looking at name p. If we have a matching entry,
* return it. If name p is a directory in the index, do not return
* anything, as we will want to match it when the traversal descends into
* the directory.
*/
static int find_cache_pos(struct traverse_info *info,
const char *p, size_t p_len)
{
int pos;
struct unpack_trees_options *o = info->data;
struct index_state *index = o->src_index;
int pfxlen = info->pathlen;
for (pos = o->cache_bottom; pos < index->cache_nr; pos++) {
const struct cache_entry *ce = index->cache[pos];
const char *ce_name, *ce_slash;
int cmp, ce_len;
if (ce->ce_flags & CE_UNPACKED) {
/*
* cache_bottom entry is already unpacked, so
* we can never match it; don't check it
* again.
*/
if (pos == o->cache_bottom)
++o->cache_bottom;
continue;
}
if (!ce_in_traverse_path(ce, info)) {
/*
* Check if we can skip future cache checks
* (because we're already past all possible
* entries in the traverse path).
*/
if (info->traverse_path) {
if (strncmp(ce->name, info->traverse_path,
info->pathlen) > 0)
break;
}
continue;
}
ce_name = ce->name + pfxlen;
ce_slash = strchr(ce_name, '/');
if (ce_slash)
ce_len = ce_slash - ce_name;
else
ce_len = ce_namelen(ce) - pfxlen;
cmp = name_compare(p, p_len, ce_name, ce_len);
/*
* Exact match; if we have a directory we need to
* delay returning it.
*/
if (!cmp)
return ce_slash ? -2 - pos : pos;
if (0 < cmp)
continue; /* keep looking */
/*
* ce_name sorts after p->path; could it be that we
* have files under p->path directory in the index?
* E.g. ce_name == "t-i", and p->path == "t"; we may
* have "t/a" in the index.
*/
if (p_len < ce_len && !memcmp(ce_name, p, p_len) &&
ce_name[p_len] < '/')
continue; /* keep looking */
break;
}
return -1;
}
/*
* Given a sparse directory entry 'ce', compare ce->name to
* info->traverse_path + p->path + '/' if info->traverse_path
* is non-empty.
*
* Compare ce->name to p->path + '/' otherwise. Note that
* ce->name must end in a trailing '/' because it is a sparse
* directory entry.
*/
static int sparse_dir_matches_path(const struct cache_entry *ce,
struct traverse_info *info,
const struct name_entry *p)
{
assert(S_ISSPARSEDIR(ce->ce_mode));
assert(ce->name[ce->ce_namelen - 1] == '/');
if (info->pathlen)
return ce->ce_namelen == info->pathlen + p->pathlen + 1 &&
ce->name[info->pathlen - 1] == '/' &&
!strncmp(ce->name, info->traverse_path, info->pathlen) &&
!strncmp(ce->name + info->pathlen, p->path, p->pathlen);
return ce->ce_namelen == p->pathlen + 1 &&
!strncmp(ce->name, p->path, p->pathlen);
}
static struct cache_entry *find_cache_entry(struct traverse_info *info,
const struct name_entry *p)
{
const char *path;
int pos = find_cache_pos(info, p->path, p->pathlen);
struct unpack_trees_options *o = info->data;
if (0 <= pos)
return o->src_index->cache[pos];
/*
* Check for a sparse-directory entry named "path/".
* Due to the input p->path not having a trailing
* slash, the negative 'pos' value overshoots the
* expected position, hence "-2" instead of "-1".
*/
pos = -pos - 2;
if (pos < 0 || pos >= o->src_index->cache_nr)
return NULL;
/*
* Due to lexicographic sorting and sparse directory
* entries ending with a trailing slash, our path as a
* sparse directory (e.g "subdir/") and our path as a
* file (e.g. "subdir") might be separated by other
* paths (e.g. "subdir-").
*/
while (pos >= 0) {
struct cache_entry *ce = o->src_index->cache[pos];
if (!skip_prefix(ce->name, info->traverse_path, &path) ||
strncmp(path, p->path, p->pathlen) ||
path[p->pathlen] != '/')
return NULL;
if (S_ISSPARSEDIR(ce->ce_mode) &&
sparse_dir_matches_path(ce, info, p))
return ce;
pos--;
}
return NULL;
}
static void debug_path(struct traverse_info *info)
{
if (info->prev) {
debug_path(info->prev);
if (*info->prev->name)
putchar('/');
}
printf("%s", info->name);
}
static void debug_name_entry(int i, struct name_entry *n)
{
printf("ent#%d %06o %s\n", i,
n->path ? n->mode : 0,
n->path ? n->path : "(missing)");
}
static void debug_unpack_callback(int n,
unsigned long mask,
unsigned long dirmask,
struct name_entry *names,
struct traverse_info *info)
{
int i;
printf("* unpack mask %lu, dirmask %lu, cnt %d ",
mask, dirmask, n);
debug_path(info);
putchar('\n');
for (i = 0; i < n; i++)
debug_name_entry(i, names + i);
}
/*
* Returns true if and only if the given cache_entry is a
* sparse-directory entry that matches the given name_entry
* from the tree walk at the given traverse_info.
*/
static int is_sparse_directory_entry(struct cache_entry *ce,
const struct name_entry *name,
struct traverse_info *info)
{
if (!ce || !name || !S_ISSPARSEDIR(ce->ce_mode))
return 0;
return sparse_dir_matches_path(ce, info, name);
}
static int unpack_sparse_callback(int n, unsigned long mask, unsigned long dirmask, struct name_entry *names, struct traverse_info *info)
{
struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, };
struct unpack_trees_options *o = info->data;
int ret, is_new_sparse_dir;
assert(o->merge);
/*
* Unlike in 'unpack_callback', where src[0] is derived from the index when
* merging, src[0] is a transient cache entry derived from the first tree
* provided. Create the temporary entry as if it came from a non-sparse index.
*/
if (!is_null_oid(&names[0].oid)) {
src[0] = create_ce_entry(info, &names[0], 0,
&o->result, 1,
dirmask & (1ul << 0));
src[0]->ce_flags |= (CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE);
}
/*
* 'unpack_single_entry' assumes that src[0] is derived directly from
* the index, rather than from an entry in 'names'. This is *not* true when
* merging a sparse directory, in which case names[0] is the "index" source
* entry. To match the expectations of 'unpack_single_entry', shift past the
* "index" tree (i.e., names[0]) and adjust 'names', 'n', 'mask', and
* 'dirmask' accordingly.
*/
ret = unpack_single_entry(n - 1, mask >> 1, dirmask >> 1, src, names + 1, info, &is_new_sparse_dir);
if (src[0])
discard_cache_entry(src[0]);
return ret >= 0 ? mask : -1;
}
/*
* Note that traverse_by_cache_tree() duplicates some logic in this function
* without actually calling it. If you change the logic here you may need to
* check and change there as well.
*/
static int unpack_callback(int n, unsigned long mask, unsigned long dirmask, struct name_entry *names, struct traverse_info *info)
{
struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, };
struct unpack_trees_options *o = info->data;
const struct name_entry *p = names;
int is_new_sparse_dir;
/* Find first entry with a real name (we could use "mask" too) */
while (!p->mode)
p++;
if (o->debug_unpack)
debug_unpack_callback(n, mask, dirmask, names, info);
/* Are we supposed to look at the index too? */
if (o->merge) {
while (1) {
int cmp;
struct cache_entry *ce;
if (o->diff_index_cached)
ce = next_cache_entry(o);
else
ce = find_cache_entry(info, p);
if (!ce)
break;
cmp = compare_entry(ce, info, p);
if (cmp < 0) {
if (unpack_index_entry(ce, o) < 0)
return unpack_failed(o, NULL);
continue;
}
if (!cmp) {
if (ce_stage(ce)) {
/*
* If we skip unmerged index
* entries, we'll skip this
* entry *and* the tree
* entries associated with it!
*/
if (o->skip_unmerged) {
add_same_unmerged(ce, o);
return mask;
}
}
src[0] = ce;
}
break;
}
}
if (unpack_single_entry(n, mask, dirmask, src, names, info, &is_new_sparse_dir))
return -1;
if (o->merge && src[0]) {
if (ce_stage(src[0]))
mark_ce_used_same_name(src[0], o);
else
mark_ce_used(src[0], o);
}
/* Now handle any directories.. */
if (dirmask) {
/* special case: "diff-index --cached" looking at a tree */
if (o->diff_index_cached &&
n == 1 && dirmask == 1 && S_ISDIR(names->mode)) {
int matches;
matches = cache_tree_matches_traversal(o->src_index->cache_tree,
names, info);
/*
* Everything under the name matches; skip the
* entire hierarchy. diff_index_cached codepath
* special cases D/F conflicts in such a way that
* it does not do any look-ahead, so this is safe.
*/
if (matches) {
/*
* Only increment the cache_bottom if the
* directory isn't a sparse directory index
* entry (if it is, it was already incremented)
* in 'mark_ce_used()'
*/
if (!src[0] || !S_ISSPARSEDIR(src[0]->ce_mode))
o->cache_bottom += matches;
return mask;
}
}
if (!is_sparse_directory_entry(src[0], p, info) &&
!is_new_sparse_dir &&
traverse_trees_recursive(n, dirmask, mask & ~dirmask,
names, info) < 0) {
return -1;
}
return mask;
}
return mask;
}
static int clear_ce_flags_1(struct index_state *istate,
struct cache_entry **cache, int nr,
struct strbuf *prefix,
int select_mask, int clear_mask,
struct pattern_list *pl,
enum pattern_match_result default_match,
int progress_nr);
/* Whole directory matching */
static int clear_ce_flags_dir(struct index_state *istate,
struct cache_entry **cache, int nr,
struct strbuf *prefix,
char *basename,
int select_mask, int clear_mask,
struct pattern_list *pl,
enum pattern_match_result default_match,
int progress_nr)
{
struct cache_entry **cache_end;
int dtype = DT_DIR;
int rc;
enum pattern_match_result ret, orig_ret;
orig_ret = path_matches_pattern_list(prefix->buf, prefix->len,
basename, &dtype, pl, istate);
strbuf_addch(prefix, '/');
/* If undecided, use matching result of parent dir in defval */
if (orig_ret == UNDECIDED)
ret = default_match;
else
ret = orig_ret;
for (cache_end = cache; cache_end != cache + nr; cache_end++) {
struct cache_entry *ce = *cache_end;
if (strncmp(ce->name, prefix->buf, prefix->len))
break;
}
if (pl->use_cone_patterns && orig_ret == MATCHED_RECURSIVE) {
struct cache_entry **ce = cache;
rc = cache_end - cache;
while (ce < cache_end) {
(*ce)->ce_flags &= ~clear_mask;
ce++;
}
} else if (pl->use_cone_patterns && orig_ret == NOT_MATCHED) {
rc = cache_end - cache;
} else {
rc = clear_ce_flags_1(istate, cache, cache_end - cache,
prefix,
select_mask, clear_mask,
pl, ret,
progress_nr);
}
strbuf_setlen(prefix, prefix->len - 1);
return rc;
}
/*
* Traverse the index, find every entry that matches according to
* o->pl. Do "ce_flags &= ~clear_mask" on those entries. Return the
* number of traversed entries.
*
* If select_mask is non-zero, only entries whose ce_flags has on of
* those bits enabled are traversed.
*
* cache : pointer to an index entry
* prefix_len : an offset to its path
*
* The current path ("prefix") including the trailing '/' is
* cache[0]->name[0..(prefix_len-1)]
* Top level path has prefix_len zero.
*/
static int clear_ce_flags_1(struct index_state *istate,
struct cache_entry **cache, int nr,
struct strbuf *prefix,
int select_mask, int clear_mask,
struct pattern_list *pl,
enum pattern_match_result default_match,
int progress_nr)
{
struct cache_entry **cache_end = nr ? cache + nr : cache;
/*
* Process all entries that have the given prefix and meet
* select_mask condition
*/
while(cache != cache_end) {
struct cache_entry *ce = *cache;
const char *name, *slash;
int len, dtype;
enum pattern_match_result ret;
display_progress(istate->progress, progress_nr);
if (select_mask && !(ce->ce_flags & select_mask)) {
cache++;
progress_nr++;
continue;
}
if (prefix->len && strncmp(ce->name, prefix->buf, prefix->len))
break;
name = ce->name + prefix->len;
slash = strchr(name, '/');
/* If it's a directory, try whole directory match first */
if (slash) {
int processed;
len = slash - name;
strbuf_add(prefix, name, len);
processed = clear_ce_flags_dir(istate, cache, cache_end - cache,
prefix,
prefix->buf + prefix->len - len,
select_mask, clear_mask,
pl, default_match,
progress_nr);
/* clear_c_f_dir eats a whole dir already? */
if (processed) {
cache += processed;
progress_nr += processed;
strbuf_setlen(prefix, prefix->len - len);
continue;
}
strbuf_addch(prefix, '/');
processed = clear_ce_flags_1(istate, cache, cache_end - cache,
prefix,
select_mask, clear_mask, pl,
default_match, progress_nr);
cache += processed;
progress_nr += processed;
strbuf_setlen(prefix, prefix->len - len - 1);
continue;
}
/* Non-directory */
dtype = ce_to_dtype(ce);
ret = path_matches_pattern_list(ce->name,
ce_namelen(ce),
name, &dtype, pl, istate);
if (ret == UNDECIDED)
ret = default_match;
if (ret == MATCHED || ret == MATCHED_RECURSIVE)
ce->ce_flags &= ~clear_mask;
cache++;
progress_nr++;
}
display_progress(istate->progress, progress_nr);
return nr - (cache_end - cache);
}
static int clear_ce_flags(struct index_state *istate,
int select_mask, int clear_mask,
struct pattern_list *pl,
int show_progress)
{
static struct strbuf prefix = STRBUF_INIT;
char label[100];
int rval;
strbuf_reset(&prefix);
if (show_progress)
istate->progress = start_delayed_progress(
_("Updating index flags"),
istate->cache_nr);
xsnprintf(label, sizeof(label), "clear_ce_flags(0x%08lx,0x%08lx)",
(unsigned long)select_mask, (unsigned long)clear_mask);
trace2_region_enter("unpack_trees", label, the_repository);
rval = clear_ce_flags_1(istate,
istate->cache,
istate->cache_nr,
&prefix,
select_mask, clear_mask,
pl, 0, 0);
trace2_region_leave("unpack_trees", label, the_repository);
stop_progress(&istate->progress);
return rval;
}
/*
* Set/Clear CE_NEW_SKIP_WORKTREE according to $GIT_DIR/info/sparse-checkout
*/
static void mark_new_skip_worktree(struct pattern_list *pl,
struct index_state *istate,
int select_flag, int skip_wt_flag,
int show_progress)
{
int i;
/*
* 1. Pretend the narrowest worktree: only unmerged entries
* are checked out
*/
for (i = 0; i < istate->cache_nr; i++) {
struct cache_entry *ce = istate->cache[i];
if (select_flag && !(ce->ce_flags & select_flag))
continue;
if (!ce_stage(ce) && !(ce->ce_flags & CE_CONFLICTED))
ce->ce_flags |= skip_wt_flag;
else
ce->ce_flags &= ~skip_wt_flag;
}
/*
* 2. Widen worktree according to sparse-checkout file.
* Matched entries will have skip_wt_flag cleared (i.e. "in")
*/
clear_ce_flags(istate, select_flag, skip_wt_flag, pl, show_progress);
}
static void populate_from_existing_patterns(struct unpack_trees_options *o,
struct pattern_list *pl)
{
if (get_sparse_checkout_patterns(pl) < 0)
o->skip_sparse_checkout = 1;
else
o->pl = pl;
}
static void update_sparsity_for_prefix(const char *prefix,
struct index_state *istate)
{
int prefix_len = strlen(prefix);
struct strbuf ce_prefix = STRBUF_INIT;
if (!istate->sparse_index)
return;
while (prefix_len > 0 && prefix[prefix_len - 1] == '/')
prefix_len--;
if (prefix_len <= 0)
BUG("Invalid prefix passed to update_sparsity_for_prefix");
strbuf_grow(&ce_prefix, prefix_len + 1);
strbuf_add(&ce_prefix, prefix, prefix_len);
strbuf_addch(&ce_prefix, '/');
/*
* If the prefix points to a sparse directory or a path inside a sparse
* directory, the index should be expanded. This is accomplished in one
* of two ways:
* - if the prefix is inside a sparse directory, it will be expanded by
* the 'ensure_full_index(...)' call in 'index_name_pos(...)'.
* - if the prefix matches an existing sparse directory entry,
* 'index_name_pos(...)' will return its index position, triggering
* the 'ensure_full_index(...)' below.
*/
if (!path_in_cone_mode_sparse_checkout(ce_prefix.buf, istate) &&
index_name_pos(istate, ce_prefix.buf, ce_prefix.len) >= 0)
ensure_full_index(istate);
strbuf_release(&ce_prefix);
}
static int verify_absent(const struct cache_entry *,
enum unpack_trees_error_types,
struct unpack_trees_options *);
/*
* N-way merge "len" trees. Returns 0 on success, -1 on failure to manipulate the
* resulting index, -2 on failure to reflect the changes to the work tree.
*
* CE_ADDED, CE_UNPACKED and CE_NEW_SKIP_WORKTREE are used internally
*/
int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options *o)
{
struct repository *repo = the_repository;
int i, ret;
static struct cache_entry *dfc;
struct pattern_list pl;
int free_pattern_list = 0;
struct dir_struct dir = DIR_INIT;
if (o->reset == UNPACK_RESET_INVALID)
BUG("o->reset had a value of 1; should be UNPACK_TREES_*_UNTRACKED");
if (len > MAX_UNPACK_TREES)
die("unpack_trees takes at most %d trees", MAX_UNPACK_TREES);
if (o->dir)
BUG("o->dir is for internal use only");
trace_performance_enter();
trace2_region_enter("unpack_trees", "unpack_trees", the_repository);
prepare_repo_settings(repo);
if (repo->settings.command_requires_full_index) {
ensure_full_index(o->src_index);
ensure_full_index(o->dst_index);
}
if (o->reset == UNPACK_RESET_OVERWRITE_UNTRACKED &&
o->preserve_ignored)
BUG("UNPACK_RESET_OVERWRITE_UNTRACKED incompatible with preserved ignored files");
if (!o->preserve_ignored) {
o->dir = &dir;
o->dir->flags |= DIR_SHOW_IGNORED;
setup_standard_excludes(o->dir);
}
if (o->prefix)
update_sparsity_for_prefix(o->prefix, o->src_index);
if (!core_apply_sparse_checkout || !o->update)
o->skip_sparse_checkout = 1;
if (!o->skip_sparse_checkout && !o->pl) {
memset(&pl, 0, sizeof(pl));
free_pattern_list = 1;
populate_from_existing_patterns(o, &pl);
}
memset(&o->result, 0, sizeof(o->result));
o->result.initialized = 1;
o->result.timestamp.sec = o->src_index->timestamp.sec;
o->result.timestamp.nsec = o->src_index->timestamp.nsec;
o->result.version = o->src_index->version;
if (!o->src_index->split_index) {
o->result.split_index = NULL;
} else if (o->src_index == o->dst_index) {
/*
* o->dst_index (and thus o->src_index) will be discarded
* and overwritten with o->result at the end of this function,
* so just use src_index's split_index to avoid having to
* create a new one.
*/
o->result.split_index = o->src_index->split_index;
o->result.split_index->refcount++;
} else {
o->result.split_index = init_split_index(&o->result);
}
oidcpy(&o->result.oid, &o->src_index->oid);
o->merge_size = len;
mark_all_ce_unused(o->src_index);
o->result.fsmonitor_last_update =
xstrdup_or_null(o->src_index->fsmonitor_last_update);
o->result.fsmonitor_has_run_once = o->src_index->fsmonitor_has_run_once;
if (!o->src_index->initialized &&
!repo->settings.command_requires_full_index &&
is_sparse_index_allowed(&o->result, 0))
o->result.sparse_index = 1;
/*
* Sparse checkout loop #1: set NEW_SKIP_WORKTREE on existing entries
*/
if (!o->skip_sparse_checkout)
mark_new_skip_worktree(o->pl, o->src_index, 0,
CE_NEW_SKIP_WORKTREE, o->verbose_update);
if (!dfc)
dfc = xcalloc(1, cache_entry_size(0));
o->df_conflict_entry = dfc;
if (len) {
const char *prefix = o->prefix ? o->prefix : "";
struct traverse_info info;
setup_traverse_info(&info, prefix);
info.fn = unpack_callback;
info.data = o;
info.show_all_errors = o->show_all_errors;
info.pathspec = o->pathspec;
if (o->prefix) {
/*
* Unpack existing index entries that sort before the
* prefix the tree is spliced into. Note that o->merge
* is always true in this case.
*/
while (1) {
struct cache_entry *ce = next_cache_entry(o);
if (!ce)
break;
if (ce_in_traverse_path(ce, &info))
break;
if (unpack_index_entry(ce, o) < 0)
goto return_failed;
}
}
trace_performance_enter();
trace2_region_enter("unpack_trees", "traverse_trees", the_repository);
ret = traverse_trees(o->src_index, len, t, &info);
trace2_region_leave("unpack_trees", "traverse_trees", the_repository);
trace_performance_leave("traverse_trees");
if (ret < 0)
goto return_failed;
}
/* Any left-over entries in the index? */
if (o->merge) {
while (1) {
struct cache_entry *ce = next_cache_entry(o);
if (!ce)
break;
if (unpack_index_entry(ce, o) < 0)
goto return_failed;
}
}
mark_all_ce_unused(o->src_index);
if (o->trivial_merges_only && o->nontrivial_merge) {
ret = unpack_failed(o, "Merge requires file-level merging");
goto done;
}
if (!o->skip_sparse_checkout) {
/*
* Sparse checkout loop #2: set NEW_SKIP_WORKTREE on entries not in loop #1
* If they will have NEW_SKIP_WORKTREE, also set CE_SKIP_WORKTREE
* so apply_sparse_checkout() won't attempt to remove it from worktree
*/
mark_new_skip_worktree(o->pl, &o->result,
CE_ADDED, CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE,
o->verbose_update);
ret = 0;
for (i = 0; i < o->result.cache_nr; i++) {
struct cache_entry *ce = o->result.cache[i];
/*
* Entries marked with CE_ADDED in merged_entry() do not have
* verify_absent() check (the check is effectively disabled
* because CE_NEW_SKIP_WORKTREE is set unconditionally).
*
* Do the real check now because we have had
* correct CE_NEW_SKIP_WORKTREE
*/
if (ce->ce_flags & CE_ADDED &&
verify_absent(ce, WARNING_SPARSE_ORPHANED_NOT_OVERWRITTEN, o))
ret = 1;
if (apply_sparse_checkout(&o->result, ce, o))
ret = 1;
}
if (ret == 1) {
/*
* Inability to sparsify or de-sparsify individual
* paths is not an error, but just a warning.
*/
if (o->show_all_errors)
display_warning_msgs(o);
ret = 0;
}
}
ret = check_updates(o, &o->result) ? (-2) : 0;
if (o->dst_index) {
move_index_extensions(&o->result, o->src_index);
if (!ret) {
if (git_env_bool("GIT_TEST_CHECK_CACHE_TREE", 0))
cache_tree_verify(the_repository, &o->result);
if (!o->skip_cache_tree_update &&
!cache_tree_fully_valid(o->result.cache_tree))
cache_tree_update(&o->result,
WRITE_TREE_SILENT |
WRITE_TREE_REPAIR);
}
o->result.updated_workdir = 1;
discard_index(o->dst_index);
*o->dst_index = o->result;
} else {
discard_index(&o->result);
}
o->src_index = NULL;
done:
if (free_pattern_list)
clear_pattern_list(&pl);
if (o->dir) {
dir_clear(o->dir);
o->dir = NULL;
}
trace2_region_leave("unpack_trees", "unpack_trees", the_repository);
trace_performance_leave("unpack_trees");
return ret;
return_failed:
if (o->show_all_errors)
display_error_msgs(o);
mark_all_ce_unused(o->src_index);
ret = unpack_failed(o, NULL);
if (o->exiting_early)
ret = 0;
goto done;
}
/*
* Update SKIP_WORKTREE bits according to sparsity patterns, and update
* working directory to match.
*
* CE_NEW_SKIP_WORKTREE is used internally.
*/
enum update_sparsity_result update_sparsity(struct unpack_trees_options *o)
{
enum update_sparsity_result ret = UPDATE_SPARSITY_SUCCESS;
struct pattern_list pl;
int i;
unsigned old_show_all_errors;
int free_pattern_list = 0;
old_show_all_errors = o->show_all_errors;
o->show_all_errors = 1;
/* Sanity checks */
if (!o->update || o->index_only || o->skip_sparse_checkout)
BUG("update_sparsity() is for reflecting sparsity patterns in working directory");
if (o->src_index != o->dst_index || o->fn)
BUG("update_sparsity() called wrong");
trace_performance_enter();
/* If we weren't given patterns, use the recorded ones */
if (!o->pl) {
memset(&pl, 0, sizeof(pl));
free_pattern_list = 1;
populate_from_existing_patterns(o, &pl);
if (o->skip_sparse_checkout)
goto skip_sparse_checkout;
}
/* Expand sparse directories as needed */
expand_index(o->src_index, o->pl);
/* Set NEW_SKIP_WORKTREE on existing entries. */
mark_all_ce_unused(o->src_index);
mark_new_skip_worktree(o->pl, o->src_index, 0,
CE_NEW_SKIP_WORKTREE, o->verbose_update);
/* Then loop over entries and update/remove as needed */
ret = UPDATE_SPARSITY_SUCCESS;
for (i = 0; i < o->src_index->cache_nr; i++) {
struct cache_entry *ce = o->src_index->cache[i];
if (ce_stage(ce)) {
/* -1 because for loop will increment by 1 */
i += warn_conflicted_path(o->src_index, i, o) - 1;
ret = UPDATE_SPARSITY_WARNINGS;
continue;
}
if (apply_sparse_checkout(o->src_index, ce, o))
ret = UPDATE_SPARSITY_WARNINGS;
}
skip_sparse_checkout:
if (check_updates(o, o->src_index))
ret = UPDATE_SPARSITY_WORKTREE_UPDATE_FAILURES;
display_warning_msgs(o);
o->show_all_errors = old_show_all_errors;
if (free_pattern_list)
clear_pattern_list(&pl);
trace_performance_leave("update_sparsity");
return ret;
}
/* Here come the merge functions */
static int reject_merge(const struct cache_entry *ce,
struct unpack_trees_options *o)
{
return add_rejected_path(o, ERROR_WOULD_OVERWRITE, ce->name);
}
static int same(const struct cache_entry *a, const struct cache_entry *b)
{
if (!!a != !!b)
return 0;
if (!a && !b)
return 1;
if ((a->ce_flags | b->ce_flags) & CE_CONFLICTED)
return 0;
return a->ce_mode == b->ce_mode &&
oideq(&a->oid, &b->oid);
}
/*
* When a CE gets turned into an unmerged entry, we
* want it to be up-to-date
*/
static int verify_uptodate_1(const struct cache_entry *ce,
struct unpack_trees_options *o,
enum unpack_trees_error_types error_type)
{
struct stat st;
if (o->index_only)
return 0;
/*
* CE_VALID and CE_SKIP_WORKTREE cheat, we better check again
* if this entry is truly up-to-date because this file may be
* overwritten.
*/
if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
; /* keep checking */
else if (o->reset || ce_uptodate(ce))
return 0;
if (!lstat(ce->name, &st)) {
int flags = CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE;
unsigned changed = ie_match_stat(o->src_index, ce, &st, flags);
if (submodule_from_ce(ce)) {
int r = check_submodule_move_head(ce,
"HEAD", oid_to_hex(&ce->oid), o);
if (r)
return add_rejected_path(o, error_type, ce->name);
return 0;
}
if (!changed)
return 0;
/*
* Historic default policy was to allow submodule to be out
* of sync wrt the superproject index. If the submodule was
* not considered interesting above, we don't care here.
*/
if (S_ISGITLINK(ce->ce_mode))
return 0;
errno = 0;
}
if (errno == ENOENT)
return 0;
return add_rejected_path(o, error_type, ce->name);
}
int verify_uptodate(const struct cache_entry *ce,
struct unpack_trees_options *o)
{
if (!o->skip_sparse_checkout &&
(ce->ce_flags & CE_SKIP_WORKTREE) &&
(ce->ce_flags & CE_NEW_SKIP_WORKTREE))
return 0;
return verify_uptodate_1(ce, o, ERROR_NOT_UPTODATE_FILE);
}
static int verify_uptodate_sparse(const struct cache_entry *ce,
struct unpack_trees_options *o)
{
return verify_uptodate_1(ce, o, WARNING_SPARSE_NOT_UPTODATE_FILE);
}
/*
* TODO: We should actually invalidate o->result, not src_index [1].
* But since cache tree and untracked cache both are not copied to
* o->result until unpacking is complete, we invalidate them on
* src_index instead with the assumption that they will be copied to
* dst_index at the end.
*
* [1] src_index->cache_tree is also used in unpack_callback() so if
* we invalidate o->result, we need to update it to use
* o->result.cache_tree as well.
*/
static void invalidate_ce_path(const struct cache_entry *ce,
struct unpack_trees_options *o)
{
if (!ce)
return;
cache_tree_invalidate_path(o->src_index, ce->name);
untracked_cache_invalidate_path(o->src_index, ce->name, 1);
}
/*
* Check that checking out ce->sha1 in subdir ce->name is not
* going to overwrite any working files.
*/
static int verify_clean_submodule(const char *old_sha1,
const struct cache_entry *ce,
struct unpack_trees_options *o)
{
if (!submodule_from_ce(ce))
return 0;
return check_submodule_move_head(ce, old_sha1,
oid_to_hex(&ce->oid), o);
}
static int verify_clean_subdirectory(const struct cache_entry *ce,
struct unpack_trees_options *o)
{
/*
* we are about to extract "ce->name"; we would not want to lose
* anything in the existing directory there.
*/
int namelen;
int i;
struct dir_struct d;
char *pathbuf;
int cnt = 0;
if (S_ISGITLINK(ce->ce_mode)) {
struct object_id oid;
int sub_head = resolve_gitlink_ref(ce->name, "HEAD", &oid);
/*
* If we are not going to update the submodule, then
* we don't care.
*/
if (!sub_head && oideq(&oid, &ce->oid))
return 0;
return verify_clean_submodule(sub_head ? NULL : oid_to_hex(&oid),
ce, o);
}
/*
* First let's make sure we do not have a local modification
* in that directory.
*/
namelen = ce_namelen(ce);
for (i = locate_in_src_index(ce, o);
i < o->src_index->cache_nr;
i++) {
struct cache_entry *ce2 = o->src_index->cache[i];
int len = ce_namelen(ce2);
if (len < namelen ||
strncmp(ce->name, ce2->name, namelen) ||
ce2->name[namelen] != '/')
break;
/*
* ce2->name is an entry in the subdirectory to be
* removed.
*/
if (!ce_stage(ce2)) {
if (verify_uptodate(ce2, o))
return -1;
add_entry(o, ce2, CE_REMOVE, 0);
invalidate_ce_path(ce, o);
mark_ce_used(ce2, o);
}
cnt++;
}
/* Do not lose a locally present file that is not ignored. */
pathbuf = xstrfmt("%.*s/", namelen, ce->name);
memset(&d, 0, sizeof(d));
if (o->dir)
d.exclude_per_dir = o->dir->exclude_per_dir;
i = read_directory(&d, o->src_index, pathbuf, namelen+1, NULL);
dir_clear(&d);
free(pathbuf);
if (i)
return add_rejected_path(o, ERROR_NOT_UPTODATE_DIR, ce->name);
/* Do not lose startup_info->original_cwd */
if (startup_info->original_cwd &&
!strcmp(startup_info->original_cwd, ce->name))
return add_rejected_path(o, ERROR_CWD_IN_THE_WAY, ce->name);
return cnt;
}
/*
* This gets called when there was no index entry for the tree entry 'dst',
* but we found a file in the working tree that 'lstat()' said was fine,
* and we're on a case-insensitive filesystem.
*
* See if we can find a case-insensitive match in the index that also
* matches the stat information, and assume it's that other file!
*/
static int icase_exists(struct unpack_trees_options *o, const char *name, int len, struct stat *st)
{
const struct cache_entry *src;
src = index_file_exists(o->src_index, name, len, 1);
return src && !ie_match_stat(o->src_index, src, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
}
enum absent_checking_type {
COMPLETELY_ABSENT,
ABSENT_ANY_DIRECTORY
};
static int check_ok_to_remove(const char *name, int len, int dtype,
const struct cache_entry *ce, struct stat *st,
enum unpack_trees_error_types error_type,
enum absent_checking_type absent_type,
struct unpack_trees_options *o)
{
const struct cache_entry *result;
/*
* It may be that the 'lstat()' succeeded even though
* target 'ce' was absent, because there is an old
* entry that is different only in case..
*
* Ignore that lstat() if it matches.
*/
if (ignore_case && icase_exists(o, name, len, st))
return 0;
if (o->dir &&
is_excluded(o->dir, o->src_index, name, &dtype))
/*
* ce->name is explicitly excluded, so it is Ok to
* overwrite it.
*/
return 0;
if (S_ISDIR(st->st_mode)) {
/*
* We are checking out path "foo" and
* found "foo/." in the working tree.
* This is tricky -- if we have modified
* files that are in "foo/" we would lose
* them.
*/
if (verify_clean_subdirectory(ce, o) < 0)
return -1;
return 0;
}
/* If we only care about directories, then we can remove */
if (absent_type == ABSENT_ANY_DIRECTORY)
return 0;
/*
* The previous round may already have decided to
* delete this path, which is in a subdirectory that
* is being replaced with a blob.
*/
result = index_file_exists(&o->result, name, len, 0);
if (result) {
if (result->ce_flags & CE_REMOVE)
return 0;
}
return add_rejected_path(o, error_type, name);
}
/*
* We do not want to remove or overwrite a working tree file that
* is not tracked, unless it is ignored.
*/
static int verify_absent_1(const struct cache_entry *ce,
enum unpack_trees_error_types error_type,
enum absent_checking_type absent_type,
struct unpack_trees_options *o)
{
int len;
struct stat st;
if (o->index_only || !o->update)
return 0;
if (o->reset == UNPACK_RESET_OVERWRITE_UNTRACKED) {
/* Avoid nuking startup_info->original_cwd... */
if (startup_info->original_cwd &&
!strcmp(startup_info->original_cwd, ce->name))
return add_rejected_path(o, ERROR_CWD_IN_THE_WAY,
ce->name);
/* ...but nuke anything else. */
return 0;
}
len = check_leading_path(ce->name, ce_namelen(ce), 0);
if (!len)
return 0;
else if (len > 0) {
char *path;
int ret;
path = xmemdupz(ce->name, len);
if (lstat(path, &st))
ret = error_errno("cannot stat '%s'", path);
else {
if (submodule_from_ce(ce))
ret = check_submodule_move_head(ce,
oid_to_hex(&ce->oid),
NULL, o);
else
ret = check_ok_to_remove(path, len, DT_UNKNOWN, NULL,
&st, error_type,
absent_type, o);
}
free(path);
return ret;
} else if (lstat(ce->name, &st)) {
if (errno != ENOENT)
return error_errno("cannot stat '%s'", ce->name);
return 0;
} else {
if (submodule_from_ce(ce))
return check_submodule_move_head(ce, oid_to_hex(&ce->oid),
NULL, o);
return check_ok_to_remove(ce->name, ce_namelen(ce),
ce_to_dtype(ce), ce, &st,
error_type, absent_type, o);
}
}
static int verify_absent(const struct cache_entry *ce,
enum unpack_trees_error_types error_type,
struct unpack_trees_options *o)
{
if (!o->skip_sparse_checkout && (ce->ce_flags & CE_NEW_SKIP_WORKTREE))
return 0;
return verify_absent_1(ce, error_type, COMPLETELY_ABSENT, o);
}
static int verify_absent_if_directory(const struct cache_entry *ce,
enum unpack_trees_error_types error_type,
struct unpack_trees_options *o)
{
if (!o->skip_sparse_checkout && (ce->ce_flags & CE_NEW_SKIP_WORKTREE))
return 0;
return verify_absent_1(ce, error_type, ABSENT_ANY_DIRECTORY, o);
}
static int verify_absent_sparse(const struct cache_entry *ce,
enum unpack_trees_error_types error_type,
struct unpack_trees_options *o)
{
return verify_absent_1(ce, error_type, COMPLETELY_ABSENT, o);
}
static int merged_entry(const struct cache_entry *ce,
const struct cache_entry *old,
struct unpack_trees_options *o)
{
int update = CE_UPDATE;
struct cache_entry *merge = dup_cache_entry(ce, &o->result);
if (!old) {
/*
* New index entries. In sparse checkout, the following
* verify_absent() will be delayed until after
* traverse_trees() finishes in unpack_trees(), then:
*
* - CE_NEW_SKIP_WORKTREE will be computed correctly
* - verify_absent() be called again, this time with
* correct CE_NEW_SKIP_WORKTREE
*
* verify_absent() call here does nothing in sparse
* checkout (i.e. o->skip_sparse_checkout == 0)
*/
update |= CE_ADDED;
merge->ce_flags |= CE_NEW_SKIP_WORKTREE;
if (verify_absent(merge,
ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN, o)) {
discard_cache_entry(merge);
return -1;
}
invalidate_ce_path(merge, o);
if (submodule_from_ce(ce) && file_exists(ce->name)) {
int ret = check_submodule_move_head(ce, NULL,
oid_to_hex(&ce->oid),
o);
if (ret)
return ret;
}
} else if (!(old->ce_flags & CE_CONFLICTED)) {
/*
* See if we can re-use the old CE directly?
* That way we get the uptodate stat info.
*
* This also removes the UPDATE flag on a match; otherwise
* we will end up overwriting local changes in the work tree.
*/
if (same(old, merge)) {
copy_cache_entry(merge, old);
update = 0;
} else {
if (verify_uptodate(old, o)) {
discard_cache_entry(merge);
return -1;
}
/* Migrate old flags over */
update |= old->ce_flags & (CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE);
invalidate_ce_path(old, o);
}
if (submodule_from_ce(ce) && file_exists(ce->name)) {
int ret = check_submodule_move_head(ce, oid_to_hex(&old->oid),
oid_to_hex(&ce->oid),
o);
if (ret)
return ret;
}
} else {
/*
* Previously unmerged entry left as an existence
* marker by read_index_unmerged();
*/
if (verify_absent_if_directory(merge,
ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN, o)) {
discard_cache_entry(merge);
return -1;
}
invalidate_ce_path(old, o);
}
if (do_add_entry(o, merge, update, CE_STAGEMASK) < 0)
return -1;
return 1;
}
static int merged_sparse_dir(const struct cache_entry * const *src, int n,
struct unpack_trees_options *o)
{
struct tree_desc t[MAX_UNPACK_TREES + 1];
void * tree_bufs[MAX_UNPACK_TREES + 1];
struct traverse_info info;
int i, ret;
/*
* Create the tree traversal information for traversing into *only* the
* sparse directory.
*/
setup_traverse_info(&info, src[0]->name);
info.fn = unpack_sparse_callback;
info.data = o;
info.show_all_errors = o->show_all_errors;
info.pathspec = o->pathspec;
/* Get the tree descriptors of the sparse directory in each of the merging trees */
for (i = 0; i < n; i++)
tree_bufs[i] = fill_tree_descriptor(o->src_index->repo, &t[i],
src[i] && !is_null_oid(&src[i]->oid) ? &src[i]->oid : NULL);
ret = traverse_trees(o->src_index, n, t, &info);
for (i = 0; i < n; i++)
free(tree_bufs[i]);
return ret;
}
static int deleted_entry(const struct cache_entry *ce,
const struct cache_entry *old,
struct unpack_trees_options *o)
{
/* Did it exist in the index? */
if (!old) {
if (verify_absent(ce, ERROR_WOULD_LOSE_UNTRACKED_REMOVED, o))
return -1;
return 0;
} else if (verify_absent_if_directory(ce, ERROR_WOULD_LOSE_UNTRACKED_REMOVED, o)) {
return -1;
}
if (!(old->ce_flags & CE_CONFLICTED) && verify_uptodate(old, o))
return -1;
add_entry(o, ce, CE_REMOVE, 0);
invalidate_ce_path(ce, o);
return 1;
}
static int keep_entry(const struct cache_entry *ce,
struct unpack_trees_options *o)
{
add_entry(o, ce, 0, 0);
if (ce_stage(ce))
invalidate_ce_path(ce, o);
return 1;
}
#if DBRT_DEBUG
static void show_stage_entry(FILE *o,
const char *label, const struct cache_entry *ce)
{
if (!ce)
fprintf(o, "%s (missing)\n", label);
else
fprintf(o, "%s%06o %s %d\t%s\n",
label,
ce->ce_mode,
oid_to_hex(&ce->oid),
ce_stage(ce),
ce->name);
}
#endif
int threeway_merge(const struct cache_entry * const *stages,
struct unpack_trees_options *o)
{
const struct cache_entry *index;
const struct cache_entry *head;
const struct cache_entry *remote = stages[o->head_idx + 1];
int count;
int head_match = 0;
int remote_match = 0;
int df_conflict_head = 0;
int df_conflict_remote = 0;
int any_anc_missing = 0;
int no_anc_exists = 1;
int i;
for (i = 1; i < o->head_idx; i++) {
if (!stages[i] || stages[i] == o->df_conflict_entry)
any_anc_missing = 1;
else
no_anc_exists = 0;
}
index = stages[0];
head = stages[o->head_idx];
if (head == o->df_conflict_entry) {
df_conflict_head = 1;
head = NULL;
}
if (remote == o->df_conflict_entry) {
df_conflict_remote = 1;
remote = NULL;
}
/*
* First, if there's a #16 situation, note that to prevent #13
* and #14.
*/
if (!same(remote, head)) {
for (i = 1; i < o->head_idx; i++) {
if (same(stages[i], head)) {
head_match = i;
}
if (same(stages[i], remote)) {
remote_match = i;
}
}
}
/*
* We start with cases where the index is allowed to match
* something other than the head: #14(ALT) and #2ALT, where it
* is permitted to match the result instead.
*/
/* #14, #14ALT, #2ALT */
if (remote && !df_conflict_head && head_match && !remote_match) {
if (index && !same(index, remote) && !same(index, head)) {
if (S_ISSPARSEDIR(index->ce_mode))
return merged_sparse_dir(stages, 4, o);
else
return reject_merge(index, o);
}
return merged_entry(remote, index, o);
}
/*
* If we have an entry in the index cache, then we want to
* make sure that it matches head.
*/
if (index && !same(index, head)) {
if (S_ISSPARSEDIR(index->ce_mode))
return merged_sparse_dir(stages, 4, o);
else
return reject_merge(index, o);
}
if (head) {
/* #5ALT, #15 */
if (same(head, remote))
return merged_entry(head, index, o);
/* #13, #3ALT */
if (!df_conflict_remote && remote_match && !head_match)
return merged_entry(head, index, o);
}
/* #1 */
if (!head && !remote && any_anc_missing)
return 0;
/*
* Under the "aggressive" rule, we resolve mostly trivial
* cases that we historically had git-merge-one-file resolve.
*/
if (o->aggressive) {
int head_deleted = !head;
int remote_deleted = !remote;
const struct cache_entry *ce = NULL;
if (index)
ce = index;
else if (head)
ce = head;
else if (remote)
ce = remote;
else {
for (i = 1; i < o->head_idx; i++) {
if (stages[i] && stages[i] != o->df_conflict_entry) {
ce = stages[i];
break;
}
}
}
/*
* Deleted in both.
* Deleted in one and unchanged in the other.
*/
if ((head_deleted && remote_deleted) ||
(head_deleted && remote && remote_match) ||
(remote_deleted && head && head_match)) {
if (index)
return deleted_entry(index, index, o);
if (ce && !head_deleted) {
if (verify_absent(ce, ERROR_WOULD_LOSE_UNTRACKED_REMOVED, o))
return -1;
}
return 0;
}
/*
* Added in both, identically.
*/
if (no_anc_exists && head && remote && same(head, remote))
return merged_entry(head, index, o);
}
/* Handle "no merge" cases (see t/t1000-read-tree-m-3way.sh) */
if (index) {
/*
* If we've reached the "no merge" cases and we're merging
* a sparse directory, we may have an "edit/edit" conflict that
* can be resolved by individually merging directory contents.
*/
if (S_ISSPARSEDIR(index->ce_mode))
return merged_sparse_dir(stages, 4, o);
/*
* If we're not merging a sparse directory, ensure the index is
* up-to-date to avoid files getting overwritten with conflict
* resolution files
*/
if (verify_uptodate(index, o))
return -1;
}
o->nontrivial_merge = 1;
/* #2, #3, #4, #6, #7, #9, #10, #11. */
count = 0;
if (!head_match || !remote_match) {
for (i = 1; i < o->head_idx; i++) {
if (stages[i] && stages[i] != o->df_conflict_entry) {
keep_entry(stages[i], o);
count++;
break;
}
}
}
#if DBRT_DEBUG
else {
fprintf(stderr, "read-tree: warning #16 detected\n");
show_stage_entry(stderr, "head ", stages[head_match]);
show_stage_entry(stderr, "remote ", stages[remote_match]);
}
#endif
if (head) { count += keep_entry(head, o); }
if (remote) { count += keep_entry(remote, o); }
return count;
}
/*
* Two-way merge.
*
* The rule is to "carry forward" what is in the index without losing
* information across a "fast-forward", favoring a successful merge
* over a merge failure when it makes sense. For details of the
* "carry forward" rule, please see <Documentation/git-read-tree.txt>.
*
*/
int twoway_merge(const struct cache_entry * const *src,
struct unpack_trees_options *o)
{
const struct cache_entry *current = src[0];
const struct cache_entry *oldtree = src[1];
const struct cache_entry *newtree = src[2];
if (o->merge_size != 2)
return error("Cannot do a twoway merge of %d trees",
o->merge_size);
if (oldtree == o->df_conflict_entry)
oldtree = NULL;
if (newtree == o->df_conflict_entry)
newtree = NULL;
if (current) {
if (current->ce_flags & CE_CONFLICTED) {
if (same(oldtree, newtree) || o->reset) {
if (!newtree)
return deleted_entry(current, current, o);
else
return merged_entry(newtree, current, o);
}
return reject_merge(current, o);
} else if ((!oldtree && !newtree) || /* 4 and 5 */
(!oldtree && newtree &&
same(current, newtree)) || /* 6 and 7 */
(oldtree && newtree &&
same(oldtree, newtree)) || /* 14 and 15 */
(oldtree && newtree &&
!same(oldtree, newtree) && /* 18 and 19 */
same(current, newtree))) {
return keep_entry(current, o);
} else if (oldtree && !newtree && same(current, oldtree)) {
/* 10 or 11 */
return deleted_entry(oldtree, current, o);
} else if (oldtree && newtree &&
same(current, oldtree) && !same(current, newtree)) {
/* 20 or 21 */
return merged_entry(newtree, current, o);
} else if (current && !oldtree && newtree &&
S_ISSPARSEDIR(current->ce_mode) != S_ISSPARSEDIR(newtree->ce_mode) &&
ce_stage(current) == 0) {
/*
* This case is a directory/file conflict across the sparse-index
* boundary. When we are changing from one path to another via
* 'git checkout', then we want to replace one entry with another
* via merged_entry(). If there are staged changes, then we should
* reject the merge instead.
*/
return merged_entry(newtree, current, o);
} else if (S_ISSPARSEDIR(current->ce_mode)) {
/*
* The sparse directories differ, but we don't know whether that's
* because of two different files in the directory being modified
* (can be trivially merged) or if there is a real file conflict.
* Merge the sparse directory by OID to compare file-by-file.
*/
return merged_sparse_dir(src, 3, o);
} else
return reject_merge(current, o);
}
else if (newtree) {
if (oldtree && !o->initial_checkout) {
/*
* deletion of the path was staged;
*/
if (same(oldtree, newtree))
return 1;
return reject_merge(oldtree, o);
}
return merged_entry(newtree, current, o);
}
return deleted_entry(oldtree, current, o);
}
/*
* Bind merge.
*
* Keep the index entries at stage0, collapse stage1 but make sure
* stage0 does not have anything there.
*/
int bind_merge(const struct cache_entry * const *src,
struct unpack_trees_options *o)
{
const struct cache_entry *old = src[0];
const struct cache_entry *a = src[1];
if (o->merge_size != 1)
return error("Cannot do a bind merge of %d trees",
o->merge_size);
if (a && old)
return o->quiet ? -1 :
error(ERRORMSG(o, ERROR_BIND_OVERLAP),
super_prefixed(a->name),
super_prefixed(old->name));
if (!a)
return keep_entry(old, o);
else
return merged_entry(a, NULL, o);
}
/*
* One-way merge.
*
* The rule is:
* - take the stat information from stage0, take the data from stage1
*/
int oneway_merge(const struct cache_entry * const *src,
struct unpack_trees_options *o)
{
const struct cache_entry *old = src[0];
const struct cache_entry *a = src[1];
if (o->merge_size != 1)
return error("Cannot do a oneway merge of %d trees",
o->merge_size);
if (!a || a == o->df_conflict_entry)
return deleted_entry(old, old, o);
if (old && same(old, a)) {
int update = 0;
if (o->reset && o->update && !ce_uptodate(old) && !ce_skip_worktree(old) &&
!(old->ce_flags & CE_FSMONITOR_VALID)) {
struct stat st;
if (lstat(old->name, &st) ||
ie_match_stat(o->src_index, old, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE))
update |= CE_UPDATE;
}
if (o->update && S_ISGITLINK(old->ce_mode) &&
should_update_submodules() && !verify_uptodate(old, o))
update |= CE_UPDATE;
add_entry(o, old, update, CE_STAGEMASK);
return 0;
}
return merged_entry(a, old, o);
}
/*
* Merge worktree and untracked entries in a stash entry.
*
* Ignore all index entries. Collapse remaining trees but make sure that they
* don't have any conflicting files.
*/
int stash_worktree_untracked_merge(const struct cache_entry * const *src,
struct unpack_trees_options *o)
{
const struct cache_entry *worktree = src[1];
const struct cache_entry *untracked = src[2];
if (o->merge_size != 2)
BUG("invalid merge_size: %d", o->merge_size);
if (worktree && untracked)
return error(_("worktree and untracked commit have duplicate entries: %s"),
super_prefixed(worktree->name));
return merged_entry(worktree ? worktree : untracked, NULL, o);
}
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