replace-object: move replace_map to object store
[git/git.git] / replace_object.c
CommitLineData
68095570 1#include "cache.h"
f37b9bc0 2#include "oidmap.h"
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3#include "object-store.h"
4#include "replace-object.h"
68095570 5#include "refs.h"
d88f9fdf 6#include "repository.h"
c2e86add 7#include "commit.h"
68095570 8
68095570 9static int register_replace_ref(const char *refname,
00530834 10 const struct object_id *oid,
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11 int flag, void *cb_data)
12{
13 /* Get sha1 from refname */
14 const char *slash = strrchr(refname, '/');
15 const char *hash = slash ? slash + 1 : refname;
16 struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj));
17
f37b9bc0 18 if (get_oid_hex(hash, &repl_obj->original.oid)) {
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19 free(repl_obj);
20 warning("bad replace ref name: %s", refname);
21 return 0;
22 }
23
24 /* Copy sha1 from the read ref */
1731a1e2 25 oidcpy(&repl_obj->replacement, oid);
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26
27 /* Register new object */
d88f9fdf 28 if (oidmap_put(&the_repository->objects->replace_map, repl_obj))
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29 die("duplicate replace ref: %s", refname);
30
31 return 0;
32}
33
34static void prepare_replace_object(void)
35{
36 static int replace_object_prepared;
37
38 if (replace_object_prepared)
39 return;
40
00530834 41 for_each_replace_ref(register_replace_ref, NULL);
68095570 42 replace_object_prepared = 1;
d88f9fdf 43 if (!the_repository->objects->replace_map.map.tablesize)
afc711b8 44 check_replace_refs = 0;
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45}
46
47/* We allow "recursive" replacement. Only within reason, though */
48#define MAXREPLACEDEPTH 5
49
1f91e79c 50/*
b383a13c 51 * If a replacement for object oid has been set up, return the
1f91e79c 52 * replacement object's name (replaced recursively, if necessary).
b383a13c 53 * The return value is either oid or a pointer to a
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54 * permanently-allocated value. This function always respects replace
55 * references, regardless of the value of check_replace_refs.
56 */
b383a13c 57const struct object_id *do_lookup_replace_object(const struct object_id *oid)
68095570 58{
f37b9bc0 59 int depth = MAXREPLACEDEPTH;
b383a13c 60 const struct object_id *cur = oid;
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61
62 prepare_replace_object();
63
64 /* Try to recursively replace the object */
f37b9bc0 65 while (depth-- > 0) {
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66 struct replace_object *repl_obj =
67 oidmap_get(&the_repository->objects->replace_map, cur);
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68 if (!repl_obj)
69 return cur;
70 cur = &repl_obj->replacement;
71 }
72 die("replace depth too high for object %s", oid_to_hex(oid));
68095570 73}