mirror of
https://github.com/git/git.git
synced 2024-12-12 03:14:11 +08:00
4300f8442a
We will mark an in-memory index_state as having sparse directory entries with the sparse_index bit. These currently cannot exist, but we will add a mechanism for collapsing a full index to a sparse one in a later change. That will happen at write time, so we must first allow parsing the format before writing it. Commands or methods that require a full index in order to operate can call ensure_full_index() to expand that index in-memory. This requires parsing trees using that index's repository. Sparse directory entries have a specific 'ce_mode' value. The macro S_ISSPARSEDIR(ce->ce_mode) can check if a cache_entry 'ce' has this type. This ce_mode is not possible with the existing index formats, so we don't also verify all properties of a sparse-directory entry, which are: 1. ce->ce_mode == 0040000 2. ce->flags & CE_SKIP_WORKTREE is true 3. ce->name[ce->namelen - 1] == '/' (ends in dir separator) 4. ce->oid references a tree object. These are all semi-enforced in ensure_full_index() to some extent. Any deviation will cause a warning at minimum or a failure in the worst case. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
#include "cache.h"
|
|
#include "repository.h"
|
|
#include "sparse-index.h"
|
|
#include "tree.h"
|
|
#include "pathspec.h"
|
|
#include "trace2.h"
|
|
|
|
static void set_index_entry(struct index_state *istate, int nr, struct cache_entry *ce)
|
|
{
|
|
ALLOC_GROW(istate->cache, nr + 1, istate->cache_alloc);
|
|
|
|
istate->cache[nr] = ce;
|
|
add_name_hash(istate, ce);
|
|
}
|
|
|
|
static int add_path_to_index(const struct object_id *oid,
|
|
struct strbuf *base, const char *path,
|
|
unsigned int mode, void *context)
|
|
{
|
|
struct index_state *istate = (struct index_state *)context;
|
|
struct cache_entry *ce;
|
|
size_t len = base->len;
|
|
|
|
if (S_ISDIR(mode))
|
|
return READ_TREE_RECURSIVE;
|
|
|
|
strbuf_addstr(base, path);
|
|
|
|
ce = make_cache_entry(istate, mode, oid, base->buf, 0, 0);
|
|
ce->ce_flags |= CE_SKIP_WORKTREE;
|
|
set_index_entry(istate, istate->cache_nr++, ce);
|
|
|
|
strbuf_setlen(base, len);
|
|
return 0;
|
|
}
|
|
|
|
void ensure_full_index(struct index_state *istate)
|
|
{
|
|
int i;
|
|
struct index_state *full;
|
|
struct strbuf base = STRBUF_INIT;
|
|
|
|
if (!istate || !istate->sparse_index)
|
|
return;
|
|
|
|
if (!istate->repo)
|
|
istate->repo = the_repository;
|
|
|
|
trace2_region_enter("index", "ensure_full_index", istate->repo);
|
|
|
|
/* initialize basics of new index */
|
|
full = xcalloc(1, sizeof(struct index_state));
|
|
memcpy(full, istate, sizeof(struct index_state));
|
|
|
|
/* then change the necessary things */
|
|
full->sparse_index = 0;
|
|
full->cache_alloc = (3 * istate->cache_alloc) / 2;
|
|
full->cache_nr = 0;
|
|
ALLOC_ARRAY(full->cache, full->cache_alloc);
|
|
|
|
for (i = 0; i < istate->cache_nr; i++) {
|
|
struct cache_entry *ce = istate->cache[i];
|
|
struct tree *tree;
|
|
struct pathspec ps;
|
|
|
|
if (!S_ISSPARSEDIR(ce->ce_mode)) {
|
|
set_index_entry(full, full->cache_nr++, ce);
|
|
continue;
|
|
}
|
|
if (!(ce->ce_flags & CE_SKIP_WORKTREE))
|
|
warning(_("index entry is a directory, but not sparse (%08x)"),
|
|
ce->ce_flags);
|
|
|
|
/* recursively walk into cd->name */
|
|
tree = lookup_tree(istate->repo, &ce->oid);
|
|
|
|
memset(&ps, 0, sizeof(ps));
|
|
ps.recursive = 1;
|
|
ps.has_wildcard = 1;
|
|
ps.max_depth = -1;
|
|
|
|
strbuf_setlen(&base, 0);
|
|
strbuf_add(&base, ce->name, strlen(ce->name));
|
|
|
|
read_tree_at(istate->repo, tree, &base, &ps,
|
|
add_path_to_index, full);
|
|
|
|
/* free directory entries. full entries are re-used */
|
|
discard_cache_entry(ce);
|
|
}
|
|
|
|
/* Copy back into original index. */
|
|
memcpy(&istate->name_hash, &full->name_hash, sizeof(full->name_hash));
|
|
istate->sparse_index = 0;
|
|
free(istate->cache);
|
|
istate->cache = full->cache;
|
|
istate->cache_nr = full->cache_nr;
|
|
istate->cache_alloc = full->cache_alloc;
|
|
|
|
strbuf_release(&base);
|
|
free(full);
|
|
|
|
trace2_region_leave("index", "ensure_full_index", istate->repo);
|
|
}
|