strbuf: introduce strbuf_getline_{lf,nul}()
[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 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;
142 int ext, ret, failed;
143 FILE *out;
144
145 /* variables to be filled by option parsing */
146 int pack_everything = 0;
147 int delete_redundant = 0;
148 const char *unpack_unreachable = NULL;
149 const char *window = NULL, *window_memory = NULL;
150 const char *depth = NULL;
151 const char *max_pack_size = NULL;
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")),
174 OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
175 N_("write bitmap index")),
176 OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
177 N_("with -A, do not loosen objects older than this")),
178 OPT_STRING(0, "window", &window, N_("n"),
179 N_("size of the window used for delta compression")),
180 OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
181 N_("same as the above, but limit memory size instead of entries count")),
182 OPT_STRING(0, "depth", &depth, N_("n"),
183 N_("limits the maximum delta depth")),
184 OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
185 N_("maximum size of each packfile")),
186 OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
187 N_("repack objects in packs marked with .keep")),
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
196 if (delete_redundant && repository_format_precious_objects)
197 die(_("cannot delete packs in a precious-objects repo"));
198
199 if (pack_kept_objects < 0)
200 pack_kept_objects = write_bitmaps;
201
202 packdir = mkpathdup("%s/pack", get_object_directory());
203 packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
204
205 sigchain_push_common(remove_pack_on_signal);
206
207 argv_array_push(&cmd.args, "pack-objects");
208 argv_array_push(&cmd.args, "--keep-true-parents");
209 if (!pack_kept_objects)
210 argv_array_push(&cmd.args, "--honor-pack-keep");
211 argv_array_push(&cmd.args, "--non-empty");
212 argv_array_push(&cmd.args, "--all");
213 argv_array_push(&cmd.args, "--reflog");
214 argv_array_push(&cmd.args, "--indexed-objects");
215 if (window)
216 argv_array_pushf(&cmd.args, "--window=%s", window);
217 if (window_memory)
218 argv_array_pushf(&cmd.args, "--window-memory=%s", window_memory);
219 if (depth)
220 argv_array_pushf(&cmd.args, "--depth=%s", depth);
221 if (max_pack_size)
222 argv_array_pushf(&cmd.args, "--max-pack-size=%s", max_pack_size);
223 if (no_reuse_delta)
224 argv_array_pushf(&cmd.args, "--no-reuse-delta");
225 if (no_reuse_object)
226 argv_array_pushf(&cmd.args, "--no-reuse-object");
227 if (write_bitmaps)
228 argv_array_push(&cmd.args, "--write-bitmap-index");
229
230 if (pack_everything & ALL_INTO_ONE) {
231 get_non_kept_pack_filenames(&existing_packs);
232
233 if (existing_packs.nr && delete_redundant) {
234 if (unpack_unreachable) {
235 argv_array_pushf(&cmd.args,
236 "--unpack-unreachable=%s",
237 unpack_unreachable);
238 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
239 } else if (pack_everything & LOOSEN_UNREACHABLE) {
240 argv_array_push(&cmd.args,
241 "--unpack-unreachable");
242 } else {
243 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
244 }
245 }
246 } else {
247 argv_array_push(&cmd.args, "--unpacked");
248 argv_array_push(&cmd.args, "--incremental");
249 }
250
251 if (local)
252 argv_array_push(&cmd.args, "--local");
253 if (quiet)
254 argv_array_push(&cmd.args, "--quiet");
255 if (delta_base_offset)
256 argv_array_push(&cmd.args, "--delta-base-offset");
257
258 argv_array_push(&cmd.args, packtmp);
259
260 cmd.git_cmd = 1;
261 cmd.out = -1;
262 cmd.no_stdin = 1;
263
264 ret = start_command(&cmd);
265 if (ret)
266 return ret;
267
268 out = xfdopen(cmd.out, "r");
269 while (strbuf_getline_lf(&line, out) != EOF) {
270 if (line.len != 40)
271 die("repack: Expecting 40 character sha1 lines only from pack-objects.");
272 string_list_append(&names, line.buf);
273 }
274 fclose(out);
275 ret = finish_command(&cmd);
276 if (ret)
277 return ret;
278
279 if (!names.nr && !quiet)
280 printf("Nothing new to pack.\n");
281
282 /*
283 * Ok we have prepared all new packfiles.
284 * First see if there are packs of the same name and if so
285 * if we can move them out of the way (this can happen if we
286 * repacked immediately after packing fully.
287 */
288 failed = 0;
289 for_each_string_list_item(item, &names) {
290 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
291 char *fname, *fname_old;
292 fname = mkpathdup("%s/pack-%s%s", packdir,
293 item->string, exts[ext].name);
294 if (!file_exists(fname)) {
295 free(fname);
296 continue;
297 }
298
299 fname_old = mkpathdup("%s/old-%s%s", packdir,
300 item->string, exts[ext].name);
301 if (file_exists(fname_old))
302 if (unlink(fname_old))
303 failed = 1;
304
305 if (!failed && rename(fname, fname_old)) {
306 free(fname);
307 free(fname_old);
308 failed = 1;
309 break;
310 } else {
311 string_list_append(&rollback, fname);
312 free(fname_old);
313 }
314 }
315 if (failed)
316 break;
317 }
318 if (failed) {
319 struct string_list rollback_failure = STRING_LIST_INIT_DUP;
320 for_each_string_list_item(item, &rollback) {
321 char *fname, *fname_old;
322 fname = mkpathdup("%s/%s", packdir, item->string);
323 fname_old = mkpathdup("%s/old-%s", packdir, item->string);
324 if (rename(fname_old, fname))
325 string_list_append(&rollback_failure, fname);
326 free(fname);
327 free(fname_old);
328 }
329
330 if (rollback_failure.nr) {
331 int i;
332 fprintf(stderr,
333 "WARNING: Some packs in use have been renamed by\n"
334 "WARNING: prefixing old- to their name, in order to\n"
335 "WARNING: replace them with the new version of the\n"
336 "WARNING: file. But the operation failed, and the\n"
337 "WARNING: attempt to rename them back to their\n"
338 "WARNING: original names also failed.\n"
339 "WARNING: Please rename them in %s manually:\n", packdir);
340 for (i = 0; i < rollback_failure.nr; i++)
341 fprintf(stderr, "WARNING: old-%s -> %s\n",
342 rollback_failure.items[i].string,
343 rollback_failure.items[i].string);
344 }
345 exit(1);
346 }
347
348 /* Now the ones with the same name are out of the way... */
349 for_each_string_list_item(item, &names) {
350 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
351 char *fname, *fname_old;
352 struct stat statbuffer;
353 int exists = 0;
354 fname = mkpathdup("%s/pack-%s%s",
355 packdir, item->string, exts[ext].name);
356 fname_old = mkpathdup("%s-%s%s",
357 packtmp, item->string, exts[ext].name);
358 if (!stat(fname_old, &statbuffer)) {
359 statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
360 chmod(fname_old, statbuffer.st_mode);
361 exists = 1;
362 }
363 if (exists || !exts[ext].optional) {
364 if (rename(fname_old, fname))
365 die_errno(_("renaming '%s' failed"), fname_old);
366 }
367 free(fname);
368 free(fname_old);
369 }
370 }
371
372 /* Remove the "old-" files */
373 for_each_string_list_item(item, &names) {
374 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
375 char *fname;
376 fname = mkpathdup("%s/old-%s%s",
377 packdir,
378 item->string,
379 exts[ext].name);
380 if (remove_path(fname))
381 warning(_("removing '%s' failed"), fname);
382 free(fname);
383 }
384 }
385
386 /* End of pack replacement. */
387
388 if (delete_redundant) {
389 int opts = 0;
390 string_list_sort(&names);
391 for_each_string_list_item(item, &existing_packs) {
392 char *sha1;
393 size_t len = strlen(item->string);
394 if (len < 40)
395 continue;
396 sha1 = item->string + len - 40;
397 if (!string_list_has_string(&names, sha1))
398 remove_redundant_pack(packdir, item->string);
399 }
400 if (!quiet && isatty(2))
401 opts |= PRUNE_PACKED_VERBOSE;
402 prune_packed_objects(opts);
403 }
404
405 if (!no_update_server_info)
406 update_server_info(0);
407 remove_temporary_files();
408 string_list_clear(&names, 0);
409 string_list_clear(&rollback, 0);
410 string_list_clear(&existing_packs, 0);
411 strbuf_release(&line);
412
413 return 0;
414 }