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         int keep_unreachable = 0;
 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_BOOL('k', "keep-unreachable", &keep_unreachable,
 180                                 N_("with -a, repack unreachable objects")),
 181                 OPT_STRING(0, "window", &window, N_("n"),
 182                                 N_("size of the window used for delta compression")),
 183                 OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
 184                                 N_("same as the above, but limit memory size instead of entries count")),
 185                 OPT_STRING(0, "depth", &depth, N_("n"),
 186                                 N_("limits the maximum delta depth")),
 187                 OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
 188                                 N_("maximum size of each packfile")),
 189                 OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
 190                                 N_("repack objects in packs marked with .keep")),
 191                 OPT_END()
 192         };
 193
 194         git_config(repack_config, NULL);
 195
 196         argc = parse_options(argc, argv, prefix, builtin_repack_options,
 197                                 git_repack_usage, 0);
 198
 199         if (delete_redundant && repository_format_precious_objects)
 200                 die(_("cannot delete packs in a precious-objects repo"));
 201
 202         if (keep_unreachable &&
 203             (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
 204                 die(_("--keep-unreachable and -A are incompatible"));
 205
 206         if (pack_kept_objects < 0)
 207                 pack_kept_objects = write_bitmaps;
 208
 209         packdir = mkpathdup("%s/pack", get_object_directory());
 210         packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
 211
 212         sigchain_push_common(remove_pack_on_signal);
 213
 214         argv_array_push(&cmd.args, "pack-objects");
 215         argv_array_push(&cmd.args, "--keep-true-parents");
 216         if (!pack_kept_objects)
 217                 argv_array_push(&cmd.args, "--honor-pack-keep");
 218         argv_array_push(&cmd.args, "--non-empty");
 219         argv_array_push(&cmd.args, "--all");
 220         argv_array_push(&cmd.args, "--reflog");
 221         argv_array_push(&cmd.args, "--indexed-objects");
 222         if (window)
 223                 argv_array_pushf(&cmd.args, "--window=%s", window);
 224         if (window_memory)
 225                 argv_array_pushf(&cmd.args, "--window-memory=%s", window_memory);
 226         if (depth)
 227                 argv_array_pushf(&cmd.args, "--depth=%s", depth);
 228         if (max_pack_size)
 229                 argv_array_pushf(&cmd.args, "--max-pack-size=%s", max_pack_size);
 230         if (no_reuse_delta)
 231                 argv_array_pushf(&cmd.args, "--no-reuse-delta");
 232         if (no_reuse_object)
 233                 argv_array_pushf(&cmd.args, "--no-reuse-object");
 234         if (write_bitmaps)
 235                 argv_array_push(&cmd.args, "--write-bitmap-index");
 236
 237         if (pack_everything & ALL_INTO_ONE) {
 238                 get_non_kept_pack_filenames(&existing_packs);
 239
 240                 if (existing_packs.nr && delete_redundant) {
 241                         if (unpack_unreachable) {
 242                                 argv_array_pushf(&cmd.args,
 243                                                 "--unpack-unreachable=%s",
 244                                                 unpack_unreachable);
 245                                 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 246                         } else if (pack_everything & LOOSEN_UNREACHABLE) {
 247                                 argv_array_push(&cmd.args,
 248                                                 "--unpack-unreachable");
 249                         } else if (keep_unreachable) {
 250                                 argv_array_push(&cmd.args, "--keep-unreachable");
 251                                 argv_array_push(&cmd.args, "--pack-loose-unreachable");
 252                         } else {
 253                                 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 254                         }
 255                 }
 256         } else {
 257                 argv_array_push(&cmd.args, "--unpacked");
 258                 argv_array_push(&cmd.args, "--incremental");
 259         }
 260
 261         if (local)
 262                 argv_array_push(&cmd.args,  "--local");
 263         if (quiet)
 264                 argv_array_push(&cmd.args,  "--quiet");
 265         if (delta_base_offset)
 266                 argv_array_push(&cmd.args,  "--delta-base-offset");
 267
 268         argv_array_push(&cmd.args, packtmp);
 269
 270         cmd.git_cmd = 1;
 271         cmd.out = -1;
 272         cmd.no_stdin = 1;
 273
 274         ret = start_command(&cmd);
 275         if (ret)
 276                 return ret;
 277
 278         out = xfdopen(cmd.out, "r");
 279         while (strbuf_getline_lf(&line, out) != EOF) {
 280                 if (line.len != 40)
 281                         die("repack: Expecting 40 character sha1 lines only from pack-objects.");
 282                 string_list_append(&names, line.buf);
 283         }
 284         fclose(out);
 285         ret = finish_command(&cmd);
 286         if (ret)
 287                 return ret;
 288
 289         if (!names.nr && !quiet)
 290                 printf("Nothing new to pack.\n");
 291
 292         /*
 293          * Ok we have prepared all new packfiles.
 294          * First see if there are packs of the same name and if so
 295          * if we can move them out of the way (this can happen if we
 296          * repacked immediately after packing fully.
 297          */
 298         failed = 0;
 299         for_each_string_list_item(item, &names) {
 300                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 301                         char *fname, *fname_old;
 302                         fname = mkpathdup("%s/pack-%s%s", packdir,
 303                                                 item->string, exts[ext].name);
 304                         if (!file_exists(fname)) {
 305                                 free(fname);
 306                                 continue;
 307                         }
 308
 309                         fname_old = mkpathdup("%s/old-%s%s", packdir,
 310                                                 item->string, exts[ext].name);
 311                         if (file_exists(fname_old))
 312                                 if (unlink(fname_old))
 313                                         failed = 1;
 314
 315                         if (!failed && rename(fname, fname_old)) {
 316                                 free(fname);
 317                                 free(fname_old);
 318                                 failed = 1;
 319                                 break;
 320                         } else {
 321                                 string_list_append(&rollback, fname);
 322                                 free(fname_old);
 323                         }
 324                 }
 325                 if (failed)
 326                         break;
 327         }
 328         if (failed) {
 329                 struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 330                 for_each_string_list_item(item, &rollback) {
 331                         char *fname, *fname_old;
 332                         fname = mkpathdup("%s/%s", packdir, item->string);
 333                         fname_old = mkpathdup("%s/old-%s", packdir, item->string);
 334                         if (rename(fname_old, fname))
 335                                 string_list_append(&rollback_failure, fname);
 336                         free(fname);
 337                         free(fname_old);
 338                 }
 339
 340                 if (rollback_failure.nr) {
 341                         int i;
 342                         fprintf(stderr,
 343                                 "WARNING: Some packs in use have been renamed by\n"
 344                                 "WARNING: prefixing old- to their name, in order to\n"
 345                                 "WARNING: replace them with the new version of the\n"
 346                                 "WARNING: file.  But the operation failed, and the\n"
 347                                 "WARNING: attempt to rename them back to their\n"
 348                                 "WARNING: original names also failed.\n"
 349                                 "WARNING: Please rename them in %s manually:\n", packdir);
 350                         for (i = 0; i < rollback_failure.nr; i++)
 351                                 fprintf(stderr, "WARNING:   old-%s -> %s\n",
 352                                         rollback_failure.items[i].string,
 353                                         rollback_failure.items[i].string);
 354                 }
 355                 exit(1);
 356         }
 357
 358         /* Now the ones with the same name are out of the way... */
 359         for_each_string_list_item(item, &names) {
 360                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 361                         char *fname, *fname_old;
 362                         struct stat statbuffer;
 363                         int exists = 0;
 364                         fname = mkpathdup("%s/pack-%s%s",
 365                                         packdir, item->string, exts[ext].name);
 366                         fname_old = mkpathdup("%s-%s%s",
 367                                         packtmp, item->string, exts[ext].name);
 368                         if (!stat(fname_old, &statbuffer)) {
 369                                 statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 370                                 chmod(fname_old, statbuffer.st_mode);
 371                                 exists = 1;
 372                         }
 373                         if (exists || !exts[ext].optional) {
 374                                 if (rename(fname_old, fname))
 375                                         die_errno(_("renaming '%s' failed"), fname_old);
 376                         }
 377                         free(fname);
 378                         free(fname_old);
 379                 }
 380         }
 381
 382         /* Remove the "old-" files */
 383         for_each_string_list_item(item, &names) {
 384                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 385                         char *fname;
 386                         fname = mkpathdup("%s/old-%s%s",
 387                                           packdir,
 388                                           item->string,
 389                                           exts[ext].name);
 390                         if (remove_path(fname))
 391                                 warning(_("failed to remove '%s'"), fname);
 392                         free(fname);
 393                 }
 394         }
 395
 396         /* End of pack replacement. */
 397
 398         if (delete_redundant) {
 399                 int opts = 0;
 400                 string_list_sort(&names);
 401                 for_each_string_list_item(item, &existing_packs) {
 402                         char *sha1;
 403                         size_t len = strlen(item->string);
 404                         if (len < 40)
 405                                 continue;
 406                         sha1 = item->string + len - 40;
 407                         if (!string_list_has_string(&names, sha1))
 408                                 remove_redundant_pack(packdir, item->string);
 409                 }
 410                 if (!quiet && isatty(2))
 411                         opts |= PRUNE_PACKED_VERBOSE;
 412                 prune_packed_objects(opts);
 413         }
 414
 415         if (!no_update_server_info)
 416                 update_server_info(0);
 417         remove_temporary_files();
 418         string_list_clear(&names, 0);
 419         string_list_clear(&rollback, 0);
 420         string_list_clear(&existing_packs, 0);
 421         strbuf_release(&line);
 422
 423         return 0;
 424 }