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