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#include "cache.h"
#include "oidmap.h"
#include "refs.h"
#include "commit.h"
struct replace_object {
struct oidmap_entry original;
struct object_id replacement;
};
static struct oidmap replace_map = OIDMAP_INIT;
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 (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(&replace_map, repl_obj))
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_map.map.tablesize)
check_replace_refs = 0;
}
/* 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 check_replace_refs.
*/
const struct object_id *do_lookup_replace_object(const struct object_id *oid)
{
int depth = MAXREPLACEDEPTH;
const struct object_id *cur = oid;
prepare_replace_object();
/* Try to recursively replace the object */
while (depth-- > 0) {
struct replace_object *repl_obj = oidmap_get(&replace_map, cur);
if (!repl_obj)
return cur;
cur = &repl_obj->replacement;
}
die("replace depth too high for object %s", oid_to_hex(oid));
}
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