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 edit [-m <msg> | -F <file>] [<object>]",
  22         "git notes show [<object>]",
  23         NULL
  24 };
  25
  26 static const char note_template[] =
  27         "\n"
  28         "#\n"
  29         "# Write/edit the notes for the following object:\n"
  30         "#\n";
  31
  32 static void write_note_data(int fd, const unsigned char *sha1)
  33 {
  34         unsigned long size;
  35         enum object_type type;
  36         char *buf = read_sha1_file(sha1, &type, &size);
  37         if (buf) {
  38                 if (size)
  39                         write_or_die(fd, buf, size);
  40                 free(buf);
  41         }
  42 }
  43
  44 static void write_commented_object(int fd, const unsigned char *object)
  45 {
  46         const char *show_args[5] =
  47                 {"show", "--stat", "--no-notes", sha1_to_hex(object), NULL};
  48         struct child_process show;
  49         struct strbuf buf = STRBUF_INIT;
  50         FILE *show_out;
  51
  52         /* Invoke "git show --stat --no-notes $object" */
  53         memset(&show, 0, sizeof(show));
  54         show.argv = show_args;
  55         show.no_stdin = 1;
  56         show.out = -1;
  57         show.err = 0;
  58         show.git_cmd = 1;
  59         if (start_command(&show))
  60                 die("unable to start 'show' for object '%s'",
  61                     sha1_to_hex(object));
  62
  63         /* Open the output as FILE* so strbuf_getline() can be used. */
  64         show_out = xfdopen(show.out, "r");
  65         if (show_out == NULL)
  66                 die_errno("can't fdopen 'show' output fd");
  67
  68         /* Prepend "# " to each output line and write result to 'fd' */
  69         while (strbuf_getline(&buf, show_out, '\n') != EOF) {
  70                 write_or_die(fd, "# ", 2);
  71                 write_or_die(fd, buf.buf, buf.len);
  72                 write_or_die(fd, "\n", 1);
  73         }
  74         strbuf_release(&buf);
  75         if (fclose(show_out))
  76                 die_errno("failed to close pipe to 'show' for object '%s'",
  77                           sha1_to_hex(object));
  78         if (finish_command(&show))
  79                 die("failed to finish 'show' for object '%s'",
  80                     sha1_to_hex(object));
  81 }
  82
  83 static void create_note(const unsigned char *object,
  84                         struct strbuf *buf,
  85                         int skip_editor,
  86                         const unsigned char *prev,
  87                         unsigned char *result)
  88 {
  89         char *path = NULL;
  90
  91         if (!skip_editor) {
  92                 int fd;
  93
  94                 /* write the template message before editing: */
  95                 path = git_pathdup("NOTES_EDITMSG");
  96                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
  97                 if (fd < 0)
  98                         die_errno("could not create file '%s'", path);
  99
 100                 if (prev)
 101                         write_note_data(fd, prev);
 102                 write_or_die(fd, note_template, strlen(note_template));
 103
 104                 write_commented_object(fd, object);
 105
 106                 close(fd);
 107
 108                 if (launch_editor(path, buf, NULL)) {
 109                         die("Please supply the note contents using either -m" \
 110                             " or -F option");
 111                 }
 112         }
 113
 114         stripspace(buf, 1);
 115
 116         if (!buf->len) {
 117                 fprintf(stderr, "Removing note for object %s\n",
 118                         sha1_to_hex(object));
 119                 hashclr(result);
 120         } else {
 121                 if (write_sha1_file(buf->buf, buf->len, blob_type, result)) {
 122                         error("unable to write note object");
 123                         if (path)
 124                                 error("The note contents has been left in %s",
 125                                       path);
 126                         exit(128);
 127                 }
 128         }
 129
 130         if (path) {
 131                 unlink_or_warn(path);
 132                 free(path);
 133         }
 134 }
 135
 136 struct msg_arg {
 137         int given;
 138         struct strbuf buf;
 139 };
 140
 141 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 142 {
 143         struct msg_arg *msg = opt->value;
 144
 145         if (!arg)
 146                 return -1;
 147         if (msg->buf.len)
 148                 strbuf_addstr(&(msg->buf), "\n\n");
 149         strbuf_addstr(&(msg->buf), arg);
 150         msg->given = 1;
 151         return 0;
 152 }
 153
 154 int commit_notes(struct notes_tree *t, const char *msg)
 155 {
 156         struct commit_list *parent;
 157         unsigned char tree_sha1[20], prev_commit[20], new_commit[20];
 158         struct strbuf buf = STRBUF_INIT;
 159
 160         if (!t)
 161                 t = &default_notes_tree;
 162         if (!t->initialized || !t->ref || !*t->ref)
 163                 die("Cannot commit uninitialized/unreferenced notes tree");
 164
 165         /* Prepare commit message and reflog message */
 166         strbuf_addstr(&buf, "notes: "); /* commit message starts at index 7 */
 167         strbuf_addstr(&buf, msg);
 168         if (buf.buf[buf.len - 1] != '\n')
 169                 strbuf_addch(&buf, '\n'); /* Make sure msg ends with newline */
 170
 171         /* Convert notes tree to tree object */
 172         if (write_notes_tree(t, tree_sha1))
 173                 die("Failed to write current notes tree to database");
 174
 175         /* Create new commit for the tree object */
 176         if (!read_ref(t->ref, prev_commit)) { /* retrieve parent commit */
 177                 parent = xmalloc(sizeof(*parent));
 178                 parent->item = lookup_commit(prev_commit);
 179                 parent->next = NULL;
 180         } else {
 181                 hashclr(prev_commit);
 182                 parent = NULL;
 183         }
 184         if (commit_tree(buf.buf + 7, tree_sha1, parent, new_commit, NULL))
 185                 die("Failed to commit notes tree to database");
 186
 187         /* Update notes ref with new commit */
 188         update_ref(buf.buf, t->ref, new_commit, prev_commit, 0, DIE_ON_ERR);
 189
 190         strbuf_release(&buf);
 191         return 0;
 192 }
 193
 194 int cmd_notes(int argc, const char **argv, const char *prefix)
 195 {
 196         struct strbuf buf = STRBUF_INIT;
 197         struct notes_tree *t;
 198         unsigned char object[20], new_note[20];
 199         const unsigned char *note;
 200         const char *object_ref, *logmsg;
 201
 202         int edit = 0, show = 0;
 203         const char *msgfile = NULL;
 204         struct msg_arg msg = { 0, STRBUF_INIT };
 205         struct option options[] = {
 206                 OPT_GROUP("Notes edit options"),
 207                 OPT_CALLBACK('m', NULL, &msg, "msg",
 208                              "note contents as a string", parse_msg_arg),
 209                 OPT_FILENAME('F', NULL, &msgfile, "note contents in a file"),
 210                 OPT_END()
 211         };
 212
 213         git_config(git_default_config, NULL);
 214
 215         argc = parse_options(argc, argv, prefix, options, git_notes_usage, 0);
 216
 217         if (argc && !strcmp(argv[0], "edit"))
 218                 edit = 1;
 219         else if (argc && !strcmp(argv[0], "show"))
 220                 show = 1;
 221
 222         if (edit + show != 1)
 223                 usage_with_options(git_notes_usage, options);
 224
 225         object_ref = argc == 2 ? argv[1] : "HEAD";
 226         if (argc > 2) {
 227                 error("too many parameters");
 228                 usage_with_options(git_notes_usage, options);
 229         }
 230
 231         if (get_sha1(object_ref, object))
 232                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 233
 234         init_notes(NULL, NULL, NULL, 0);
 235         t = &default_notes_tree;
 236
 237         if (prefixcmp(t->ref, "refs/notes/"))
 238                 die("Refusing to %s notes in %s (outside of refs/notes/)",
 239                     edit ? "edit" : "show", t->ref);
 240
 241         note = get_note(t, object);
 242
 243         /* show command */
 244
 245         if (show && !note) {
 246                 error("No note found for object %s.", sha1_to_hex(object));
 247                 return 1;
 248         } else if (show) {
 249                 const char *show_args[3] = {"show", sha1_to_hex(note), NULL};
 250                 return execv_git_cmd(show_args);
 251         }
 252
 253         /* edit command */
 254
 255         if (msg.given || msgfile) {
 256                 if (msg.given && msgfile) {
 257                         error("mixing -m and -F options is not allowed.");
 258                         usage_with_options(git_notes_usage, options);
 259                 }
 260                 if (msg.given)
 261                         strbuf_addbuf(&buf, &(msg.buf));
 262                 else {
 263                         if (!strcmp(msgfile, "-")) {
 264                                 if (strbuf_read(&buf, 0, 1024) < 0)
 265                                         die_errno("cannot read '%s'", msgfile);
 266                         } else {
 267                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 268                                         die_errno("could not open or read '%s'",
 269                                                 msgfile);
 270                         }
 271                 }
 272         }
 273
 274         create_note(object, &buf, msg.given || msgfile, note, new_note);
 275         if (is_null_sha1(new_note)) {
 276                 remove_note(t, object);
 277                 logmsg = "Note removed by 'git notes edit'";
 278         } else {
 279                 add_note(t, object, new_note, combine_notes_overwrite);
 280                 logmsg = "Note added by 'git notes edit'";
 281         }
 282         commit_notes(t, logmsg);
 283
 284         free_notes(t);
 285         strbuf_release(&buf);
 286         return 0;
 287 }