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         size_t len;
  87
  88         if (!(dir = opendir(packdir)))
  89                 return;
  90
  91         while ((e = readdir(dir)) != NULL) {
  92                 if (suffixcmp(e->d_name, ".pack"))
  93                         continue;
  94
  95                 len = strlen(e->d_name) - strlen(".pack");
  96                 fname = xmemdupz(e->d_name, len);
  97
  98                 if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
  99                         string_list_append_nodup(fname_list, fname);
 100                 else
 101                         free(fname);
 102         }
 103         closedir(dir);
 104 }
 105
 106 static void remove_redundant_pack(const char *dir_name, const char *base_name)
 107 {
 108         const char *exts[] = {".pack", ".idx", ".keep", ".bitmap"};
 109         int i;
 110         struct strbuf buf = STRBUF_INIT;
 111         size_t plen;
 112
 113         strbuf_addf(&buf, "%s/%s", dir_name, base_name);
 114         plen = buf.len;
 115
 116         for (i = 0; i < ARRAY_SIZE(exts); i++) {
 117                 strbuf_setlen(&buf, plen);
 118                 strbuf_addstr(&buf, exts[i]);
 119                 unlink(buf.buf);
 120         }
 121         strbuf_release(&buf);
 122 }
 123
 124 #define ALL_INTO_ONE 1
 125 #define LOOSEN_UNREACHABLE 2
 126
 127 int cmd_repack(int argc, const char **argv, const char *prefix)
 128 {
 129         struct {
 130                 const char *name;
 131                 unsigned optional:1;
 132         } exts[] = {
 133                 {".pack"},
 134                 {".idx"},
 135                 {".bitmap", 1},
 136         };
 137         struct child_process cmd;
 138         struct string_list_item *item;
 139         struct argv_array cmd_args = ARGV_ARRAY_INIT;
 140         struct string_list names = STRING_LIST_INIT_DUP;
 141         struct string_list rollback = STRING_LIST_INIT_NODUP;
 142         struct string_list existing_packs = STRING_LIST_INIT_DUP;
 143         struct strbuf line = STRBUF_INIT;
 144         int nr_packs, ext, ret, failed;
 145         FILE *out;
 146
 147         /* variables to be filled by option parsing */
 148         int pack_everything = 0;
 149         int delete_redundant = 0;
 150         char *unpack_unreachable = NULL;
 151         int window = 0, window_memory = 0;
 152         int depth = 0;
 153         int max_pack_size = 0;
 154         int no_reuse_delta = 0, no_reuse_object = 0;
 155         int no_update_server_info = 0;
 156         int quiet = 0;
 157         int local = 0;
 158
 159         struct option builtin_repack_options[] = {
 160                 OPT_BIT('a', NULL, &pack_everything,
 161                                 N_("pack everything in a single pack"), ALL_INTO_ONE),
 162                 OPT_BIT('A', NULL, &pack_everything,
 163                                 N_("same as -a, and turn unreachable objects loose"),
 164                                    LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 165                 OPT_BOOL('d', NULL, &delete_redundant,
 166                                 N_("remove redundant packs, and run git-prune-packed")),
 167                 OPT_BOOL('f', NULL, &no_reuse_delta,
 168                                 N_("pass --no-reuse-delta to git-pack-objects")),
 169                 OPT_BOOL('F', NULL, &no_reuse_object,
 170                                 N_("pass --no-reuse-object to git-pack-objects")),
 171                 OPT_BOOL('n', NULL, &no_update_server_info,
 172                                 N_("do not run git-update-server-info")),
 173                 OPT__QUIET(&quiet, N_("be quiet")),
 174                 OPT_BOOL('l', "local", &local,
 175                                 N_("pass --local to git-pack-objects")),
 176                 OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
 177                                 N_("write bitmap index")),
 178                 OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 179                                 N_("with -A, do not loosen objects older than this")),
 180                 OPT_INTEGER(0, "window", &window,
 181                                 N_("size of the window used for delta compression")),
 182                 OPT_INTEGER(0, "window-memory", &window_memory,
 183                                 N_("same as the above, but limit memory size instead of entries count")),
 184                 OPT_INTEGER(0, "depth", &depth,
 185                                 N_("limits the maximum delta depth")),
 186                 OPT_INTEGER(0, "max-pack-size", &max_pack_size,
 187                                 N_("maximum size of each packfile")),
 188                 OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
 189                                 N_("repack objects in packs marked with .keep")),
 190                 OPT_END()
 191         };
 192
 193         git_config(repack_config, NULL);
 194
 195         argc = parse_options(argc, argv, prefix, builtin_repack_options,
 196                                 git_repack_usage, 0);
 197
 198         if (pack_kept_objects < 0)
 199                 pack_kept_objects = write_bitmaps;
 200
 201         packdir = mkpathdup("%s/pack", get_object_directory());
 202         packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
 203
 204         sigchain_push_common(remove_pack_on_signal);
 205
 206         argv_array_push(&cmd_args, "pack-objects");
 207         argv_array_push(&cmd_args, "--keep-true-parents");
 208         if (!pack_kept_objects)
 209                 argv_array_push(&cmd_args, "--honor-pack-keep");
 210         argv_array_push(&cmd_args, "--non-empty");
 211         argv_array_push(&cmd_args, "--all");
 212         argv_array_push(&cmd_args, "--reflog");
 213         if (window)
 214                 argv_array_pushf(&cmd_args, "--window=%u", window);
 215         if (window_memory)
 216                 argv_array_pushf(&cmd_args, "--window-memory=%u", window_memory);
 217         if (depth)
 218                 argv_array_pushf(&cmd_args, "--depth=%u", depth);
 219         if (max_pack_size)
 220                 argv_array_pushf(&cmd_args, "--max_pack_size=%u", 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         memset(&cmd, 0, sizeof(cmd));
 255         cmd.argv = cmd_args.argv;
 256         cmd.git_cmd = 1;
 257         cmd.out = -1;
 258         cmd.no_stdin = 1;
 259
 260         ret = start_command(&cmd);
 261         if (ret)
 262                 return ret;
 263
 264         nr_packs = 0;
 265         out = xfdopen(cmd.out, "r");
 266         while (strbuf_getline(&line, out, '\n') != EOF) {
 267                 if (line.len != 40)
 268                         die("repack: Expecting 40 character sha1 lines only from pack-objects.");
 269                 string_list_append(&names, line.buf);
 270                 nr_packs++;
 271         }
 272         fclose(out);
 273         ret = finish_command(&cmd);
 274         if (ret)
 275                 return ret;
 276         argv_array_clear(&cmd_args);
 277
 278         if (!nr_packs && !quiet)
 279                 printf("Nothing new to pack.\n");
 280
 281         /*
 282          * Ok we have prepared all new packfiles.
 283          * First see if there are packs of the same name and if so
 284          * if we can move them out of the way (this can happen if we
 285          * repacked immediately after packing fully.
 286          */
 287         failed = 0;
 288         for_each_string_list_item(item, &names) {
 289                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 290                         char *fname, *fname_old;
 291                         fname = mkpathdup("%s/%s%s", packdir,
 292                                                 item->string, exts[ext].name);
 293                         if (!file_exists(fname)) {
 294                                 free(fname);
 295                                 continue;
 296                         }
 297
 298                         fname_old = mkpath("%s/old-%s%s", packdir,
 299                                                 item->string, exts[ext].name);
 300                         if (file_exists(fname_old))
 301                                 if (unlink(fname_old))
 302                                         failed = 1;
 303
 304                         if (!failed && rename(fname, fname_old)) {
 305                                 free(fname);
 306                                 failed = 1;
 307                                 break;
 308                         } else {
 309                                 string_list_append(&rollback, fname);
 310                         }
 311                 }
 312                 if (failed)
 313                         break;
 314         }
 315         if (failed) {
 316                 struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 317                 for_each_string_list_item(item, &rollback) {
 318                         char *fname, *fname_old;
 319                         fname = mkpathdup("%s/%s", packdir, item->string);
 320                         fname_old = mkpath("%s/old-%s", packdir, item->string);
 321                         if (rename(fname_old, fname))
 322                                 string_list_append(&rollback_failure, fname);
 323                         free(fname);
 324                 }
 325
 326                 if (rollback_failure.nr) {
 327                         int i;
 328                         fprintf(stderr,
 329                                 "WARNING: Some packs in use have been renamed by\n"
 330                                 "WARNING: prefixing old- to their name, in order to\n"
 331                                 "WARNING: replace them with the new version of the\n"
 332                                 "WARNING: file.  But the operation failed, and the\n"
 333                                 "WARNING: attempt to rename them back to their\n"
 334                                 "WARNING: original names also failed.\n"
 335                                 "WARNING: Please rename them in %s manually:\n", packdir);
 336                         for (i = 0; i < rollback_failure.nr; i++)
 337                                 fprintf(stderr, "WARNING:   old-%s -> %s\n",
 338                                         rollback_failure.items[i].string,
 339                                         rollback_failure.items[i].string);
 340                 }
 341                 exit(1);
 342         }
 343
 344         /* Now the ones with the same name are out of the way... */
 345         for_each_string_list_item(item, &names) {
 346                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 347                         char *fname, *fname_old;
 348                         struct stat statbuffer;
 349                         int exists = 0;
 350                         fname = mkpathdup("%s/pack-%s%s",
 351                                         packdir, item->string, exts[ext].name);
 352                         fname_old = mkpathdup("%s-%s%s",
 353                                         packtmp, item->string, exts[ext].name);
 354                         if (!stat(fname_old, &statbuffer)) {
 355                                 statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 356                                 chmod(fname_old, statbuffer.st_mode);
 357                                 exists = 1;
 358                         }
 359                         if (exists || !exts[ext].optional) {
 360                                 if (rename(fname_old, fname))
 361                                         die_errno(_("renaming '%s' failed"), fname_old);
 362                         }
 363                         free(fname);
 364                         free(fname_old);
 365                 }
 366         }
 367
 368         /* Remove the "old-" files */
 369         for_each_string_list_item(item, &names) {
 370                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 371                         char *fname;
 372                         fname = mkpath("%s/old-pack-%s%s",
 373                                         packdir,
 374                                         item->string,
 375                                         exts[ext].name);
 376                         if (remove_path(fname))
 377                                 warning(_("removing '%s' failed"), fname);
 378                 }
 379         }
 380
 381         /* End of pack replacement. */
 382
 383         if (delete_redundant) {
 384                 sort_string_list(&names);
 385                 for_each_string_list_item(item, &existing_packs) {
 386                         char *sha1;
 387                         size_t len = strlen(item->string);
 388                         if (len < 40)
 389                                 continue;
 390                         sha1 = item->string + len - 40;
 391                         if (!string_list_has_string(&names, sha1))
 392                                 remove_redundant_pack(packdir, item->string);
 393                 }
 394                 argv_array_push(&cmd_args, "prune-packed");
 395                 if (quiet)
 396                         argv_array_push(&cmd_args, "--quiet");
 397
 398                 memset(&cmd, 0, sizeof(cmd));
 399                 cmd.argv = cmd_args.argv;
 400                 cmd.git_cmd = 1;
 401                 run_command(&cmd);
 402                 argv_array_clear(&cmd_args);
 403         }
 404
 405         if (!no_update_server_info) {
 406                 argv_array_push(&cmd_args, "update-server-info");
 407                 memset(&cmd, 0, sizeof(cmd));
 408                 cmd.argv = cmd_args.argv;
 409                 cmd.git_cmd = 1;
 410                 run_command(&cmd);
 411                 argv_array_clear(&cmd_args);
 412         }
 413         remove_temporary_files();
 414         string_list_clear(&names, 0);
 415         string_list_clear(&rollback, 0);
 416         string_list_clear(&existing_packs, 0);
 417         strbuf_release(&line);
 418
 419         return 0;
 420 }