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         const char *window = NULL, *window_memory = NULL;
 150         const char *depth = NULL;
 151         const char *max_pack_size = NULL;
 152         int no_reuse_delta = 0, no_reuse_object = 0;
 153         int no_update_server_info = 0;
 154         int quiet = 0;
 155         int local = 0;
 156
 157         struct option builtin_repack_options[] = {
 158                 OPT_BIT('a', NULL, &pack_everything,
 159                                 N_("pack everything in a single pack"), ALL_INTO_ONE),
 160                 OPT_BIT('A', NULL, &pack_everything,
 161                                 N_("same as -a, and turn unreachable objects loose"),
 162                                    LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 163                 OPT_BOOL('d', NULL, &delete_redundant,
 164                                 N_("remove redundant packs, and run git-prune-packed")),
 165                 OPT_BOOL('f', NULL, &no_reuse_delta,
 166                                 N_("pass --no-reuse-delta to git-pack-objects")),
 167                 OPT_BOOL('F', NULL, &no_reuse_object,
 168                                 N_("pass --no-reuse-object to git-pack-objects")),
 169                 OPT_BOOL('n', NULL, &no_update_server_info,
 170                                 N_("do not run git-update-server-info")),
 171                 OPT__QUIET(&quiet, N_("be quiet")),
 172                 OPT_BOOL('l', "local", &local,
 173                                 N_("pass --local to git-pack-objects")),
 174                 OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
 175                                 N_("write bitmap index")),
 176                 OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 177                                 N_("with -A, do not loosen objects older than this")),
 178                 OPT_STRING(0, "window", &window, N_("n"),
 179                                 N_("size of the window used for delta compression")),
 180                 OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
 181                                 N_("same as the above, but limit memory size instead of entries count")),
 182                 OPT_STRING(0, "depth", &depth, N_("n"),
 183                                 N_("limits the maximum delta depth")),
 184                 OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
 185                                 N_("maximum size of each packfile")),
 186                 OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
 187                                 N_("repack objects in packs marked with .keep")),
 188                 OPT_END()
 189         };
 190
 191         git_config(repack_config, NULL);
 192
 193         argc = parse_options(argc, argv, prefix, builtin_repack_options,
 194                                 git_repack_usage, 0);
 195
 196         if (pack_kept_objects < 0)
 197                 pack_kept_objects = write_bitmaps;
 198
 199         packdir = mkpathdup("%s/pack", get_object_directory());
 200         packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
 201
 202         sigchain_push_common(remove_pack_on_signal);
 203
 204         argv_array_push(&cmd.args, "pack-objects");
 205         argv_array_push(&cmd.args, "--keep-true-parents");
 206         if (!pack_kept_objects)
 207                 argv_array_push(&cmd.args, "--honor-pack-keep");
 208         argv_array_push(&cmd.args, "--non-empty");
 209         argv_array_push(&cmd.args, "--all");
 210         argv_array_push(&cmd.args, "--reflog");
 211         argv_array_push(&cmd.args, "--indexed-objects");
 212         if (window)
 213                 argv_array_pushf(&cmd.args, "--window=%s", window);
 214         if (window_memory)
 215                 argv_array_pushf(&cmd.args, "--window-memory=%s", window_memory);
 216         if (depth)
 217                 argv_array_pushf(&cmd.args, "--depth=%s", depth);
 218         if (max_pack_size)
 219                 argv_array_pushf(&cmd.args, "--max-pack-size=%s", max_pack_size);
 220         if (no_reuse_delta)
 221                 argv_array_pushf(&cmd.args, "--no-reuse-delta");
 222         if (no_reuse_object)
 223                 argv_array_pushf(&cmd.args, "--no-reuse-object");
 224         if (write_bitmaps)
 225                 argv_array_push(&cmd.args, "--write-bitmap-index");
 226
 227         if (pack_everything & ALL_INTO_ONE) {
 228                 get_non_kept_pack_filenames(&existing_packs);
 229
 230                 if (existing_packs.nr && delete_redundant) {
 231                         if (unpack_unreachable) {
 232                                 argv_array_pushf(&cmd.args,
 233                                                 "--unpack-unreachable=%s",
 234                                                 unpack_unreachable);
 235                                 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 236                         } else if (pack_everything & LOOSEN_UNREACHABLE) {
 237                                 argv_array_push(&cmd.args,
 238                                                 "--unpack-unreachable");
 239                         } else {
 240                                 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 241                         }
 242                 }
 243         } else {
 244                 argv_array_push(&cmd.args, "--unpacked");
 245                 argv_array_push(&cmd.args, "--incremental");
 246         }
 247
 248         if (local)
 249                 argv_array_push(&cmd.args,  "--local");
 250         if (quiet)
 251                 argv_array_push(&cmd.args,  "--quiet");
 252         if (delta_base_offset)
 253                 argv_array_push(&cmd.args,  "--delta-base-offset");
 254
 255         argv_array_push(&cmd.args, packtmp);
 256
 257         cmd.git_cmd = 1;
 258         cmd.out = -1;
 259         cmd.no_stdin = 1;
 260
 261         ret = start_command(&cmd);
 262         if (ret)
 263                 return ret;
 264
 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         }
 271         fclose(out);
 272         ret = finish_command(&cmd);
 273         if (ret)
 274                 return ret;
 275
 276         if (!names.nr && !quiet)
 277                 printf("Nothing new to pack.\n");
 278
 279         /*
 280          * Ok we have prepared all new packfiles.
 281          * First see if there are packs of the same name and if so
 282          * if we can move them out of the way (this can happen if we
 283          * repacked immediately after packing fully.
 284          */
 285         failed = 0;
 286         for_each_string_list_item(item, &names) {
 287                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 288                         char *fname, *fname_old;
 289                         fname = mkpathdup("%s/pack-%s%s", packdir,
 290                                                 item->string, exts[ext].name);
 291                         if (!file_exists(fname)) {
 292                                 free(fname);
 293                                 continue;
 294                         }
 295
 296                         fname_old = mkpath("%s/old-%s%s", packdir,
 297                                                 item->string, exts[ext].name);
 298                         if (file_exists(fname_old))
 299                                 if (unlink(fname_old))
 300                                         failed = 1;
 301
 302                         if (!failed && rename(fname, fname_old)) {
 303                                 free(fname);
 304                                 failed = 1;
 305                                 break;
 306                         } else {
 307                                 string_list_append(&rollback, fname);
 308                         }
 309                 }
 310                 if (failed)
 311                         break;
 312         }
 313         if (failed) {
 314                 struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 315                 for_each_string_list_item(item, &rollback) {
 316                         char *fname, *fname_old;
 317                         fname = mkpathdup("%s/%s", packdir, item->string);
 318                         fname_old = mkpath("%s/old-%s", packdir, item->string);
 319                         if (rename(fname_old, fname))
 320                                 string_list_append(&rollback_failure, fname);
 321                         free(fname);
 322                 }
 323
 324                 if (rollback_failure.nr) {
 325                         int i;
 326                         fprintf(stderr,
 327                                 "WARNING: Some packs in use have been renamed by\n"
 328                                 "WARNING: prefixing old- to their name, in order to\n"
 329                                 "WARNING: replace them with the new version of the\n"
 330                                 "WARNING: file.  But the operation failed, and the\n"
 331                                 "WARNING: attempt to rename them back to their\n"
 332                                 "WARNING: original names also failed.\n"
 333                                 "WARNING: Please rename them in %s manually:\n", packdir);
 334                         for (i = 0; i < rollback_failure.nr; i++)
 335                                 fprintf(stderr, "WARNING:   old-%s -> %s\n",
 336                                         rollback_failure.items[i].string,
 337                                         rollback_failure.items[i].string);
 338                 }
 339                 exit(1);
 340         }
 341
 342         /* Now the ones with the same name are out of the way... */
 343         for_each_string_list_item(item, &names) {
 344                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 345                         char *fname, *fname_old;
 346                         struct stat statbuffer;
 347                         int exists = 0;
 348                         fname = mkpathdup("%s/pack-%s%s",
 349                                         packdir, item->string, exts[ext].name);
 350                         fname_old = mkpathdup("%s-%s%s",
 351                                         packtmp, item->string, exts[ext].name);
 352                         if (!stat(fname_old, &statbuffer)) {
 353                                 statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 354                                 chmod(fname_old, statbuffer.st_mode);
 355                                 exists = 1;
 356                         }
 357                         if (exists || !exts[ext].optional) {
 358                                 if (rename(fname_old, fname))
 359                                         die_errno(_("renaming '%s' failed"), fname_old);
 360                         }
 361                         free(fname);
 362                         free(fname_old);
 363                 }
 364         }
 365
 366         /* Remove the "old-" files */
 367         for_each_string_list_item(item, &names) {
 368                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 369                         char *fname;
 370                         fname = mkpath("%s/old-%s%s",
 371                                         packdir,
 372                                         item->string,
 373                                         exts[ext].name);
 374                         if (remove_path(fname))
 375                                 warning(_("removing '%s' failed"), fname);
 376                 }
 377         }
 378
 379         /* End of pack replacement. */
 380
 381         if (delete_redundant) {
 382                 int opts = 0;
 383                 string_list_sort(&names);
 384                 for_each_string_list_item(item, &existing_packs) {
 385                         char *sha1;
 386                         size_t len = strlen(item->string);
 387                         if (len < 40)
 388                                 continue;
 389                         sha1 = item->string + len - 40;
 390                         if (!string_list_has_string(&names, sha1))
 391                                 remove_redundant_pack(packdir, item->string);
 392                 }
 393                 if (!quiet && isatty(2))
 394                         opts |= PRUNE_PACKED_VERBOSE;
 395                 prune_packed_objects(opts);
 396         }
 397
 398         if (!no_update_server_info)
 399                 update_server_info(0);
 400         remove_temporary_files();
 401         string_list_clear(&names, 0);
 402         string_list_clear(&rollback, 0);
 403         string_list_clear(&existing_packs, 0);
 404         strbuf_release(&line);
 405
 406         return 0;
 407 }