| 1 | #ifndef REPLACE_OBJECT_H |
| 2 | #define REPLACE_OBJECT_H |
| 3 | |
| 4 | #include "oidmap.h" |
| 5 | #include "repository.h" |
| 6 | #include "odb.h" |
| 7 | |
| 8 | struct replace_object { |
| 9 | struct oidmap_entry original; |
| 10 | struct object_id replacement; |
| 11 | }; |
| 12 | |
| 13 | void prepare_replace_object(struct repository *r); |
| 14 | |
| 15 | /* |
| 16 | * This internal function is only declared here for the benefit of |
| 17 | * lookup_replace_object(). Please do not call it directly. |
| 18 | */ |
| 19 | const struct object_id *do_lookup_replace_object(struct repository *r, |
| 20 | const struct object_id *oid); |
| 21 | |
| 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 | |
| 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. |
| 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). |
| 44 | */ |
| 45 | static inline const struct object_id *lookup_replace_object(struct repository *r, |
| 46 | const struct object_id *oid) |
| 47 | { |
| 48 | if (!replace_refs_enabled(r) || |
| 49 | (r->objects->replace_map_initialized && |
| 50 | oidmap_get_size(&r->objects->replace_map) == 0)) |
| 51 | return oid; |
| 52 | return do_lookup_replace_object(r, oid); |
| 53 | } |
| 54 | |
| 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 | |
| 63 | #endif /* REPLACE_OBJECT_H */ |