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Revision 4bd481e0ad9c6e78e320288886ffdad8f76dcfc1 authored by Jeff King on 17 January 2023, 03:04:44 UTC, committed by Johannes Schindelin on 06 February 2023, 08:27:09 UTC
The IOCTLFUNCTION option has been deprecated, and generates a compiler warning in recent versions of curl. We can switch to using SEEKFUNCTION instead. It was added in 2008 via curl 7.18.0; our INSTALL file already indicates we require at least curl 7.19.4. But there's one catch: curl says we should use CURL_SEEKFUNC_{OK,FAIL}, and those didn't arrive until 7.19.5. One workaround would be to use a bare 0/1 here (or define our own macros). But let's just bump the minimum required version to 7.19.5. That version is only a minor version bump from our existing requirement, and is only a 2 month time bump for versions that are almost 13 years old. So it's not likely that anybody cares about the distinction. Switching means we have to rewrite the ioctl functions into seek functions. In some ways they are simpler (seeking is the only operation), but in some ways more complex (the ioctl allowed only a full rewind, but now we can seek to arbitrary offsets). Curl will only ever use SEEK_SET (per their documentation), so I didn't bother implementing anything else, since it would naturally be completely untested. This seems unlikely to change, but I added an assertion just in case. Likewise, I doubt curl will ever try to seek outside of the buffer sizes we've told it, but I erred on the defensive side here, rather than do an out-of-bounds read. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
1 parent 4fab049
Tip revision: 4bd481e0ad9c6e78e320288886ffdad8f76dcfc1 authored by Jeff King on 17 January 2023, 03:04:44 UTC
http: prefer CURLOPT_SEEKFUNCTION to CURLOPT_IOCTLFUNCTION
http: prefer CURLOPT_SEEKFUNCTION to CURLOPT_IOCTLFUNCTION
Tip revision: 4bd481e
sparse-index.c
#include "cache.h"
#include "repository.h"
#include "sparse-index.h"
#include "tree.h"
#include "pathspec.h"
#include "trace2.h"
#include "cache-tree.h"
#include "config.h"
#include "dir.h"
#include "fsmonitor.h"
static struct cache_entry *construct_sparse_dir_entry(
struct index_state *istate,
const char *sparse_dir,
struct cache_tree *tree)
{
struct cache_entry *de;
de = make_cache_entry(istate, S_IFDIR, &tree->oid, sparse_dir, 0, 0);
de->ce_flags |= CE_SKIP_WORKTREE;
return de;
}
/*
* Returns the number of entries "inserted" into the index.
*/
static int convert_to_sparse_rec(struct index_state *istate,
int num_converted,
int start, int end,
const char *ct_path, size_t ct_pathlen,
struct cache_tree *ct)
{
int i, can_convert = 1;
int start_converted = num_converted;
struct strbuf child_path = STRBUF_INIT;
/*
* Is the current path outside of the sparse cone?
* Then check if the region can be replaced by a sparse
* directory entry (everything is sparse and merged).
*/
if (path_in_sparse_checkout(ct_path, istate))
can_convert = 0;
for (i = start; can_convert && i < end; i++) {
struct cache_entry *ce = istate->cache[i];
if (ce_stage(ce) ||
S_ISGITLINK(ce->ce_mode) ||
!(ce->ce_flags & CE_SKIP_WORKTREE))
can_convert = 0;
}
if (can_convert) {
struct cache_entry *se;
se = construct_sparse_dir_entry(istate, ct_path, ct);
istate->cache[num_converted++] = se;
return 1;
}
for (i = start; i < end; ) {
int count, span, pos = -1;
const char *base, *slash;
struct cache_entry *ce = istate->cache[i];
/*
* Detect if this is a normal entry outside of any subtree
* entry.
*/
base = ce->name + ct_pathlen;
slash = strchr(base, '/');
if (slash)
pos = cache_tree_subtree_pos(ct, base, slash - base);
if (pos < 0) {
istate->cache[num_converted++] = ce;
i++;
continue;
}
strbuf_setlen(&child_path, 0);
strbuf_add(&child_path, ce->name, slash - ce->name + 1);
span = ct->down[pos]->cache_tree->entry_count;
count = convert_to_sparse_rec(istate,
num_converted, i, i + span,
child_path.buf, child_path.len,
ct->down[pos]->cache_tree);
num_converted += count;
i += span;
}
strbuf_release(&child_path);
return num_converted - start_converted;
}
int set_sparse_index_config(struct repository *repo, int enable)
{
int res;
char *config_path = repo_git_path(repo, "config.worktree");
res = git_config_set_in_file_gently(config_path,
"index.sparse",
enable ? "true" : NULL);
free(config_path);
prepare_repo_settings(repo);
repo->settings.sparse_index = enable;
return res;
}
static int index_has_unmerged_entries(struct index_state *istate)
{
int i;
for (i = 0; i < istate->cache_nr; i++) {
if (ce_stage(istate->cache[i]))
return 1;
}
return 0;
}
int convert_to_sparse(struct index_state *istate, int flags)
{
int test_env;
if (istate->sparse_index || !istate->cache_nr ||
!core_apply_sparse_checkout || !core_sparse_checkout_cone)
return 0;
if (!istate->repo)
istate->repo = the_repository;
if (!(flags & SPARSE_INDEX_MEMORY_ONLY)) {
/*
* The sparse index is not (yet) integrated with a split index.
*/
if (istate->split_index)
return 0;
/*
* The GIT_TEST_SPARSE_INDEX environment variable triggers the
* index.sparse config variable to be on.
*/
test_env = git_env_bool("GIT_TEST_SPARSE_INDEX", -1);
if (test_env >= 0)
set_sparse_index_config(istate->repo, test_env);
/*
* Only convert to sparse if index.sparse is set.
*/
prepare_repo_settings(istate->repo);
if (!istate->repo->settings.sparse_index)
return 0;
}
if (init_sparse_checkout_patterns(istate))
return 0;
/*
* We need cone-mode patterns to use sparse-index. If a user edits
* their sparse-checkout file manually, then we can detect during
* parsing that they are not actually using cone-mode patterns and
* hence we need to abort this conversion _without error_. Warnings
* already exist in the pattern parsing to inform the user of their
* bad patterns.
*/
if (!istate->sparse_checkout_patterns->use_cone_patterns)
return 0;
/*
* NEEDSWORK: If we have unmerged entries, then stay full.
* Unmerged entries prevent the cache-tree extension from working.
*/
if (index_has_unmerged_entries(istate))
return 0;
/* Clear and recompute the cache-tree */
cache_tree_free(&istate->cache_tree);
/*
* Silently return if there is a problem with the cache tree update,
* which might just be due to a conflict state in some entry.
*
* This might create new tree objects, so be sure to use
* WRITE_TREE_MISSING_OK.
*/
if (cache_tree_update(istate, WRITE_TREE_MISSING_OK))
return 0;
remove_fsmonitor(istate);
trace2_region_enter("index", "convert_to_sparse", istate->repo);
istate->cache_nr = convert_to_sparse_rec(istate,
0, 0, istate->cache_nr,
"", 0, istate->cache_tree);
/* Clear and recompute the cache-tree */
cache_tree_free(&istate->cache_tree);
cache_tree_update(istate, 0);
istate->fsmonitor_has_run_once = 0;
FREE_AND_NULL(istate->fsmonitor_dirty);
FREE_AND_NULL(istate->fsmonitor_last_update);
istate->sparse_index = 1;
trace2_region_leave("index", "convert_to_sparse", istate->repo);
return 0;
}
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 | CE_EXTENDED;
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));
memcpy(&istate->dir_hash, &full->dir_hash, sizeof(full->dir_hash));
istate->sparse_index = 0;
free(istate->cache);
istate->cache = full->cache;
istate->cache_nr = full->cache_nr;
istate->cache_alloc = full->cache_alloc;
istate->fsmonitor_has_run_once = 0;
FREE_AND_NULL(istate->fsmonitor_dirty);
FREE_AND_NULL(istate->fsmonitor_last_update);
strbuf_release(&base);
free(full);
/* Clear and recompute the cache-tree */
cache_tree_free(&istate->cache_tree);
cache_tree_update(istate, 0);
trace2_region_leave("index", "ensure_full_index", istate->repo);
}
/*
* This static global helps avoid infinite recursion between
* expand_to_path() and index_file_exists().
*/
static int in_expand_to_path = 0;
void expand_to_path(struct index_state *istate,
const char *path, size_t pathlen, int icase)
{
struct strbuf path_mutable = STRBUF_INIT;
size_t substr_len;
/* prevent extra recursion */
if (in_expand_to_path)
return;
if (!istate || !istate->sparse_index)
return;
if (!istate->repo)
istate->repo = the_repository;
in_expand_to_path = 1;
/*
* We only need to actually expand a region if the
* following are both true:
*
* 1. 'path' is not already in the index.
* 2. Some parent directory of 'path' is a sparse directory.
*/
if (index_file_exists(istate, path, pathlen, icase))
goto cleanup;
strbuf_add(&path_mutable, path, pathlen);
strbuf_addch(&path_mutable, '/');
/* Check the name hash for all parent directories */
substr_len = 0;
while (substr_len < pathlen) {
char temp;
char *replace = strchr(path_mutable.buf + substr_len, '/');
if (!replace)
break;
/* replace the character _after_ the slash */
replace++;
temp = *replace;
*replace = '\0';
if (index_file_exists(istate, path_mutable.buf,
path_mutable.len, icase)) {
/*
* We found a parent directory in the name-hash
* hashtable, because only sparse directory entries
* have a trailing '/' character. Since "path" wasn't
* in the index, perhaps it exists within this
* sparse-directory. Expand accordingly.
*/
ensure_full_index(istate);
break;
}
*replace = temp;
substr_len = replace - path_mutable.buf;
}
cleanup:
strbuf_release(&path_mutable);
in_expand_to_path = 0;
}
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