commit.h

   1 #ifndef COMMIT_H
   2 #define COMMIT_H
   3
   4 #include "object.h"
   5 #include "tree.h"
   6 #include "strbuf.h"
   7 #include "decorate.h"
   8 #include "gpg-interface.h"
   9 #include "string-list.h"
  10
  11 struct commit_list {
  12         struct commit *item;
  13         struct commit_list *next;
  14 };
  15
  16 struct commit {
  17         struct object object;
  18         void *util;
  19         unsigned int index;
  20         unsigned long date;
  21         struct commit_list *parents;
  22         struct tree *tree;
  23 };
  24
  25 extern int save_commit_buffer;
  26 extern const char *commit_type;
  27
  28 /* While we can decorate any object with a name, it's only used for commits.. */
  29 struct name_decoration {
  30         struct name_decoration *next;
  31         int type;
  32         char name[FLEX_ARRAY];
  33 };
  34
  35 enum decoration_type {
  36         DECORATION_NONE = 0,
  37         DECORATION_REF_LOCAL,
  38         DECORATION_REF_REMOTE,
  39         DECORATION_REF_TAG,
  40         DECORATION_REF_STASH,
  41         DECORATION_REF_HEAD,
  42         DECORATION_GRAFTED,
  43 };
  44
  45 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj);
  46 const struct name_decoration *get_name_decoration(const struct object *obj);
  47
  48 struct commit *lookup_commit(const unsigned char *sha1);
  49 struct commit *lookup_commit_reference(const unsigned char *sha1);
  50 struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
  51                                               int quiet);
  52 struct commit *lookup_commit_reference_by_name(const char *name);
  53
  54 /*
  55  * Look up object named by "sha1", dereference tag as necessary,
  56  * get a commit and return it. If "sha1" does not dereference to
  57  * a commit, use ref_name to report an error and die.
  58  */
  59 struct commit *lookup_commit_or_die(const unsigned char *sha1, const char *ref_name);
  60
  61 int parse_commit_buffer(struct commit *item, const void *buffer, unsigned long size);
  62 int parse_commit_gently(struct commit *item, int quiet_on_missing);
  63 static inline int parse_commit(struct commit *item)
  64 {
  65         return parse_commit_gently(item, 0);
  66 }
  67 void parse_commit_or_die(struct commit *item);
  68
  69 /*
  70  * Associate an object buffer with the commit. The ownership of the
  71  * memory is handed over to the commit, and must be free()-able.
  72  */
  73 void set_commit_buffer(struct commit *, void *buffer, unsigned long size);
  74
  75 /*
  76  * Get any cached object buffer associated with the commit. Returns NULL
  77  * if none. The resulting memory should not be freed.
  78  */
  79 const void *get_cached_commit_buffer(const struct commit *, unsigned long *size);
  80
  81 /*
  82  * Get the commit's object contents, either from cache or by reading the object
  83  * from disk. The resulting memory should not be modified, and must be given
  84  * to unuse_commit_buffer when the caller is done.
  85  */
  86 const void *get_commit_buffer(const struct commit *, unsigned long *size);
  87
  88 /*
  89  * Tell the commit subsytem that we are done with a particular commit buffer.
  90  * The commit and buffer should be the input and return value, respectively,
  91  * from an earlier call to get_commit_buffer.  The buffer may or may not be
  92  * freed by this call; callers should not access the memory afterwards.
  93  */
  94 void unuse_commit_buffer(const struct commit *, const void *buffer);
  95
  96 /*
  97  * Free any cached object buffer associated with the commit.
  98  */
  99 void free_commit_buffer(struct commit *);
 100
 101 /*
 102  * Disassociate any cached object buffer from the commit, but do not free it.
 103  * The buffer (or NULL, if none) is returned.
 104  */
 105 const void *detach_commit_buffer(struct commit *, unsigned long *sizep);
 106
 107 /* Find beginning and length of commit subject. */
 108 int find_commit_subject(const char *commit_buffer, const char **subject);
 109
 110 struct commit_list *commit_list_insert(struct commit *item,
 111                                         struct commit_list **list);
 112 struct commit_list **commit_list_append(struct commit *commit,
 113                                         struct commit_list **next);
 114 unsigned commit_list_count(const struct commit_list *l);
 115 struct commit_list *commit_list_insert_by_date(struct commit *item,
 116                                     struct commit_list **list);
 117 void commit_list_sort_by_date(struct commit_list **list);
 118
 119 /* Shallow copy of the input list */
 120 struct commit_list *copy_commit_list(struct commit_list *list);
 121
 122 void free_commit_list(struct commit_list *list);
 123
 124 /* Commit formats */
 125 enum cmit_fmt {
 126         CMIT_FMT_RAW,
 127         CMIT_FMT_MEDIUM,
 128         CMIT_FMT_DEFAULT = CMIT_FMT_MEDIUM,
 129         CMIT_FMT_SHORT,
 130         CMIT_FMT_FULL,
 131         CMIT_FMT_FULLER,
 132         CMIT_FMT_ONELINE,
 133         CMIT_FMT_EMAIL,
 134         CMIT_FMT_USERFORMAT,
 135
 136         CMIT_FMT_UNSPECIFIED
 137 };
 138
 139 struct pretty_print_context {
 140         /*
 141          * Callers should tweak these to change the behavior of pp_* functions.
 142          */
 143         enum cmit_fmt fmt;
 144         int abbrev;
 145         const char *subject;
 146         const char *after_subject;
 147         int preserve_subject;
 148         struct date_mode date_mode;
 149         unsigned date_mode_explicit:1;
 150         int expand_tabs_in_log;
 151         int need_8bit_cte;
 152         char *notes_message;
 153         struct reflog_walk_info *reflog_info;
 154         const char *output_encoding;
 155         struct string_list *mailmap;
 156         int color;
 157         struct ident_split *from_ident;
 158
 159         /*
 160          * Fields below here are manipulated internally by pp_* functions and
 161          * should not be counted on by callers.
 162          */
 163         struct string_list in_body_headers;
 164 };
 165
 166 struct userformat_want {
 167         unsigned notes:1;
 168 };
 169
 170 extern int has_non_ascii(const char *text);
 171 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 172 extern const char *logmsg_reencode(const struct commit *commit,
 173                                    char **commit_encoding,
 174                                    const char *output_encoding);
 175 extern void get_commit_format(const char *arg, struct rev_info *);
 176 extern const char *format_subject(struct strbuf *sb, const char *msg,
 177                                   const char *line_separator);
 178 extern void userformat_find_requirements(const char *fmt, struct userformat_want *w);
 179 extern int commit_format_is_empty(enum cmit_fmt);
 180 extern void format_commit_message(const struct commit *commit,
 181                                   const char *format, struct strbuf *sb,
 182                                   const struct pretty_print_context *context);
 183 extern void pretty_print_commit(struct pretty_print_context *pp,
 184                                 const struct commit *commit,
 185                                 struct strbuf *sb);
 186 extern void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
 187                            struct strbuf *sb);
 188 void pp_user_info(struct pretty_print_context *pp,
 189                   const char *what, struct strbuf *sb,
 190                   const char *line, const char *encoding);
 191 void pp_title_line(struct pretty_print_context *pp,
 192                    const char **msg_p,
 193                    struct strbuf *sb,
 194                    const char *encoding,
 195                    int need_8bit_cte);
 196 void pp_remainder(struct pretty_print_context *pp,
 197                   const char **msg_p,
 198                   struct strbuf *sb,
 199                   int indent);
 200
 201
 202 /** Removes the first commit from a list sorted by date, and adds all
 203  * of its parents.
 204  **/
 205 struct commit *pop_most_recent_commit(struct commit_list **list,
 206                                       unsigned int mark);
 207
 208 struct commit *pop_commit(struct commit_list **stack);
 209
 210 void clear_commit_marks(struct commit *commit, unsigned int mark);
 211 void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark);
 212 void clear_commit_marks_for_object_array(struct object_array *a, unsigned mark);
 213
 214
 215 enum rev_sort_order {
 216         REV_SORT_IN_GRAPH_ORDER = 0,
 217         REV_SORT_BY_COMMIT_DATE,
 218         REV_SORT_BY_AUTHOR_DATE
 219 };
 220
 221 /*
 222  * Performs an in-place topological sort of list supplied.
 223  *
 224  *   invariant of resulting list is:
 225  *      a reachable from b => ord(b) < ord(a)
 226  *   sort_order further specifies:
 227  *   REV_SORT_IN_GRAPH_ORDER: try to show a commit on a single-parent
 228  *                            chain together.
 229  *   REV_SORT_BY_COMMIT_DATE: show eligible commits in committer-date order.
 230  */
 231 void sort_in_topological_order(struct commit_list **, enum rev_sort_order);
 232
 233 struct commit_graft {
 234         struct object_id oid;
 235         int nr_parent; /* < 0 if shallow commit */
 236         struct object_id parent[FLEX_ARRAY]; /* more */
 237 };
 238 typedef int (*each_commit_graft_fn)(const struct commit_graft *, void *);
 239
 240 struct commit_graft *read_graft_line(char *buf, int len);
 241 int register_commit_graft(struct commit_graft *, int);
 242 struct commit_graft *lookup_commit_graft(const unsigned char *sha1);
 243
 244 extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2);
 245 extern struct commit_list *get_merge_bases_many(struct commit *one, int n, struct commit **twos);
 246 extern struct commit_list *get_octopus_merge_bases(struct commit_list *in);
 247
 248 /* To be used only when object flags after this call no longer matter */
 249 extern struct commit_list *get_merge_bases_many_dirty(struct commit *one, int n, struct commit **twos);
 250
 251 /* largest positive number a signed 32-bit integer can contain */
 252 #define INFINITE_DEPTH 0x7fffffff
 253
 254 struct sha1_array;
 255 struct ref;
 256 extern int register_shallow(const unsigned char *sha1);
 257 extern int unregister_shallow(const unsigned char *sha1);
 258 extern int for_each_commit_graft(each_commit_graft_fn, void *);
 259 extern int is_repository_shallow(void);
 260 extern struct commit_list *get_shallow_commits(struct object_array *heads,
 261                 int depth, int shallow_flag, int not_shallow_flag);
 262 extern void set_alternate_shallow_file(const char *path, int override);
 263 extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
 264                                  const struct sha1_array *extra);
 265 extern void setup_alternate_shallow(struct lock_file *shallow_lock,
 266                                     const char **alternate_shallow_file,
 267                                     const struct sha1_array *extra);
 268 extern const char *setup_temporary_shallow(const struct sha1_array *extra);
 269 extern void advertise_shallow_grafts(int);
 270
 271 struct shallow_info {
 272         struct sha1_array *shallow;
 273         int *ours, nr_ours;
 274         int *theirs, nr_theirs;
 275         struct sha1_array *ref;
 276
 277         /* for receive-pack */
 278         uint32_t **used_shallow;
 279         int *need_reachability_test;
 280         int *reachable;
 281         int *shallow_ref;
 282         struct commit **commits;
 283         int nr_commits;
 284 };
 285
 286 extern void prepare_shallow_info(struct shallow_info *, struct sha1_array *);
 287 extern void clear_shallow_info(struct shallow_info *);
 288 extern void remove_nonexistent_theirs_shallow(struct shallow_info *);
 289 extern void assign_shallow_commits_to_refs(struct shallow_info *info,
 290                                            uint32_t **used,
 291                                            int *ref_status);
 292 extern int delayed_reachability_test(struct shallow_info *si, int c);
 293 extern void prune_shallow(int show_only);
 294 extern struct trace_key trace_shallow;
 295
 296 int is_descendant_of(struct commit *, struct commit_list *);
 297 int in_merge_bases(struct commit *, struct commit *);
 298 int in_merge_bases_many(struct commit *, int, struct commit **);
 299
 300 extern int interactive_add(int argc, const char **argv, const char *prefix, int patch);
 301 extern int run_add_interactive(const char *revision, const char *patch_mode,
 302                                const struct pathspec *pathspec);
 303
 304 static inline int single_parent(struct commit *commit)
 305 {
 306         return commit->parents && !commit->parents->next;
 307 }
 308
 309 struct commit_list *reduce_heads(struct commit_list *heads);
 310
 311 struct commit_extra_header {
 312         struct commit_extra_header *next;
 313         char *key;
 314         char *value;
 315         size_t len;
 316 };
 317
 318 extern void append_merge_tag_headers(struct commit_list *parents,
 319                                      struct commit_extra_header ***tail);
 320
 321 extern int commit_tree(const char *msg, size_t msg_len,
 322                        const unsigned char *tree,
 323                        struct commit_list *parents, unsigned char *ret,
 324                        const char *author, const char *sign_commit);
 325
 326 extern int commit_tree_extended(const char *msg, size_t msg_len,
 327                                 const unsigned char *tree,
 328                                 struct commit_list *parents, unsigned char *ret,
 329                                 const char *author, const char *sign_commit,
 330                                 struct commit_extra_header *);
 331
 332 extern struct commit_extra_header *read_commit_extra_headers(struct commit *, const char **);
 333
 334 extern void free_commit_extra_headers(struct commit_extra_header *extra);
 335
 336 /*
 337  * Search the commit object contents given by "msg" for the header "key".
 338  * Returns a pointer to the start of the header contents, or NULL. The length
 339  * of the header, up to the first newline, is returned via out_len.
 340  *
 341  * Note that some headers (like mergetag) may be multi-line. It is the caller's
 342  * responsibility to parse further in this case!
 343  */
 344 extern const char *find_commit_header(const char *msg, const char *key,
 345                                       size_t *out_len);
 346
 347 /* Find the end of the log message, the right place for a new trailer. */
 348 extern int ignore_non_trailer(struct strbuf *sb);
 349
 350 typedef void (*each_mergetag_fn)(struct commit *commit, struct commit_extra_header *extra,
 351                                  void *cb_data);
 352
 353 extern void for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data);
 354
 355 struct merge_remote_desc {
 356         struct object *obj; /* the named object, could be a tag */
 357         const char *name;
 358 };
 359 #define merge_remote_util(commit) ((struct merge_remote_desc *)((commit)->util))
 360
 361 /*
 362  * Given "name" from the command line to merge, find the commit object
 363  * and return it, while storing merge_remote_desc in its ->util field,
 364  * to allow callers to tell if we are told to merge a tag.
 365  */
 366 struct commit *get_merge_parent(const char *name);
 367
 368 extern int parse_signed_commit(const struct commit *commit,
 369                                struct strbuf *message, struct strbuf *signature);
 370 extern int remove_signature(struct strbuf *buf);
 371
 372 extern void print_commit_list(struct commit_list *list,
 373                               const char *format_cur,
 374                               const char *format_last);
 375
 376 /*
 377  * Check the signature of the given commit. The result of the check is stored
 378  * in sig->check_result, 'G' for a good signature, 'U' for a good signature
 379  * from an untrusted signer, 'B' for a bad signature and 'N' for no signature
 380  * at all.  This may allocate memory for sig->gpg_output, sig->gpg_status,
 381  * sig->signer and sig->key.
 382  */
 383 extern int check_commit_signature(const struct commit *commit, struct signature_check *sigc);
 384
 385 int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused);
 386
 387 LAST_ARG_MUST_BE_NULL
 388 extern int run_commit_hook(int editor_is_used, const char *index_file, const char *name, ...);
 389
 390 #endif /* COMMIT_H */