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         timestamp_t 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 struct object_id *oid);
  49 struct commit *lookup_commit_reference(const struct object_id *oid);
  50 struct commit *lookup_commit_reference_gently(const struct object_id *oid,
  51                                               int quiet);
  52 struct commit *lookup_commit_reference_by_name(const char *name);
  53
  54 /*
  55  * Look up object named by "oid", dereference tag as necessary,
  56  * get a commit and return it. If "oid" 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 struct object_id *oid, 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_MBOXRD,
 135         CMIT_FMT_USERFORMAT,
 136
 137         CMIT_FMT_UNSPECIFIED
 138 };
 139
 140 static inline int cmit_fmt_is_mail(enum cmit_fmt fmt)
 141 {
 142         return (fmt == CMIT_FMT_EMAIL || fmt == CMIT_FMT_MBOXRD);
 143 }
 144
 145 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 146
 147 struct pretty_print_context {
 148         /*
 149          * Callers should tweak these to change the behavior of pp_* functions.
 150          */
 151         enum cmit_fmt fmt;
 152         int abbrev;
 153         const char *after_subject;
 154         int preserve_subject;
 155         struct date_mode date_mode;
 156         unsigned date_mode_explicit:1;
 157         int print_email_subject;
 158         int expand_tabs_in_log;
 159         int need_8bit_cte;
 160         char *notes_message;
 161         struct reflog_walk_info *reflog_info;
 162         struct rev_info *rev;
 163         const char *output_encoding;
 164         struct string_list *mailmap;
 165         int color;
 166         struct ident_split *from_ident;
 167
 168         /*
 169          * Fields below here are manipulated internally by pp_* functions and
 170          * should not be counted on by callers.
 171          */
 172         struct string_list in_body_headers;
 173         int graph_width;
 174 };
 175
 176 struct userformat_want {
 177         unsigned notes:1;
 178 };
 179
 180 extern int has_non_ascii(const char *text);
 181 extern const char *logmsg_reencode(const struct commit *commit,
 182                                    char **commit_encoding,
 183                                    const char *output_encoding);
 184 extern void get_commit_format(const char *arg, struct rev_info *);
 185 extern const char *format_subject(struct strbuf *sb, const char *msg,
 186                                   const char *line_separator);
 187 extern void userformat_find_requirements(const char *fmt, struct userformat_want *w);
 188 extern int commit_format_is_empty(enum cmit_fmt);
 189 extern const char *skip_blank_lines(const char *msg);
 190 extern void format_commit_message(const struct commit *commit,
 191                                   const char *format, struct strbuf *sb,
 192                                   const struct pretty_print_context *context);
 193 extern void pretty_print_commit(struct pretty_print_context *pp,
 194                                 const struct commit *commit,
 195                                 struct strbuf *sb);
 196 extern void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
 197                            struct strbuf *sb);
 198 void pp_user_info(struct pretty_print_context *pp,
 199                   const char *what, struct strbuf *sb,
 200                   const char *line, const char *encoding);
 201 void pp_title_line(struct pretty_print_context *pp,
 202                    const char **msg_p,
 203                    struct strbuf *sb,
 204                    const char *encoding,
 205                    int need_8bit_cte);
 206 void pp_remainder(struct pretty_print_context *pp,
 207                   const char **msg_p,
 208                   struct strbuf *sb,
 209                   int indent);
 210
 211
 212 /** Removes the first commit from a list sorted by date, and adds all
 213  * of its parents.
 214  **/
 215 struct commit *pop_most_recent_commit(struct commit_list **list,
 216                                       unsigned int mark);
 217
 218 struct commit *pop_commit(struct commit_list **stack);
 219
 220 void clear_commit_marks(struct commit *commit, unsigned int mark);
 221 void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark);
 222 void clear_commit_marks_for_object_array(struct object_array *a, unsigned mark);
 223
 224
 225 enum rev_sort_order {
 226         REV_SORT_IN_GRAPH_ORDER = 0,
 227         REV_SORT_BY_COMMIT_DATE,
 228         REV_SORT_BY_AUTHOR_DATE
 229 };
 230
 231 /*
 232  * Performs an in-place topological sort of list supplied.
 233  *
 234  *   invariant of resulting list is:
 235  *      a reachable from b => ord(b) < ord(a)
 236  *   sort_order further specifies:
 237  *   REV_SORT_IN_GRAPH_ORDER: try to show a commit on a single-parent
 238  *                            chain together.
 239  *   REV_SORT_BY_COMMIT_DATE: show eligible commits in committer-date order.
 240  */
 241 void sort_in_topological_order(struct commit_list **, enum rev_sort_order);
 242
 243 struct commit_graft {
 244         struct object_id oid;
 245         int nr_parent; /* < 0 if shallow commit */
 246         struct object_id parent[FLEX_ARRAY]; /* more */
 247 };
 248 typedef int (*each_commit_graft_fn)(const struct commit_graft *, void *);
 249
 250 struct commit_graft *read_graft_line(struct strbuf *line);
 251 int register_commit_graft(struct commit_graft *, int);
 252 struct commit_graft *lookup_commit_graft(const struct object_id *oid);
 253
 254 extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2);
 255 extern struct commit_list *get_merge_bases_many(struct commit *one, int n, struct commit **twos);
 256 extern struct commit_list *get_octopus_merge_bases(struct commit_list *in);
 257
 258 /* To be used only when object flags after this call no longer matter */
 259 extern struct commit_list *get_merge_bases_many_dirty(struct commit *one, int n, struct commit **twos);
 260
 261 /* largest positive number a signed 32-bit integer can contain */
 262 #define INFINITE_DEPTH 0x7fffffff
 263
 264 struct oid_array;
 265 struct ref;
 266 extern int register_shallow(const struct object_id *oid);
 267 extern int unregister_shallow(const struct object_id *oid);
 268 extern int for_each_commit_graft(each_commit_graft_fn, void *);
 269 extern int is_repository_shallow(void);
 270 extern struct commit_list *get_shallow_commits(struct object_array *heads,
 271                 int depth, int shallow_flag, int not_shallow_flag);
 272 extern struct commit_list *get_shallow_commits_by_rev_list(
 273                 int ac, const char **av, int shallow_flag, int not_shallow_flag);
 274 extern void set_alternate_shallow_file(const char *path, int override);
 275 extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
 276                                  const struct oid_array *extra);
 277 extern void setup_alternate_shallow(struct lock_file *shallow_lock,
 278                                     const char **alternate_shallow_file,
 279                                     const struct oid_array *extra);
 280 extern const char *setup_temporary_shallow(const struct oid_array *extra);
 281 extern void advertise_shallow_grafts(int);
 282
 283 struct shallow_info {
 284         struct oid_array *shallow;
 285         int *ours, nr_ours;
 286         int *theirs, nr_theirs;
 287         struct oid_array *ref;
 288
 289         /* for receive-pack */
 290         uint32_t **used_shallow;
 291         int *need_reachability_test;
 292         int *reachable;
 293         int *shallow_ref;
 294         struct commit **commits;
 295         int nr_commits;
 296 };
 297
 298 extern void prepare_shallow_info(struct shallow_info *, struct oid_array *);
 299 extern void clear_shallow_info(struct shallow_info *);
 300 extern void remove_nonexistent_theirs_shallow(struct shallow_info *);
 301 extern void assign_shallow_commits_to_refs(struct shallow_info *info,
 302                                            uint32_t **used,
 303                                            int *ref_status);
 304 extern int delayed_reachability_test(struct shallow_info *si, int c);
 305 extern void prune_shallow(int show_only);
 306 extern struct trace_key trace_shallow;
 307
 308 int is_descendant_of(struct commit *, struct commit_list *);
 309 int in_merge_bases(struct commit *, struct commit *);
 310 int in_merge_bases_many(struct commit *, int, struct commit **);
 311
 312 extern int interactive_add(int argc, const char **argv, const char *prefix, int patch);
 313 extern int run_add_interactive(const char *revision, const char *patch_mode,
 314                                const struct pathspec *pathspec);
 315
 316 /*
 317  * Takes a list of commits and returns a new list where those
 318  * have been removed that can be reached from other commits in
 319  * the list. It is useful for, e.g., reducing the commits
 320  * randomly thrown at the git-merge command and removing
 321  * redundant commits that the user shouldn't have given to it.
 322  *
 323  * This function destroys the STALE bit of the commit objects'
 324  * flags.
 325  */
 326 extern struct commit_list *reduce_heads(struct commit_list *heads);
 327
 328 /*
 329  * Like `reduce_heads()`, except it replaces the list. Use this
 330  * instead of `foo = reduce_heads(foo);` to avoid memory leaks.
 331  */
 332 extern void reduce_heads_replace(struct commit_list **heads);
 333
 334 struct commit_extra_header {
 335         struct commit_extra_header *next;
 336         char *key;
 337         char *value;
 338         size_t len;
 339 };
 340
 341 extern void append_merge_tag_headers(struct commit_list *parents,
 342                                      struct commit_extra_header ***tail);
 343
 344 extern int commit_tree(const char *msg, size_t msg_len,
 345                        const unsigned char *tree,
 346                        struct commit_list *parents, unsigned char *ret,
 347                        const char *author, const char *sign_commit);
 348
 349 extern int commit_tree_extended(const char *msg, size_t msg_len,
 350                                 const unsigned char *tree,
 351                                 struct commit_list *parents, unsigned char *ret,
 352                                 const char *author, const char *sign_commit,
 353                                 struct commit_extra_header *);
 354
 355 extern struct commit_extra_header *read_commit_extra_headers(struct commit *, const char **);
 356
 357 extern void free_commit_extra_headers(struct commit_extra_header *extra);
 358
 359 /*
 360  * Search the commit object contents given by "msg" for the header "key".
 361  * Returns a pointer to the start of the header contents, or NULL. The length
 362  * of the header, up to the first newline, is returned via out_len.
 363  *
 364  * Note that some headers (like mergetag) may be multi-line. It is the caller's
 365  * responsibility to parse further in this case!
 366  */
 367 extern const char *find_commit_header(const char *msg, const char *key,
 368                                       size_t *out_len);
 369
 370 /* Find the end of the log message, the right place for a new trailer. */
 371 extern int ignore_non_trailer(const char *buf, size_t len);
 372
 373 typedef void (*each_mergetag_fn)(struct commit *commit, struct commit_extra_header *extra,
 374                                  void *cb_data);
 375
 376 extern void for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data);
 377
 378 struct merge_remote_desc {
 379         struct object *obj; /* the named object, could be a tag */
 380         char name[FLEX_ARRAY];
 381 };
 382 #define merge_remote_util(commit) ((struct merge_remote_desc *)((commit)->util))
 383 extern void set_merge_remote_desc(struct commit *commit,
 384                                   const char *name, struct object *obj);
 385
 386 /*
 387  * Given "name" from the command line to merge, find the commit object
 388  * and return it, while storing merge_remote_desc in its ->util field,
 389  * to allow callers to tell if we are told to merge a tag.
 390  */
 391 struct commit *get_merge_parent(const char *name);
 392
 393 extern int parse_signed_commit(const struct commit *commit,
 394                                struct strbuf *message, struct strbuf *signature);
 395 extern int remove_signature(struct strbuf *buf);
 396
 397 /*
 398  * Check the signature of the given commit. The result of the check is stored
 399  * in sig->check_result, 'G' for a good signature, 'U' for a good signature
 400  * from an untrusted signer, 'B' for a bad signature and 'N' for no signature
 401  * at all.  This may allocate memory for sig->gpg_output, sig->gpg_status,
 402  * sig->signer and sig->key.
 403  */
 404 extern int check_commit_signature(const struct commit *commit, struct signature_check *sigc);
 405
 406 int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused);
 407
 408 LAST_ARG_MUST_BE_NULL
 409 extern int run_commit_hook(int editor_is_used, const char *index_file, const char *name, ...);
 410
 411 #endif /* COMMIT_H */