difftool: implement the functionality in the builtin
This patch gives life to the skeleton added in the previous patch. The motivation for converting the difftool is that Perl scripts are not at all native on Windows, and that `git difftool` therefore is pretty slow on that platform, when there is no good reason for it to be slow. In addition, Perl does not really have access to Git's internals. That means that any script will always have to jump through unnecessary hoops, and it will often need to perform unnecessary work (e.g. when reading the entire config every time `git config` is called to query a single config value). The current version of the builtin difftool does not, however, make full use of the internals but instead chooses to spawn a couple of Git processes, still, to make for an easier conversion. There remains a lot of room for improvement, left later. Note: to play it safe, the original difftool is still called unless the config setting difftool.useBuiltin is set to true. The reason: this new, experimental, builtin difftool was shipped as part of Git for Windows v2.11.0, to allow for easier large-scale testing, but of course as an opt-in feature. The speedup is actually more noticable on Linux than on Windows: a quick test shows that t7800-difftool.sh runs in (2.183s/0.052s/0.108s) (real/user/sys) in a Linux VM, down from (6.529s/3.112s/0.644s), while on Windows, it is (36.064s/2.730s/7.194s), down from (47.637s/2.407s/6.863s). The culprit is most likely the overhead incurred from *still* having to shell out to mergetool-lib.sh and difftool--helper.sh. Still, it is an improvement. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Johannes Schindelin committed
Jan 19, 2017 at 21:30 UTC
03831ef7b5011cbedbcc67abe5f47762f37c6c21
1 file changed
+671
-1
builtin/difftool.c
+671
-1
@@ -11,9 +11,610 @@
11
*
12
* Copyright (C) 2016 Johannes Schindelin
13
*/
14
+#include "cache.h"
15
#include "builtin.h"
16
#include "run-command.h"
17
#include "exec_cmd.h"
18
+#include "parse-options.h"
19
+#include "argv-array.h"
20
+#include "strbuf.h"
21
+#include "lockfile.h"
22
+#include "dir.h"
23
+
24
+static char *diff_gui_tool;
25
+static int trust_exit_code;
26
+
27
+static const char *const builtin_difftool_usage[] = {
28
+ N_("git difftool [<options>] [<commit> [<commit>]] [--] [<path>...]"),
29
+ NULL
30
+};
31
+
32
+static int difftool_config(const char *var, const char *value, void *cb)
33
+{
34
+ if (!strcmp(var, "diff.guitool")) {
35
+ diff_gui_tool = xstrdup(value);
36
+ return 0;
37
+ }
38
+
39
+ if (!strcmp(var, "difftool.trustexitcode")) {
40
+ trust_exit_code = git_config_bool(var, value);
41
+ return 0;
42
+ }
43
+
44
+ return git_default_config(var, value, cb);
45
+}
46
+
47
+static int print_tool_help(void)
48
+{
49
+ const char *argv[] = { "mergetool", "--tool-help=diff", NULL };
50
+ return run_command_v_opt(argv, RUN_GIT_CMD);
51
+}
52
+
53
+static int parse_index_info(char *p, int *mode1, int *mode2,
54
+ struct object_id *oid1, struct object_id *oid2,
55
+ char *status)
56
+{
57
+ if (*p != ':')
58
+ return error("expected ':', got '%c'", *p);
59
+ *mode1 = (int)strtol(p + 1, &p, 8);
60
+ if (*p != ' ')
61
+ return error("expected ' ', got '%c'", *p);
62
+ *mode2 = (int)strtol(p + 1, &p, 8);
63
+ if (*p != ' ')
64
+ return error("expected ' ', got '%c'", *p);
65
+ if (get_oid_hex(++p, oid1))
66
+ return error("expected object ID, got '%s'", p + 1);
67
+ p += GIT_SHA1_HEXSZ;
68
+ if (*p != ' ')
69
+ return error("expected ' ', got '%c'", *p);
70
+ if (get_oid_hex(++p, oid2))
71
+ return error("expected object ID, got '%s'", p + 1);
72
+ p += GIT_SHA1_HEXSZ;
73
+ if (*p != ' ')
74
+ return error("expected ' ', got '%c'", *p);
75
+ *status = *++p;
76
+ if (!*status)
77
+ return error("missing status");
78
+ if (p[1] && !isdigit(p[1]))
79
+ return error("unexpected trailer: '%s'", p + 1);
80
+ return 0;
81
+}
82
+
83
+/*
84
+ * Remove any trailing slash from $workdir
85
+ * before starting to avoid double slashes in symlink targets.
86
+ */
87
+static void add_path(struct strbuf *buf, size_t base_len, const char *path)
88
+{
89
+ strbuf_setlen(buf, base_len);
90
+ if (buf->len && buf->buf[buf->len - 1] != '/')
91
+ strbuf_addch(buf, '/');
92
+ strbuf_addstr(buf, path);
93
+}
94
+
95
+/*
96
+ * Determine whether we can simply reuse the file in the worktree.
97
+ */
98
+static int use_wt_file(const char *workdir, const char *name,
99
+ struct object_id *oid)
100
+{
101
+ struct strbuf buf = STRBUF_INIT;
102
+ struct stat st;
103
+ int use = 0;
104
+
105
+ strbuf_addstr(&buf, workdir);
106
+ add_path(&buf, buf.len, name);
107
+
108
+ if (!lstat(buf.buf, &st) && !S_ISLNK(st.st_mode)) {
109
+ struct object_id wt_oid;
110
+ int fd = open(buf.buf, O_RDONLY);
111
+
112
+ if (fd >= 0 &&
113
+ !index_fd(wt_oid.hash, fd, &st, OBJ_BLOB, name, 0)) {
114
+ if (is_null_oid(oid)) {
115
+ oidcpy(oid, &wt_oid);
116
+ use = 1;
117
+ } else if (!oidcmp(oid, &wt_oid))
118
+ use = 1;
119
+ }
120
+ }
121
+
122
+ strbuf_release(&buf);
123
+
124
+ return use;
125
+}
126
+
127
+struct working_tree_entry {
128
+ struct hashmap_entry entry;
129
+ char path[FLEX_ARRAY];
130
+};
131
+
132
+static int working_tree_entry_cmp(struct working_tree_entry *a,
133
+ struct working_tree_entry *b, void *keydata)
134
+{
135
+ return strcmp(a->path, b->path);
136
+}
137
+
138
+/*
139
+ * The `left` and `right` entries hold paths for the symlinks hashmap,
140
+ * and a SHA-1 surrounded by brief text for submodules.
141
+ */
142
+struct pair_entry {
143
+ struct hashmap_entry entry;
144
+ char left[PATH_MAX], right[PATH_MAX];
145
+ const char path[FLEX_ARRAY];
146
+};
147
+
148
+static int pair_cmp(struct pair_entry *a, struct pair_entry *b, void *keydata)
149
+{
150
+ return strcmp(a->path, b->path);
151
+}
152
+
153
+static void add_left_or_right(struct hashmap *map, const char *path,
154
+ const char *content, int is_right)
155
+{
156
+ struct pair_entry *e, *existing;
157
+
158
+ FLEX_ALLOC_STR(e, path, path);
159
+ hashmap_entry_init(e, strhash(path));
160
+ existing = hashmap_get(map, e, NULL);
161
+ if (existing) {
162
+ free(e);
163
+ e = existing;
164
+ } else {
165
+ e->left[0] = e->right[0] = '\0';
166
+ hashmap_add(map, e);
167
+ }
168
+ strlcpy(is_right ? e->right : e->left, content, PATH_MAX);
169
+}
170
+
171
+struct path_entry {
172
+ struct hashmap_entry entry;
173
+ char path[FLEX_ARRAY];
174
+};
175
+
176
+static int path_entry_cmp(struct path_entry *a, struct path_entry *b, void *key)
177
+{
178
+ return strcmp(a->path, key ? key : b->path);
179
+}
180
+
181
+static void changed_files(struct hashmap *result, const char *index_path,
182
+ const char *workdir)
183
+{
184
+ struct child_process update_index = CHILD_PROCESS_INIT;
185
+ struct child_process diff_files = CHILD_PROCESS_INIT;
186
+ struct strbuf index_env = STRBUF_INIT, buf = STRBUF_INIT;
187
+ const char *git_dir = absolute_path(get_git_dir()), *env[] = {
188
+ NULL, NULL
189
+ };
190
+ FILE *fp;
191
+
192
+ strbuf_addf(&index_env, "GIT_INDEX_FILE=%s", index_path);
193
+ env[0] = index_env.buf;
194
+
195
+ argv_array_pushl(&update_index.args,
196
+ "--git-dir", git_dir, "--work-tree", workdir,
197
+ "update-index", "--really-refresh", "-q",
198
+ "--unmerged", NULL);
199
+ update_index.no_stdin = 1;
200
+ update_index.no_stdout = 1;
201
+ update_index.no_stderr = 1;
202
+ update_index.git_cmd = 1;
203
+ update_index.use_shell = 0;
204
+ update_index.clean_on_exit = 1;
205
+ update_index.dir = workdir;
206
+ update_index.env = env;
207
+ /* Ignore any errors of update-index */
208
+ run_command(&update_index);
209
+
210
+ argv_array_pushl(&diff_files.args,
211
+ "--git-dir", git_dir, "--work-tree", workdir,
212
+ "diff-files", "--name-only", "-z", NULL);
213
+ diff_files.no_stdin = 1;
214
+ diff_files.git_cmd = 1;
215
+ diff_files.use_shell = 0;
216
+ diff_files.clean_on_exit = 1;
217
+ diff_files.out = -1;
218
+ diff_files.dir = workdir;
219
+ diff_files.env = env;
220
+ if (start_command(&diff_files))
221
+ die("could not obtain raw diff");
222
+ fp = xfdopen(diff_files.out, "r");
223
+ while (!strbuf_getline_nul(&buf, fp)) {
224
+ struct path_entry *entry;
225
+ FLEX_ALLOC_STR(entry, path, buf.buf);
226
+ hashmap_entry_init(entry, strhash(buf.buf));
227
+ hashmap_add(result, entry);
228
+ }
229
+ if (finish_command(&diff_files))
230
+ die("diff-files did not exit properly");
231
+ strbuf_release(&index_env);
232
+ strbuf_release(&buf);
233
+}
234
+
235
+static NORETURN void exit_cleanup(const char *tmpdir, int exit_code)
236
+{
237
+ struct strbuf buf = STRBUF_INIT;
238
+ strbuf_addstr(&buf, tmpdir);
239
+ remove_dir_recursively(&buf, 0);
240
+ if (exit_code)
241
+ warning(_("failed: %d"), exit_code);
242
+ exit(exit_code);
243
+}
244
+
245
+static int ensure_leading_directories(char *path)
246
+{
247
+ switch (safe_create_leading_directories(path)) {
248
+ case SCLD_OK:
249
+ case SCLD_EXISTS:
250
+ return 0;
251
+ default:
252
+ return error(_("could not create leading directories "
253
+ "of '%s'"), path);
254
+ }
255
+}
256
+
257
+static int run_dir_diff(const char *extcmd, int symlinks, const char *prefix,
258
+ int argc, const char **argv)
259
+{
260
+ char tmpdir[PATH_MAX];
261
+ struct strbuf info = STRBUF_INIT, lpath = STRBUF_INIT;
262
+ struct strbuf rpath = STRBUF_INIT, buf = STRBUF_INIT;
263
+ struct strbuf ldir = STRBUF_INIT, rdir = STRBUF_INIT;
264
+ struct strbuf wtdir = STRBUF_INIT;
265
+ size_t ldir_len, rdir_len, wtdir_len;
266
+ struct cache_entry *ce = xcalloc(1, sizeof(ce) + PATH_MAX + 1);
267
+ const char *workdir, *tmp;
268
+ int ret = 0, i;
269
+ FILE *fp;
270
+ struct hashmap working_tree_dups, submodules, symlinks2;
271
+ struct hashmap_iter iter;
272
+ struct pair_entry *entry;
273
+ enum object_type type;
274
+ unsigned long size;
275
+ struct index_state wtindex;
276
+ struct checkout lstate, rstate;
277
+ int rc, flags = RUN_GIT_CMD, err = 0;
278
+ struct child_process child = CHILD_PROCESS_INIT;
279
+ const char *helper_argv[] = { "difftool--helper", NULL, NULL, NULL };
280
+ struct hashmap wt_modified, tmp_modified;
281
+ int indices_loaded = 0;
282
+
283
+ workdir = get_git_work_tree();
284
+
285
+ /* Setup temp directories */
286
+ tmp = getenv("TMPDIR");
287
+ xsnprintf(tmpdir, sizeof(tmpdir), "%s/git-difftool.XXXXXX", tmp ? tmp : "/tmp");
288
+ if (!mkdtemp(tmpdir))
289
+ return error("could not create '%s'", tmpdir);
290
+ strbuf_addf(&ldir, "%s/left/", tmpdir);
291
+ strbuf_addf(&rdir, "%s/right/", tmpdir);
292
+ strbuf_addstr(&wtdir, workdir);
293
+ if (!wtdir.len || !is_dir_sep(wtdir.buf[wtdir.len - 1]))
294
+ strbuf_addch(&wtdir, '/');
295
+ mkdir(ldir.buf, 0700);
296
+ mkdir(rdir.buf, 0700);
297
+
298
+ memset(&wtindex, 0, sizeof(wtindex));
299
+
300
+ memset(&lstate, 0, sizeof(lstate));
301
+ lstate.base_dir = ldir.buf;
302
+ lstate.base_dir_len = ldir.len;
303
+ lstate.force = 1;
304
+ memset(&rstate, 0, sizeof(rstate));
305
+ rstate.base_dir = rdir.buf;
306
+ rstate.base_dir_len = rdir.len;
307
+ rstate.force = 1;
308
+
309
+ ldir_len = ldir.len;
310
+ rdir_len = rdir.len;
311
+ wtdir_len = wtdir.len;
312
+
313
+ hashmap_init(&working_tree_dups,
314
+ (hashmap_cmp_fn)working_tree_entry_cmp, 0);
315
+ hashmap_init(&submodules, (hashmap_cmp_fn)pair_cmp, 0);
316
+ hashmap_init(&symlinks2, (hashmap_cmp_fn)pair_cmp, 0);
317
+
318
+ child.no_stdin = 1;
319
+ child.git_cmd = 1;
320
+ child.use_shell = 0;
321
+ child.clean_on_exit = 1;
322
+ child.dir = prefix;
323
+ child.out = -1;
324
+ argv_array_pushl(&child.args, "diff", "--raw", "--no-abbrev", "-z",
325
+ NULL);
326
+ for (i = 0; i < argc; i++)
327
+ argv_array_push(&child.args, argv[i]);
328
+ if (start_command(&child))
329
+ die("could not obtain raw diff");
330
+ fp = xfdopen(child.out, "r");
331
+
332
+ /* Build index info for left and right sides of the diff */
333
+ i = 0;
334
+ while (!strbuf_getline_nul(&info, fp)) {
335
+ int lmode, rmode;
336
+ struct object_id loid, roid;
337
+ char status;
338
+ const char *src_path, *dst_path;
339
+ size_t src_path_len, dst_path_len;
340
+
341
+ if (starts_with(info.buf, "::"))
342
+ die(N_("combined diff formats('-c' and '--cc') are "
343
+ "not supported in\n"
344
+ "directory diff mode('-d' and '--dir-diff')."));
345
+
346
+ if (parse_index_info(info.buf, &lmode, &rmode, &loid, &roid,
347
+ &status))
348
+ break;
349
+ if (strbuf_getline_nul(&lpath, fp))
350
+ break;
351
+ src_path = lpath.buf;
352
+ src_path_len = lpath.len;
353
+
354
+ i++;
355
+ if (status != 'C' && status != 'R') {
356
+ dst_path = src_path;
357
+ dst_path_len = src_path_len;
358
+ } else {
359
+ if (strbuf_getline_nul(&rpath, fp))
360
+ break;
361
+ dst_path = rpath.buf;
362
+ dst_path_len = rpath.len;
363
+ }
364
+
365
+ if (S_ISGITLINK(lmode) || S_ISGITLINK(rmode)) {
366
+ strbuf_reset(&buf);
367
+ strbuf_addf(&buf, "Subproject commit %s",
368
+ oid_to_hex(&loid));
369
+ add_left_or_right(&submodules, src_path, buf.buf, 0);
370
+ strbuf_reset(&buf);
371
+ strbuf_addf(&buf, "Subproject commit %s",
372
+ oid_to_hex(&roid));
373
+ if (!oidcmp(&loid, &roid))
374
+ strbuf_addstr(&buf, "-dirty");
375
+ add_left_or_right(&submodules, dst_path, buf.buf, 1);
376
+ continue;
377
+ }
378
+
379
+ if (S_ISLNK(lmode)) {
380
+ char *content = read_sha1_file(loid.hash, &type, &size);
381
+ add_left_or_right(&symlinks2, src_path, content, 0);
382
+ free(content);
383
+ }
384
+
385
+ if (S_ISLNK(rmode)) {
386
+ char *content = read_sha1_file(roid.hash, &type, &size);
387
+ add_left_or_right(&symlinks2, dst_path, content, 1);
388
+ free(content);
389
+ }
390
+
391
+ if (lmode && status != 'C') {
392
+ ce->ce_mode = lmode;
393
+ oidcpy(&ce->oid, &loid);
394
+ strcpy(ce->name, src_path);
395
+ ce->ce_namelen = src_path_len;
396
+ if (checkout_entry(ce, &lstate, NULL))
397
+ return error("could not write '%s'", src_path);
398
+ }
399
+
400
+ if (rmode) {
401
+ struct working_tree_entry *entry;
402
+
403
+ /* Avoid duplicate working_tree entries */
404
+ FLEX_ALLOC_STR(entry, path, dst_path);
405
+ hashmap_entry_init(entry, strhash(dst_path));
406
+ if (hashmap_get(&working_tree_dups, entry, NULL)) {
407
+ free(entry);
408
+ continue;
409
+ }
410
+ hashmap_add(&working_tree_dups, entry);
411
+
412
+ if (!use_wt_file(workdir, dst_path, &roid)) {
413
+ ce->ce_mode = rmode;
414
+ oidcpy(&ce->oid, &roid);
415
+ strcpy(ce->name, dst_path);
416
+ ce->ce_namelen = dst_path_len;
417
+ if (checkout_entry(ce, &rstate, NULL))
418
+ return error("could not write '%s'",
419
+ dst_path);
420
+ } else if (!is_null_oid(&roid)) {
421
+ /*
422
+ * Changes in the working tree need special
423
+ * treatment since they are not part of the
424
+ * index.
425
+ */
426
+ struct cache_entry *ce2 =
427
+ make_cache_entry(rmode, roid.hash,
428
+ dst_path, 0, 0);
429
+
430
+ add_index_entry(&wtindex, ce2,
431
+ ADD_CACHE_JUST_APPEND);
432
+
433
+ add_path(&rdir, rdir_len, dst_path);
434
+ if (ensure_leading_directories(rdir.buf))
435
+ return error("could not create "
436
+ "directory for '%s'",
437
+ dst_path);
438
+ add_path(&wtdir, wtdir_len, dst_path);
439
+ if (symlinks) {
440
+ if (symlink(wtdir.buf, rdir.buf)) {
441
+ ret = error_errno("could not symlink '%s' to '%s'", wtdir.buf, rdir.buf);
442
+ goto finish;
443
+ }
444
+ } else {
445
+ struct stat st;
446
+ if (stat(wtdir.buf, &st))
447
+ st.st_mode = 0644;
448
+ if (copy_file(rdir.buf, wtdir.buf,
449
+ st.st_mode)) {
450
+ ret = error("could not copy '%s' to '%s'", wtdir.buf, rdir.buf);
451
+ goto finish;
452
+ }
453
+ }
454
+ }
455
+ }
456
+ }
457
+
458
+ if (finish_command(&child)) {
459
+ ret = error("error occurred running diff --raw");
460
+ goto finish;
461
+ }
462
+
463
+ if (!i)
464
+ return 0;
465
+
466
+ /*
467
+ * Changes to submodules require special treatment.This loop writes a
468
+ * temporary file to both the left and right directories to show the
469
+ * change in the recorded SHA1 for the submodule.
470
+ */
471
+ hashmap_iter_init(&submodules, &iter);
472
+ while ((entry = hashmap_iter_next(&iter))) {
473
+ if (*entry->left) {
474
+ add_path(&ldir, ldir_len, entry->path);
475
+ ensure_leading_directories(ldir.buf);
476
+ write_file(ldir.buf, "%s", entry->left);
477
+ }
478
+ if (*entry->right) {
479
+ add_path(&rdir, rdir_len, entry->path);
480
+ ensure_leading_directories(rdir.buf);
481
+ write_file(rdir.buf, "%s", entry->right);
482
+ }
483
+ }
484
+
485
+ /*
486
+ * Symbolic links require special treatment.The standard "git diff"
487
+ * shows only the link itself, not the contents of the link target.
488
+ * This loop replicates that behavior.
489
+ */
490
+ hashmap_iter_init(&symlinks2, &iter);
491
+ while ((entry = hashmap_iter_next(&iter))) {
492
+ if (*entry->left) {
493
+ add_path(&ldir, ldir_len, entry->path);
494
+ ensure_leading_directories(ldir.buf);
495
+ write_file(ldir.buf, "%s", entry->left);
496
+ }
497
+ if (*entry->right) {
498
+ add_path(&rdir, rdir_len, entry->path);
499
+ ensure_leading_directories(rdir.buf);
500
+ write_file(rdir.buf, "%s", entry->right);
501
+ }
502
+ }
503
+
504
+ strbuf_release(&buf);
505
+
506
+ strbuf_setlen(&ldir, ldir_len);
507
+ helper_argv[1] = ldir.buf;
508
+ strbuf_setlen(&rdir, rdir_len);
509
+ helper_argv[2] = rdir.buf;
510
+
511
+ if (extcmd) {
512
+ helper_argv[0] = extcmd;
513
+ flags = 0;
514
+ } else
515
+ setenv("GIT_DIFFTOOL_DIRDIFF", "true", 1);
516
+ rc = run_command_v_opt(helper_argv, flags);
517
+
518
+ /*
519
+ * If the diff includes working copy files and those
520
+ * files were modified during the diff, then the changes
521
+ * should be copied back to the working tree.
522
+ * Do not copy back files when symlinks are used and the
523
+ * external tool did not replace the original link with a file.
524
+ *
525
+ * These hashes are loaded lazily since they aren't needed
526
+ * in the common case of --symlinks and the difftool updating
527
+ * files through the symlink.
528
+ */
529
+ hashmap_init(&wt_modified, (hashmap_cmp_fn)path_entry_cmp,
530
+ wtindex.cache_nr);
531
+ hashmap_init(&tmp_modified, (hashmap_cmp_fn)path_entry_cmp,
532
+ wtindex.cache_nr);
533
+
534
+ for (i = 0; i < wtindex.cache_nr; i++) {
535
+ struct hashmap_entry dummy;
536
+ const char *name = wtindex.cache[i]->name;
537
+ struct stat st;
538
+
539
+ add_path(&rdir, rdir_len, name);
540
+ if (lstat(rdir.buf, &st))
541
+ continue;
542
+
543
+ if ((symlinks && S_ISLNK(st.st_mode)) || !S_ISREG(st.st_mode))
544
+ continue;
545
+
546
+ if (!indices_loaded) {
547
+ static struct lock_file lock;
548
+ strbuf_reset(&buf);
549
+ strbuf_addf(&buf, "%s/wtindex", tmpdir);
550
+ if (hold_lock_file_for_update(&lock, buf.buf, 0) < 0 ||
551
+ write_locked_index(&wtindex, &lock, COMMIT_LOCK)) {
552
+ ret = error("could not write %s", buf.buf);
553
+ rollback_lock_file(&lock);
554
+ goto finish;
555
+ }
556
+ changed_files(&wt_modified, buf.buf, workdir);
557
+ strbuf_setlen(&rdir, rdir_len);
558
+ changed_files(&tmp_modified, buf.buf, rdir.buf);
559
+ add_path(&rdir, rdir_len, name);
560
+ indices_loaded = 1;
561
+ }
562
+
563
+ hashmap_entry_init(&dummy, strhash(name));
564
+ if (hashmap_get(&tmp_modified, &dummy, name)) {
565
+ add_path(&wtdir, wtdir_len, name);
566
+ if (hashmap_get(&wt_modified, &dummy, name)) {
567
+ warning(_("both files modified: '%s' and '%s'."),
568
+ wtdir.buf, rdir.buf);
569
+ warning(_("working tree file has been left."));
570
+ warning("");
571
+ err = 1;
572
+ } else if (unlink(wtdir.buf) ||
573
+ copy_file(wtdir.buf, rdir.buf, st.st_mode))
574
+ warning_errno(_("could not copy '%s' to '%s'"),
575
+ rdir.buf, wtdir.buf);
576
+ }
577
+ }
578
+
579
+ if (err) {
580
+ warning(_("temporary files exist in '%s'."), tmpdir);
581
+ warning(_("you may want to cleanup or recover these."));
582
+ exit(1);
583
+ } else
584
+ exit_cleanup(tmpdir, rc);
585
+
586
+finish:
587
+ free(ce);
588
+ strbuf_release(&ldir);
589
+ strbuf_release(&rdir);
590
+ strbuf_release(&wtdir);
591
+ strbuf_release(&buf);
592
+
593
+ return ret;
594
+}
595
+
596
+static int run_file_diff(int prompt, const char *prefix,
597
+ int argc, const char **argv)
598
+{
599
+ struct argv_array args = ARGV_ARRAY_INIT;
600
+ const char *env[] = {
601
+ "GIT_PAGER=", "GIT_EXTERNAL_DIFF=git-difftool--helper", NULL,
602
+ NULL
603
+ };
604
+ int ret = 0, i;
605
+
606
+ if (prompt > 0)
607
+ env[2] = "GIT_DIFFTOOL_PROMPT=true";
608
+ else if (!prompt)
609
+ env[2] = "GIT_DIFFTOOL_NO_PROMPT=true";
610
+
611
+
612
+ argv_array_push(&args, "diff");
613
+ for (i = 0; i < argc; i++)
614
+ argv_array_push(&args, argv[i]);
615
+ ret = run_command_v_opt_cd_env(args.argv, RUN_GIT_CMD, prefix, env);
616
+ exit(ret);
617
+}
618
619
/*
620
* NEEDSWORK: this function can go once the legacy-difftool Perl script is
@@ -41,6 +642,35 @@ static int use_builtin_difftool(void) {
642
643
int cmd_difftool(int argc, const char **argv, const char *prefix)
644
{
645
+ int use_gui_tool = 0, dir_diff = 0, prompt = -1, symlinks = 0,
646
+ tool_help = 0;
647
+ static char *difftool_cmd = NULL, *extcmd = NULL;
648
+ struct option builtin_difftool_options[] = {
649
+ OPT_BOOL('g', "gui", &use_gui_tool,
650
+ N_("use `diff.guitool` instead of `diff.tool`")),
651
+ OPT_BOOL('d', "dir-diff", &dir_diff,
652
+ N_("perform a full-directory diff")),
653
+ { OPTION_SET_INT, 'y', "no-prompt", &prompt, NULL,
654
+ N_("do not prompt before launching a diff tool"),
655
+ PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 0},
656
+ { OPTION_SET_INT, 0, "prompt", &prompt, NULL, NULL,
657
+ PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN,
658
+ NULL, 1 },
659
+ OPT_BOOL(0, "symlinks", &symlinks,
660
+ N_("use symlinks in dir-diff mode")),
661
+ OPT_STRING('t', "tool", &difftool_cmd, N_("<tool>"),
662
+ N_("use the specified diff tool")),
663
+ OPT_BOOL(0, "tool-help", &tool_help,
664
+ N_("print a list of diff tools that may be used with "
665
+ "`--tool`")),
666
+ OPT_BOOL(0, "trust-exit-code", &trust_exit_code,
667
+ N_("make 'git-difftool' exit when an invoked diff "
668
+ "tool returns a non - zero exit code")),
669
+ OPT_STRING('x', "extcmd", &extcmd, N_("<command>"),
670
+ N_("specify a custom command for viewing diffs")),
671
+ OPT_END()
672
+ };
673
+
674
/*
675
* NEEDSWORK: Once the builtin difftool has been tested enough
676
* and git-legacy-difftool.perl is retired to contrib/, this preamble
@@ -58,6 +688,46 @@ int cmd_difftool(int argc, const char **argv, const char *prefix)
688
prefix = setup_git_directory();
689
trace_repo_setup(prefix);
690
setup_work_tree();
691
+ /* NEEDSWORK: once we no longer spawn anything, remove this */
692
+ setenv(GIT_DIR_ENVIRONMENT, absolute_path(get_git_dir()), 1);
693
+ setenv(GIT_WORK_TREE_ENVIRONMENT, absolute_path(get_git_work_tree()), 1);
694
+
695
+ git_config(difftool_config, NULL);
696
+ symlinks = has_symlinks;
697
+
698
+ argc = parse_options(argc, argv, prefix, builtin_difftool_options,
699
+ builtin_difftool_usage, PARSE_OPT_KEEP_UNKNOWN |
700
+ PARSE_OPT_KEEP_DASHDASH);
701
62
- die("TODO");
702
+ if (tool_help)
703
+ return print_tool_help();
704
+
705
+ if (use_gui_tool && diff_gui_tool && *diff_gui_tool)
706
+ setenv("GIT_DIFF_TOOL", diff_gui_tool, 1);
707
+ else if (difftool_cmd) {
708
+ if (*difftool_cmd)
709
+ setenv("GIT_DIFF_TOOL", difftool_cmd, 1);
710
+ else
711
+ die(_("no <tool> given for --tool=<tool>"));
712
+ }
713
+
714
+ if (extcmd) {
715
+ if (*extcmd)
716
+ setenv("GIT_DIFFTOOL_EXTCMD", extcmd, 1);
717
+ else
718
+ die(_("no <cmd> given for --extcmd=<cmd>"));
719
+ }
720
+
721
+ setenv("GIT_DIFFTOOL_TRUST_EXIT_CODE",
722
+ trust_exit_code ? "true" : "false", 1);
723
+
724
+ /*
725
+ * In directory diff mode, 'git-difftool--helper' is called once
726
+ * to compare the a / b directories. In file diff mode, 'git diff'
727
+ * will invoke a separate instance of 'git-difftool--helper' for
728
+ * each file that changed.
729
+ */
730
+ if (dir_diff)
731
+ return run_dir_diff(extcmd, symlinks, prefix, argc, argv);
732
+ return run_file_diff(prompt, prefix, argc, argv);
733
}