builtin-notes.c

   1 /*
   2  * Builtin "git notes"
   3  *
   4  * Copyright (c) 2010 Johan Herland <johan@herland.net>
   5  *
   6  * Based on git-notes.sh by Johannes Schindelin,
   7  * and builtin-tag.c by Kristian Høgsberg and Carlos Rica.
   8  */
   9
  10 #include "cache.h"
  11 #include "builtin.h"
  12 #include "notes.h"
  13 #include "blob.h"
  14 #include "commit.h"
  15 #include "refs.h"
  16 #include "exec_cmd.h"
  17 #include "run-command.h"
  18 #include "parse-options.h"
  19
  20 static const char * const git_notes_usage[] = {
  21         "git notes [list [<object>]]",
  22         "git notes add [-f] [-m <msg> | -F <file>] [<object>]",
  23         "git notes append [-m <msg> | -F <file>] [<object>]",
  24         "git notes edit [-m <msg> | -F <file>] [<object>]",
  25         "git notes show [<object>]",
  26         "git notes remove [<object>]",
  27         "git notes prune",
  28         NULL
  29 };
  30
  31 static const char note_template[] =
  32         "\n"
  33         "#\n"
  34         "# Write/edit the notes for the following object:\n"
  35         "#\n";
  36
  37 static int list_each_note(const unsigned char *object_sha1,
  38                 const unsigned char *note_sha1, char *note_path,
  39                 void *cb_data)
  40 {
  41         printf("%s %s\n", sha1_to_hex(note_sha1), sha1_to_hex(object_sha1));
  42         return 0;
  43 }
  44
  45 static void write_note_data(int fd, const unsigned char *sha1)
  46 {
  47         unsigned long size;
  48         enum object_type type;
  49         char *buf = read_sha1_file(sha1, &type, &size);
  50         if (buf) {
  51                 if (size)
  52                         write_or_die(fd, buf, size);
  53                 free(buf);
  54         }
  55 }
  56
  57 static void write_commented_object(int fd, const unsigned char *object)
  58 {
  59         const char *show_args[5] =
  60                 {"show", "--stat", "--no-notes", sha1_to_hex(object), NULL};
  61         struct child_process show;
  62         struct strbuf buf = STRBUF_INIT;
  63         FILE *show_out;
  64
  65         /* Invoke "git show --stat --no-notes $object" */
  66         memset(&show, 0, sizeof(show));
  67         show.argv = show_args;
  68         show.no_stdin = 1;
  69         show.out = -1;
  70         show.err = 0;
  71         show.git_cmd = 1;
  72         if (start_command(&show))
  73                 die("unable to start 'show' for object '%s'",
  74                     sha1_to_hex(object));
  75
  76         /* Open the output as FILE* so strbuf_getline() can be used. */
  77         show_out = xfdopen(show.out, "r");
  78         if (show_out == NULL)
  79                 die_errno("can't fdopen 'show' output fd");
  80
  81         /* Prepend "# " to each output line and write result to 'fd' */
  82         while (strbuf_getline(&buf, show_out, '\n') != EOF) {
  83                 write_or_die(fd, "# ", 2);
  84                 write_or_die(fd, buf.buf, buf.len);
  85                 write_or_die(fd, "\n", 1);
  86         }
  87         strbuf_release(&buf);
  88         if (fclose(show_out))
  89                 die_errno("failed to close pipe to 'show' for object '%s'",
  90                           sha1_to_hex(object));
  91         if (finish_command(&show))
  92                 die("failed to finish 'show' for object '%s'",
  93                     sha1_to_hex(object));
  94 }
  95
  96 static void create_note(const unsigned char *object,
  97                         struct strbuf *buf,
  98                         int skip_editor, int append_only,
  99                         const unsigned char *prev,
 100                         unsigned char *result)
 101 {
 102         char *path = NULL;
 103
 104         if (!skip_editor) {
 105                 int fd;
 106
 107                 /* write the template message before editing: */
 108                 path = git_pathdup("NOTES_EDITMSG");
 109                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 110                 if (fd < 0)
 111                         die_errno("could not create file '%s'", path);
 112
 113                 if (prev && !append_only)
 114                         write_note_data(fd, prev);
 115                 write_or_die(fd, note_template, strlen(note_template));
 116
 117                 write_commented_object(fd, object);
 118
 119                 close(fd);
 120
 121                 if (launch_editor(path, buf, NULL)) {
 122                         die("Please supply the note contents using either -m" \
 123                             " or -F option");
 124                 }
 125         }
 126
 127         stripspace(buf, 1);
 128
 129         if (prev && append_only) {
 130                 /* Append buf to previous note contents */
 131                 unsigned long size;
 132                 enum object_type type;
 133                 char *prev_buf = read_sha1_file(prev, &type, &size);
 134
 135                 strbuf_grow(buf, size + 1);
 136                 if (buf->len && prev_buf && size)
 137                         strbuf_insert(buf, 0, "\n", 1);
 138                 if (prev_buf && size)
 139                         strbuf_insert(buf, 0, prev_buf, size);
 140                 free(prev_buf);
 141         }
 142
 143         if (!buf->len) {
 144                 fprintf(stderr, "Removing note for object %s\n",
 145                         sha1_to_hex(object));
 146                 hashclr(result);
 147         } else {
 148                 if (write_sha1_file(buf->buf, buf->len, blob_type, result)) {
 149                         error("unable to write note object");
 150                         if (path)
 151                                 error("The note contents has been left in %s",
 152                                       path);
 153                         exit(128);
 154                 }
 155         }
 156
 157         if (path) {
 158                 unlink_or_warn(path);
 159                 free(path);
 160         }
 161 }
 162
 163 struct msg_arg {
 164         int given;
 165         struct strbuf buf;
 166 };
 167
 168 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 169 {
 170         struct msg_arg *msg = opt->value;
 171
 172         if (!arg)
 173                 return -1;
 174         if (msg->buf.len)
 175                 strbuf_addstr(&(msg->buf), "\n\n");
 176         strbuf_addstr(&(msg->buf), arg);
 177         msg->given = 1;
 178         return 0;
 179 }
 180
 181 int commit_notes(struct notes_tree *t, const char *msg)
 182 {
 183         struct commit_list *parent;
 184         unsigned char tree_sha1[20], prev_commit[20], new_commit[20];
 185         struct strbuf buf = STRBUF_INIT;
 186
 187         if (!t)
 188                 t = &default_notes_tree;
 189         if (!t->initialized || !t->ref || !*t->ref)
 190                 die("Cannot commit uninitialized/unreferenced notes tree");
 191
 192         /* Prepare commit message and reflog message */
 193         strbuf_addstr(&buf, "notes: "); /* commit message starts at index 7 */
 194         strbuf_addstr(&buf, msg);
 195         if (buf.buf[buf.len - 1] != '\n')
 196                 strbuf_addch(&buf, '\n'); /* Make sure msg ends with newline */
 197
 198         /* Convert notes tree to tree object */
 199         if (write_notes_tree(t, tree_sha1))
 200                 die("Failed to write current notes tree to database");
 201
 202         /* Create new commit for the tree object */
 203         if (!read_ref(t->ref, prev_commit)) { /* retrieve parent commit */
 204                 parent = xmalloc(sizeof(*parent));
 205                 parent->item = lookup_commit(prev_commit);
 206                 parent->next = NULL;
 207         } else {
 208                 hashclr(prev_commit);
 209                 parent = NULL;
 210         }
 211         if (commit_tree(buf.buf + 7, tree_sha1, parent, new_commit, NULL))
 212                 die("Failed to commit notes tree to database");
 213
 214         /* Update notes ref with new commit */
 215         update_ref(buf.buf, t->ref, new_commit, prev_commit, 0, DIE_ON_ERR);
 216
 217         strbuf_release(&buf);
 218         return 0;
 219 }
 220
 221 int cmd_notes(int argc, const char **argv, const char *prefix)
 222 {
 223         struct strbuf buf = STRBUF_INIT;
 224         struct notes_tree *t;
 225         unsigned char object[20], new_note[20];
 226         const unsigned char *note;
 227         const char *object_ref;
 228         char logmsg[100];
 229
 230         int list = 0, add = 0, append = 0, edit = 0, show = 0, remove = 0,
 231             prune = 0, force = 0;
 232         int given_object;
 233         const char *msgfile = NULL;
 234         struct msg_arg msg = { 0, STRBUF_INIT };
 235         struct option options[] = {
 236                 OPT_GROUP("Notes edit options"),
 237                 OPT_CALLBACK('m', "message", &msg, "msg",
 238                              "note contents as a string", parse_msg_arg),
 239                 OPT_FILENAME('F', "file", &msgfile, "note contents in a file"),
 240                 OPT_BOOLEAN('f', "force", &force, "replace existing notes"),
 241                 OPT_END()
 242         };
 243
 244         git_config(git_default_config, NULL);
 245
 246         argc = parse_options(argc, argv, prefix, options, git_notes_usage, 0);
 247
 248         if (argc && !strcmp(argv[0], "list"))
 249                 list = 1;
 250         else if (argc && !strcmp(argv[0], "add"))
 251                 add = 1;
 252         else if (argc && !strcmp(argv[0], "append"))
 253                 append = 1;
 254         else if (argc && !strcmp(argv[0], "edit"))
 255                 edit = 1;
 256         else if (argc && !strcmp(argv[0], "show"))
 257                 show = 1;
 258         else if (argc && !strcmp(argv[0], "remove"))
 259                 remove = 1;
 260         else if (argc && !strcmp(argv[0], "prune"))
 261                 prune = 1;
 262         else if (!argc)
 263                 list = 1; /* Default to 'list' if no other subcommand given */
 264
 265         if (list + add + append + edit + show + remove + prune != 1)
 266                 usage_with_options(git_notes_usage, options);
 267
 268         if ((msg.given || msgfile) && !(add || append || edit)) {
 269                 error("cannot use -m/-F options with %s subcommand.", argv[0]);
 270                 usage_with_options(git_notes_usage, options);
 271         }
 272
 273         if (msg.given && msgfile) {
 274                 error("mixing -m and -F options is not allowed.");
 275                 usage_with_options(git_notes_usage, options);
 276         }
 277
 278         if (force && !add) {
 279                 error("cannot use -f option with %s subcommand.", argv[0]);
 280                 usage_with_options(git_notes_usage, options);
 281         }
 282
 283         given_object = argc == 2;
 284         object_ref = given_object ? argv[1] : "HEAD";
 285         if (argc > 2 || (prune && argc > 1)) {
 286                 error("too many parameters");
 287                 usage_with_options(git_notes_usage, options);
 288         }
 289
 290         if (get_sha1(object_ref, object))
 291                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 292
 293         init_notes(NULL, NULL, NULL, 0);
 294         t = &default_notes_tree;
 295
 296         if (prefixcmp(t->ref, "refs/notes/"))
 297                 die("Refusing to %s notes in %s (outside of refs/notes/)",
 298                     argv[0], t->ref);
 299
 300         note = get_note(t, object);
 301
 302         /* list command */
 303
 304         if (list) {
 305                 if (given_object) {
 306                         if (note) {
 307                                 puts(sha1_to_hex(note));
 308                                 return 0;
 309                         }
 310                 } else
 311                         return for_each_note(t, 0, list_each_note, NULL);
 312         }
 313
 314         /* show command */
 315
 316         if ((list || show) && !note) {
 317                 error("No note found for object %s.", sha1_to_hex(object));
 318                 return 1;
 319         } else if (show) {
 320                 const char *show_args[3] = {"show", sha1_to_hex(note), NULL};
 321                 return execv_git_cmd(show_args);
 322         }
 323
 324         /* add/append/edit/remove/prune command */
 325
 326         if (add && note) {
 327                 if (force)
 328                         fprintf(stderr, "Overwriting existing notes for object %s\n",
 329                                 sha1_to_hex(object));
 330                 else {
 331                         error("Cannot add notes. Found existing notes for object %s. "
 332                               "Use '-f' to overwrite existing notes",
 333                               sha1_to_hex(object));
 334                         return 1;
 335                 }
 336         }
 337
 338         if (remove)
 339                 strbuf_reset(&buf);
 340         else if (msg.given)
 341                 strbuf_addbuf(&buf, &(msg.buf));
 342         else if (msgfile) {
 343                 if (!strcmp(msgfile, "-")) {
 344                         if (strbuf_read(&buf, 0, 1024) < 0)
 345                                 die_errno("cannot read '%s'", msgfile);
 346                 } else if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 347                         die_errno("could not open or read '%s'", msgfile);
 348         }
 349
 350         if (prune) {
 351                 hashclr(new_note);
 352                 prune_notes(t);
 353         } else {
 354                 create_note(object, &buf, msg.given || msgfile || remove,
 355                             append, note, new_note);
 356                 if (is_null_sha1(new_note))
 357                         remove_note(t, object);
 358                 else
 359                         add_note(t, object, new_note, combine_notes_overwrite);
 360         }
 361         snprintf(logmsg, sizeof(logmsg), "Note %s by 'git notes %s'",
 362                  is_null_sha1(new_note) ? "removed" : "added", argv[0]);
 363         commit_notes(t, logmsg);
 364
 365         free_notes(t);
 366         strbuf_release(&buf);
 367         return 0;
 368 }