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update-index: remove stale fallback code for "--unresolve"

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The "update-index --unresolve" is a relatively old feature that was
introduced in Git v1.4.1 (June 2006), which predates the
resolve-undo extension introduced in Git v1.7.0 (February 2010).
The original code that was limited only to work during a merge (and
not during a rebase or a cherry-pick) has been kept as the fallback
codepath to be used as a transition measure.

By now, for more than 10 years we have stored resolve-undo extension
in the index file, and the fallback code way outlived its usefulness.

Remove it, together with two file-scope static global variables.
One of these variables is still used by surviving function, but it
does not have to be a global at all, so move it to local to that
function.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2023-07-31 15:44:06 -07:00
parent 35901f1c24
commit c0a4ae7f4e
1 changed files with 11 additions and 101 deletions
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112
builtin/update-index.c
View file

@ -608,9 +608,6 @@ static const char * const update_index_usage[] = {
NULL
};
static struct object_id head_oid;
static struct object_id merge_head_oid;
static struct cache_entry *read_one_ent(const char *which,
struct object_id *ent, const char *path,
int namelen, int stage)
@ -639,107 +636,19 @@ static struct cache_entry *read_one_ent(const char *which,
return ce;
}
static int read_head_pointers(void)
{
static int result = -2; /* unknown yet */
if (result == -2) {
result = -1;
if (read_ref("HEAD", &head_oid))
return error("No HEAD -- no initial commit yet?");
if (read_ref("MERGE_HEAD", &merge_head_oid))
return error("Not in the middle of a merge");
result = 0;
}
return result;
}
static int unresolve_one(const char *path)
{
int namelen = strlen(path);
int pos;
int ret = 0;
struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
struct resolve_undo_info *ru = NULL;
struct string_list_item *item;
int res = 0;
if (the_index.resolve_undo) {
struct string_list_item *item;
item = string_list_lookup(the_index.resolve_undo, path);
if (item) {
ru = item->util;
item->util = NULL;
}
}
/* resolve-undo record exists for the path */
if (ru) {
ret = unmerge_index_entry(&the_index, path, ru);
free(ru);
return ret;
}
/* See if there is such entry in the index. */
pos = index_name_pos(&the_index, path, namelen);
if (0 <= pos) {
; /* resolve-undo record was used already -- fall back */
} else {
/* Is it unmerged? */
pos = -pos - 1;
if (pos < the_index.cache_nr) {
const struct cache_entry *ce = the_index.cache[pos];
if (ce_namelen(ce) == namelen &&
!memcmp(ce->name, path, namelen)) {
fprintf(stderr,
"%s: skipping still unmerged path.\n",
path);
}
goto free_return;
}
/* No, such a path does not exist -- removed */
}
/*
* We are not using resolve-undo information but just
* populating the stages #2 and #3 from HEAD and MERGE_HEAD.
*
* This is a flawed replacement of true "unresolve", as we do
* not have a way to recreate the stage #1 for the common
* ancestor (which may not be a unique merge-base between the
* two).
*/
if (read_head_pointers()) {
ret = -1;
goto free_return;
}
ce_2 = read_one_ent("our", &head_oid, path, namelen, 2);
ce_3 = read_one_ent("their", &merge_head_oid, path, namelen, 3);
if (!ce_2 || !ce_3) {
ret = -1;
goto free_return;
}
if (oideq(&ce_2->oid, &ce_3->oid) &&
ce_2->ce_mode == ce_3->ce_mode) {
fprintf(stderr, "%s: identical in both, skipping.\n",
path);
goto free_return;
}
remove_file_from_index(&the_index, path);
if (add_index_entry(&the_index, ce_2, ADD_CACHE_OK_TO_ADD)) {
error("%s: cannot add our version to the index.", path);
ret = -1;
goto free_return;
}
if (!add_index_entry(&the_index, ce_3, ADD_CACHE_OK_TO_ADD))
return 0;
error("%s: cannot add their version to the index.", path);
ret = -1;
free_return:
discard_cache_entry(ce_2);
discard_cache_entry(ce_3);
return ret;
if (!the_index.resolve_undo)
return res;
item = string_list_lookup(the_index.resolve_undo, path);
if (!item)
return res; /* no resolve-undo record for the path */
res = unmerge_index_entry(&the_index, path, item->util);
FREE_AND_NULL(item->util);
return res;
}
static int do_unresolve(int ac, const char **av,
@ -766,6 +675,7 @@ static int do_reupdate(const char **paths,
int pos;
int has_head = 1;
struct pathspec pathspec;
struct object_id head_oid;
parse_pathspec(&pathspec, 0,
PATHSPEC_PREFER_CWD,