commit.c: allow get_cached_commit_buffer to handle arbitrary repositories
[git/git.git] / commit.h
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1#ifndef COMMIT_H
2#define COMMIT_H
3
4#include "object.h"
5#include "tree.h"
674d1727 6#include "strbuf.h"
ca135e7a 7#include "decorate.h"
ffb6d7d5 8#include "gpg-interface.h"
a9080475 9#include "string-list.h"
cf394719 10#include "pretty.h"
6eb8ae00 11
177722b3 12#define COMMIT_NOT_FROM_GRAPH 0xFFFFFFFF
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13#define GENERATION_NUMBER_INFINITY 0xFFFFFFFF
14#define GENERATION_NUMBER_MAX 0x3FFFFFFF
15#define GENERATION_NUMBER_ZERO 0
177722b3 16
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17struct commit_list {
18 struct commit *item;
19 struct commit_list *next;
20};
21
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22/*
23 * The size of this struct matters in full repo walk operations like
24 * 'git clone' or 'git gc'. Consider using commit-slab to attach data
25 * to a commit instead of adding new fields here.
26 */
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27struct commit {
28 struct object object;
dddbad72 29 timestamp_t date;
6eb8ae00 30 struct commit_list *parents;
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31
32 /*
33 * If the commit is loaded from the commit-graph file, then this
34 * member may be NULL. Only access it through get_commit_tree()
35 * or get_commit_tree_oid().
36 */
891435d5 37 struct tree *maybe_tree;
177722b3 38 uint32_t graph_pos;
83073cc9 39 uint32_t generation;
25f859fd 40 unsigned int index;
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41};
42
60ab26de 43extern int save_commit_buffer;
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44extern const char *commit_type;
45
ca135e7a 46/* While we can decorate any object with a name, it's only used for commits.. */
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47struct name_decoration {
48 struct name_decoration *next;
eb3005e2 49 int type;
2e3dfb21 50 char name[FLEX_ARRAY];
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51};
52
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53enum decoration_type {
54 DECORATION_NONE = 0,
55 DECORATION_REF_LOCAL,
56 DECORATION_REF_REMOTE,
57 DECORATION_REF_TAG,
58 DECORATION_REF_STASH,
59 DECORATION_REF_HEAD,
60 DECORATION_GRAFTED,
61};
62
63void add_name_decoration(enum decoration_type type, const char *name, struct object *obj);
2608c249 64const struct name_decoration *get_name_decoration(const struct object *obj);
662174d2 65
bacf1687 66struct commit *lookup_commit(struct repository *r, const struct object_id *oid);
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67#define lookup_commit_reference(r, o) \
68 lookup_commit_reference_##r(o)
69struct commit *lookup_commit_reference_the_repository(const struct object_id *oid);
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70#define lookup_commit_reference_gently(r, o, q) \
71 lookup_commit_reference_gently_##r(o, q)
72struct commit *lookup_commit_reference_gently_the_repository(
73 const struct object_id *oid,
f76412ed 74 int quiet);
a6fa5992 75struct commit *lookup_commit_reference_by_name(const char *name);
6eb8ae00 76
baf18fc2 77/*
bc83266a 78 * Look up object named by "oid", dereference tag as necessary,
79 * get a commit and return it. If "oid" does not dereference to
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80 * a commit, use ref_name to report an error and die.
81 */
bc83266a 82struct commit *lookup_commit_or_die(const struct object_id *oid, const char *ref_name);
baf18fc2 83
fd8030c7 84int parse_commit_buffer(struct repository *r, struct commit *item, const void *buffer, unsigned long size, int check_graph);
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85int parse_commit_gently(struct commit *item, int quiet_on_missing);
86static inline int parse_commit(struct commit *item)
87{
88 return parse_commit_gently(item, 0);
89}
7059dccc 90void parse_commit_or_die(struct commit *item);
6eb8ae00 91
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92struct buffer_slab;
93struct buffer_slab *allocate_commit_buffer_slab(void);
94void free_commit_buffer_slab(struct buffer_slab *bs);
95
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96/*
97 * Associate an object buffer with the commit. The ownership of the
98 * memory is handed over to the commit, and must be free()-able.
99 */
1a40fc45 100void set_commit_buffer(struct repository *r, struct commit *, void *buffer, unsigned long size);
66c2827e 101
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102/*
103 * Get any cached object buffer associated with the commit. Returns NULL
104 * if none. The resulting memory should not be freed.
105 */
4ff7e5c9 106const void *get_cached_commit_buffer(struct repository *, const struct commit *, unsigned long *size);
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107
108/*
109 * Get the commit's object contents, either from cache or by reading the object
110 * from disk. The resulting memory should not be modified, and must be given
111 * to unuse_commit_buffer when the caller is done.
112 */
8597ea3a 113const void *get_commit_buffer(const struct commit *, unsigned long *size);
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114
115/*
116 * Tell the commit subsytem that we are done with a particular commit buffer.
117 * The commit and buffer should be the input and return value, respectively,
118 * from an earlier call to get_commit_buffer. The buffer may or may not be
119 * freed by this call; callers should not access the memory afterwards.
120 */
121void unuse_commit_buffer(const struct commit *, const void *buffer);
122
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123/*
124 * Free any cached object buffer associated with the commit.
125 */
126void free_commit_buffer(struct commit *);
127
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128struct tree *get_commit_tree(const struct commit *);
129struct object_id *get_commit_tree_oid(const struct commit *);
130
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131/*
132 * Release memory related to a commit, including the parent list and
133 * any cached object buffer.
134 */
135void release_commit_memory(struct commit *c);
136
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137/*
138 * Disassociate any cached object buffer from the commit, but do not free it.
139 * The buffer (or NULL, if none) is returned.
140 */
8597ea3a 141const void *detach_commit_buffer(struct commit *, unsigned long *sizep);
0fb370da 142
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143/* Find beginning and length of commit subject. */
144int find_commit_subject(const char *commit_buffer, const char **subject);
145
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146struct commit_list *commit_list_insert(struct commit *item,
147 struct commit_list **list);
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148struct commit_list **commit_list_append(struct commit *commit,
149 struct commit_list **next);
65319475 150unsigned commit_list_count(const struct commit_list *l);
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151struct commit_list *commit_list_insert_by_date(struct commit *item,
152 struct commit_list **list);
153void commit_list_sort_by_date(struct commit_list **list);
dd97f850 154
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155/* Shallow copy of the input list */
156struct commit_list *copy_commit_list(struct commit_list *list);
157
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158void free_commit_list(struct commit_list *list);
159
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160struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
161
28e9cf65 162extern int has_non_ascii(const char *text);
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163extern const char *logmsg_reencode(const struct commit *commit,
164 char **commit_encoding,
165 const char *output_encoding);
77356122 166extern const char *skip_blank_lines(const char *msg);
e3bc7a3b 167
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168/** Removes the first commit from a list sorted by date, and adds all
169 * of its parents.
170 **/
a6080a0a 171struct commit *pop_most_recent_commit(struct commit_list **list,
58e28af6 172 unsigned int mark);
dd97f850 173
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174struct commit *pop_commit(struct commit_list **stack);
175
f8f9c73c 176void clear_commit_marks(struct commit *commit, unsigned int mark);
e895cb51 177void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark);
f8f9c73c 178
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179
180enum rev_sort_order {
181 REV_SORT_IN_GRAPH_ORDER = 0,
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182 REV_SORT_BY_COMMIT_DATE,
183 REV_SORT_BY_AUTHOR_DATE
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184};
185
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186/*
187 * Performs an in-place topological sort of list supplied.
188 *
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189 * invariant of resulting list is:
190 * a reachable from b => ord(b) < ord(a)
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191 * sort_order further specifies:
192 * REV_SORT_IN_GRAPH_ORDER: try to show a commit on a single-parent
193 * chain together.
194 * REV_SORT_BY_COMMIT_DATE: show eligible commits in committer-date order.
ab580ace 195 */
08f704f2 196void sort_in_topological_order(struct commit_list **, enum rev_sort_order);
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197
198struct commit_graft {
7683e2e6 199 struct object_id oid;
ed09aef0 200 int nr_parent; /* < 0 if shallow commit */
7683e2e6 201 struct object_id parent[FLEX_ARRAY]; /* more */
5040f17e 202};
09d46644 203typedef int (*each_commit_graft_fn)(const struct commit_graft *, void *);
5040f17e 204
9a934032 205struct commit_graft *read_graft_line(struct strbuf *line);
a3b78e83 206int register_commit_graft(struct repository *r, struct commit_graft *, int);
b9dbddf6 207struct commit_graft *lookup_commit_graft(struct repository *r, const struct object_id *oid);
5040f17e 208
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209extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2);
210extern struct commit_list *get_merge_bases_many(struct commit *one, int n, struct commit **twos);
5240c9d7 211extern struct commit_list *get_octopus_merge_bases(struct commit_list *in);
7c6f8aaf 212
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213/* To be used only when object flags after this call no longer matter */
214extern struct commit_list *get_merge_bases_many_dirty(struct commit *one, int n, struct commit **twos);
215
41ccfdd9 216/* largest positive number a signed 32-bit integer can contain */
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217#define INFINITE_DEPTH 0x7fffffff
218
910650d2 219struct oid_array;
58babfff 220struct ref;
eee4502b 221extern int register_shallow(struct repository *r, const struct object_id *oid);
e92b848c 222extern int unregister_shallow(const struct object_id *oid);
09d46644 223extern int for_each_commit_graft(each_commit_graft_fn, void *);
eee4502b 224extern int is_repository_shallow(struct repository *r);
ed09aef0 225extern struct commit_list *get_shallow_commits(struct object_array *heads,
f53514bc 226 int depth, int shallow_flag, int not_shallow_flag);
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227extern struct commit_list *get_shallow_commits_by_rev_list(
228 int ac, const char **av, int shallow_flag, int not_shallow_flag);
eee4502b 229extern void set_alternate_shallow_file(struct repository *r, const char *path, int override);
1a30f5a2 230extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
910650d2 231 const struct oid_array *extra);
3125fe52 232extern void setup_alternate_shallow(struct lock_file *shallow_lock,
1a30f5a2 233 const char **alternate_shallow_file,
910650d2 234 const struct oid_array *extra);
235extern const char *setup_temporary_shallow(const struct oid_array *extra);
ad491366 236extern void advertise_shallow_grafts(int);
ed09aef0 237
58babfff 238struct shallow_info {
910650d2 239 struct oid_array *shallow;
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240 int *ours, nr_ours;
241 int *theirs, nr_theirs;
910650d2 242 struct oid_array *ref;
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243
244 /* for receive-pack */
245 uint32_t **used_shallow;
246 int *need_reachability_test;
247 int *reachable;
248 int *shallow_ref;
249 struct commit **commits;
250 int nr_commits;
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251};
252
910650d2 253extern void prepare_shallow_info(struct shallow_info *, struct oid_array *);
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254extern void clear_shallow_info(struct shallow_info *);
255extern void remove_nonexistent_theirs_shallow(struct shallow_info *);
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256extern void assign_shallow_commits_to_refs(struct shallow_info *info,
257 uint32_t **used,
258 int *ref_status);
0a1bc12b 259extern int delayed_reachability_test(struct shallow_info *si, int c);
eab3296c 260extern void prune_shallow(int show_only);
6aa30857 261extern struct trace_key trace_shallow;
ed09aef0 262
7fcdb36e 263int is_descendant_of(struct commit *, struct commit_list *);
a20efee9 264int in_merge_bases(struct commit *, struct commit *);
4c4b27e8 265int in_merge_bases_many(struct commit *, int, struct commit **);
58680165 266
b4bd4668 267extern int interactive_add(int argc, const char **argv, const char *prefix, int patch);
46b5139c 268extern int run_add_interactive(const char *revision, const char *patch_mode,
480ca644 269 const struct pathspec *pathspec);
58680165 270
4da72644
271/*
272 * Takes a list of commits and returns a new list where those
273 * have been removed that can be reached from other commits in
274 * the list. It is useful for, e.g., reducing the commits
275 * randomly thrown at the git-merge command and removing
276 * redundant commits that the user shouldn't have given to it.
277 *
278 * This function destroys the STALE bit of the commit objects'
279 * flags.
280 */
281extern struct commit_list *reduce_heads(struct commit_list *heads);
282
283/*
284 * Like `reduce_heads()`, except it replaces the list. Use this
285 * instead of `foo = reduce_heads(foo);` to avoid memory leaks.
286 */
287extern void reduce_heads_replace(struct commit_list **heads);
98cf9c3b 288
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289struct commit_extra_header {
290 struct commit_extra_header *next;
291 char *key;
292 char *value;
293 size_t len;
294};
295
296extern void append_merge_tag_headers(struct commit_list *parents,
297 struct commit_extra_header ***tail);
298
3ffefb54 299extern int commit_tree(const char *msg, size_t msg_len,
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300 const struct object_id *tree,
301 struct commit_list *parents, struct object_id *ret,
ba3c69a9 302 const char *author, const char *sign_commit);
5231c633 303
3ffefb54 304extern int commit_tree_extended(const char *msg, size_t msg_len,
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305 const struct object_id *tree,
306 struct commit_list *parents,
307 struct object_id *ret, const char *author,
308 const char *sign_commit,
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309 struct commit_extra_header *);
310
c871a1d1 311extern struct commit_extra_header *read_commit_extra_headers(struct commit *, const char **);
ed7a42a0 312
5231c633 313extern void free_commit_extra_headers(struct commit_extra_header *extra);
40d52ff7 314
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315/*
316 * Search the commit object contents given by "msg" for the header "key".
317 * Returns a pointer to the start of the header contents, or NULL. The length
318 * of the header, up to the first newline, is returned via out_len.
319 *
320 * Note that some headers (like mergetag) may be multi-line. It is the caller's
321 * responsibility to parse further in this case!
322 */
323extern const char *find_commit_header(const char *msg, const char *key,
324 size_t *out_len);
325
8c384589 326/* Find the end of the log message, the right place for a new trailer. */
710714aa 327extern int ignore_non_trailer(const char *buf, size_t len);
8c384589 328
fef461ea 329typedef int (*each_mergetag_fn)(struct commit *commit, struct commit_extra_header *extra,
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330 void *cb_data);
331
fef461ea 332extern int for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data);
063da62b 333
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334struct merge_remote_desc {
335 struct object *obj; /* the named object, could be a tag */
5447a76a 336 char name[FLEX_ARRAY];
ae8e4c9c 337};
e2e5ac23 338extern struct merge_remote_desc *merge_remote_util(struct commit *);
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339extern void set_merge_remote_desc(struct commit *commit,
340 const char *name, struct object *obj);
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341
342/*
343 * Given "name" from the command line to merge, find the commit object
344 * and return it, while storing merge_remote_desc in its ->util field,
345 * to allow callers to tell if we are told to merge a tag.
346 */
347struct commit *get_merge_parent(const char *name);
348
218aa3a6 349extern int parse_signed_commit(const struct commit *commit,
0c37f1fc 350 struct strbuf *message, struct strbuf *signature);
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351extern int remove_signature(struct strbuf *buf);
352
ffb6d7d5 353/*
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354 * Check the signature of the given commit. The result of the check is stored
355 * in sig->check_result, 'G' for a good signature, 'U' for a good signature
356 * from an untrusted signer, 'B' for a bad signature and 'N' for no signature
357 * at all. This may allocate memory for sig->gpg_output, sig->gpg_status,
358 * sig->signer and sig->key.
ffb6d7d5 359 */
434060ec 360extern int check_commit_signature(const struct commit *commit, struct signature_check *sigc);
ffb6d7d5 361
727377ff 362int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused);
3afc679b 363int compare_commits_by_gen_then_commit_date(const void *a_, const void *b_, void *unused);
727377ff 364
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365LAST_ARG_MUST_BE_NULL
366extern int run_commit_hook(int editor_is_used, const char *index_file, const char *name, ...);
367
6eb8ae00 368#endif /* COMMIT_H */