Sync with v2.1.4
[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                 sort_string_list(&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 }