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1058 lines (929 loc) · 26 KB
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#define USE_THE_REPOSITORY_VARIABLE
#define DISABLE_SIGN_COMPARE_WARNINGS
#include "git-compat-util.h"
#include "gettext.h"
#include "hex.h"
#include "lockfile.h"
#include "tree.h"
#include "tree-walk.h"
#include "cache-tree.h"
#include "object-file.h"
#include "odb.h"
#include "odb/transaction.h"
#include "read-cache-ll.h"
#include "replace-object.h"
#include "repository.h"
#include "promisor-remote.h"
#include "trace.h"
#include "trace2.h"
#ifndef DEBUG_CACHE_TREE
#define DEBUG_CACHE_TREE 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[i]);
}
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);
}
int cache_tree_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 - lo) / 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 = cache_tree_subtree_pos(it, path, pathlen);
if (0 <= pos)
return it->down[pos];
if (!create)
return NULL;
pos = -pos-1;
ALLOC_GROW(it->down, it->subtree_nr + 1, it->subtree_alloc);
it->subtree_nr++;
FLEX_ALLOC_MEM(down, name, path, pathlen);
down->cache_tree = NULL;
down->namelen = pathlen;
if (pos < it->subtree_nr)
MOVE_ARRAY(it->down + pos + 1, it->down + pos,
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);
}
static int do_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_CACHE_TREE
fprintf(stderr, "cache-tree invalidate <%s>\n", path);
#endif
if (!it)
return 0;
slash = strchrnul(path, '/');
namelen = slash - path;
it->entry_count = -1;
if (!*slash) {
int pos;
pos = cache_tree_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
*/
MOVE_ARRAY(it->down + pos, it->down + pos + 1,
it->subtree_nr - pos - 1);
it->subtree_nr--;
}
return 1;
}
down = find_subtree(it, path, namelen, 0);
if (down)
do_invalidate_path(down->cache_tree, slash + 1);
return 1;
}
void cache_tree_invalidate_path(struct index_state *istate, const char *path)
{
if (do_invalidate_path(istate->cache_tree, path))
istate->cache_changed |= CACHE_TREE_CHANGED;
}
static int verify_cache(struct index_state *istate, int flags)
{
unsigned i, funny;
int silent = flags & WRITE_TREE_SILENT;
/* Verify that the tree is merged */
funny = 0;
for (i = 0; i < istate->cache_nr; i++) {
const struct cache_entry *ce = istate->cache[i];
if (ce_stage(ce)) {
if (silent)
return -1;
if (10 < ++funny) {
fprintf(stderr, "...\n");
break;
}
fprintf(stderr, "%s: unmerged (%s)\n",
ce->name, oid_to_hex(&ce->oid));
}
}
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 + 1 < istate->cache_nr; 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 struct cache_entry *this_ce = istate->cache[i];
const struct cache_entry *next_ce = istate->cache[i + 1];
const char *this_name = this_ce->name;
const char *next_name = next_ce->name;
int this_len = ce_namelen(this_ce);
if (this_len < ce_namelen(next_ce) &&
next_name[this_len] == '/' &&
strncmp(this_name, next_name, this_len) == 0) {
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 ||
!odb_has_object(the_repository->objects, &it->oid,
ODB_HAS_OBJECT_RECHECK_PACKED | ODB_HAS_OBJECT_FETCH_PROMISOR))
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 must_check_existence(const struct cache_entry *ce)
{
return !(repo_has_promisor_remote(the_repository) && ce_skip_worktree(ce));
}
static int update_one(struct cache_tree *it,
struct cache_entry **cache,
int entries,
const char *base,
int baselen,
int *skip_count,
int flags)
{
struct strbuf buffer;
int missing_ok = flags & WRITE_TREE_MISSING_OK;
int dryrun = flags & WRITE_TREE_DRY_RUN;
int repair = flags & WRITE_TREE_REPAIR;
int to_invalidate = 0;
int i;
assert(!(dryrun && repair));
*skip_count = 0;
/*
* If the first entry of this region is a sparse directory
* entry corresponding exactly to 'base', then this cache_tree
* struct is a "leaf" in the data structure, pointing to the
* tree OID specified in the entry.
*/
if (entries > 0) {
const struct cache_entry *ce = cache[0];
if (S_ISSPARSEDIR(ce->ce_mode) &&
ce->ce_namelen == baselen &&
!strncmp(ce->name, base, baselen)) {
it->entry_count = 1;
oidcpy(&it->oid, &ce->oid);
return 1;
}
}
if (0 <= it->entry_count &&
odb_has_object(the_repository->objects, &it->oid,
ODB_HAS_OBJECT_RECHECK_PACKED | ODB_HAS_OBJECT_FETCH_PROMISOR))
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.
*/
i = 0;
while (i < entries) {
const struct cache_entry *ce = cache[i];
struct cache_tree_sub *sub;
const char *path, *slash;
int pathlen, sublen, subcnt, subskip;
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) {
i++;
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,
&subskip,
flags);
if (subcnt < 0)
return subcnt;
if (!subcnt)
die("index cache-tree records empty sub-tree");
i += subcnt;
sub->count = subcnt; /* to be used in the next loop */
*skip_count += subskip;
sub->used = 1;
}
discard_unused_subtrees(it);
/*
* Then write out the tree object for this level.
*/
strbuf_init(&buffer, 8192);
i = 0;
while (i < entries) {
const struct cache_entry *ce = cache[i];
struct cache_tree_sub *sub = NULL;
const char *path, *slash;
int pathlen, entlen;
const struct object_id *oid;
unsigned mode;
int expected_missing = 0;
int contains_ita = 0;
int ce_missing_ok;
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->count;
oid = &sub->cache_tree->oid;
mode = S_IFDIR;
contains_ita = sub->cache_tree->entry_count < 0;
if (contains_ita) {
to_invalidate = 1;
expected_missing = 1;
}
}
else {
oid = &ce->oid;
mode = ce->ce_mode;
entlen = pathlen - baselen;
i++;
}
ce_missing_ok = mode == S_IFGITLINK || missing_ok ||
!must_check_existence(ce);
if (is_null_oid(oid) ||
(!ce_missing_ok &&
!odb_has_object(the_repository->objects, oid,
ODB_HAS_OBJECT_RECHECK_PACKED | ODB_HAS_OBJECT_FETCH_PROMISOR))) {
strbuf_release(&buffer);
if (expected_missing)
return -1;
return error("invalid object %06o %s for '%.*s'",
mode, oid_to_hex(oid), entlen+baselen, path);
}
/*
* CE_REMOVE entries are removed before the index is
* written to disk. Skip them to remain consistent
* with the future on-disk index.
*/
if (ce->ce_flags & CE_REMOVE) {
*skip_count = *skip_count + 1;
continue;
}
/*
* CE_INTENT_TO_ADD entries exist in on-disk index but
* they are not part of generated trees. Invalidate up
* to root to force cache-tree users to read elsewhere.
*/
if (!sub && ce_intent_to_add(ce)) {
to_invalidate = 1;
continue;
}
/*
* "sub" can be an empty tree if all subentries are i-t-a.
*/
if (contains_ita && is_empty_tree_oid(oid, the_repository->hash_algo))
continue;
strbuf_grow(&buffer, entlen + 100);
strbuf_addf(&buffer, "%o %.*s%c", mode, entlen, path + baselen, '\0');
strbuf_add(&buffer, oid->hash, the_hash_algo->rawsz);
#if DEBUG_CACHE_TREE
fprintf(stderr, "cache-tree update-one %o %.*s\n",
mode, entlen, path + baselen);
#endif
}
if (repair) {
struct object_id oid;
hash_object_file(the_hash_algo, buffer.buf, buffer.len,
OBJ_TREE, &oid);
if (odb_has_object(the_repository->objects, &oid, ODB_HAS_OBJECT_RECHECK_PACKED))
oidcpy(&it->oid, &oid);
else
to_invalidate = 1;
} else if (dryrun) {
hash_object_file(the_hash_algo, buffer.buf, buffer.len,
OBJ_TREE, &it->oid);
} else if (odb_write_object_ext(the_repository->objects, buffer.buf, buffer.len, OBJ_TREE,
&it->oid, NULL, flags & WRITE_TREE_SILENT ? ODB_WRITE_OBJECT_SILENT : 0)) {
strbuf_release(&buffer);
return -1;
}
strbuf_release(&buffer);
it->entry_count = to_invalidate ? -1 : i - *skip_count;
#if DEBUG_CACHE_TREE
fprintf(stderr, "cache-tree update-one (%d ent, %d subtree) %s\n",
it->entry_count, it->subtree_nr,
oid_to_hex(&it->oid));
#endif
return i;
}
int cache_tree_update(struct index_state *istate, int flags)
{
struct odb_transaction *transaction;
int skip, i;
i = verify_cache(istate, flags);
if (i)
return i;
if (!istate->cache_tree)
istate->cache_tree = cache_tree();
if (!(flags & WRITE_TREE_MISSING_OK) && repo_has_promisor_remote(the_repository))
prefetch_cache_entries(istate, must_check_existence);
trace_performance_enter();
trace2_region_enter("cache_tree", "update", istate->repo);
transaction = odb_transaction_begin(the_repository->objects);
i = update_one(istate->cache_tree, istate->cache, istate->cache_nr,
"", 0, &skip, flags);
odb_transaction_commit(transaction);
trace2_region_leave("cache_tree", "update", istate->repo);
trace_performance_leave("cache_tree_update");
if (i < 0)
return i;
istate->cache_changed |= CACHE_TREE_CHANGED;
return 0;
}
static void write_one(struct strbuf *buffer, struct cache_tree *it,
const char *path, int pathlen)
{
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.
*/
strbuf_grow(buffer, pathlen + 100);
strbuf_add(buffer, path, pathlen);
strbuf_addf(buffer, "%c%d %d\n", 0, it->entry_count, it->subtree_nr);
#if DEBUG_CACHE_TREE
if (0 <= it->entry_count)
fprintf(stderr, "cache-tree <%.*s> (%d ent, %d subtree) %s\n",
pathlen, path, it->entry_count, it->subtree_nr,
oid_to_hex(&it->oid));
else
fprintf(stderr, "cache-tree <%.*s> (%d subtree) invalid\n",
pathlen, path, it->subtree_nr);
#endif
if (0 <= it->entry_count) {
strbuf_add(buffer, it->oid.hash, the_hash_algo->rawsz);
}
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");
}
write_one(buffer, down->cache_tree, down->name, down->namelen);
}
}
void cache_tree_write(struct strbuf *sb, struct cache_tree *root)
{
trace2_region_enter("cache_tree", "write", the_repository);
write_one(sb, root, "", 0);
trace2_region_leave("cache_tree", "write", the_repository);
}
static int parse_int(const char **ptr, unsigned long *len_p, int *out)
{
const char *s = *ptr;
unsigned long len = *len_p;
int ret = 0;
int sign = 1;
while (len && *s == '-') {
sign *= -1;
s++;
len--;
}
while (len) {
if (!isdigit(*s))
break;
ret *= 10;
ret += *s - '0';
s++;
len--;
}
if (s == *ptr)
return -1;
*ptr = s;
*len_p = len;
*out = sign * ret;
return 0;
}
static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
{
const char *buf = *buffer;
unsigned long size = *size_p;
struct cache_tree *it;
int i, subtree_nr;
const unsigned rawsz = the_hash_algo->rawsz;
it = NULL;
/* skip name, but make sure name exists */
while (size && *buf) {
size--;
buf++;
}
if (!size)
goto free_return;
buf++; size--;
it = cache_tree();
if (parse_int(&buf, &size, &it->entry_count) < 0)
goto free_return;
if (!size || *buf != ' ')
goto free_return;
buf++; size--;
if (parse_int(&buf, &size, &subtree_nr) < 0)
goto free_return;
if (!size || *buf != '\n')
goto free_return;
buf++; size--;
if (0 <= it->entry_count) {
if (size < rawsz)
goto free_return;
oidread(&it->oid, (const unsigned char *)buf,
the_repository->hash_algo);
buf += rawsz;
size -= rawsz;
}
#if DEBUG_CACHE_TREE
if (0 <= it->entry_count)
fprintf(stderr, "cache-tree <%s> (%d ent, %d subtree) %s\n",
*buffer, it->entry_count, subtree_nr,
oid_to_hex(&it->oid));
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;
CALLOC_ARRAY(it->down, it->subtree_alloc);
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)
{
struct cache_tree *result;
if (buffer[0])
return NULL; /* not the whole tree */
trace2_region_enter("cache_tree", "read", the_repository);
result = read_one(&buffer, &size);
trace2_region_leave("cache_tree", "read", the_repository);
return result;
}
static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
{
if (!it)
return NULL;
while (*path) {
const char *slash;
struct cache_tree_sub *sub;
slash = strchrnul(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;
path = slash;
while (*path == '/')
path++;
}
return it;
}
static int write_index_as_tree_internal(struct object_id *oid,
struct index_state *index_state,
int cache_tree_valid,
int flags,
const char *prefix)
{
if (flags & WRITE_TREE_IGNORE_CACHE_TREE) {
cache_tree_free(&index_state->cache_tree);
cache_tree_valid = 0;
}
if (!cache_tree_valid && cache_tree_update(index_state, flags) < 0)
return WRITE_TREE_UNMERGED_INDEX;
if (prefix) {
struct cache_tree *subtree;
subtree = cache_tree_find(index_state->cache_tree, prefix);
if (!subtree)
return WRITE_TREE_PREFIX_ERROR;
oidcpy(oid, &subtree->oid);
}
else
oidcpy(oid, &index_state->cache_tree->oid);
return 0;
}
struct tree *write_in_core_index_as_tree(struct repository *repo,
struct index_state *index_state) {
struct object_id o;
int was_valid, ret;
was_valid = index_state->cache_tree &&
cache_tree_fully_valid(index_state->cache_tree);
ret = write_index_as_tree_internal(&o, index_state, was_valid, 0, NULL);
if (ret == WRITE_TREE_UNMERGED_INDEX) {
int i;
bug("there are unmerged index entries:");
for (i = 0; i < index_state->cache_nr; i++) {
const struct cache_entry *ce = index_state->cache[i];
if (ce_stage(ce))
bug("%d %.*s", ce_stage(ce),
(int)ce_namelen(ce), ce->name);
}
BUG("unmerged index entries when writing in-core index");
}
return lookup_tree(repo, &index_state->cache_tree->oid);
}
int write_index_as_tree(struct object_id *oid, struct index_state *index_state, const char *index_path, int flags, const char *prefix)
{
int entries, was_valid;
struct lock_file lock_file = LOCK_INIT;
int ret;
hold_lock_file_for_update(&lock_file, index_path, LOCK_DIE_ON_ERROR);
entries = read_index_from(index_state, index_path,
repo_get_git_dir(the_repository));
if (entries < 0) {
ret = WRITE_TREE_UNREADABLE_INDEX;
goto out;
}
was_valid = !(flags & WRITE_TREE_IGNORE_CACHE_TREE) &&
index_state->cache_tree &&
cache_tree_fully_valid(index_state->cache_tree);
ret = write_index_as_tree_internal(oid, index_state, was_valid, flags,
prefix);
if (!ret && !was_valid) {
write_locked_index(index_state, &lock_file, COMMIT_LOCK);
/* Not being able to write is fine -- we are only interested
* in updating the cache-tree part, and if the next caller
* ends up using the old index with unupdated cache-tree part
* it misses the work we did here, but that is just a
* performance penalty and not a big deal.
*/
}
out:
rollback_lock_file(&lock_file);
return ret;
}
static void prime_cache_tree_sparse_dir(struct cache_tree *it,
struct tree *tree)
{
oidcpy(&it->oid, &tree->object.oid);
it->entry_count = 1;
}
static void prime_cache_tree_rec(struct repository *r,
struct cache_tree *it,
struct tree *tree,
struct strbuf *tree_path)
{
struct tree_desc desc;
struct name_entry entry;
int cnt;
size_t base_path_len = tree_path->len;
oidcpy(&it->oid, &tree->object.oid);
init_tree_desc(&desc, &tree->object.oid, tree->buffer, tree->size);
cnt = 0;
while (tree_entry(&desc, &entry)) {
if (!S_ISDIR(entry.mode))
cnt++;
else {
struct cache_tree_sub *sub;
struct tree *subtree = lookup_tree(r, &entry.oid);
if (repo_parse_tree(the_repository, subtree) < 0)
exit(128);
sub = cache_tree_sub(it, entry.path);
sub->cache_tree = cache_tree();
/*
* Recursively-constructed subtree path is only needed when working
* in a sparse index (where it's used to determine whether the
* subtree is a sparse directory in the index).
*/
if (r->index->sparse_index) {
strbuf_setlen(tree_path, base_path_len);
strbuf_add(tree_path, entry.path, entry.pathlen);
strbuf_addch(tree_path, '/');
}
/*
* If a sparse index is in use, the directory being processed may be
* sparse. To confirm that, we can check whether an entry with that
* exact name exists in the index. If it does, the created subtree
* should be sparse. Otherwise, cache tree expansion should continue
* as normal.
*/
if (r->index->sparse_index &&
index_entry_exists(r->index, tree_path->buf, tree_path->len))
prime_cache_tree_sparse_dir(sub->cache_tree, subtree);
else
prime_cache_tree_rec(r, sub->cache_tree, subtree, tree_path);
cnt += sub->cache_tree->entry_count;
}
}
it->entry_count = cnt;
}
void prime_cache_tree(struct repository *r,
struct index_state *istate,
struct tree *tree)
{
struct strbuf tree_path = STRBUF_INIT;
trace2_region_enter("cache-tree", "prime_cache_tree", r);
cache_tree_free(&istate->cache_tree);
istate->cache_tree = cache_tree();
prime_cache_tree_rec(r, istate->cache_tree, tree, &tree_path);
strbuf_release(&tree_path);
istate->cache_changed |= CACHE_TREE_CHANGED;
trace2_region_leave("cache-tree", "prime_cache_tree", r);
}
/*
* find the cache_tree that corresponds to the current level without
* exploding the full path into textual form. The root of the
* cache tree is given as "root", and our current level is "info".
* (1) When at root level, info->prev is NULL, so it is "root" itself.
* (2) Otherwise, find the cache_tree that corresponds to one level
* above us, and find ourselves in there.
*/
static struct cache_tree *find_cache_tree_from_traversal(struct cache_tree *root,
struct traverse_info *info)
{
struct cache_tree *our_parent;
if (!info->prev)
return root;
our_parent = find_cache_tree_from_traversal(root, info->prev);
return cache_tree_find(our_parent, info->name);
}
int cache_tree_matches_traversal(struct cache_tree *root,
struct name_entry *ent,
struct traverse_info *info)
{
struct cache_tree *it;
it = find_cache_tree_from_traversal(root, info);
it = cache_tree_find(it, ent->path);
if (it && it->entry_count > 0 && oideq(&ent->oid, &it->oid))
return it->entry_count;
return 0;
}
static int verify_one_sparse(struct index_state *istate,
struct strbuf *path,
int pos)
{
struct cache_entry *ce = istate->cache[pos];
if (!S_ISSPARSEDIR(ce->ce_mode))
return error(_("directory '%s' is present in index, but not sparse"),
path->buf);
return 0;
}
/*
* Returns:
* 0 - Verification completed.
* 1 - Restart verification - a call to ensure_full_index() freed the cache
* tree that is being verified and verification needs to be restarted from
* the new toplevel cache tree.
* -1 - Verification failed.
*/
static int verify_one(struct repository *r,
struct index_state *istate,
struct cache_tree *it,
struct strbuf *path)
{
int i, pos, len = path->len;
struct strbuf tree_buf = STRBUF_INIT;
struct object_id new_oid;
int ret;
for (i = 0; i < it->subtree_nr; i++) {
strbuf_addf(path, "%s/", it->down[i]->name);
ret = verify_one(r, istate, it->down[i]->cache_tree, path);
if (ret)
goto out;
strbuf_setlen(path, len);
}
if (it->entry_count < 0 ||
/* no verification on tests (t7003) that replace trees */
lookup_replace_object(r, &it->oid) != &it->oid) {
ret = 0;
goto out;
}
if (path->len) {
/*
* If the index is sparse and the cache tree is not
* index_name_pos() may trigger ensure_full_index() which will
* free the tree that is being verified.
*/
int is_sparse = istate->sparse_index;
pos = index_name_pos(istate, path->buf, path->len);
if (is_sparse && !istate->sparse_index) {
ret = 1;
goto out;
}
if (pos >= 0) {
ret = verify_one_sparse(istate, path, pos);
goto out;
}
pos = -pos - 1;
} else {
pos = 0;
}
if (it->entry_count + pos > istate->cache_nr) {
ret = error(_("corrupted cache-tree has entries not present in index"));
goto out;
}
i = 0;
while (i < it->entry_count) {
struct cache_entry *ce = istate->cache[pos + i];
const char *slash;
struct cache_tree_sub *sub = NULL;
const struct object_id *oid;
const char *name;
unsigned mode;
int entlen;
if (ce->ce_flags & (CE_STAGEMASK | CE_INTENT_TO_ADD | CE_REMOVE)) {
ret = error(_("%s with flags 0x%x should not be in cache-tree"),
ce->name, ce->ce_flags);
goto out;
}
name = ce->name + path->len;
slash = strchr(name, '/');
if (slash) {
entlen = slash - name;
sub = find_subtree(it, ce->name + path->len, entlen, 0);
if (!sub || sub->cache_tree->entry_count < 0) {
ret = error(_("bad subtree '%.*s'"), entlen, name);
goto out;
}
oid = &sub->cache_tree->oid;
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