mirror of
https://github.com/git/git.git
synced 2024-11-26 03:14:50 +08:00
00530834fb
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
#include "cache.h"
|
|
#include "sha1-lookup.h"
|
|
#include "refs.h"
|
|
#include "commit.h"
|
|
|
|
/*
|
|
* An array of replacements. The array is kept sorted by the original
|
|
* sha1.
|
|
*/
|
|
static struct replace_object {
|
|
unsigned char original[20];
|
|
unsigned char replacement[20];
|
|
} **replace_object;
|
|
|
|
static int replace_object_alloc, replace_object_nr;
|
|
|
|
static const unsigned char *replace_sha1_access(size_t index, void *table)
|
|
{
|
|
struct replace_object **replace = table;
|
|
return replace[index]->original;
|
|
}
|
|
|
|
static int replace_object_pos(const unsigned char *sha1)
|
|
{
|
|
return sha1_pos(sha1, replace_object, replace_object_nr,
|
|
replace_sha1_access);
|
|
}
|
|
|
|
static int register_replace_object(struct replace_object *replace,
|
|
int ignore_dups)
|
|
{
|
|
int pos = replace_object_pos(replace->original);
|
|
|
|
if (0 <= pos) {
|
|
if (ignore_dups)
|
|
free(replace);
|
|
else {
|
|
free(replace_object[pos]);
|
|
replace_object[pos] = replace;
|
|
}
|
|
return 1;
|
|
}
|
|
pos = -pos - 1;
|
|
ALLOC_GROW(replace_object, replace_object_nr + 1, replace_object_alloc);
|
|
replace_object_nr++;
|
|
if (pos < replace_object_nr)
|
|
memmove(replace_object + pos + 1,
|
|
replace_object + pos,
|
|
(replace_object_nr - pos - 1) *
|
|
sizeof(*replace_object));
|
|
replace_object[pos] = replace;
|
|
return 0;
|
|
}
|
|
|
|
static int register_replace_ref(const char *refname,
|
|
const struct object_id *oid,
|
|
int flag, void *cb_data)
|
|
{
|
|
/* Get sha1 from refname */
|
|
const char *slash = strrchr(refname, '/');
|
|
const char *hash = slash ? slash + 1 : refname;
|
|
struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj));
|
|
|
|
if (strlen(hash) != 40 || get_sha1_hex(hash, repl_obj->original)) {
|
|
free(repl_obj);
|
|
warning("bad replace ref name: %s", refname);
|
|
return 0;
|
|
}
|
|
|
|
/* Copy sha1 from the read ref */
|
|
hashcpy(repl_obj->replacement, oid->hash);
|
|
|
|
/* Register new object */
|
|
if (register_replace_object(repl_obj, 1))
|
|
die("duplicate replace ref: %s", refname);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void prepare_replace_object(void)
|
|
{
|
|
static int replace_object_prepared;
|
|
|
|
if (replace_object_prepared)
|
|
return;
|
|
|
|
for_each_replace_ref(register_replace_ref, NULL);
|
|
replace_object_prepared = 1;
|
|
if (!replace_object_nr)
|
|
check_replace_refs = 0;
|
|
}
|
|
|
|
/* We allow "recursive" replacement. Only within reason, though */
|
|
#define MAXREPLACEDEPTH 5
|
|
|
|
/*
|
|
* If a replacement for object sha1 has been set up, return the
|
|
* replacement object's name (replaced recursively, if necessary).
|
|
* The return value is either sha1 or a pointer to a
|
|
* permanently-allocated value. This function always respects replace
|
|
* references, regardless of the value of check_replace_refs.
|
|
*/
|
|
const unsigned char *do_lookup_replace_object(const unsigned char *sha1)
|
|
{
|
|
int pos, depth = MAXREPLACEDEPTH;
|
|
const unsigned char *cur = sha1;
|
|
|
|
prepare_replace_object();
|
|
|
|
/* Try to recursively replace the object */
|
|
do {
|
|
if (--depth < 0)
|
|
die("replace depth too high for object %s",
|
|
sha1_to_hex(sha1));
|
|
|
|
pos = replace_object_pos(cur);
|
|
if (0 <= pos)
|
|
cur = replace_object[pos]->replacement;
|
|
} while (0 <= pos);
|
|
|
|
return cur;
|
|
}
|