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d88f9fdf SB |
1 | #ifndef REPLACE_OBJECT_H |
2 | #define REPLACE_OBJECT_H | |
3 | ||
47f351e9 SB |
4 | #include "oidmap.h" |
5 | #include "repository.h" | |
a034e910 | 6 | #include "object-store-ll.h" |
47f351e9 | 7 | |
d88f9fdf SB |
8 | struct replace_object { |
9 | struct oidmap_entry original; | |
10 | struct object_id replacement; | |
11 | }; | |
12 | ||
d6538246 DS |
13 | void prepare_replace_object(struct repository *r); |
14 | ||
47f351e9 SB |
15 | /* |
16 | * This internal function is only declared here for the benefit of | |
17 | * lookup_replace_object(). Please do not call it directly. | |
18 | */ | |
55454427 | 19 | const struct object_id *do_lookup_replace_object(struct repository *r, |
ad6dad09 | 20 | const struct object_id *oid); |
47f351e9 | 21 | |
f1178380 DS |
22 | /* |
23 | * Some commands disable replace-refs unconditionally, and otherwise each | |
24 | * repository could alter the core.useReplaceRefs config value. | |
25 | * | |
26 | * Return 1 if and only if all of the following are true: | |
27 | * | |
28 | * a. disable_replace_refs() has not been called. | |
29 | * b. GIT_NO_REPLACE_OBJECTS is unset or zero. | |
30 | * c. the given repository does not have core.useReplaceRefs=false. | |
31 | */ | |
32 | int replace_refs_enabled(struct repository *r); | |
33 | ||
47f351e9 SB |
34 | /* |
35 | * If object sha1 should be replaced, return the replacement object's | |
36 | * name (replaced recursively, if necessary). The return value is | |
37 | * either sha1 or a pointer to a permanently-allocated value. When | |
38 | * object replacement is suppressed, always return sha1. | |
b1fc9da1 MT |
39 | * |
40 | * Note: some thread debuggers might point a data race on the | |
41 | * replace_map_initialized reading in this function. However, we know there's no | |
42 | * problem in the value being updated by one thread right after another one read | |
43 | * it here (and it should be written to only once, anyway). | |
47f351e9 | 44 | */ |
90e777f1 SB |
45 | static inline const struct object_id *lookup_replace_object(struct repository *r, |
46 | const struct object_id *oid) | |
47f351e9 | 47 | { |
f1178380 | 48 | if (!replace_refs_enabled(r) || |
b1fc9da1 | 49 | (r->objects->replace_map_initialized && |
90e777f1 | 50 | r->objects->replace_map->map.tablesize == 0)) |
47f351e9 | 51 | return oid; |
90e777f1 | 52 | return do_lookup_replace_object(r, oid); |
47f351e9 SB |
53 | } |
54 | ||
d24eda4e DS |
55 | /* |
56 | * Some commands override config and environment settings for using | |
57 | * replace references. Use this method to disable the setting and ensure | |
58 | * those other settings will not override this choice. This applies | |
59 | * globally to all in-process repositories. | |
60 | */ | |
61 | void disable_replace_refs(void); | |
62 | ||
d88f9fdf | 63 | #endif /* REPLACE_OBJECT_H */ |