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 #include "pretty.h"
  11 #include "commit-slab.h"
  12
  13 #define COMMIT_NOT_FROM_GRAPH 0xFFFFFFFF
  14 #define GENERATION_NUMBER_INFINITY ((1ULL << 63) - 1)
  15 #define GENERATION_NUMBER_V1_MAX 0x3FFFFFFF
  16 #define GENERATION_NUMBER_ZERO 0
  17 #define GENERATION_NUMBER_V2_OFFSET_MAX ((1ULL << 31) - 1)
  18
  19 struct commit_list {
  20         struct commit *item;
  21         struct commit_list *next;
  22 };
  23
  24 /*
  25  * The size of this struct matters in full repo walk operations like
  26  * 'git clone' or 'git gc'. Consider using commit-slab to attach data
  27  * to a commit instead of adding new fields here.
  28  */
  29 struct commit {
  30         struct object object;
  31         timestamp_t date;
  32         struct commit_list *parents;
  33
  34         /*
  35          * If the commit is loaded from the commit-graph file, then this
  36          * member may be NULL. Only access it through repo_get_commit_tree()
  37          * or get_commit_tree_oid().
  38          */
  39         struct tree *maybe_tree;
  40         unsigned int index;
  41 };
  42
  43 extern int save_commit_buffer;
  44 extern const char *commit_type;
  45
  46 /* While we can decorate any object with a name, it's only used for commits.. */
  47 struct name_decoration {
  48         struct name_decoration *next;
  49         int type;
  50         char name[FLEX_ARRAY];
  51 };
  52
  53 enum 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
  63 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj);
  64 const struct name_decoration *get_name_decoration(const struct object *obj);
  65
  66 struct commit *lookup_commit(struct repository *r, const struct object_id *oid);
  67 struct commit *lookup_commit_reference(struct repository *r,
  68                                        const struct object_id *oid);
  69 struct commit *lookup_commit_reference_gently(struct repository *r,
  70                                               const struct object_id *oid,
  71                                               int quiet);
  72 struct commit *lookup_commit_reference_by_name(const char *name);
  73
  74 /*
  75  * Look up object named by "oid", dereference tag as necessary,
  76  * get a commit and return it. If "oid" does not dereference to
  77  * a commit, use ref_name to report an error and die.
  78  */
  79 struct commit *lookup_commit_or_die(const struct object_id *oid, const char *ref_name);
  80
  81 int parse_commit_buffer(struct repository *r, struct commit *item, const void *buffer, unsigned long size, int check_graph);
  82 int repo_parse_commit_internal(struct repository *r, struct commit *item,
  83                                int quiet_on_missing, int use_commit_graph);
  84 int repo_parse_commit_gently(struct repository *r,
  85                              struct commit *item,
  86                              int quiet_on_missing);
  87 static inline int repo_parse_commit(struct repository *r, struct commit *item)
  88 {
  89         return repo_parse_commit_gently(r, item, 0);
  90 }
  91
  92 static inline int repo_parse_commit_no_graph(struct repository *r,
  93                                              struct commit *commit)
  94 {
  95         return repo_parse_commit_internal(r, commit, 0, 0);
  96 }
  97
  98 #ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
  99 #define parse_commit_internal(item, quiet, use) repo_parse_commit_internal(the_repository, item, quiet, use)
 100 #define parse_commit(item) repo_parse_commit(the_repository, item)
 101 #endif
 102
 103 void parse_commit_or_die(struct commit *item);
 104
 105 struct buffer_slab;
 106 struct buffer_slab *allocate_commit_buffer_slab(void);
 107 void free_commit_buffer_slab(struct buffer_slab *bs);
 108
 109 /*
 110  * Associate an object buffer with the commit. The ownership of the
 111  * memory is handed over to the commit, and must be free()-able.
 112  */
 113 void set_commit_buffer(struct repository *r, struct commit *, void *buffer, unsigned long size);
 114
 115 /*
 116  * Get any cached object buffer associated with the commit. Returns NULL
 117  * if none. The resulting memory should not be freed.
 118  */
 119 const void *get_cached_commit_buffer(struct repository *, const struct commit *, unsigned long *size);
 120
 121 /*
 122  * Get the commit's object contents, either from cache or by reading the object
 123  * from disk. The resulting memory should not be modified, and must be given
 124  * to unuse_commit_buffer when the caller is done.
 125  */
 126 const void *repo_get_commit_buffer(struct repository *r,
 127                                    const struct commit *,
 128                                    unsigned long *size);
 129 #ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
 130 #define get_commit_buffer(c, s) repo_get_commit_buffer(the_repository, c, s)
 131 #endif
 132
 133 /*
 134  * Tell the commit subsystem that we are done with a particular commit buffer.
 135  * The commit and buffer should be the input and return value, respectively,
 136  * from an earlier call to get_commit_buffer.  The buffer may or may not be
 137  * freed by this call; callers should not access the memory afterwards.
 138  */
 139 void repo_unuse_commit_buffer(struct repository *r,
 140                               const struct commit *,
 141                               const void *buffer);
 142 #ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
 143 #define unuse_commit_buffer(c, b) repo_unuse_commit_buffer(the_repository, c, b)
 144 #endif
 145
 146 /*
 147  * Free any cached object buffer associated with the commit.
 148  */
 149 void free_commit_buffer(struct parsed_object_pool *pool, struct commit *);
 150
 151 struct tree *repo_get_commit_tree(struct repository *, const struct commit *);
 152 #define get_commit_tree(c) repo_get_commit_tree(the_repository, c)
 153 struct object_id *get_commit_tree_oid(const struct commit *);
 154
 155 /*
 156  * Release memory related to a commit, including the parent list and
 157  * any cached object buffer.
 158  */
 159 void release_commit_memory(struct parsed_object_pool *pool, struct commit *c);
 160
 161 /*
 162  * Disassociate any cached object buffer from the commit, but do not free it.
 163  * The buffer (or NULL, if none) is returned.
 164  */
 165 const void *detach_commit_buffer(struct commit *, unsigned long *sizep);
 166
 167 /* Find beginning and length of commit subject. */
 168 int find_commit_subject(const char *commit_buffer, const char **subject);
 169
 170 struct commit_list *commit_list_insert(struct commit *item,
 171                                         struct commit_list **list);
 172 int commit_list_contains(struct commit *item,
 173                          struct commit_list *list);
 174 struct commit_list **commit_list_append(struct commit *commit,
 175                                         struct commit_list **next);
 176 unsigned commit_list_count(const struct commit_list *l);
 177 struct commit_list *commit_list_insert_by_date(struct commit *item,
 178                                     struct commit_list **list);
 179 void commit_list_sort_by_date(struct commit_list **list);
 180
 181 /* Shallow copy of the input list */
 182 struct commit_list *copy_commit_list(struct commit_list *list);
 183
 184 /* Modify list in-place to reverse it, returning new head; list will be tail */
 185 struct commit_list *reverse_commit_list(struct commit_list *list);
 186
 187 void free_commit_list(struct commit_list *list);
 188
 189 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 190
 191 int has_non_ascii(const char *text);
 192 const char *logmsg_reencode(const struct commit *commit,
 193                             char **commit_encoding,
 194                             const char *output_encoding);
 195 const char *repo_logmsg_reencode(struct repository *r,
 196                                  const struct commit *commit,
 197                                  char **commit_encoding,
 198                                  const char *output_encoding);
 199 #ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
 200 #define logmsg_reencode(c, enc, out) repo_logmsg_reencode(the_repository, c, enc, out)
 201 #endif
 202
 203 const char *skip_blank_lines(const char *msg);
 204
 205 /** Removes the first commit from a list sorted by date, and adds all
 206  * of its parents.
 207  **/
 208 struct commit *pop_most_recent_commit(struct commit_list **list,
 209                                       unsigned int mark);
 210
 211 struct commit *pop_commit(struct commit_list **stack);
 212
 213 void clear_commit_marks(struct commit *commit, unsigned int mark);
 214 void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark);
 215
 216
 217 enum rev_sort_order {
 218         REV_SORT_IN_GRAPH_ORDER = 0,
 219         REV_SORT_BY_COMMIT_DATE,
 220         REV_SORT_BY_AUTHOR_DATE
 221 };
 222
 223 /*
 224  * Performs an in-place topological sort of list supplied.
 225  *
 226  *   invariant of resulting list is:
 227  *      a reachable from b => ord(b) < ord(a)
 228  *   sort_order further specifies:
 229  *   REV_SORT_IN_GRAPH_ORDER: try to show a commit on a single-parent
 230  *                            chain together.
 231  *   REV_SORT_BY_COMMIT_DATE: show eligible commits in committer-date order.
 232  */
 233 void sort_in_topological_order(struct commit_list **, enum rev_sort_order);
 234
 235 struct commit_graft {
 236         struct object_id oid;
 237         int nr_parent; /* < 0 if shallow commit */
 238         struct object_id parent[FLEX_ARRAY]; /* more */
 239 };
 240 typedef int (*each_commit_graft_fn)(const struct commit_graft *, void *);
 241
 242 struct commit_graft *read_graft_line(struct strbuf *line);
 243 /* commit_graft_pos returns an index into r->parsed_objects->grafts. */
 244 int commit_graft_pos(struct repository *r, const struct object_id *oid);
 245 int register_commit_graft(struct repository *r, struct commit_graft *, int);
 246 void prepare_commit_graft(struct repository *r);
 247 struct commit_graft *lookup_commit_graft(struct repository *r, const struct object_id *oid);
 248
 249 struct commit *get_fork_point(const char *refname, struct commit *commit);
 250
 251 /* largest positive number a signed 32-bit integer can contain */
 252 #define INFINITE_DEPTH 0x7fffffff
 253
 254 struct oid_array;
 255 struct ref;
 256 int for_each_commit_graft(each_commit_graft_fn, void *);
 257
 258 int interactive_add(const char **argv, const char *prefix, int patch);
 259 int run_add_interactive(const char *revision, const char *patch_mode,
 260                         const struct pathspec *pathspec);
 261
 262 struct commit_extra_header {
 263         struct commit_extra_header *next;
 264         char *key;
 265         char *value;
 266         size_t len;
 267 };
 268
 269 void append_merge_tag_headers(struct commit_list *parents,
 270                               struct commit_extra_header ***tail);
 271
 272 int commit_tree(const char *msg, size_t msg_len,
 273                 const struct object_id *tree,
 274                 struct commit_list *parents, struct object_id *ret,
 275                 const char *author, const char *sign_commit);
 276
 277 int commit_tree_extended(const char *msg, size_t msg_len,
 278                          const struct object_id *tree,
 279                          struct commit_list *parents, struct object_id *ret,
 280                          const char *author, const char *committer,
 281                          const char *sign_commit, struct commit_extra_header *);
 282
 283 struct commit_extra_header *read_commit_extra_headers(struct commit *, const char **);
 284
 285 void free_commit_extra_headers(struct commit_extra_header *extra);
 286
 287 /*
 288  * Search the commit object contents given by "msg" for the header "key".
 289  * Returns a pointer to the start of the header contents, or NULL. The length
 290  * of the header, up to the first newline, is returned via out_len.
 291  *
 292  * Note that some headers (like mergetag) may be multi-line. It is the caller's
 293  * responsibility to parse further in this case!
 294  */
 295 const char *find_commit_header(const char *msg, const char *key,
 296                                size_t *out_len);
 297
 298 /* Find the end of the log message, the right place for a new trailer. */
 299 size_t ignore_non_trailer(const char *buf, size_t len);
 300
 301 typedef int (*each_mergetag_fn)(struct commit *commit, struct commit_extra_header *extra,
 302                                 void *cb_data);
 303
 304 int for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data);
 305
 306 struct merge_remote_desc {
 307         struct object *obj; /* the named object, could be a tag */
 308         char name[FLEX_ARRAY];
 309 };
 310 struct merge_remote_desc *merge_remote_util(struct commit *);
 311 void set_merge_remote_desc(struct commit *commit,
 312                            const char *name, struct object *obj);
 313
 314 /*
 315  * Given "name" from the command line to merge, find the commit object
 316  * and return it, while storing merge_remote_desc in its ->util field,
 317  * to allow callers to tell if we are told to merge a tag.
 318  */
 319 struct commit *get_merge_parent(const char *name);
 320
 321 int parse_signed_commit(const struct commit *commit,
 322                         struct strbuf *message, struct strbuf *signature,
 323                         const struct git_hash_algo *algop);
 324 int remove_signature(struct strbuf *buf);
 325
 326 /*
 327  * Check the signature of the given commit. The result of the check is stored
 328  * in sig->check_result, 'G' for a good signature, 'U' for a good signature
 329  * from an untrusted signer, 'B' for a bad signature and 'N' for no signature
 330  * at all.  This may allocate memory for sig->gpg_output, sig->gpg_status,
 331  * sig->signer and sig->key.
 332  */
 333 int check_commit_signature(const struct commit *commit, struct signature_check *sigc);
 334
 335 /* record author-date for each commit object */
 336 struct author_date_slab;
 337 void record_author_date(struct author_date_slab *author_date,
 338                         struct commit *commit);
 339
 340 int compare_commits_by_author_date(const void *a_, const void *b_, void *unused);
 341
 342 /*
 343  * Verify a single commit with check_commit_signature() and die() if it is not
 344  * a good signature. This isn't really suitable for general use, but is a
 345  * helper to implement consistent logic for pull/merge --verify-signatures.
 346  *
 347  * The check_trust parameter is meant for backward-compatibility.  The GPG
 348  * interface verifies key trust with a default trust level that is below the
 349  * default trust level for merge operations.  Its value should be non-zero if
 350  * the user hasn't set a minimum trust level explicitly in their configuration.
 351  *
 352  * If the user has set a minimum trust level, then that value should be obeyed
 353  * and check_trust should be zero, even if the configured trust level is below
 354  * the default trust level for merges.
 355  */
 356 void verify_merge_signature(struct commit *commit, int verbose,
 357                             int check_trust);
 358
 359 int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused);
 360 int compare_commits_by_gen_then_commit_date(const void *a_, const void *b_, void *unused);
 361
 362 LAST_ARG_MUST_BE_NULL
 363 int run_commit_hook(int editor_is_used, const char *index_file, const char *name, ...);
 364
 365 /* Sign a commit or tag buffer, storing the result in a header. */
 366 int sign_with_header(struct strbuf *buf, const char *keyid);
 367 /* Parse the signature out of a header. */
 368 int parse_buffer_signed_by_header(const char *buffer,
 369                                   unsigned long size,
 370                                   struct strbuf *payload,
 371                                   struct strbuf *signature,
 372                                   const struct git_hash_algo *algop);
 373
 374 #endif /* COMMIT_H */