mirror of
https://github.com/git/git.git
synced 2024-11-30 21:44:02 +08:00
3d12d0cfbb
If git-write-index is called without --missing-ok, it reports invalid objects that it finds in the index. But without this patch it dies right away or may run into an infinite loop. Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at> Signed-off-by: Junio C Hamano <junkio@cox.net>
558 lines
12 KiB
C
558 lines
12 KiB
C
#include "cache.h"
|
|
#include "tree.h"
|
|
#include "cache-tree.h"
|
|
|
|
#ifndef DEBUG
|
|
#define DEBUG 0
|
|
#endif
|
|
|
|
struct cache_tree *cache_tree(void)
|
|
{
|
|
struct cache_tree *it = xcalloc(1, sizeof(struct cache_tree));
|
|
it->entry_count = -1;
|
|
return it;
|
|
}
|
|
|
|
void cache_tree_free(struct cache_tree **it_p)
|
|
{
|
|
int i;
|
|
struct cache_tree *it = *it_p;
|
|
|
|
if (!it)
|
|
return;
|
|
for (i = 0; i < it->subtree_nr; i++)
|
|
if (it->down[i])
|
|
cache_tree_free(&it->down[i]->cache_tree);
|
|
free(it->down);
|
|
free(it);
|
|
*it_p = NULL;
|
|
}
|
|
|
|
static int subtree_name_cmp(const char *one, int onelen,
|
|
const char *two, int twolen)
|
|
{
|
|
if (onelen < twolen)
|
|
return -1;
|
|
if (twolen < onelen)
|
|
return 1;
|
|
return memcmp(one, two, onelen);
|
|
}
|
|
|
|
static int subtree_pos(struct cache_tree *it, const char *path, int pathlen)
|
|
{
|
|
struct cache_tree_sub **down = it->down;
|
|
int lo, hi;
|
|
lo = 0;
|
|
hi = it->subtree_nr;
|
|
while (lo < hi) {
|
|
int mi = (lo + hi) / 2;
|
|
struct cache_tree_sub *mdl = down[mi];
|
|
int cmp = subtree_name_cmp(path, pathlen,
|
|
mdl->name, mdl->namelen);
|
|
if (!cmp)
|
|
return mi;
|
|
if (cmp < 0)
|
|
hi = mi;
|
|
else
|
|
lo = mi + 1;
|
|
}
|
|
return -lo-1;
|
|
}
|
|
|
|
static struct cache_tree_sub *find_subtree(struct cache_tree *it,
|
|
const char *path,
|
|
int pathlen,
|
|
int create)
|
|
{
|
|
struct cache_tree_sub *down;
|
|
int pos = subtree_pos(it, path, pathlen);
|
|
if (0 <= pos)
|
|
return it->down[pos];
|
|
if (!create)
|
|
return NULL;
|
|
|
|
pos = -pos-1;
|
|
if (it->subtree_alloc <= it->subtree_nr) {
|
|
it->subtree_alloc = alloc_nr(it->subtree_alloc);
|
|
it->down = xrealloc(it->down, it->subtree_alloc *
|
|
sizeof(*it->down));
|
|
}
|
|
it->subtree_nr++;
|
|
|
|
down = xmalloc(sizeof(*down) + pathlen + 1);
|
|
down->cache_tree = NULL;
|
|
down->namelen = pathlen;
|
|
memcpy(down->name, path, pathlen);
|
|
down->name[pathlen] = 0;
|
|
|
|
if (pos < it->subtree_nr)
|
|
memmove(it->down + pos + 1,
|
|
it->down + pos,
|
|
sizeof(down) * (it->subtree_nr - pos - 1));
|
|
it->down[pos] = down;
|
|
return down;
|
|
}
|
|
|
|
struct cache_tree_sub *cache_tree_sub(struct cache_tree *it, const char *path)
|
|
{
|
|
int pathlen = strlen(path);
|
|
return find_subtree(it, path, pathlen, 1);
|
|
}
|
|
|
|
void cache_tree_invalidate_path(struct cache_tree *it, const char *path)
|
|
{
|
|
/* a/b/c
|
|
* ==> invalidate self
|
|
* ==> find "a", have it invalidate "b/c"
|
|
* a
|
|
* ==> invalidate self
|
|
* ==> if "a" exists as a subtree, remove it.
|
|
*/
|
|
const char *slash;
|
|
int namelen;
|
|
struct cache_tree_sub *down;
|
|
|
|
#if DEBUG
|
|
fprintf(stderr, "cache-tree invalidate <%s>\n", path);
|
|
#endif
|
|
|
|
if (!it)
|
|
return;
|
|
slash = strchr(path, '/');
|
|
it->entry_count = -1;
|
|
if (!slash) {
|
|
int pos;
|
|
namelen = strlen(path);
|
|
pos = subtree_pos(it, path, namelen);
|
|
if (0 <= pos) {
|
|
cache_tree_free(&it->down[pos]->cache_tree);
|
|
free(it->down[pos]);
|
|
/* 0 1 2 3 4 5
|
|
* ^ ^subtree_nr = 6
|
|
* pos
|
|
* move 4 and 5 up one place (2 entries)
|
|
* 2 = 6 - 3 - 1 = subtree_nr - pos - 1
|
|
*/
|
|
memmove(it->down+pos, it->down+pos+1,
|
|
sizeof(struct cache_tree_sub *) *
|
|
(it->subtree_nr - pos - 1));
|
|
it->subtree_nr--;
|
|
}
|
|
return;
|
|
}
|
|
namelen = slash - path;
|
|
down = find_subtree(it, path, namelen, 0);
|
|
if (down)
|
|
cache_tree_invalidate_path(down->cache_tree, slash + 1);
|
|
}
|
|
|
|
static int verify_cache(struct cache_entry **cache,
|
|
int entries)
|
|
{
|
|
int i, funny;
|
|
|
|
/* Verify that the tree is merged */
|
|
funny = 0;
|
|
for (i = 0; i < entries; i++) {
|
|
struct cache_entry *ce = cache[i];
|
|
if (ce_stage(ce)) {
|
|
if (10 < ++funny) {
|
|
fprintf(stderr, "...\n");
|
|
break;
|
|
}
|
|
fprintf(stderr, "%s: unmerged (%s)\n",
|
|
ce->name, sha1_to_hex(ce->sha1));
|
|
}
|
|
}
|
|
if (funny)
|
|
return -1;
|
|
|
|
/* Also verify that the cache does not have path and path/file
|
|
* at the same time. At this point we know the cache has only
|
|
* stage 0 entries.
|
|
*/
|
|
funny = 0;
|
|
for (i = 0; i < entries - 1; i++) {
|
|
/* path/file always comes after path because of the way
|
|
* the cache is sorted. Also path can appear only once,
|
|
* which means conflicting one would immediately follow.
|
|
*/
|
|
const char *this_name = cache[i]->name;
|
|
const char *next_name = cache[i+1]->name;
|
|
int this_len = strlen(this_name);
|
|
if (this_len < strlen(next_name) &&
|
|
strncmp(this_name, next_name, this_len) == 0 &&
|
|
next_name[this_len] == '/') {
|
|
if (10 < ++funny) {
|
|
fprintf(stderr, "...\n");
|
|
break;
|
|
}
|
|
fprintf(stderr, "You have both %s and %s\n",
|
|
this_name, next_name);
|
|
}
|
|
}
|
|
if (funny)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static void discard_unused_subtrees(struct cache_tree *it)
|
|
{
|
|
struct cache_tree_sub **down = it->down;
|
|
int nr = it->subtree_nr;
|
|
int dst, src;
|
|
for (dst = src = 0; src < nr; src++) {
|
|
struct cache_tree_sub *s = down[src];
|
|
if (s->used)
|
|
down[dst++] = s;
|
|
else {
|
|
cache_tree_free(&s->cache_tree);
|
|
free(s);
|
|
it->subtree_nr--;
|
|
}
|
|
}
|
|
}
|
|
|
|
int cache_tree_fully_valid(struct cache_tree *it)
|
|
{
|
|
int i;
|
|
if (!it)
|
|
return 0;
|
|
if (it->entry_count < 0 || !has_sha1_file(it->sha1))
|
|
return 0;
|
|
for (i = 0; i < it->subtree_nr; i++) {
|
|
if (!cache_tree_fully_valid(it->down[i]->cache_tree))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int update_one(struct cache_tree *it,
|
|
struct cache_entry **cache,
|
|
int entries,
|
|
const char *base,
|
|
int baselen,
|
|
int missing_ok,
|
|
int dryrun)
|
|
{
|
|
unsigned long size, offset;
|
|
char *buffer;
|
|
int i;
|
|
|
|
if (0 <= it->entry_count && has_sha1_file(it->sha1))
|
|
return it->entry_count;
|
|
|
|
/*
|
|
* We first scan for subtrees and update them; we start by
|
|
* marking existing subtrees -- the ones that are unmarked
|
|
* should not be in the result.
|
|
*/
|
|
for (i = 0; i < it->subtree_nr; i++)
|
|
it->down[i]->used = 0;
|
|
|
|
/*
|
|
* Find the subtrees and update them.
|
|
*/
|
|
for (i = 0; i < entries; i++) {
|
|
struct cache_entry *ce = cache[i];
|
|
struct cache_tree_sub *sub;
|
|
const char *path, *slash;
|
|
int pathlen, sublen, subcnt;
|
|
|
|
path = ce->name;
|
|
pathlen = ce_namelen(ce);
|
|
if (pathlen <= baselen || memcmp(base, path, baselen))
|
|
break; /* at the end of this level */
|
|
|
|
slash = strchr(path + baselen, '/');
|
|
if (!slash)
|
|
continue;
|
|
/*
|
|
* a/bbb/c (base = a/, slash = /c)
|
|
* ==>
|
|
* path+baselen = bbb/c, sublen = 3
|
|
*/
|
|
sublen = slash - (path + baselen);
|
|
sub = find_subtree(it, path + baselen, sublen, 1);
|
|
if (!sub->cache_tree)
|
|
sub->cache_tree = cache_tree();
|
|
subcnt = update_one(sub->cache_tree,
|
|
cache + i, entries - i,
|
|
path,
|
|
baselen + sublen + 1,
|
|
missing_ok,
|
|
dryrun);
|
|
if (subcnt < 0)
|
|
return subcnt;
|
|
i += subcnt - 1;
|
|
sub->used = 1;
|
|
}
|
|
|
|
discard_unused_subtrees(it);
|
|
|
|
/*
|
|
* Then write out the tree object for this level.
|
|
*/
|
|
size = 8192;
|
|
buffer = xmalloc(size);
|
|
offset = 0;
|
|
|
|
for (i = 0; i < entries; i++) {
|
|
struct cache_entry *ce = cache[i];
|
|
struct cache_tree_sub *sub;
|
|
const char *path, *slash;
|
|
int pathlen, entlen;
|
|
const unsigned char *sha1;
|
|
unsigned mode;
|
|
|
|
path = ce->name;
|
|
pathlen = ce_namelen(ce);
|
|
if (pathlen <= baselen || memcmp(base, path, baselen))
|
|
break; /* at the end of this level */
|
|
|
|
slash = strchr(path + baselen, '/');
|
|
if (slash) {
|
|
entlen = slash - (path + baselen);
|
|
sub = find_subtree(it, path + baselen, entlen, 0);
|
|
if (!sub)
|
|
die("cache-tree.c: '%.*s' in '%s' not found",
|
|
entlen, path + baselen, path);
|
|
i += sub->cache_tree->entry_count - 1;
|
|
sha1 = sub->cache_tree->sha1;
|
|
mode = S_IFDIR;
|
|
}
|
|
else {
|
|
sha1 = ce->sha1;
|
|
mode = ntohl(ce->ce_mode);
|
|
entlen = pathlen - baselen;
|
|
}
|
|
if (!missing_ok && !has_sha1_file(sha1))
|
|
return error("invalid object %s", sha1_to_hex(sha1));
|
|
|
|
if (!ce->ce_mode)
|
|
continue; /* entry being removed */
|
|
|
|
if (size < offset + entlen + 100) {
|
|
size = alloc_nr(offset + entlen + 100);
|
|
buffer = xrealloc(buffer, size);
|
|
}
|
|
offset += sprintf(buffer + offset,
|
|
"%o %.*s", mode, entlen, path + baselen);
|
|
buffer[offset++] = 0;
|
|
hashcpy((unsigned char*)buffer + offset, sha1);
|
|
offset += 20;
|
|
|
|
#if DEBUG
|
|
fprintf(stderr, "cache-tree update-one %o %.*s\n",
|
|
mode, entlen, path + baselen);
|
|
#endif
|
|
}
|
|
|
|
if (dryrun)
|
|
hash_sha1_file(buffer, offset, tree_type, it->sha1);
|
|
else
|
|
write_sha1_file(buffer, offset, tree_type, it->sha1);
|
|
free(buffer);
|
|
it->entry_count = i;
|
|
#if DEBUG
|
|
fprintf(stderr, "cache-tree update-one (%d ent, %d subtree) %s\n",
|
|
it->entry_count, it->subtree_nr,
|
|
sha1_to_hex(it->sha1));
|
|
#endif
|
|
return i;
|
|
}
|
|
|
|
int cache_tree_update(struct cache_tree *it,
|
|
struct cache_entry **cache,
|
|
int entries,
|
|
int missing_ok,
|
|
int dryrun)
|
|
{
|
|
int i;
|
|
i = verify_cache(cache, entries);
|
|
if (i)
|
|
return i;
|
|
i = update_one(it, cache, entries, "", 0, missing_ok, dryrun);
|
|
if (i < 0)
|
|
return i;
|
|
return 0;
|
|
}
|
|
|
|
static void *write_one(struct cache_tree *it,
|
|
char *path,
|
|
int pathlen,
|
|
char *buffer,
|
|
unsigned long *size,
|
|
unsigned long *offset)
|
|
{
|
|
int i;
|
|
|
|
/* One "cache-tree" entry consists of the following:
|
|
* path (NUL terminated)
|
|
* entry_count, subtree_nr ("%d %d\n")
|
|
* tree-sha1 (missing if invalid)
|
|
* subtree_nr "cache-tree" entries for subtrees.
|
|
*/
|
|
if (*size < *offset + pathlen + 100) {
|
|
*size = alloc_nr(*offset + pathlen + 100);
|
|
buffer = xrealloc(buffer, *size);
|
|
}
|
|
*offset += sprintf(buffer + *offset, "%.*s%c%d %d\n",
|
|
pathlen, path, 0,
|
|
it->entry_count, it->subtree_nr);
|
|
|
|
#if DEBUG
|
|
if (0 <= it->entry_count)
|
|
fprintf(stderr, "cache-tree <%.*s> (%d ent, %d subtree) %s\n",
|
|
pathlen, path, it->entry_count, it->subtree_nr,
|
|
sha1_to_hex(it->sha1));
|
|
else
|
|
fprintf(stderr, "cache-tree <%.*s> (%d subtree) invalid\n",
|
|
pathlen, path, it->subtree_nr);
|
|
#endif
|
|
|
|
if (0 <= it->entry_count) {
|
|
hashcpy((unsigned char*)buffer + *offset, it->sha1);
|
|
*offset += 20;
|
|
}
|
|
for (i = 0; i < it->subtree_nr; i++) {
|
|
struct cache_tree_sub *down = it->down[i];
|
|
if (i) {
|
|
struct cache_tree_sub *prev = it->down[i-1];
|
|
if (subtree_name_cmp(down->name, down->namelen,
|
|
prev->name, prev->namelen) <= 0)
|
|
die("fatal - unsorted cache subtree");
|
|
}
|
|
buffer = write_one(down->cache_tree, down->name, down->namelen,
|
|
buffer, size, offset);
|
|
}
|
|
return buffer;
|
|
}
|
|
|
|
void *cache_tree_write(struct cache_tree *root, unsigned long *size_p)
|
|
{
|
|
char path[PATH_MAX];
|
|
unsigned long size = 8192;
|
|
char *buffer = xmalloc(size);
|
|
|
|
*size_p = 0;
|
|
path[0] = 0;
|
|
return write_one(root, path, 0, buffer, &size, size_p);
|
|
}
|
|
|
|
static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
|
|
{
|
|
const char *buf = *buffer;
|
|
unsigned long size = *size_p;
|
|
const char *cp;
|
|
char *ep;
|
|
struct cache_tree *it;
|
|
int i, subtree_nr;
|
|
|
|
it = NULL;
|
|
/* skip name, but make sure name exists */
|
|
while (size && *buf) {
|
|
size--;
|
|
buf++;
|
|
}
|
|
if (!size)
|
|
goto free_return;
|
|
buf++; size--;
|
|
it = cache_tree();
|
|
|
|
cp = buf;
|
|
it->entry_count = strtol(cp, &ep, 10);
|
|
if (cp == ep)
|
|
goto free_return;
|
|
cp = ep;
|
|
subtree_nr = strtol(cp, &ep, 10);
|
|
if (cp == ep)
|
|
goto free_return;
|
|
while (size && *buf && *buf != '\n') {
|
|
size--;
|
|
buf++;
|
|
}
|
|
if (!size)
|
|
goto free_return;
|
|
buf++; size--;
|
|
if (0 <= it->entry_count) {
|
|
if (size < 20)
|
|
goto free_return;
|
|
hashcpy(it->sha1, (unsigned char*)buf);
|
|
buf += 20;
|
|
size -= 20;
|
|
}
|
|
|
|
#if DEBUG
|
|
if (0 <= it->entry_count)
|
|
fprintf(stderr, "cache-tree <%s> (%d ent, %d subtree) %s\n",
|
|
*buffer, it->entry_count, subtree_nr,
|
|
sha1_to_hex(it->sha1));
|
|
else
|
|
fprintf(stderr, "cache-tree <%s> (%d subtrees) invalid\n",
|
|
*buffer, subtree_nr);
|
|
#endif
|
|
|
|
/*
|
|
* Just a heuristic -- we do not add directories that often but
|
|
* we do not want to have to extend it immediately when we do,
|
|
* hence +2.
|
|
*/
|
|
it->subtree_alloc = subtree_nr + 2;
|
|
it->down = xcalloc(it->subtree_alloc, sizeof(struct cache_tree_sub *));
|
|
for (i = 0; i < subtree_nr; i++) {
|
|
/* read each subtree */
|
|
struct cache_tree *sub;
|
|
struct cache_tree_sub *subtree;
|
|
const char *name = buf;
|
|
|
|
sub = read_one(&buf, &size);
|
|
if (!sub)
|
|
goto free_return;
|
|
subtree = cache_tree_sub(it, name);
|
|
subtree->cache_tree = sub;
|
|
}
|
|
if (subtree_nr != it->subtree_nr)
|
|
die("cache-tree: internal error");
|
|
*buffer = buf;
|
|
*size_p = size;
|
|
return it;
|
|
|
|
free_return:
|
|
cache_tree_free(&it);
|
|
return NULL;
|
|
}
|
|
|
|
struct cache_tree *cache_tree_read(const char *buffer, unsigned long size)
|
|
{
|
|
if (buffer[0])
|
|
return NULL; /* not the whole tree */
|
|
return read_one(&buffer, &size);
|
|
}
|
|
|
|
struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
|
|
{
|
|
while (*path) {
|
|
const char *slash;
|
|
struct cache_tree_sub *sub;
|
|
|
|
slash = strchr(path, '/');
|
|
if (!slash)
|
|
slash = path + strlen(path);
|
|
/* between path and slash is the name of the
|
|
* subtree to look for.
|
|
*/
|
|
sub = find_subtree(it, path, slash - path, 0);
|
|
if (!sub)
|
|
return NULL;
|
|
it = sub->cache_tree;
|
|
if (slash)
|
|
while (*slash && *slash == '/')
|
|
slash++;
|
|
if (!slash || !*slash)
|
|
return it; /* prefix ended with slashes */
|
|
path = slash;
|
|
}
|
|
return it;
|
|
}
|