1 /*
2  * Copyright (c) 2017 Martin Pieuchot <mpi@openbsd.org>
3  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/queue.h>
19 #include <sys/limits.h>
20 
21 #include <err.h>
22 #include <errno.h>
23 #include <locale.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <unistd.h>
28 #include <libgen.h>
29 
30 #include "got_error.h"
31 #include "got_object.h"
32 #include "got_reference.h"
33 #include "got_repository.h"
34 #include "got_worktree.h"
35 #include "got_diff.h"
36 #include "got_commit_graph.h"
37 
38 #ifndef nitems
39 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
40 #endif
41 
42 struct cmd {
43 	const char	 *cmd_name;
44 	const struct got_error *(*cmd_main)(int, char *[]);
45 	void		(*cmd_usage)(void);
46 	const char	 *cmd_descr;
47 };
48 
49 __dead static void	usage(void);
50 __dead static void	usage_checkout(void);
51 __dead static void	usage_log(void);
52 __dead static void	usage_diff(void);
53 
54 static const struct got_error*		cmd_checkout(int, char *[]);
55 static const struct got_error*		cmd_log(int, char *[]);
56 static const struct got_error*		cmd_diff(int, char *[]);
57 #ifdef notyet
58 static const struct got_error*		cmd_status(int, char *[]);
59 #endif
60 
61 static struct cmd got_commands[] = {
62 	{ "checkout",	cmd_checkout,	usage_checkout,
63 	    "check out a new work tree from a repository" },
64 	{ "log",	cmd_log,	usage_log,
65 	    "show repository history" },
66 	{ "diff",	cmd_diff,	usage_diff,
67 	    "compare files and directories" },
68 #ifdef notyet
69 	{ "status",	cmd_status,	usage_status,
70 	    "show modification status of files" },
71 #endif
72 };
73 
74 int
75 main(int argc, char *argv[])
76 {
77 	struct cmd *cmd;
78 	unsigned int i;
79 	int ch;
80 	int hflag = 0;
81 
82 	setlocale(LC_ALL, "");
83 
84 	while ((ch = getopt(argc, argv, "h")) != -1) {
85 		switch (ch) {
86 		case 'h':
87 			hflag = 1;
88 			break;
89 		default:
90 			usage();
91 			/* NOTREACHED */
92 		}
93 	}
94 
95 	argc -= optind;
96 	argv += optind;
97 	optind = 0;
98 
99 	if (argc <= 0)
100 		usage();
101 
102 	for (i = 0; i < nitems(got_commands); i++) {
103 		const struct got_error *error;
104 
105 		cmd = &got_commands[i];
106 
107 		if (strncmp(cmd->cmd_name, argv[0], strlen(argv[0])))
108 			continue;
109 
110 		if (hflag)
111 			got_commands[i].cmd_usage();
112 
113 		error = got_commands[i].cmd_main(argc, argv);
114 		if (error) {
115 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
116 			return 1;
117 		}
118 
119 		return 0;
120 	}
121 
122 	fprintf(stderr, "%s: unknown command '%s'\n", getprogname(), argv[0]);
123 	return 1;
124 }
125 
126 __dead static void
127 usage(void)
128 {
129 	int i;
130 
131 	fprintf(stderr, "usage: %s [-h] command [arg ...]\n\n"
132 	    "Available commands:\n", getprogname());
133 	for (i = 0; i < nitems(got_commands); i++) {
134 		struct cmd *cmd = &got_commands[i];
135 		fprintf(stderr, "    %s: %s\n", cmd->cmd_name, cmd->cmd_descr);
136 	}
137 	exit(1);
138 }
139 
140 __dead static void
141 usage_checkout(void)
142 {
143 	fprintf(stderr, "usage: %s checkout [-p prefix] repository-path "
144 	    "[worktree-path]\n", getprogname());
145 	exit(1);
146 }
147 
148 static void
149 checkout_progress(void *arg, const char *path)
150 {
151 	char *worktree_path = arg;
152 
153 	while (path[0] == '/')
154 		path++;
155 
156 	printf("A  %s/%s\n", worktree_path, path);
157 }
158 
159 static const struct got_error *
160 cmd_checkout(int argc, char *argv[])
161 {
162 	const struct got_error *error = NULL;
163 	struct got_repository *repo = NULL;
164 	struct got_reference *head_ref = NULL;
165 	struct got_worktree *worktree = NULL;
166 	char *repo_path = NULL;
167 	char *worktree_path = NULL;
168 	const char *path_prefix = "";
169 	int ch;
170 
171 	while ((ch = getopt(argc, argv, "p:")) != -1) {
172 		switch (ch) {
173 		case 'p':
174 			path_prefix = optarg;
175 			break;
176 		default:
177 			usage();
178 			/* NOTREACHED */
179 		}
180 	}
181 
182 	argc -= optind;
183 	argv += optind;
184 
185 #ifndef PROFILE
186 	if (pledge("stdio rpath wpath cpath flock proc", NULL) == -1)
187 		err(1, "pledge");
188 #endif
189 	if (argc == 1) {
190 		char *cwd, *base, *dotgit;
191 		repo_path = realpath(argv[0], NULL);
192 		if (repo_path == NULL)
193 			return got_error_from_errno();
194 		cwd = getcwd(NULL, 0);
195 		if (cwd == NULL) {
196 			error = got_error_from_errno();
197 			goto done;
198 		}
199 		if (path_prefix[0])
200 			base = basename(path_prefix);
201 		else
202 			base = basename(repo_path);
203 		if (base == NULL) {
204 			error = got_error_from_errno();
205 			goto done;
206 		}
207 		dotgit = strstr(base, ".git");
208 		if (dotgit)
209 			*dotgit = '\0';
210 		if (asprintf(&worktree_path, "%s/%s", cwd, base) == -1) {
211 			error = got_error_from_errno();
212 			free(cwd);
213 			goto done;
214 		}
215 		free(cwd);
216 	} else if (argc == 2) {
217 		repo_path = realpath(argv[0], NULL);
218 		if (repo_path == NULL) {
219 			error = got_error_from_errno();
220 			goto done;
221 		}
222 		worktree_path = realpath(argv[1], NULL);
223 		if (worktree_path == NULL) {
224 			error = got_error_from_errno();
225 			goto done;
226 		}
227 	} else
228 		usage_checkout();
229 
230 	error = got_repo_open(&repo, repo_path);
231 	if (error != NULL)
232 		goto done;
233 	error = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
234 	if (error != NULL)
235 		goto done;
236 
237 	error = got_worktree_init(worktree_path, head_ref, path_prefix, repo);
238 	if (error != NULL)
239 		goto done;
240 
241 	error = got_worktree_open(&worktree, worktree_path);
242 	if (error != NULL)
243 		goto done;
244 
245 	error = got_worktree_checkout_files(worktree, head_ref, repo,
246 	    checkout_progress, worktree_path);
247 	if (error != NULL)
248 		goto done;
249 
250 	printf("Checked out %s\n", worktree_path);
251 	printf("Now shut up and hack\n");
252 
253 done:
254 	free(repo_path);
255 	free(worktree_path);
256 	return error;
257 }
258 
259 static const struct got_error *
260 print_patch(struct got_commit_object *commit, struct got_object_id *id,
261     struct got_repository *repo)
262 {
263 	const struct got_error *err = NULL;
264 	struct got_tree_object *tree1 = NULL, *tree2;
265 	struct got_object *obj;
266 	struct got_parent_id *pid;
267 
268 	err = got_object_open(&obj, repo, commit->tree_id);
269 	if (err)
270 		return err;
271 
272 	err = got_object_tree_open(&tree2, repo, obj);
273 	got_object_close(obj);
274 	if (err)
275 		return err;
276 
277 	pid = SIMPLEQ_FIRST(&commit->parent_ids);
278 	if (pid != NULL) {
279 		struct got_commit_object *pcommit;
280 
281 		err = got_object_open(&obj, repo, pid->id);
282 		if (err)
283 			return err;
284 
285 		err = got_object_commit_open(&pcommit, repo, obj);
286 		got_object_close(obj);
287 		if (err)
288 			return err;
289 
290 		err = got_object_open(&obj, repo, pcommit->tree_id);
291 		got_object_commit_close(pcommit);
292 		if (err)
293 			return err;
294 		err = got_object_tree_open(&tree1, repo, obj);
295 		got_object_close(obj);
296 		if (err)
297 			return err;
298 	}
299 
300 	err = got_diff_tree(tree1, tree2, repo, stdout);
301 	if (tree1)
302 		got_object_tree_close(tree1);
303 	got_object_tree_close(tree2);
304 	return err;
305 }
306 
307 static const struct got_error *
308 print_commit(struct got_commit_object *commit, struct got_object_id *id,
309     struct got_repository *repo, int show_patch, int verbose)
310 {
311 	const struct got_error *err = NULL;
312 	char *id_str, *logmsg, *line;
313 
314 	err = got_object_id_str(&id_str, id);
315 	if (err)
316 		return err;
317 
318 	printf("-----------------------------------------------\n");
319 	printf("commit %s\n", id_str);
320 	free(id_str);
321 	printf("author: %s\n", commit->author);
322 	if (strcmp(commit->author, commit->committer) != 0)
323 		printf("committer: %s\n", commit->committer);
324 	if (verbose) {
325 		struct got_parent_id *pid;
326 		SIMPLEQ_FOREACH(pid, &commit->parent_ids, entry) {
327 			err = got_object_id_str(&id_str, pid->id);
328 			if (err)
329 				return err;
330 			printf("parent commit: %s\n", id_str);
331 			free(id_str);
332 		}
333 	}
334 
335 	logmsg = strdup(commit->logmsg);
336 	if (logmsg == NULL)
337 		return got_error_from_errno();
338 
339 	do {
340 		line = strsep(&logmsg, "\n");
341 		if (line)
342 			printf(" %s\n", line);
343 	} while (line);
344 	free(logmsg);
345 
346 	if (show_patch) {
347 		err = print_patch(commit, id, repo);
348 		if (err == 0)
349 			printf("\n");
350 	}
351 
352 	return err;
353 }
354 
355 static const struct got_error *
356 print_commits(struct got_object *root_obj, struct got_object_id *root_id,
357     struct got_repository *repo, int show_patch, int limit, int verbose)
358 {
359 	const struct got_error *err;
360 	struct got_commit_graph *graph;
361 	int ncommits;
362 
363 	err = got_commit_graph_open(&graph, root_id, repo);
364 	if (err)
365 		return err;
366 	err = got_commit_graph_iter_start(graph, root_id);
367 	if (err)
368 		return err;
369 	do {
370 		struct got_commit_object *commit;
371 		struct got_object_id *id;
372 
373 		err = got_commit_graph_iter_next(&commit, &id, graph);
374 		if (err) {
375 			if (err->code != GOT_ERR_ITER_NEED_MORE)
376 				break;
377 			err = got_commit_graph_fetch_commits(&ncommits,
378 			    graph, 1, repo);
379 			if (err)
380 				break;
381 			else
382 				continue;
383 		}
384 		if (commit == NULL)
385 			break;
386 		err = print_commit(commit, id, repo, show_patch, verbose);
387 		if (err || (limit && --limit == 0))
388 			break;
389 	} while (ncommits > 0);
390 
391 	got_commit_graph_close(graph);
392 	return err;
393 }
394 
395 __dead static void
396 usage_log(void)
397 {
398 	fprintf(stderr, "usage: %s log [-p] [-c commit] [ -l N ] "
399 	    "[repository-path]\n", getprogname());
400 	exit(1);
401 }
402 
403 static const struct got_error *
404 cmd_log(int argc, char *argv[])
405 {
406 	const struct got_error *error;
407 	struct got_repository *repo;
408 	struct got_object_id *id = NULL;
409 	struct got_object *obj;
410 	char *repo_path = NULL;
411 	char *start_commit = NULL;
412 	int ch;
413 	int show_patch = 0, limit = 0, verbose = 0;
414 	const char *errstr;
415 
416 #ifndef PROFILE
417 	if (pledge("stdio rpath wpath cpath flock proc", NULL) == -1)
418 		err(1, "pledge");
419 #endif
420 
421 	while ((ch = getopt(argc, argv, "pc:l:v")) != -1) {
422 		switch (ch) {
423 		case 'p':
424 			show_patch = 1;
425 			break;
426 		case 'c':
427 			start_commit = optarg;
428 			break;
429 		case 'l':
430 			limit = strtonum(optarg, 1, INT_MAX, &errstr);
431 			if (errstr != NULL)
432 				err(1, "-l option %s", errstr);
433 			break;
434 		case 'v':
435 			verbose = 1;
436 			break;
437 		default:
438 			usage();
439 			/* NOTREACHED */
440 		}
441 	}
442 
443 	argc -= optind;
444 	argv += optind;
445 
446 	if (argc == 0) {
447 		repo_path = getcwd(NULL, 0);
448 		if (repo_path == NULL)
449 			return got_error_from_errno();
450 	} else if (argc == 1) {
451 		repo_path = realpath(argv[0], NULL);
452 		if (repo_path == NULL)
453 			return got_error_from_errno();
454 	} else
455 		usage_log();
456 
457 	error = got_repo_open(&repo, repo_path);
458 	free(repo_path);
459 	if (error != NULL)
460 		return error;
461 
462 	if (start_commit == NULL) {
463 		struct got_reference *head_ref;
464 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
465 		if (error != NULL)
466 			return error;
467 		error = got_ref_resolve(&id, repo, head_ref);
468 		got_ref_close(head_ref);
469 		if (error != NULL)
470 			return error;
471 		error = got_object_open(&obj, repo, id);
472 	} else {
473 		error = got_object_open_by_id_str(&obj, repo, start_commit);
474 		if (error == NULL) {
475 			id = got_object_get_id(obj);
476 			if (id == NULL)
477 				error = got_error_from_errno();
478 		}
479 	}
480 	if (error != NULL)
481 		return error;
482 	if (got_object_get_type(obj) == GOT_OBJ_TYPE_COMMIT)
483 		error = print_commits(obj, id, repo, show_patch, limit,
484 		    verbose);
485 	else
486 		error = got_error(GOT_ERR_OBJ_TYPE);
487 	got_object_close(obj);
488 	free(id);
489 	got_repo_close(repo);
490 	return error;
491 }
492 
493 __dead static void
494 usage_diff(void)
495 {
496 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
497 	    getprogname());
498 	exit(1);
499 }
500 
501 static const struct got_error *
502 cmd_diff(int argc, char *argv[])
503 {
504 	const struct got_error *error;
505 	struct got_repository *repo = NULL;
506 	struct got_object_id *id1 = NULL, *id2 = NULL;
507 	struct got_object *obj1 = NULL, *obj2 = NULL;
508 	char *repo_path = NULL;
509 	char *obj_id_str1 = NULL, *obj_id_str2 = NULL;
510 	int ch;
511 
512 #ifndef PROFILE
513 	if (pledge("stdio rpath wpath cpath flock proc", NULL) == -1)
514 		err(1, "pledge");
515 #endif
516 
517 	while ((ch = getopt(argc, argv, "")) != -1) {
518 		switch (ch) {
519 		default:
520 			usage();
521 			/* NOTREACHED */
522 		}
523 	}
524 
525 	argc -= optind;
526 	argv += optind;
527 
528 	if (argc == 0) {
529 		usage_diff(); /* TODO show local worktree changes */
530 	} else if (argc == 2) {
531 		repo_path = getcwd(NULL, 0);
532 		if (repo_path == NULL)
533 			return got_error_from_errno();
534 		obj_id_str1 = argv[0];
535 		obj_id_str2 = argv[1];
536 	} else if (argc == 3) {
537 		repo_path = realpath(argv[0], NULL);
538 		if (repo_path == NULL)
539 			return got_error_from_errno();
540 		obj_id_str1 = argv[1];
541 		obj_id_str2 = argv[2];
542 	} else
543 		usage_diff();
544 
545 	error = got_repo_open(&repo, repo_path);
546 	free(repo_path);
547 	if (error != NULL)
548 		goto done;
549 
550 	error = got_object_open_by_id_str(&obj1, repo, obj_id_str1);
551 	if (error == NULL) {
552 		id1 = got_object_get_id(obj1);
553 		if (id1 == NULL)
554 			error = got_error_from_errno();
555 	}
556 	if (error != NULL)
557 		goto done;
558 
559 	error = got_object_open_by_id_str(&obj2, repo, obj_id_str2);
560 	if (error == NULL) {
561 		id2 = got_object_get_id(obj2);
562 		if (id2 == NULL)
563 			error = got_error_from_errno();
564 	}
565 	if (error != NULL)
566 		goto done;
567 
568 	if (got_object_get_type(obj1) != got_object_get_type(obj2)) {
569 		error = got_error(GOT_ERR_OBJ_TYPE);
570 		goto done;
571 	}
572 
573 	switch (got_object_get_type(obj1)) {
574 	case GOT_OBJ_TYPE_BLOB:
575 		error = got_diff_objects_as_blobs(obj1, obj2, repo, stdout);
576 		break;
577 	case GOT_OBJ_TYPE_TREE:
578 		error = got_diff_objects_as_trees(obj1, obj2, repo, stdout);
579 		break;
580 	case GOT_OBJ_TYPE_COMMIT:
581 		error = got_diff_objects_as_commits(obj1, obj2, repo, stdout);
582 		break;
583 	default:
584 		error = got_error(GOT_ERR_OBJ_TYPE);
585 	}
586 
587 done:
588 	if (obj1)
589 		got_object_close(obj1);
590 	if (obj2)
591 		got_object_close(obj2);
592 	if (id1)
593 		free(id1);
594 	if (id2)
595 		free(id2);
596 	if (repo)
597 		got_repo_close(repo);
598 	return error;
599 }
600 
601 #ifdef notyet
602 static const struct got_error *
603 cmd_status(int argc __unused, char *argv[] __unused)
604 {
605 	git_repository *repo = NULL;
606 	git_status_list *status;
607 	git_status_options statusopts;
608 	size_t i;
609 
610 	git_libgit2_init();
611 
612 	if (git_repository_open_ext(&repo, ".", 0, NULL))
613 		errx(1, "git_repository_open: %s", giterr_last()->message);
614 
615 	if (git_repository_is_bare(repo))
616 		errx(1, "bar repository");
617 
618 	if (git_status_init_options(&statusopts, GIT_STATUS_OPTIONS_VERSION))
619 		errx(1, "git_status_init_options: %s", giterr_last()->message);
620 
621 	statusopts.show  = GIT_STATUS_SHOW_INDEX_AND_WORKDIR;
622 	statusopts.flags = GIT_STATUS_OPT_INCLUDE_UNTRACKED |
623 	    GIT_STATUS_OPT_RENAMES_HEAD_TO_INDEX |
624 	    GIT_STATUS_OPT_SORT_CASE_SENSITIVELY;
625 
626 	if (git_status_list_new(&status, repo, &statusopts))
627 		errx(1, "git_status_list_new: %s", giterr_last()->message);
628 
629 	for (i = 0; i < git_status_list_entrycount(status); i++) {
630 		const git_status_entry *se;
631 
632 		se = git_status_byindex(status, i);
633 		switch (se->status) {
634 		case GIT_STATUS_WT_NEW:
635 			printf("? %s\n", se->index_to_workdir->new_file.path);
636 			break;
637 		case GIT_STATUS_WT_MODIFIED:
638 			printf("M %s\n", se->index_to_workdir->new_file.path);
639 			break;
640 		case GIT_STATUS_WT_DELETED:
641 			printf("R %s\n", se->index_to_workdir->new_file.path);
642 			break;
643 		case GIT_STATUS_WT_RENAMED:
644 			printf("m %s -> %s\n",
645 			    se->index_to_workdir->old_file.path,
646 			    se->index_to_workdir->new_file.path);
647 			break;
648 		case GIT_STATUS_WT_TYPECHANGE:
649 			printf("t %s\n", se->index_to_workdir->new_file.path);
650 			break;
651 		case GIT_STATUS_INDEX_NEW:
652 			printf("A %s\n", se->head_to_index->new_file.path);
653 			break;
654 		case GIT_STATUS_INDEX_MODIFIED:
655 			printf("M %s\n", se->head_to_index->old_file.path);
656 			break;
657 		case GIT_STATUS_INDEX_DELETED:
658 			printf("R %s\n", se->head_to_index->old_file.path);
659 			break;
660 		case GIT_STATUS_INDEX_RENAMED:
661 			printf("m %s -> %s\n",
662 			    se->head_to_index->old_file.path,
663 			    se->head_to_index->new_file.path);
664 			break;
665 		case GIT_STATUS_INDEX_TYPECHANGE:
666 			printf("t %s\n", se->head_to_index->old_file.path);
667 			break;
668 		case GIT_STATUS_CURRENT:
669 		default:
670 			break;
671 		}
672 	}
673 
674 	git_status_list_free(status);
675 	git_repository_free(repo);
676 	git_libgit2_shutdown();
677 
678 	return 0;
679 }
680 #endif