prefer git_pathdup to git_path in some possibly-dangerous cases
[git/git.git] / builtin / repack.c
CommitLineData
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1#include "builtin.h"
2#include "cache.h"
3#include "dir.h"
4#include "parse-options.h"
5#include "run-command.h"
6#include "sigchain.h"
7#include "strbuf.h"
8#include "string-list.h"
9#include "argv-array.h"
10
11static int delta_base_offset = 1;
ee34a2be 12static int pack_kept_objects = -1;
2bed2d47 13static int write_bitmaps;
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14static char *packdir, *packtmp;
15
16static const char *const git_repack_usage[] = {
9c9b4f2f 17 N_("git repack [<options>]"),
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18 NULL
19};
20
21static int repack_config(const char *var, const char *value, void *cb)
22{
23 if (!strcmp(var, "repack.usedeltabaseoffset")) {
24 delta_base_offset = git_config_bool(var, value);
25 return 0;
26 }
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27 if (!strcmp(var, "repack.packkeptobjects")) {
28 pack_kept_objects = git_config_bool(var, value);
29 return 0;
30 }
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31 if (!strcmp(var, "repack.writebitmaps") ||
32 !strcmp(var, "pack.writebitmaps")) {
d078d85b 33 write_bitmaps = git_config_bool(var, value);
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34 return 0;
35 }
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36 return git_default_config(var, value, cb);
37}
38
39/*
40 * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
41 */
42static void remove_temporary_files(void)
43{
44 struct strbuf buf = STRBUF_INIT;
45 size_t dirlen, prefixlen;
46 DIR *dir;
47 struct dirent *e;
48
49 dir = opendir(packdir);
50 if (!dir)
51 return;
52
53 /* Point at the slash at the end of ".../objects/pack/" */
54 dirlen = strlen(packdir) + 1;
55 strbuf_addstr(&buf, packtmp);
56 /* Hold the length of ".tmp-%d-pack-" */
57 prefixlen = buf.len - dirlen;
58
59 while ((e = readdir(dir))) {
60 if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
61 continue;
62 strbuf_setlen(&buf, dirlen);
63 strbuf_addstr(&buf, e->d_name);
64 unlink(buf.buf);
65 }
66 closedir(dir);
67 strbuf_release(&buf);
68}
69
70static void remove_pack_on_signal(int signo)
71{
72 remove_temporary_files();
73 sigchain_pop(signo);
74 raise(signo);
75}
76
77/*
78 * Adds all packs hex strings to the fname list, which do not
79 * have a corresponding .keep file.
80 */
81static void get_non_kept_pack_filenames(struct string_list *fname_list)
82{
83 DIR *dir;
84 struct dirent *e;
85 char *fname;
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86
87 if (!(dir = opendir(packdir)))
88 return;
89
90 while ((e = readdir(dir)) != NULL) {
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91 size_t len;
92 if (!strip_suffix(e->d_name, ".pack", &len))
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93 continue;
94
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95 fname = xmemdupz(e->d_name, len);
96
97 if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
98 string_list_append_nodup(fname_list, fname);
99 else
100 free(fname);
101 }
102 closedir(dir);
103}
104
105static void remove_redundant_pack(const char *dir_name, const char *base_name)
106{
5cf2741c 107 const char *exts[] = {".pack", ".idx", ".keep", ".bitmap"};
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108 int i;
109 struct strbuf buf = STRBUF_INIT;
110 size_t plen;
111
112 strbuf_addf(&buf, "%s/%s", dir_name, base_name);
113 plen = buf.len;
114
115 for (i = 0; i < ARRAY_SIZE(exts); i++) {
116 strbuf_setlen(&buf, plen);
117 strbuf_addstr(&buf, exts[i]);
118 unlink(buf.buf);
119 }
120 strbuf_release(&buf);
121}
122
123#define ALL_INTO_ONE 1
124#define LOOSEN_UNREACHABLE 2
125
126int cmd_repack(int argc, const char **argv, const char *prefix)
127{
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128 struct {
129 const char *name;
b77fcd1e 130 unsigned optional:1;
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131 } exts[] = {
132 {".pack"},
133 {".idx"},
5cf2741c 134 {".bitmap", 1},
42a02d85 135 };
d3180279 136 struct child_process cmd = CHILD_PROCESS_INIT;
a1bbc6c0 137 struct string_list_item *item;
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138 struct string_list names = STRING_LIST_INIT_DUP;
139 struct string_list rollback = STRING_LIST_INIT_NODUP;
140 struct string_list existing_packs = STRING_LIST_INIT_DUP;
141 struct strbuf line = STRBUF_INIT;
3e7b066e 142 int ext, ret, failed;
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143 FILE *out;
144
145 /* variables to be filled by option parsing */
146 int pack_everything = 0;
147 int delete_redundant = 0;
aa8bd519 148 const char *unpack_unreachable = NULL;
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149 const char *window = NULL, *window_memory = NULL;
150 const char *depth = NULL;
151 const char *max_pack_size = NULL;
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152 int no_reuse_delta = 0, no_reuse_object = 0;
153 int no_update_server_info = 0;
154 int quiet = 0;
155 int local = 0;
156
157 struct option builtin_repack_options[] = {
158 OPT_BIT('a', NULL, &pack_everything,
159 N_("pack everything in a single pack"), ALL_INTO_ONE),
160 OPT_BIT('A', NULL, &pack_everything,
161 N_("same as -a, and turn unreachable objects loose"),
162 LOOSEN_UNREACHABLE | ALL_INTO_ONE),
163 OPT_BOOL('d', NULL, &delete_redundant,
164 N_("remove redundant packs, and run git-prune-packed")),
165 OPT_BOOL('f', NULL, &no_reuse_delta,
166 N_("pass --no-reuse-delta to git-pack-objects")),
167 OPT_BOOL('F', NULL, &no_reuse_object,
168 N_("pass --no-reuse-object to git-pack-objects")),
169 OPT_BOOL('n', NULL, &no_update_server_info,
170 N_("do not run git-update-server-info")),
171 OPT__QUIET(&quiet, N_("be quiet")),
172 OPT_BOOL('l', "local", &local,
173 N_("pass --local to git-pack-objects")),
d078d85b 174 OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
5cf2741c 175 N_("write bitmap index")),
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176 OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
177 N_("with -A, do not loosen objects older than this")),
b861e235 178 OPT_STRING(0, "window", &window, N_("n"),
a1bbc6c0 179 N_("size of the window used for delta compression")),
b861e235 180 OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
a1bbc6c0 181 N_("same as the above, but limit memory size instead of entries count")),
b861e235 182 OPT_STRING(0, "depth", &depth, N_("n"),
a1bbc6c0 183 N_("limits the maximum delta depth")),
b861e235 184 OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
a1bbc6c0 185 N_("maximum size of each packfile")),
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186 OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
187 N_("repack objects in packs marked with .keep")),
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188 OPT_END()
189 };
190
191 git_config(repack_config, NULL);
192
193 argc = parse_options(argc, argv, prefix, builtin_repack_options,
194 git_repack_usage, 0);
195
ee34a2be 196 if (pack_kept_objects < 0)
2bed2d47 197 pack_kept_objects = write_bitmaps;
ee34a2be 198
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199 packdir = mkpathdup("%s/pack", get_object_directory());
200 packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
201
202 sigchain_push_common(remove_pack_on_signal);
203
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204 argv_array_push(&cmd.args, "pack-objects");
205 argv_array_push(&cmd.args, "--keep-true-parents");
ee34a2be 206 if (!pack_kept_objects)
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207 argv_array_push(&cmd.args, "--honor-pack-keep");
208 argv_array_push(&cmd.args, "--non-empty");
209 argv_array_push(&cmd.args, "--all");
210 argv_array_push(&cmd.args, "--reflog");
211 argv_array_push(&cmd.args, "--indexed-objects");
a1bbc6c0 212 if (window)
a2bae2dc 213 argv_array_pushf(&cmd.args, "--window=%s", window);
a1bbc6c0 214 if (window_memory)
a2bae2dc 215 argv_array_pushf(&cmd.args, "--window-memory=%s", window_memory);
a1bbc6c0 216 if (depth)
a2bae2dc 217 argv_array_pushf(&cmd.args, "--depth=%s", depth);
a1bbc6c0 218 if (max_pack_size)
a2bae2dc 219 argv_array_pushf(&cmd.args, "--max-pack-size=%s", max_pack_size);
a1bbc6c0 220 if (no_reuse_delta)
a2bae2dc 221 argv_array_pushf(&cmd.args, "--no-reuse-delta");
a1bbc6c0 222 if (no_reuse_object)
a2bae2dc 223 argv_array_pushf(&cmd.args, "--no-reuse-object");
2bed2d47 224 if (write_bitmaps)
a2bae2dc 225 argv_array_push(&cmd.args, "--write-bitmap-index");
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226
227 if (pack_everything & ALL_INTO_ONE) {
228 get_non_kept_pack_filenames(&existing_packs);
229
230 if (existing_packs.nr && delete_redundant) {
8d422993 231 if (unpack_unreachable) {
a2bae2dc 232 argv_array_pushf(&cmd.args,
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233 "--unpack-unreachable=%s",
234 unpack_unreachable);
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235 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
236 } else if (pack_everything & LOOSEN_UNREACHABLE) {
a2bae2dc 237 argv_array_push(&cmd.args,
a1bbc6c0 238 "--unpack-unreachable");
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239 } else {
240 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
241 }
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242 }
243 } else {
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244 argv_array_push(&cmd.args, "--unpacked");
245 argv_array_push(&cmd.args, "--incremental");
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246 }
247
248 if (local)
a2bae2dc 249 argv_array_push(&cmd.args, "--local");
a1bbc6c0 250 if (quiet)
a2bae2dc 251 argv_array_push(&cmd.args, "--quiet");
a1bbc6c0 252 if (delta_base_offset)
a2bae2dc 253 argv_array_push(&cmd.args, "--delta-base-offset");
a1bbc6c0 254
a2bae2dc 255 argv_array_push(&cmd.args, packtmp);
a1bbc6c0 256
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257 cmd.git_cmd = 1;
258 cmd.out = -1;
259 cmd.no_stdin = 1;
260
261 ret = start_command(&cmd);
262 if (ret)
ffc9329f 263 return ret;
a1bbc6c0 264
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265 out = xfdopen(cmd.out, "r");
266 while (strbuf_getline(&line, out, '\n') != EOF) {
267 if (line.len != 40)
268 die("repack: Expecting 40 character sha1 lines only from pack-objects.");
269 string_list_append(&names, line.buf);
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270 }
271 fclose(out);
272 ret = finish_command(&cmd);
273 if (ret)
ffc9329f 274 return ret;
a1bbc6c0 275
3e7b066e 276 if (!names.nr && !quiet)
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277 printf("Nothing new to pack.\n");
278
279 /*
280 * Ok we have prepared all new packfiles.
281 * First see if there are packs of the same name and if so
282 * if we can move them out of the way (this can happen if we
283 * repacked immediately after packing fully.
284 */
285 failed = 0;
286 for_each_string_list_item(item, &names) {
b328c216 287 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
dcf69262
NTND
288 const char *fname_old;
289 char *fname;
9d7fbfd2 290 fname = mkpathdup("%s/pack-%s%s", packdir,
42a02d85 291 item->string, exts[ext].name);
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292 if (!file_exists(fname)) {
293 free(fname);
294 continue;
295 }
296
297 fname_old = mkpath("%s/old-%s%s", packdir,
42a02d85 298 item->string, exts[ext].name);
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299 if (file_exists(fname_old))
300 if (unlink(fname_old))
301 failed = 1;
302
303 if (!failed && rename(fname, fname_old)) {
304 free(fname);
305 failed = 1;
306 break;
307 } else {
308 string_list_append(&rollback, fname);
309 }
310 }
311 if (failed)
312 break;
313 }
314 if (failed) {
315 struct string_list rollback_failure = STRING_LIST_INIT_DUP;
316 for_each_string_list_item(item, &rollback) {
dcf69262
NTND
317 const char *fname_old;
318 char *fname;
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319 fname = mkpathdup("%s/%s", packdir, item->string);
320 fname_old = mkpath("%s/old-%s", packdir, item->string);
321 if (rename(fname_old, fname))
322 string_list_append(&rollback_failure, fname);
323 free(fname);
324 }
325
326 if (rollback_failure.nr) {
327 int i;
328 fprintf(stderr,
329 "WARNING: Some packs in use have been renamed by\n"
330 "WARNING: prefixing old- to their name, in order to\n"
331 "WARNING: replace them with the new version of the\n"
332 "WARNING: file. But the operation failed, and the\n"
333 "WARNING: attempt to rename them back to their\n"
334 "WARNING: original names also failed.\n"
335 "WARNING: Please rename them in %s manually:\n", packdir);
336 for (i = 0; i < rollback_failure.nr; i++)
337 fprintf(stderr, "WARNING: old-%s -> %s\n",
338 rollback_failure.items[i].string,
339 rollback_failure.items[i].string);
340 }
341 exit(1);
342 }
343
344 /* Now the ones with the same name are out of the way... */
345 for_each_string_list_item(item, &names) {
b328c216 346 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
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347 char *fname, *fname_old;
348 struct stat statbuffer;
b77fcd1e 349 int exists = 0;
a1bbc6c0 350 fname = mkpathdup("%s/pack-%s%s",
42a02d85 351 packdir, item->string, exts[ext].name);
a1bbc6c0 352 fname_old = mkpathdup("%s-%s%s",
42a02d85 353 packtmp, item->string, exts[ext].name);
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354 if (!stat(fname_old, &statbuffer)) {
355 statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
356 chmod(fname_old, statbuffer.st_mode);
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357 exists = 1;
358 }
359 if (exists || !exts[ext].optional) {
360 if (rename(fname_old, fname))
361 die_errno(_("renaming '%s' failed"), fname_old);
a1bbc6c0 362 }
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363 free(fname);
364 free(fname_old);
365 }
366 }
367
368 /* Remove the "old-" files */
369 for_each_string_list_item(item, &names) {
b328c216 370 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
dcf69262 371 const char *fname;
9d7fbfd2 372 fname = mkpath("%s/old-%s%s",
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373 packdir,
374 item->string,
42a02d85 375 exts[ext].name);
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376 if (remove_path(fname))
377 warning(_("removing '%s' failed"), fname);
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378 }
379 }
380
381 /* End of pack replacement. */
382
383 if (delete_redundant) {
4489a480 384 int opts = 0;
3383e199 385 string_list_sort(&names);
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386 for_each_string_list_item(item, &existing_packs) {
387 char *sha1;
388 size_t len = strlen(item->string);
389 if (len < 40)
390 continue;
391 sha1 = item->string + len - 40;
392 if (!string_list_has_string(&names, sha1))
393 remove_redundant_pack(packdir, item->string);
394 }
4489a480
RS
395 if (!quiet && isatty(2))
396 opts |= PRUNE_PACKED_VERBOSE;
397 prune_packed_objects(opts);
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398 }
399
4489a480
RS
400 if (!no_update_server_info)
401 update_server_info(0);
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402 remove_temporary_files();
403 string_list_clear(&names, 0);
404 string_list_clear(&rollback, 0);
405 string_list_clear(&existing_packs, 0);
406 strbuf_release(&line);
407
408 return 0;
409}