1#include "builtin.h"
2#include "cache.h"
3#include "config.h"
4#include "dir.h"
5#include "parse-options.h"
6#include "run-command.h"
7#include "sigchain.h"
8#include "strbuf.h"
9#include "string-list.h"
10#include "argv-array.h"
11static int delta_base_offset = 1;
13static int pack_kept_objects = -1;
14static int write_bitmaps;
15static char *packdir, *packtmp;
16static const char *const git_repack_usage[] = {
18 N_("git repack [<options>]"),
19 NULL
20};
21static const char incremental_bitmap_conflict_error[] = N_(
23"Incremental repacks are incompatible with bitmap indexes. Use\n"
24"--no-write-bitmap-index or disable the pack.writebitmaps configuration."
25);
26static int repack_config(const char *var, const char *value, void *cb)
29{
30 if (!strcmp(var, "repack.usedeltabaseoffset")) {
31 delta_base_offset = git_config_bool(var, value);
32 return 0;
33 }
34 if (!strcmp(var, "repack.packkeptobjects")) {
35 pack_kept_objects = git_config_bool(var, value);
36 return 0;
37 }
38 if (!strcmp(var, "repack.writebitmaps") ||
39 !strcmp(var, "pack.writebitmaps")) {
40 write_bitmaps = git_config_bool(var, value);
41 return 0;
42 }
43 return git_default_config(var, value, cb);
44}
45/*
47 * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
48 */
49static void remove_temporary_files(void)
50{
51 struct strbuf buf = STRBUF_INIT;
52 size_t dirlen, prefixlen;
53 DIR *dir;
54 struct dirent *e;
55 dir = opendir(packdir);
57 if (!dir)
58 return;
59 /* Point at the slash at the end of ".../objects/pack/" */
61 dirlen = strlen(packdir) + 1;
62 strbuf_addstr(&buf, packtmp);
63 /* Hold the length of ".tmp-%d-pack-" */
64 prefixlen = buf.len - dirlen;
65 while ((e = readdir(dir))) {
67 if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
68 continue;
69 strbuf_setlen(&buf, dirlen);
70 strbuf_addstr(&buf, e->d_name);
71 unlink(buf.buf);
72 }
73 closedir(dir);
74 strbuf_release(&buf);
75}
76static void remove_pack_on_signal(int signo)
78{
79 remove_temporary_files();
80 sigchain_pop(signo);
81 raise(signo);
82}
83/*
85 * Adds all packs hex strings to the fname list, which do not
86 * have a corresponding .keep or .promisor file. These packs are not to
87 * be kept if we are going to pack everything into one file.
88 */
89static void get_non_kept_pack_filenames(struct string_list *fname_list,
90 const struct string_list *extra_keep)
91{
92 DIR *dir;
93 struct dirent *e;
94 char *fname;
95 if (!(dir = opendir(packdir)))
97 return;
98 while ((e = readdir(dir)) != NULL) {
100 size_t len;
101 int i;
102 for (i = 0; i < extra_keep->nr; i++)
104 if (!fspathcmp(e->d_name, extra_keep->items[i].string))
105 break;
106 if (extra_keep->nr > 0 && i < extra_keep->nr)
107 continue;
108 if (!strip_suffix(e->d_name, ".pack", &len))
110 continue;
111 fname = xmemdupz(e->d_name, len);
113 if (!file_exists(mkpath("%s/%s.keep", packdir, fname)) &&
115 !file_exists(mkpath("%s/%s.promisor", packdir, fname)))
116 string_list_append_nodup(fname_list, fname);
117 else
118 free(fname);
119 }
120 closedir(dir);
121}
122static void remove_redundant_pack(const char *dir_name, const char *base_name)
124{
125 const char *exts[] = {".pack", ".idx", ".keep", ".bitmap"};
126 int i;
127 struct strbuf buf = STRBUF_INIT;
128 size_t plen;
129 strbuf_addf(&buf, "%s/%s", dir_name, base_name);
131 plen = buf.len;
132 for (i = 0; i < ARRAY_SIZE(exts); i++) {
134 strbuf_setlen(&buf, plen);
135 strbuf_addstr(&buf, exts[i]);
136 unlink(buf.buf);
137 }
138 strbuf_release(&buf);
139}
140#define ALL_INTO_ONE 1
142#define LOOSEN_UNREACHABLE 2
143int cmd_repack(int argc, const char **argv, const char *prefix)
145{
146 struct {
147 const char *name;
148 unsigned optional:1;
149 } exts[] = {
150 {".pack"},
151 {".idx"},
152 {".bitmap", 1},
153 };
154 struct child_process cmd = CHILD_PROCESS_INIT;
155 struct string_list_item *item;
156 struct string_list names = STRING_LIST_INIT_DUP;
157 struct string_list rollback = STRING_LIST_INIT_NODUP;
158 struct string_list existing_packs = STRING_LIST_INIT_DUP;
159 struct strbuf line = STRBUF_INIT;
160 int i, ext, ret, failed;
161 FILE *out;
162 /* variables to be filled by option parsing */
164 int pack_everything = 0;
165 int delete_redundant = 0;
166 const char *unpack_unreachable = NULL;
167 int keep_unreachable = 0;
168 const char *window = NULL, *window_memory = NULL;
169 const char *depth = NULL;
170 const char *threads = NULL;
171 const char *max_pack_size = NULL;
172 struct string_list keep_pack_list = STRING_LIST_INIT_NODUP;
173 int no_reuse_delta = 0, no_reuse_object = 0;
174 int no_update_server_info = 0;
175 int quiet = 0;
176 int local = 0;
177 struct option builtin_repack_options[] = {
179 OPT_BIT('a', NULL, &pack_everything,
180 N_("pack everything in a single pack"), ALL_INTO_ONE),
181 OPT_BIT('A', NULL, &pack_everything,
182 N_("same as -a, and turn unreachable objects loose"),
183 LOOSEN_UNREACHABLE | ALL_INTO_ONE),
184 OPT_BOOL('d', NULL, &delete_redundant,
185 N_("remove redundant packs, and run git-prune-packed")),
186 OPT_BOOL('f', NULL, &no_reuse_delta,
187 N_("pass --no-reuse-delta to git-pack-objects")),
188 OPT_BOOL('F', NULL, &no_reuse_object,
189 N_("pass --no-reuse-object to git-pack-objects")),
190 OPT_BOOL('n', NULL, &no_update_server_info,
191 N_("do not run git-update-server-info")),
192 OPT__QUIET(&quiet, N_("be quiet")),
193 OPT_BOOL('l', "local", &local,
194 N_("pass --local to git-pack-objects")),
195 OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
196 N_("write bitmap index")),
197 OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
198 N_("with -A, do not loosen objects older than this")),
199 OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
200 N_("with -a, repack unreachable objects")),
201 OPT_STRING(0, "window", &window, N_("n"),
202 N_("size of the window used for delta compression")),
203 OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
204 N_("same as the above, but limit memory size instead of entries count")),
205 OPT_STRING(0, "depth", &depth, N_("n"),
206 N_("limits the maximum delta depth")),
207 OPT_STRING(0, "threads", &threads, N_("n"),
208 N_("limits the maximum number of threads")),
209 OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
210 N_("maximum size of each packfile")),
211 OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
212 N_("repack objects in packs marked with .keep")),
213 OPT_STRING_LIST(0, "keep-pack", &keep_pack_list, N_("name"),
214 N_("do not repack this pack")),
215 OPT_END()
216 };
217 git_config(repack_config, NULL);
219 argc = parse_options(argc, argv, prefix, builtin_repack_options,
221 git_repack_usage, 0);
222 if (delete_redundant && repository_format_precious_objects)
224 die(_("cannot delete packs in a precious-objects repo"));
225 if (keep_unreachable &&
227 (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
228 die(_("--keep-unreachable and -A are incompatible"));
229 if (pack_kept_objects < 0)
231 pack_kept_objects = write_bitmaps;
232 if (write_bitmaps && !(pack_everything & ALL_INTO_ONE))
234 die(_(incremental_bitmap_conflict_error));
235 packdir = mkpathdup("%s/pack", get_object_directory());
237 packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
238 sigchain_push_common(remove_pack_on_signal);
240 argv_array_push(&cmd.args, "pack-objects");
242 argv_array_push(&cmd.args, "--keep-true-parents");
243 if (!pack_kept_objects)
244 argv_array_push(&cmd.args, "--honor-pack-keep");
245 for (i = 0; i < keep_pack_list.nr; i++)
246 argv_array_pushf(&cmd.args, "--keep-pack=%s",
247 keep_pack_list.items[i].string);
248 argv_array_push(&cmd.args, "--non-empty");
249 argv_array_push(&cmd.args, "--all");
250 argv_array_push(&cmd.args, "--reflog");
251 argv_array_push(&cmd.args, "--indexed-objects");
252 if (repository_format_partial_clone)
253 argv_array_push(&cmd.args, "--exclude-promisor-objects");
254 if (window)
255 argv_array_pushf(&cmd.args, "--window=%s", window);
256 if (window_memory)
257 argv_array_pushf(&cmd.args, "--window-memory=%s", window_memory);
258 if (depth)
259 argv_array_pushf(&cmd.args, "--depth=%s", depth);
260 if (threads)
261 argv_array_pushf(&cmd.args, "--threads=%s", threads);
262 if (max_pack_size)
263 argv_array_pushf(&cmd.args, "--max-pack-size=%s", max_pack_size);
264 if (no_reuse_delta)
265 argv_array_pushf(&cmd.args, "--no-reuse-delta");
266 if (no_reuse_object)
267 argv_array_pushf(&cmd.args, "--no-reuse-object");
268 if (write_bitmaps)
269 argv_array_push(&cmd.args, "--write-bitmap-index");
270 if (pack_everything & ALL_INTO_ONE) {
272 get_non_kept_pack_filenames(&existing_packs, &keep_pack_list);
273 if (existing_packs.nr && delete_redundant) {
275 if (unpack_unreachable) {
276 argv_array_pushf(&cmd.args,
277 "--unpack-unreachable=%s",
278 unpack_unreachable);
279 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
280 } else if (pack_everything & LOOSEN_UNREACHABLE) {
281 argv_array_push(&cmd.args,
282 "--unpack-unreachable");
283 } else if (keep_unreachable) {
284 argv_array_push(&cmd.args, "--keep-unreachable");
285 argv_array_push(&cmd.args, "--pack-loose-unreachable");
286 } else {
287 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
288 }
289 }
290 } else {
291 argv_array_push(&cmd.args, "--unpacked");
292 argv_array_push(&cmd.args, "--incremental");
293 }
294 if (local)
296 argv_array_push(&cmd.args, "--local");
297 if (quiet)
298 argv_array_push(&cmd.args, "--quiet");
299 if (delta_base_offset)
300 argv_array_push(&cmd.args, "--delta-base-offset");
301 argv_array_push(&cmd.args, packtmp);
303 cmd.git_cmd = 1;
305 cmd.out = -1;
306 cmd.no_stdin = 1;
307 ret = start_command(&cmd);
309 if (ret)
310 return ret;
311 out = xfdopen(cmd.out, "r");
313 while (strbuf_getline_lf(&line, out) != EOF) {
314 if (line.len != 40)
315 die("repack: Expecting 40 character sha1 lines only from pack-objects.");
316 string_list_append(&names, line.buf);
317 }
318 fclose(out);
319 ret = finish_command(&cmd);
320 if (ret)
321 return ret;
322 if (!names.nr && !quiet)
324 printf("Nothing new to pack.\n");
325 /*
327 * Ok we have prepared all new packfiles.
328 * First see if there are packs of the same name and if so
329 * if we can move them out of the way (this can happen if we
330 * repacked immediately after packing fully.
331 */
332 failed = 0;
333 for_each_string_list_item(item, &names) {
334 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
335 char *fname, *fname_old;
336 fname = mkpathdup("%s/pack-%s%s", packdir,
337 item->string, exts[ext].name);
338 if (!file_exists(fname)) {
339 free(fname);
340 continue;
341 }
342 fname_old = mkpathdup("%s/old-%s%s", packdir,
344 item->string, exts[ext].name);
345 if (file_exists(fname_old))
346 if (unlink(fname_old))
347 failed = 1;
348 if (!failed && rename(fname, fname_old)) {
350 free(fname);
351 free(fname_old);
352 failed = 1;
353 break;
354 } else {
355 string_list_append(&rollback, fname);
356 free(fname_old);
357 }
358 }
359 if (failed)
360 break;
361 }
362 if (failed) {
363 struct string_list rollback_failure = STRING_LIST_INIT_DUP;
364 for_each_string_list_item(item, &rollback) {
365 char *fname, *fname_old;
366 fname = mkpathdup("%s/%s", packdir, item->string);
367 fname_old = mkpathdup("%s/old-%s", packdir, item->string);
368 if (rename(fname_old, fname))
369 string_list_append(&rollback_failure, fname);
370 free(fname);
371 free(fname_old);
372 }
373 if (rollback_failure.nr) {
375 int i;
376 fprintf(stderr,
377 "WARNING: Some packs in use have been renamed by\n"
378 "WARNING: prefixing old- to their name, in order to\n"
379 "WARNING: replace them with the new version of the\n"
380 "WARNING: file. But the operation failed, and the\n"
381 "WARNING: attempt to rename them back to their\n"
382 "WARNING: original names also failed.\n"
383 "WARNING: Please rename them in %s manually:\n", packdir);
384 for (i = 0; i < rollback_failure.nr; i++)
385 fprintf(stderr, "WARNING: old-%s -> %s\n",
386 rollback_failure.items[i].string,
387 rollback_failure.items[i].string);
388 }
389 exit(1);
390 }
391 /* Now the ones with the same name are out of the way... */
393 for_each_string_list_item(item, &names) {
394 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
395 char *fname, *fname_old;
396 struct stat statbuffer;
397 int exists = 0;
398 fname = mkpathdup("%s/pack-%s%s",
399 packdir, item->string, exts[ext].name);
400 fname_old = mkpathdup("%s-%s%s",
401 packtmp, item->string, exts[ext].name);
402 if (!stat(fname_old, &statbuffer)) {
403 statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
404 chmod(fname_old, statbuffer.st_mode);
405 exists = 1;
406 }
407 if (exists || !exts[ext].optional) {
408 if (rename(fname_old, fname))
409 die_errno(_("renaming '%s' failed"), fname_old);
410 }
411 free(fname);
412 free(fname_old);
413 }
414 }
415 /* Remove the "old-" files */
417 for_each_string_list_item(item, &names) {
418 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
419 char *fname;
420 fname = mkpathdup("%s/old-%s%s",
421 packdir,
422 item->string,
423 exts[ext].name);
424 if (remove_path(fname))
425 warning(_("failed to remove '%s'"), fname);
426 free(fname);
427 }
428 }
429 /* End of pack replacement. */
431 if (delete_redundant) {
433 int opts = 0;
434 string_list_sort(&names);
435 for_each_string_list_item(item, &existing_packs) {
436 char *sha1;
437 size_t len = strlen(item->string);
438 if (len < 40)
439 continue;
440 sha1 = item->string + len - 40;
441 if (!string_list_has_string(&names, sha1))
442 remove_redundant_pack(packdir, item->string);
443 }
444 if (!quiet && isatty(2))
445 opts |= PRUNE_PACKED_VERBOSE;
446 prune_packed_objects(opts);
447 }
448 if (!no_update_server_info)
450 update_server_info(0);
451 remove_temporary_files();
452 string_list_clear(&names, 0);
453 string_list_clear(&rollback, 0);
454 string_list_clear(&existing_packs, 0);
455 strbuf_release(&line);
456 return 0;
458}