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Tip revision: 13d7ab6b5d7929825b626f050b62a11241ea4945 authored by Junio C Hamano on 09 March 2021, 00:09:43 UTC
Git 2.31-rc2
Git 2.31-rc2
Tip revision: 13d7ab6
replace-object.c
#include "cache.h"
#include "oidmap.h"
#include "object-store.h"
#include "replace-object.h"
#include "refs.h"
#include "repository.h"
#include "commit.h"
static int register_replace_ref(struct repository *r,
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 (get_oid_hex(hash, &repl_obj->original.oid)) {
free(repl_obj);
warning(_("bad replace ref name: %s"), refname);
return 0;
}
/* Copy sha1 from the read ref */
oidcpy(&repl_obj->replacement, oid);
/* Register new object */
if (oidmap_put(r->objects->replace_map, repl_obj))
die(_("duplicate replace ref: %s"), refname);
return 0;
}
void prepare_replace_object(struct repository *r)
{
if (r->objects->replace_map_initialized)
return;
pthread_mutex_lock(&r->objects->replace_mutex);
if (r->objects->replace_map_initialized) {
pthread_mutex_unlock(&r->objects->replace_mutex);
return;
}
r->objects->replace_map =
xmalloc(sizeof(*r->objects->replace_map));
oidmap_init(r->objects->replace_map, 0);
for_each_replace_ref(r, register_replace_ref, NULL);
r->objects->replace_map_initialized = 1;
pthread_mutex_unlock(&r->objects->replace_mutex);
}
/* We allow "recursive" replacement. Only within reason, though */
#define MAXREPLACEDEPTH 5
/*
* If a replacement for object oid has been set up, return the
* replacement object's name (replaced recursively, if necessary).
* The return value is either oid or a pointer to a
* permanently-allocated value. This function always respects replace
* references, regardless of the value of read_replace_refs.
*/
const struct object_id *do_lookup_replace_object(struct repository *r,
const struct object_id *oid)
{
int depth = MAXREPLACEDEPTH;
const struct object_id *cur = oid;
prepare_replace_object(r);
/* Try to recursively replace the object */
while (depth-- > 0) {
struct replace_object *repl_obj =
oidmap_get(r->objects->replace_map, cur);
if (!repl_obj)
return cur;
cur = &repl_obj->replacement;
}
die(_("replace depth too high for object %s"), oid_to_hex(oid));
}