commit-graph: close under reachability
[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"
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11
12struct commit_list {
13 struct commit *item;
14 struct commit_list *next;
15};
16
17struct commit {
18 struct object object;
d3ff6f55 19 void *util;
96c4f4a3 20 unsigned int index;
dddbad72 21 timestamp_t date;
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22 struct commit_list *parents;
23 struct tree *tree;
24};
25
60ab26de 26extern int save_commit_buffer;
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27extern const char *commit_type;
28
ca135e7a 29/* While we can decorate any object with a name, it's only used for commits.. */
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30struct name_decoration {
31 struct name_decoration *next;
eb3005e2 32 int type;
2e3dfb21 33 char name[FLEX_ARRAY];
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34};
35
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36enum decoration_type {
37 DECORATION_NONE = 0,
38 DECORATION_REF_LOCAL,
39 DECORATION_REF_REMOTE,
40 DECORATION_REF_TAG,
41 DECORATION_REF_STASH,
42 DECORATION_REF_HEAD,
43 DECORATION_GRAFTED,
44};
45
46void add_name_decoration(enum decoration_type type, const char *name, struct object *obj);
2608c249 47const struct name_decoration *get_name_decoration(const struct object *obj);
662174d2 48
bc83266a 49struct commit *lookup_commit(const struct object_id *oid);
50struct commit *lookup_commit_reference(const struct object_id *oid);
51struct commit *lookup_commit_reference_gently(const struct object_id *oid,
f76412ed 52 int quiet);
a6fa5992 53struct commit *lookup_commit_reference_by_name(const char *name);
6eb8ae00 54
baf18fc2 55/*
bc83266a 56 * Look up object named by "oid", dereference tag as necessary,
57 * get a commit and return it. If "oid" does not dereference to
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58 * a commit, use ref_name to report an error and die.
59 */
bc83266a 60struct commit *lookup_commit_or_die(const struct object_id *oid, const char *ref_name);
baf18fc2 61
cf7b1cad 62int parse_commit_buffer(struct commit *item, const void *buffer, unsigned long size);
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63int parse_commit_gently(struct commit *item, int quiet_on_missing);
64static inline int parse_commit(struct commit *item)
65{
66 return parse_commit_gently(item, 0);
67}
7059dccc 68void parse_commit_or_die(struct commit *item);
6eb8ae00 69
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70/*
71 * Associate an object buffer with the commit. The ownership of the
72 * memory is handed over to the commit, and must be free()-able.
73 */
8597ea3a 74void set_commit_buffer(struct commit *, void *buffer, unsigned long size);
66c2827e 75
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76/*
77 * Get any cached object buffer associated with the commit. Returns NULL
78 * if none. The resulting memory should not be freed.
79 */
8597ea3a 80const void *get_cached_commit_buffer(const struct commit *, unsigned long *size);
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81
82/*
83 * Get the commit's object contents, either from cache or by reading the object
84 * from disk. The resulting memory should not be modified, and must be given
85 * to unuse_commit_buffer when the caller is done.
86 */
8597ea3a 87const void *get_commit_buffer(const struct commit *, unsigned long *size);
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88
89/*
90 * Tell the commit subsytem that we are done with a particular commit buffer.
91 * The commit and buffer should be the input and return value, respectively,
92 * from an earlier call to get_commit_buffer. The buffer may or may not be
93 * freed by this call; callers should not access the memory afterwards.
94 */
95void unuse_commit_buffer(const struct commit *, const void *buffer);
96
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97/*
98 * Free any cached object buffer associated with the commit.
99 */
100void free_commit_buffer(struct commit *);
101
102/*
103 * Disassociate any cached object buffer from the commit, but do not free it.
104 * The buffer (or NULL, if none) is returned.
105 */
8597ea3a 106const void *detach_commit_buffer(struct commit *, unsigned long *sizep);
0fb370da 107
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108/* Find beginning and length of commit subject. */
109int find_commit_subject(const char *commit_buffer, const char **subject);
110
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111struct commit_list *commit_list_insert(struct commit *item,
112 struct commit_list **list);
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113struct commit_list **commit_list_append(struct commit *commit,
114 struct commit_list **next);
65319475 115unsigned commit_list_count(const struct commit_list *l);
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116struct commit_list *commit_list_insert_by_date(struct commit *item,
117 struct commit_list **list);
118void commit_list_sort_by_date(struct commit_list **list);
dd97f850 119
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120/* Shallow copy of the input list */
121struct commit_list *copy_commit_list(struct commit_list *list);
122
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123void free_commit_list(struct commit_list *list);
124
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125struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
126
28e9cf65 127extern int has_non_ascii(const char *text);
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128extern const char *logmsg_reencode(const struct commit *commit,
129 char **commit_encoding,
130 const char *output_encoding);
77356122 131extern const char *skip_blank_lines(const char *msg);
e3bc7a3b 132
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133/** Removes the first commit from a list sorted by date, and adds all
134 * of its parents.
135 **/
a6080a0a 136struct commit *pop_most_recent_commit(struct commit_list **list,
58e28af6 137 unsigned int mark);
dd97f850 138
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139struct commit *pop_commit(struct commit_list **stack);
140
f8f9c73c 141void clear_commit_marks(struct commit *commit, unsigned int mark);
e895cb51 142void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark);
f8f9c73c 143
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144
145enum rev_sort_order {
146 REV_SORT_IN_GRAPH_ORDER = 0,
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147 REV_SORT_BY_COMMIT_DATE,
148 REV_SORT_BY_AUTHOR_DATE
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149};
150
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151/*
152 * Performs an in-place topological sort of list supplied.
153 *
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154 * invariant of resulting list is:
155 * a reachable from b => ord(b) < ord(a)
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156 * sort_order further specifies:
157 * REV_SORT_IN_GRAPH_ORDER: try to show a commit on a single-parent
158 * chain together.
159 * REV_SORT_BY_COMMIT_DATE: show eligible commits in committer-date order.
ab580ace 160 */
08f704f2 161void sort_in_topological_order(struct commit_list **, enum rev_sort_order);
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162
163struct commit_graft {
7683e2e6 164 struct object_id oid;
ed09aef0 165 int nr_parent; /* < 0 if shallow commit */
7683e2e6 166 struct object_id parent[FLEX_ARRAY]; /* more */
5040f17e 167};
09d46644 168typedef int (*each_commit_graft_fn)(const struct commit_graft *, void *);
5040f17e 169
9a934032 170struct commit_graft *read_graft_line(struct strbuf *line);
5040f17e 171int register_commit_graft(struct commit_graft *, int);
8b65a34c 172struct commit_graft *lookup_commit_graft(const struct object_id *oid);
5040f17e 173
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174extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2);
175extern struct commit_list *get_merge_bases_many(struct commit *one, int n, struct commit **twos);
5240c9d7 176extern struct commit_list *get_octopus_merge_bases(struct commit_list *in);
7c6f8aaf 177
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178/* To be used only when object flags after this call no longer matter */
179extern struct commit_list *get_merge_bases_many_dirty(struct commit *one, int n, struct commit **twos);
180
41ccfdd9 181/* largest positive number a signed 32-bit integer can contain */
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182#define INFINITE_DEPTH 0x7fffffff
183
910650d2 184struct oid_array;
58babfff 185struct ref;
e92b848c 186extern int register_shallow(const struct object_id *oid);
187extern int unregister_shallow(const struct object_id *oid);
09d46644 188extern int for_each_commit_graft(each_commit_graft_fn, void *);
f43117a6 189extern int is_repository_shallow(void);
ed09aef0 190extern struct commit_list *get_shallow_commits(struct object_array *heads,
f53514bc 191 int depth, int shallow_flag, int not_shallow_flag);
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192extern struct commit_list *get_shallow_commits_by_rev_list(
193 int ac, const char **av, int shallow_flag, int not_shallow_flag);
069c0532 194extern void set_alternate_shallow_file(const char *path, int override);
1a30f5a2 195extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
910650d2 196 const struct oid_array *extra);
3125fe52 197extern void setup_alternate_shallow(struct lock_file *shallow_lock,
1a30f5a2 198 const char **alternate_shallow_file,
910650d2 199 const struct oid_array *extra);
200extern const char *setup_temporary_shallow(const struct oid_array *extra);
ad491366 201extern void advertise_shallow_grafts(int);
ed09aef0 202
58babfff 203struct shallow_info {
910650d2 204 struct oid_array *shallow;
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205 int *ours, nr_ours;
206 int *theirs, nr_theirs;
910650d2 207 struct oid_array *ref;
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208
209 /* for receive-pack */
210 uint32_t **used_shallow;
211 int *need_reachability_test;
212 int *reachable;
213 int *shallow_ref;
214 struct commit **commits;
215 int nr_commits;
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216};
217
910650d2 218extern void prepare_shallow_info(struct shallow_info *, struct oid_array *);
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219extern void clear_shallow_info(struct shallow_info *);
220extern void remove_nonexistent_theirs_shallow(struct shallow_info *);
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221extern void assign_shallow_commits_to_refs(struct shallow_info *info,
222 uint32_t **used,
223 int *ref_status);
0a1bc12b 224extern int delayed_reachability_test(struct shallow_info *si, int c);
eab3296c 225extern void prune_shallow(int show_only);
6aa30857 226extern struct trace_key trace_shallow;
ed09aef0 227
7fcdb36e 228int is_descendant_of(struct commit *, struct commit_list *);
a20efee9 229int in_merge_bases(struct commit *, struct commit *);
4c4b27e8 230int in_merge_bases_many(struct commit *, int, struct commit **);
58680165 231
b4bd4668 232extern int interactive_add(int argc, const char **argv, const char *prefix, int patch);
46b5139c 233extern int run_add_interactive(const char *revision, const char *patch_mode,
480ca644 234 const struct pathspec *pathspec);
58680165 235
4da72644
236/*
237 * Takes a list of commits and returns a new list where those
238 * have been removed that can be reached from other commits in
239 * the list. It is useful for, e.g., reducing the commits
240 * randomly thrown at the git-merge command and removing
241 * redundant commits that the user shouldn't have given to it.
242 *
243 * This function destroys the STALE bit of the commit objects'
244 * flags.
245 */
246extern struct commit_list *reduce_heads(struct commit_list *heads);
247
248/*
249 * Like `reduce_heads()`, except it replaces the list. Use this
250 * instead of `foo = reduce_heads(foo);` to avoid memory leaks.
251 */
252extern void reduce_heads_replace(struct commit_list **heads);
98cf9c3b 253
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254struct commit_extra_header {
255 struct commit_extra_header *next;
256 char *key;
257 char *value;
258 size_t len;
259};
260
261extern void append_merge_tag_headers(struct commit_list *parents,
262 struct commit_extra_header ***tail);
263
3ffefb54 264extern int commit_tree(const char *msg, size_t msg_len,
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265 const struct object_id *tree,
266 struct commit_list *parents, struct object_id *ret,
ba3c69a9 267 const char *author, const char *sign_commit);
5231c633 268
3ffefb54 269extern int commit_tree_extended(const char *msg, size_t msg_len,
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270 const struct object_id *tree,
271 struct commit_list *parents,
272 struct object_id *ret, const char *author,
273 const char *sign_commit,
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274 struct commit_extra_header *);
275
c871a1d1 276extern struct commit_extra_header *read_commit_extra_headers(struct commit *, const char **);
ed7a42a0 277
5231c633 278extern void free_commit_extra_headers(struct commit_extra_header *extra);
40d52ff7 279
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280/*
281 * Search the commit object contents given by "msg" for the header "key".
282 * Returns a pointer to the start of the header contents, or NULL. The length
283 * of the header, up to the first newline, is returned via out_len.
284 *
285 * Note that some headers (like mergetag) may be multi-line. It is the caller's
286 * responsibility to parse further in this case!
287 */
288extern const char *find_commit_header(const char *msg, const char *key,
289 size_t *out_len);
290
8c384589 291/* Find the end of the log message, the right place for a new trailer. */
710714aa 292extern int ignore_non_trailer(const char *buf, size_t len);
8c384589 293
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294typedef void (*each_mergetag_fn)(struct commit *commit, struct commit_extra_header *extra,
295 void *cb_data);
296
297extern void for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data);
298
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299struct merge_remote_desc {
300 struct object *obj; /* the named object, could be a tag */
5447a76a 301 char name[FLEX_ARRAY];
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302};
303#define merge_remote_util(commit) ((struct merge_remote_desc *)((commit)->util))
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304extern void set_merge_remote_desc(struct commit *commit,
305 const char *name, struct object *obj);
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306
307/*
308 * Given "name" from the command line to merge, find the commit object
309 * and return it, while storing merge_remote_desc in its ->util field,
310 * to allow callers to tell if we are told to merge a tag.
311 */
312struct commit *get_merge_parent(const char *name);
313
218aa3a6 314extern int parse_signed_commit(const struct commit *commit,
0c37f1fc 315 struct strbuf *message, struct strbuf *signature);
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316extern int remove_signature(struct strbuf *buf);
317
ffb6d7d5 318/*
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319 * Check the signature of the given commit. The result of the check is stored
320 * in sig->check_result, 'G' for a good signature, 'U' for a good signature
321 * from an untrusted signer, 'B' for a bad signature and 'N' for no signature
322 * at all. This may allocate memory for sig->gpg_output, sig->gpg_status,
323 * sig->signer and sig->key.
ffb6d7d5 324 */
434060ec 325extern int check_commit_signature(const struct commit *commit, struct signature_check *sigc);
ffb6d7d5 326
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327int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused);
328
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329LAST_ARG_MUST_BE_NULL
330extern int run_commit_hook(int editor_is_used, const char *index_file, const char *name, ...);
331
6eb8ae00 332#endif /* COMMIT_H */