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