submodules: ensure clean environment when operating in a submodule
[git] / 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> | (-c | -C) <object>] [<object>]",
23         "git notes copy [-f] <from-object> <to-object>",
24         "git notes append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
25         "git notes edit [<object>]",
26         "git notes show [<object>]",
27         "git notes remove [<object>]",
28         "git notes prune",
29         NULL
30 };
31
32 static const char note_template[] =
33         "\n"
34         "#\n"
35         "# Write/edit the notes for the following object:\n"
36         "#\n";
37
38 struct msg_arg {
39         int given;
40         int use_editor;
41         struct strbuf buf;
42 };
43
44 static int list_each_note(const unsigned char *object_sha1,
45                 const unsigned char *note_sha1, char *note_path,
46                 void *cb_data)
47 {
48         printf("%s %s\n", sha1_to_hex(note_sha1), sha1_to_hex(object_sha1));
49         return 0;
50 }
51
52 static void write_note_data(int fd, const unsigned char *sha1)
53 {
54         unsigned long size;
55         enum object_type type;
56         char *buf = read_sha1_file(sha1, &type, &size);
57         if (buf) {
58                 if (size)
59                         write_or_die(fd, buf, size);
60                 free(buf);
61         }
62 }
63
64 static void write_commented_object(int fd, const unsigned char *object)
65 {
66         const char *show_args[5] =
67                 {"show", "--stat", "--no-notes", sha1_to_hex(object), NULL};
68         struct child_process show;
69         struct strbuf buf = STRBUF_INIT;
70         FILE *show_out;
71
72         /* Invoke "git show --stat --no-notes $object" */
73         memset(&show, 0, sizeof(show));
74         show.argv = show_args;
75         show.no_stdin = 1;
76         show.out = -1;
77         show.err = 0;
78         show.git_cmd = 1;
79         if (start_command(&show))
80                 die("unable to start 'show' for object '%s'",
81                     sha1_to_hex(object));
82
83         /* Open the output as FILE* so strbuf_getline() can be used. */
84         show_out = xfdopen(show.out, "r");
85         if (show_out == NULL)
86                 die_errno("can't fdopen 'show' output fd");
87
88         /* Prepend "# " to each output line and write result to 'fd' */
89         while (strbuf_getline(&buf, show_out, '\n') != EOF) {
90                 write_or_die(fd, "# ", 2);
91                 write_or_die(fd, buf.buf, buf.len);
92                 write_or_die(fd, "\n", 1);
93         }
94         strbuf_release(&buf);
95         if (fclose(show_out))
96                 die_errno("failed to close pipe to 'show' for object '%s'",
97                           sha1_to_hex(object));
98         if (finish_command(&show))
99                 die("failed to finish 'show' for object '%s'",
100                     sha1_to_hex(object));
101 }
102
103 static void create_note(const unsigned char *object, struct msg_arg *msg,
104                         int append_only, const unsigned char *prev,
105                         unsigned char *result)
106 {
107         char *path = NULL;
108
109         if (msg->use_editor || !msg->given) {
110                 int fd;
111
112                 /* write the template message before editing: */
113                 path = git_pathdup("NOTES_EDITMSG");
114                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
115                 if (fd < 0)
116                         die_errno("could not create file '%s'", path);
117
118                 if (msg->given)
119                         write_or_die(fd, msg->buf.buf, msg->buf.len);
120                 else if (prev && !append_only)
121                         write_note_data(fd, prev);
122                 write_or_die(fd, note_template, strlen(note_template));
123
124                 write_commented_object(fd, object);
125
126                 close(fd);
127                 strbuf_reset(&(msg->buf));
128
129                 if (launch_editor(path, &(msg->buf), NULL)) {
130                         die("Please supply the note contents using either -m" \
131                             " or -F option");
132                 }
133                 stripspace(&(msg->buf), 1);
134         }
135
136         if (prev && append_only) {
137                 /* Append buf to previous note contents */
138                 unsigned long size;
139                 enum object_type type;
140                 char *prev_buf = read_sha1_file(prev, &type, &size);
141
142                 strbuf_grow(&(msg->buf), size + 1);
143                 if (msg->buf.len && prev_buf && size)
144                         strbuf_insert(&(msg->buf), 0, "\n", 1);
145                 if (prev_buf && size)
146                         strbuf_insert(&(msg->buf), 0, prev_buf, size);
147                 free(prev_buf);
148         }
149
150         if (!msg->buf.len) {
151                 fprintf(stderr, "Removing note for object %s\n",
152                         sha1_to_hex(object));
153                 hashclr(result);
154         } else {
155                 if (write_sha1_file(msg->buf.buf, msg->buf.len, blob_type, result)) {
156                         error("unable to write note object");
157                         if (path)
158                                 error("The note contents has been left in %s",
159                                       path);
160                         exit(128);
161                 }
162         }
163
164         if (path) {
165                 unlink_or_warn(path);
166                 free(path);
167         }
168 }
169
170 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
171 {
172         struct msg_arg *msg = opt->value;
173
174         if (!arg)
175                 return -1;
176
177         strbuf_grow(&(msg->buf), strlen(arg) + 2);
178         if (msg->buf.len)
179                 strbuf_addstr(&(msg->buf), "\n");
180         strbuf_addstr(&(msg->buf), arg);
181         stripspace(&(msg->buf), 0);
182
183         msg->given = 1;
184         return 0;
185 }
186
187 static int parse_file_arg(const struct option *opt, const char *arg, int unset)
188 {
189         struct msg_arg *msg = opt->value;
190
191         if (!arg)
192                 return -1;
193
194         if (msg->buf.len)
195                 strbuf_addstr(&(msg->buf), "\n");
196         if (!strcmp(arg, "-")) {
197                 if (strbuf_read(&(msg->buf), 0, 1024) < 0)
198                         die_errno("cannot read '%s'", arg);
199         } else if (strbuf_read_file(&(msg->buf), arg, 1024) < 0)
200                 die_errno("could not open or read '%s'", arg);
201         stripspace(&(msg->buf), 0);
202
203         msg->given = 1;
204         return 0;
205 }
206
207 static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
208 {
209         struct msg_arg *msg = opt->value;
210         char *buf;
211         unsigned char object[20];
212         enum object_type type;
213         unsigned long len;
214
215         if (!arg)
216                 return -1;
217
218         if (msg->buf.len)
219                 strbuf_addstr(&(msg->buf), "\n");
220
221         if (get_sha1(arg, object))
222                 die("Failed to resolve '%s' as a valid ref.", arg);
223         if (!(buf = read_sha1_file(object, &type, &len)) || !len) {
224                 free(buf);
225                 die("Failed to read object '%s'.", arg);;
226         }
227         strbuf_add(&(msg->buf), buf, len);
228         free(buf);
229
230         msg->given = 1;
231         return 0;
232 }
233
234 static int parse_reedit_arg(const struct option *opt, const char *arg, int unset)
235 {
236         struct msg_arg *msg = opt->value;
237         msg->use_editor = 1;
238         return parse_reuse_arg(opt, arg, unset);
239 }
240
241 int commit_notes(struct notes_tree *t, const char *msg)
242 {
243         struct commit_list *parent;
244         unsigned char tree_sha1[20], prev_commit[20], new_commit[20];
245         struct strbuf buf = STRBUF_INIT;
246
247         if (!t)
248                 t = &default_notes_tree;
249         if (!t->initialized || !t->ref || !*t->ref)
250                 die("Cannot commit uninitialized/unreferenced notes tree");
251
252         /* Prepare commit message and reflog message */
253         strbuf_addstr(&buf, "notes: "); /* commit message starts at index 7 */
254         strbuf_addstr(&buf, msg);
255         if (buf.buf[buf.len - 1] != '\n')
256                 strbuf_addch(&buf, '\n'); /* Make sure msg ends with newline */
257
258         /* Convert notes tree to tree object */
259         if (write_notes_tree(t, tree_sha1))
260                 die("Failed to write current notes tree to database");
261
262         /* Create new commit for the tree object */
263         if (!read_ref(t->ref, prev_commit)) { /* retrieve parent commit */
264                 parent = xmalloc(sizeof(*parent));
265                 parent->item = lookup_commit(prev_commit);
266                 parent->next = NULL;
267         } else {
268                 hashclr(prev_commit);
269                 parent = NULL;
270         }
271         if (commit_tree(buf.buf + 7, tree_sha1, parent, new_commit, NULL))
272                 die("Failed to commit notes tree to database");
273
274         /* Update notes ref with new commit */
275         update_ref(buf.buf, t->ref, new_commit, prev_commit, 0, DIE_ON_ERR);
276
277         strbuf_release(&buf);
278         return 0;
279 }
280
281 int cmd_notes(int argc, const char **argv, const char *prefix)
282 {
283         struct notes_tree *t;
284         unsigned char object[20], from_obj[20], new_note[20];
285         const unsigned char *note;
286         const char *object_ref;
287         char logmsg[100];
288
289         int list = 0, add = 0, copy = 0, append = 0, edit = 0, show = 0,
290             remove = 0, prune = 0, force = 0;
291         int given_object = 0, i = 1, retval = 0;
292         struct msg_arg msg = { 0, 0, STRBUF_INIT };
293         struct option options[] = {
294                 OPT_GROUP("Notes options"),
295                 OPT_CALLBACK('m', "message", &msg, "MSG",
296                              "note contents as a string", parse_msg_arg),
297                 OPT_CALLBACK('F', "file", &msg, "FILE",
298                              "note contents in a file", parse_file_arg),
299                 OPT_CALLBACK('c', "reedit-message", &msg, "OBJECT",
300                            "reuse and edit specified note object", parse_reedit_arg),
301                 OPT_CALLBACK('C', "reuse-message", &msg, "OBJECT",
302                            "reuse specified note object", parse_reuse_arg),
303                 OPT_BOOLEAN('f', "force", &force, "replace existing notes"),
304                 OPT_END()
305         };
306
307         git_config(git_default_config, NULL);
308
309         argc = parse_options(argc, argv, prefix, options, git_notes_usage, 0);
310
311         if (argc && !strcmp(argv[0], "list"))
312                 list = 1;
313         else if (argc && !strcmp(argv[0], "add"))
314                 add = 1;
315         else if (argc && !strcmp(argv[0], "copy"))
316                 copy = 1;
317         else if (argc && !strcmp(argv[0], "append"))
318                 append = 1;
319         else if (argc && !strcmp(argv[0], "edit"))
320                 edit = 1;
321         else if (argc && !strcmp(argv[0], "show"))
322                 show = 1;
323         else if (argc && !strcmp(argv[0], "remove"))
324                 remove = 1;
325         else if (argc && !strcmp(argv[0], "prune"))
326                 prune = 1;
327         else if (!argc) {
328                 list = 1; /* Default to 'list' if no other subcommand given */
329                 i = 0;
330         }
331
332         if (list + add + copy + append + edit + show + remove + prune != 1)
333                 usage_with_options(git_notes_usage, options);
334
335         if (msg.given && !(add || append || edit)) {
336                 error("cannot use -m/-F/-c/-C options with %s subcommand.",
337                       argv[0]);
338                 usage_with_options(git_notes_usage, options);
339         }
340
341         if (msg.given && edit) {
342                 fprintf(stderr, "The -m/-F/-c/-C options have been deprecated "
343                         "for the 'edit' subcommand.\n"
344                         "Please use 'git notes add -f -m/-F/-c/-C' instead.\n");
345         }
346
347         if (force && !(add || copy)) {
348                 error("cannot use -f option with %s subcommand.", argv[0]);
349                 usage_with_options(git_notes_usage, options);
350         }
351
352         if (copy) {
353                 const char *from_ref;
354                 if (argc < 3) {
355                         error("too few parameters");
356                         usage_with_options(git_notes_usage, options);
357                 }
358                 from_ref = argv[i++];
359                 if (get_sha1(from_ref, from_obj))
360                         die("Failed to resolve '%s' as a valid ref.", from_ref);
361         }
362
363         given_object = argc > i;
364         object_ref = given_object ? argv[i++] : "HEAD";
365
366         if (argc > i || (prune && given_object)) {
367                 error("too many parameters");
368                 usage_with_options(git_notes_usage, options);
369         }
370
371         if (get_sha1(object_ref, object))
372                 die("Failed to resolve '%s' as a valid ref.", object_ref);
373
374         init_notes(NULL, NULL, NULL, 0);
375         t = &default_notes_tree;
376
377         if (prefixcmp(t->ref, "refs/notes/"))
378                 die("Refusing to %s notes in %s (outside of refs/notes/)",
379                     argv[0], t->ref);
380
381         note = get_note(t, object);
382
383         /* list command */
384
385         if (list) {
386                 if (given_object) {
387                         if (note) {
388                                 puts(sha1_to_hex(note));
389                                 goto end;
390                         }
391                 } else {
392                         retval = for_each_note(t, 0, list_each_note, NULL);
393                         goto end;
394                 }
395         }
396
397         /* show command */
398
399         if ((list || show) && !note) {
400                 error("No note found for object %s.", sha1_to_hex(object));
401                 retval = 1;
402                 goto end;
403         } else if (show) {
404                 const char *show_args[3] = {"show", sha1_to_hex(note), NULL};
405                 retval = execv_git_cmd(show_args);
406                 goto end;
407         }
408
409         /* add/append/edit/remove/prune command */
410
411         if ((add || copy) && note) {
412                 if (!force) {
413                         error("Cannot %s notes. Found existing notes for object"
414                               " %s. Use '-f' to overwrite existing notes",
415                               argv[0], sha1_to_hex(object));
416                         retval = 1;
417                         goto end;
418                 }
419                 fprintf(stderr, "Overwriting existing notes for object %s\n",
420                         sha1_to_hex(object));
421         }
422
423         if (remove) {
424                 msg.given = 1;
425                 msg.use_editor = 0;
426                 strbuf_reset(&(msg.buf));
427         }
428
429         if (prune) {
430                 hashclr(new_note);
431                 prune_notes(t);
432                 goto commit;
433         } else if (copy) {
434                 const unsigned char *from_note = get_note(t, from_obj);
435                 if (!from_note) {
436                         error("Missing notes on source object %s. Cannot copy.",
437                               sha1_to_hex(from_obj));
438                         retval = 1;
439                         goto end;
440                 }
441                 hashcpy(new_note, from_note);
442         } else
443                 create_note(object, &msg, append, note, new_note);
444
445         if (is_null_sha1(new_note))
446                 remove_note(t, object);
447         else
448                 add_note(t, object, new_note, combine_notes_overwrite);
449
450 commit:
451         snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
452                  is_null_sha1(new_note) ? "removed" : "added", argv[0]);
453         commit_notes(t, logmsg);
454
455 end:
456         free_notes(t);
457         strbuf_release(&(msg.buf));
458         return retval;
459 }