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