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git/rev-list.c
Linus Torvalds 19a7e7151d git-rev-list: do not forget non-commit refs 
What happens is that the new logic decides that if it can't look up a
commit reference (ie "get_commit_reference()" returns NULL), the thing
must be a pathname.

Fair enough.

But wrong.

The thing is, it may be a perfectly fine ref that _isn't_ a commit. In
git, you have a tag that points to your PGP key, and in the kernel, I have
a tag that points to a tree (and a direct ref that points to that tree
too, for that matter).

So the rule is (as for all the other programs that mix revs and pathnames)
not that we only accept commit references, but _any_ valid object ref.

If the object then isn't a commit ref, git-rev-list will either ignore it,
or add it to the list of non-commit objects (if using "--objects").

The solution is to move the "get_sha1()" out of get_commit_reference(),
and into the callers. In fact, we already _have_ the SHA1 in the case of
the handle_all() loop, since for_each_ref() will have done it for us, so
this is the correct thing to do anyway.

This patch (on top of the original one) does exactly that.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-10-26 16:49:38 -07:00

876 lines
20 KiB
C
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#include "cache.h"
#include "refs.h"
#include "tag.h"
#include "commit.h"
#include "tree.h"
#include "blob.h"
#include "epoch.h"
#include "diff.h"
#define SEEN (1u << 0)
#define INTERESTING (1u << 1)
#define COUNTED (1u << 2)
#define SHOWN (1u << 3)
#define TREECHANGE (1u << 4)
static const char rev_list_usage[] =
"git-rev-list [OPTION] commit-id <commit-id>\n"
" --max-count=nr\n"
" --max-age=epoch\n"
" --min-age=epoch\n"
" --parents\n"
" --bisect\n"
" --objects\n"
" --unpacked\n"
" --header\n"
" --pretty\n"
" --no-merges\n"
" --merge-order [ --show-breaks ]\n"
" --topo-order";
static int dense = 1;
static int unpacked = 0;
static int bisect_list = 0;
static int tag_objects = 0;
static int tree_objects = 0;
static int blob_objects = 0;
static int verbose_header = 0;
static int show_parents = 0;
static int hdr_termination = 0;
static const char *commit_prefix = "";
static unsigned long max_age = -1;
static unsigned long min_age = -1;
static int max_count = -1;
static enum cmit_fmt commit_format = CMIT_FMT_RAW;
static int merge_order = 0;
static int show_breaks = 0;
static int stop_traversal = 0;
static int topo_order = 0;
static int no_merges = 0;
static const char **paths = NULL;
static void show_commit(struct commit *commit)
{
commit->object.flags |= SHOWN;
if (show_breaks) {
commit_prefix = "| ";
if (commit->object.flags & DISCONTINUITY) {
commit_prefix = "^ ";
} else if (commit->object.flags & BOUNDARY) {
commit_prefix = "= ";
}
}
printf("%s%s", commit_prefix, sha1_to_hex(commit->object.sha1));
if (show_parents) {
struct commit_list *parents = commit->parents;
while (parents) {
printf(" %s", sha1_to_hex(parents->item->object.sha1));
parents = parents->next;
}
}
if (commit_format == CMIT_FMT_ONELINE)
putchar(' ');
else
putchar('\n');
if (verbose_header) {
static char pretty_header[16384];
pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
printf("%s%c", pretty_header, hdr_termination);
}
fflush(stdout);
}
static int rewrite_one(struct commit **pp)
{
for (;;) {
struct commit *p = *pp;
if (p->object.flags & (TREECHANGE | UNINTERESTING))
return 0;
if (!p->parents)
return -1;
*pp = p->parents->item;
}
}
static void rewrite_parents(struct commit *commit)
{
struct commit_list **pp = &commit->parents;
while (*pp) {
struct commit_list *parent = *pp;
if (rewrite_one(&parent->item) < 0) {
*pp = parent->next;
continue;
}
pp = &parent->next;
}
}
static int filter_commit(struct commit * commit)
{
if (stop_traversal && (commit->object.flags & BOUNDARY))
return STOP;
if (commit->object.flags & (UNINTERESTING|SHOWN))
return CONTINUE;
if (min_age != -1 && (commit->date > min_age))
return CONTINUE;
if (max_age != -1 && (commit->date < max_age)) {
stop_traversal=1;
return CONTINUE;
}
if (max_count != -1 && !max_count--)
return STOP;
if (no_merges && (commit->parents && commit->parents->next))
return CONTINUE;
if (paths && dense) {
if (!(commit->object.flags & TREECHANGE))
return CONTINUE;
rewrite_parents(commit);
}
return DO;
}
static int process_commit(struct commit * commit)
{
int action=filter_commit(commit);
if (action == STOP) {
return STOP;
}
if (action == CONTINUE) {
return CONTINUE;
}
show_commit(commit);
return CONTINUE;
}
static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
{
struct object_list *entry = xmalloc(sizeof(*entry));
entry->item = obj;
entry->next = *p;
entry->name = name;
*p = entry;
return &entry->next;
}
static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
{
struct object *obj = &blob->object;
if (!blob_objects)
return p;
if (obj->flags & (UNINTERESTING | SEEN))
return p;
obj->flags |= SEEN;
return add_object(obj, p, name);
}
static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
{
struct object *obj = &tree->object;
struct tree_entry_list *entry;
if (!tree_objects)
return p;
if (obj->flags & (UNINTERESTING | SEEN))
return p;
if (parse_tree(tree) < 0)
die("bad tree object %s", sha1_to_hex(obj->sha1));
obj->flags |= SEEN;
p = add_object(obj, p, name);
entry = tree->entries;
tree->entries = NULL;
while (entry) {
struct tree_entry_list *next = entry->next;
if (entry->directory)
p = process_tree(entry->item.tree, p, entry->name);
else
p = process_blob(entry->item.blob, p, entry->name);
free(entry);
entry = next;
}
return p;
}
static struct object_list *pending_objects = NULL;
static void show_commit_list(struct commit_list *list)
{
struct object_list *objects = NULL, **p = &objects, *pending;
while (list) {
struct commit *commit = pop_most_recent_commit(&list, SEEN);
p = process_tree(commit->tree, p, "");
if (process_commit(commit) == STOP)
break;
}
for (pending = pending_objects; pending; pending = pending->next) {
struct object *obj = pending->item;
const char *name = pending->name;
if (obj->flags & (UNINTERESTING | SEEN))
continue;
if (obj->type == tag_type) {
obj->flags |= SEEN;
p = add_object(obj, p, name);
continue;
}
if (obj->type == tree_type) {
p = process_tree((struct tree *)obj, p, name);
continue;
}
if (obj->type == blob_type) {
p = process_blob((struct blob *)obj, p, name);
continue;
}
die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
}
while (objects) {
/* An object with name "foo\n0000000000000000000000000000000000000000"
* can be used confuse downstream git-pack-objects very badly.
*/
const char *ep = strchr(objects->name, '\n');
if (ep) {
printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
(int) (ep - objects->name),
objects->name);
}
else
printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
objects = objects->next;
}
}
static void mark_blob_uninteresting(struct blob *blob)
{
if (!blob_objects)
return;
if (blob->object.flags & UNINTERESTING)
return;
blob->object.flags |= UNINTERESTING;
}
static void mark_tree_uninteresting(struct tree *tree)
{
struct object *obj = &tree->object;
struct tree_entry_list *entry;
if (!tree_objects)
return;
if (obj->flags & UNINTERESTING)
return;
obj->flags |= UNINTERESTING;
if (!has_sha1_file(obj->sha1))
return;
if (parse_tree(tree) < 0)
die("bad tree %s", sha1_to_hex(obj->sha1));
entry = tree->entries;
tree->entries = NULL;
while (entry) {
struct tree_entry_list *next = entry->next;
if (entry->directory)
mark_tree_uninteresting(entry->item.tree);
else
mark_blob_uninteresting(entry->item.blob);
free(entry);
entry = next;
}
}
static void mark_parents_uninteresting(struct commit *commit)
{
struct commit_list *parents = commit->parents;
while (parents) {
struct commit *commit = parents->item;
commit->object.flags |= UNINTERESTING;
/*
* Normally we haven't parsed the parent
* yet, so we won't have a parent of a parent
* here. However, it may turn out that we've
* reached this commit some other way (where it
* wasn't uninteresting), in which case we need
* to mark its parents recursively too..
*/
if (commit->parents)
mark_parents_uninteresting(commit);
/*
* A missing commit is ok iff its parent is marked
* uninteresting.
*
* We just mark such a thing parsed, so that when
* it is popped next time around, we won't be trying
* to parse it and get an error.
*/
if (!has_sha1_file(commit->object.sha1))
commit->object.parsed = 1;
parents = parents->next;
}
}
static int everybody_uninteresting(struct commit_list *orig)
{
struct commit_list *list = orig;
while (list) {
struct commit *commit = list->item;
list = list->next;
if (commit->object.flags & UNINTERESTING)
continue;
return 0;
}
return 1;
}
/*
* This is a truly stupid algorithm, but it's only
* used for bisection, and we just don't care enough.
*
* We care just barely enough to avoid recursing for
* non-merge entries.
*/
static int count_distance(struct commit_list *entry)
{
int nr = 0;
while (entry) {
struct commit *commit = entry->item;
struct commit_list *p;
if (commit->object.flags & (UNINTERESTING | COUNTED))
break;
nr++;
commit->object.flags |= COUNTED;
p = commit->parents;
entry = p;
if (p) {
p = p->next;
while (p) {
nr += count_distance(p);
p = p->next;
}
}
}
return nr;
}
static void clear_distance(struct commit_list *list)
{
while (list) {
struct commit *commit = list->item;
commit->object.flags &= ~COUNTED;
list = list->next;
}
}
static struct commit_list *find_bisection(struct commit_list *list)
{
int nr, closest;
struct commit_list *p, *best;
nr = 0;
p = list;
while (p) {
nr++;
p = p->next;
}
closest = 0;
best = list;
p = list;
while (p) {
int distance = count_distance(p);
clear_distance(list);
if (nr - distance < distance)
distance = nr - distance;
if (distance > closest) {
best = p;
closest = distance;
}
p = p->next;
}
if (best)
best->next = NULL;
return best;
}
static void mark_edges_uninteresting(struct commit_list *list)
{
for ( ; list; list = list->next) {
struct commit_list *parents = list->item->parents;
for ( ; parents; parents = parents->next) {
struct commit *commit = parents->item;
if (commit->object.flags & UNINTERESTING)
mark_tree_uninteresting(commit->tree);
}
}
}
static int is_different = 0;
static void file_add_remove(struct diff_options *options,
int addremove, unsigned mode,
const unsigned char *sha1,
const char *base, const char *path)
{
is_different = 1;
}
static void file_change(struct diff_options *options,
unsigned old_mode, unsigned new_mode,
const unsigned char *old_sha1,
const unsigned char *new_sha1,
const char *base, const char *path)
{
is_different = 1;
}
static struct diff_options diff_opt = {
.recursive = 1,
.add_remove = file_add_remove,
.change = file_change,
};
static int same_tree(struct tree *t1, struct tree *t2)
{
is_different = 0;
if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "", &diff_opt) < 0)
return 0;
return !is_different;
}
static int same_tree_as_empty(struct tree *t1)
{
int retval;
void *tree;
struct tree_desc empty, real;
if (!t1)
return 0;
tree = read_object_with_reference(t1->object.sha1, "tree", &real.size, NULL);
if (!tree)
return 0;
real.buf = tree;
empty.buf = "";
empty.size = 0;
is_different = 0;
retval = diff_tree(&empty, &real, "", &diff_opt);
free(tree);
return retval >= 0 && !is_different;
}
static struct commit *try_to_simplify_merge(struct commit *commit, struct commit_list *parent)
{
if (!commit->tree)
return NULL;
while (parent) {
struct commit *p = parent->item;
parent = parent->next;
parse_commit(p);
if (!p->tree)
continue;
if (same_tree(commit->tree, p->tree))
return p;
}
return NULL;
}
static void add_parents_to_list(struct commit *commit, struct commit_list **list)
{
struct commit_list *parent = commit->parents;
/*
* If the commit is uninteresting, don't try to
* prune parents - we want the maximal uninteresting
* set.
*
* Normally we haven't parsed the parent
* yet, so we won't have a parent of a parent
* here. However, it may turn out that we've
* reached this commit some other way (where it
* wasn't uninteresting), in which case we need
* to mark its parents recursively too..
*/
if (commit->object.flags & UNINTERESTING) {
while (parent) {
struct commit *p = parent->item;
parent = parent->next;
parse_commit(p);
p->object.flags |= UNINTERESTING;
if (p->parents)
mark_parents_uninteresting(p);
if (p->object.flags & SEEN)
continue;
p->object.flags |= SEEN;
insert_by_date(p, list);
}
return;
}
/*
* Ok, the commit wasn't uninteresting. If it
* is a merge, try to find the parent that has
* no differences in the path set if one exists.
*/
if (paths && parent && parent->next) {
struct commit *preferred;
preferred = try_to_simplify_merge(commit, parent);
if (preferred) {
parent->item = preferred;
parent->next = NULL;
}
}
while (parent) {
struct commit *p = parent->item;
parent = parent->next;
parse_commit(p);
if (p->object.flags & SEEN)
continue;
p->object.flags |= SEEN;
insert_by_date(p, list);
}
}
static void compress_list(struct commit_list *list)
{
while (list) {
struct commit *commit = list->item;
struct commit_list *parent = commit->parents;
list = list->next;
if (!parent) {
if (!same_tree_as_empty(commit->tree))
commit->object.flags |= TREECHANGE;
continue;
}
/*
* Exactly one parent? Check if it leaves the tree
* unchanged
*/
if (!parent->next) {
struct tree *t1 = commit->tree;
struct tree *t2 = parent->item->tree;
if (!t1 || !t2 || same_tree(t1, t2))
continue;
}
commit->object.flags |= TREECHANGE;
}
}
static struct commit_list *limit_list(struct commit_list *list)
{
struct commit_list *newlist = NULL;
struct commit_list **p = &newlist;
while (list) {
struct commit_list *entry = list;
struct commit *commit = list->item;
struct object *obj = &commit->object;
list = list->next;
free(entry);
if (max_age != -1 && (commit->date < max_age))
obj->flags |= UNINTERESTING;
if (unpacked && has_sha1_pack(obj->sha1))
obj->flags |= UNINTERESTING;
add_parents_to_list(commit, &list);
if (obj->flags & UNINTERESTING) {
mark_parents_uninteresting(commit);
if (everybody_uninteresting(list))
break;
continue;
}
if (min_age != -1 && (commit->date > min_age))
continue;
p = &commit_list_insert(commit, p)->next;
}
if (tree_objects)
mark_edges_uninteresting(newlist);
if (paths && dense)
compress_list(newlist);
if (bisect_list)
newlist = find_bisection(newlist);
return newlist;
}
static void add_pending_object(struct object *obj, const char *name)
{
add_object(obj, &pending_objects, name);
}
static struct commit *get_commit_reference(const char *name, const unsigned char *sha1, unsigned int flags)
{
struct object *object;
object = parse_object(sha1);
if (!object)
die("bad object %s", name);
/*
* Tag object? Look what it points to..
*/
while (object->type == tag_type) {
struct tag *tag = (struct tag *) object;
object->flags |= flags;
if (tag_objects && !(object->flags & UNINTERESTING))
add_pending_object(object, tag->tag);
object = parse_object(tag->tagged->sha1);
if (!object)
die("bad object %s", sha1_to_hex(tag->tagged->sha1));
}
/*
* Commit object? Just return it, we'll do all the complex
* reachability crud.
*/
if (object->type == commit_type) {
struct commit *commit = (struct commit *)object;
object->flags |= flags;
if (parse_commit(commit) < 0)
die("unable to parse commit %s", name);
if (flags & UNINTERESTING)
mark_parents_uninteresting(commit);
return commit;
}
/*
* Tree object? Either mark it uniniteresting, or add it
* to the list of objects to look at later..
*/
if (object->type == tree_type) {
struct tree *tree = (struct tree *)object;
if (!tree_objects)
return NULL;
if (flags & UNINTERESTING) {
mark_tree_uninteresting(tree);
return NULL;
}
add_pending_object(object, "");
return NULL;
}
/*
* Blob object? You know the drill by now..
*/
if (object->type == blob_type) {
struct blob *blob = (struct blob *)object;
if (!blob_objects)
return NULL;
if (flags & UNINTERESTING) {
mark_blob_uninteresting(blob);
return NULL;
}
add_pending_object(object, "");
return NULL;
}
die("%s is unknown object", name);
}
static void handle_one_commit(struct commit *com, struct commit_list **lst)
{
if (!com || com->object.flags & SEEN)
return;
com->object.flags |= SEEN;
commit_list_insert(com, lst);
}
/* for_each_ref() callback does not allow user data -- Yuck. */
static struct commit_list **global_lst;
static int include_one_commit(const char *path, const unsigned char *sha1)
{
struct commit *com = get_commit_reference(path, sha1, 0);
handle_one_commit(com, global_lst);
return 0;
}
static void handle_all(struct commit_list **lst)
{
global_lst = lst;
for_each_ref(include_one_commit);
global_lst = NULL;
}
int main(int argc, const char **argv)
{
const char *prefix = setup_git_directory();
struct commit_list *list = NULL;
int i, limited = 0;
for (i = 1 ; i < argc; i++) {
int flags;
const char *arg = argv[i];
char *dotdot;
struct commit *commit;
unsigned char sha1[20];
if (!strncmp(arg, "--max-count=", 12)) {
max_count = atoi(arg + 12);
continue;
}
if (!strncmp(arg, "--max-age=", 10)) {
max_age = atoi(arg + 10);
limited = 1;
continue;
}
if (!strncmp(arg, "--min-age=", 10)) {
min_age = atoi(arg + 10);
limited = 1;
continue;
}
if (!strcmp(arg, "--header")) {
verbose_header = 1;
continue;
}
if (!strncmp(arg, "--pretty", 8)) {
commit_format = get_commit_format(arg+8);
verbose_header = 1;
hdr_termination = '\n';
if (commit_format == CMIT_FMT_ONELINE)
commit_prefix = "";
else
commit_prefix = "commit ";
continue;
}
if (!strncmp(arg, "--no-merges", 11)) {
no_merges = 1;
continue;
}
if (!strcmp(arg, "--parents")) {
show_parents = 1;
continue;
}
if (!strcmp(arg, "--bisect")) {
bisect_list = 1;
continue;
}
if (!strcmp(arg, "--all")) {
handle_all(&list);
continue;
}
if (!strcmp(arg, "--objects")) {
tag_objects = 1;
tree_objects = 1;
blob_objects = 1;
continue;
}
if (!strcmp(arg, "--unpacked")) {
unpacked = 1;
limited = 1;
continue;
}
if (!strcmp(arg, "--merge-order")) {
merge_order = 1;
continue;
}
if (!strcmp(arg, "--show-breaks")) {
show_breaks = 1;
continue;
}
if (!strcmp(arg, "--topo-order")) {
topo_order = 1;
limited = 1;
continue;
}
if (!strcmp(arg, "--dense")) {
dense = 1;
continue;
}
if (!strcmp(arg, "--sparse")) {
dense = 0;
continue;
}
if (!strcmp(arg, "--")) {
i++;
break;
}
if (show_breaks && !merge_order)
usage(rev_list_usage);
flags = 0;
dotdot = strstr(arg, "..");
if (dotdot) {
unsigned char from_sha1[20];
char *next = dotdot + 2;
*dotdot = 0;
if (!*next)
next = "HEAD";
if (!get_sha1(arg, from_sha1) && !get_sha1(next, sha1)) {
struct commit *exclude;
struct commit *include;
exclude = get_commit_reference(arg, from_sha1, UNINTERESTING);
include = get_commit_reference(next, sha1, 0);
if (!exclude || !include)
die("Invalid revision range %s..%s", arg, next);
limited = 1;
handle_one_commit(exclude, &list);
handle_one_commit(include, &list);
continue;
}
*dotdot = '.';
}
if (*arg == '^') {
flags = UNINTERESTING;
arg++;
limited = 1;
}
if (get_sha1(arg, sha1) < 0)
break;
commit = get_commit_reference(arg, sha1, flags);
handle_one_commit(commit, &list);
}
if (!list)
usage(rev_list_usage);
paths = get_pathspec(prefix, argv + i);
if (paths) {
limited = 1;
diff_tree_setup_paths(paths);
}
save_commit_buffer = verbose_header;
track_object_refs = 0;
if (!merge_order) {
sort_by_date(&list);
if (list && !limited && max_count == 1 &&
!tag_objects && !tree_objects && !blob_objects) {
show_commit(list->item);
return 0;
}
if (limited)
list = limit_list(list);
if (topo_order)
sort_in_topological_order(&list);
show_commit_list(list);
} else {
#ifndef NO_OPENSSL
if (sort_list_in_merge_order(list, &process_commit)) {
die("merge order sort failed\n");
}
#else
die("merge order sort unsupported, OpenSSL not linked");
#endif
}
return 0;
}
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