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 char *packdir, *packtmp;
  14
  15 static const char *const git_repack_usage[] = {
  16         N_("git repack [options]"),
  17         NULL
  18 };
  19
  20 static int repack_config(const char *var, const char *value, void *cb)
  21 {
  22         if (!strcmp(var, "repack.usedeltabaseoffset")) {
  23                 delta_base_offset = git_config_bool(var, value);
  24                 return 0;
  25         }
  26         if (!strcmp(var, "repack.packkeptobjects")) {
  27                 pack_kept_objects = git_config_bool(var, value);
  28                 return 0;
  29         }
  30         return git_default_config(var, value, cb);
  31 }
  32
  33 /*
  34  * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
  35  */
  36 static void remove_temporary_files(void)
  37 {
  38         struct strbuf buf = STRBUF_INIT;
  39         size_t dirlen, prefixlen;
  40         DIR *dir;
  41         struct dirent *e;
  42
  43         dir = opendir(packdir);
  44         if (!dir)
  45                 return;
  46
  47         /* Point at the slash at the end of ".../objects/pack/" */
  48         dirlen = strlen(packdir) + 1;
  49         strbuf_addstr(&buf, packtmp);
  50         /* Hold the length of  ".tmp-%d-pack-" */
  51         prefixlen = buf.len - dirlen;
  52
  53         while ((e = readdir(dir))) {
  54                 if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
  55                         continue;
  56                 strbuf_setlen(&buf, dirlen);
  57                 strbuf_addstr(&buf, e->d_name);
  58                 unlink(buf.buf);
  59         }
  60         closedir(dir);
  61         strbuf_release(&buf);
  62 }
  63
  64 static void remove_pack_on_signal(int signo)
  65 {
  66         remove_temporary_files();
  67         sigchain_pop(signo);
  68         raise(signo);
  69 }
  70
  71 /*
  72  * Adds all packs hex strings to the fname list, which do not
  73  * have a corresponding .keep file.
  74  */
  75 static void get_non_kept_pack_filenames(struct string_list *fname_list)
  76 {
  77         DIR *dir;
  78         struct dirent *e;
  79         char *fname;
  80
  81         if (!(dir = opendir(packdir)))
  82                 return;
  83
  84         while ((e = readdir(dir)) != NULL) {
  85                 size_t len;
  86                 if (!strip_suffix(e->d_name, ".pack", &len))
  87                         continue;
  88
  89                 fname = xmemdupz(e->d_name, len);
  90
  91                 if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
  92                         string_list_append_nodup(fname_list, fname);
  93                 else
  94                         free(fname);
  95         }
  96         closedir(dir);
  97 }
  98
  99 static void remove_redundant_pack(const char *dir_name, const char *base_name)
 100 {
 101         const char *exts[] = {".pack", ".idx", ".keep", ".bitmap"};
 102         int i;
 103         struct strbuf buf = STRBUF_INIT;
 104         size_t plen;
 105
 106         strbuf_addf(&buf, "%s/%s", dir_name, base_name);
 107         plen = buf.len;
 108
 109         for (i = 0; i < ARRAY_SIZE(exts); i++) {
 110                 strbuf_setlen(&buf, plen);
 111                 strbuf_addstr(&buf, exts[i]);
 112                 unlink(buf.buf);
 113         }
 114         strbuf_release(&buf);
 115 }
 116
 117 #define ALL_INTO_ONE 1
 118 #define LOOSEN_UNREACHABLE 2
 119
 120 int cmd_repack(int argc, const char **argv, const char *prefix)
 121 {
 122         struct {
 123                 const char *name;
 124                 unsigned optional:1;
 125         } exts[] = {
 126                 {".pack"},
 127                 {".idx"},
 128                 {".bitmap", 1},
 129         };
 130         struct child_process cmd;
 131         struct string_list_item *item;
 132         struct argv_array cmd_args = ARGV_ARRAY_INIT;
 133         struct string_list names = STRING_LIST_INIT_DUP;
 134         struct string_list rollback = STRING_LIST_INIT_NODUP;
 135         struct string_list existing_packs = STRING_LIST_INIT_DUP;
 136         struct strbuf line = STRBUF_INIT;
 137         int ext, ret, failed;
 138         FILE *out;
 139
 140         /* variables to be filled by option parsing */
 141         int pack_everything = 0;
 142         int delete_redundant = 0;
 143         const char *unpack_unreachable = NULL;
 144         const char *window = NULL, *window_memory = NULL;
 145         const char *depth = NULL;
 146         const char *max_pack_size = NULL;
 147         int no_reuse_delta = 0, no_reuse_object = 0;
 148         int no_update_server_info = 0;
 149         int quiet = 0;
 150         int local = 0;
 151         int write_bitmap = -1;
 152
 153         struct option builtin_repack_options[] = {
 154                 OPT_BIT('a', NULL, &pack_everything,
 155                                 N_("pack everything in a single pack"), ALL_INTO_ONE),
 156                 OPT_BIT('A', NULL, &pack_everything,
 157                                 N_("same as -a, and turn unreachable objects loose"),
 158                                    LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 159                 OPT_BOOL('d', NULL, &delete_redundant,
 160                                 N_("remove redundant packs, and run git-prune-packed")),
 161                 OPT_BOOL('f', NULL, &no_reuse_delta,
 162                                 N_("pass --no-reuse-delta to git-pack-objects")),
 163                 OPT_BOOL('F', NULL, &no_reuse_object,
 164                                 N_("pass --no-reuse-object to git-pack-objects")),
 165                 OPT_BOOL('n', NULL, &no_update_server_info,
 166                                 N_("do not run git-update-server-info")),
 167                 OPT__QUIET(&quiet, N_("be quiet")),
 168                 OPT_BOOL('l', "local", &local,
 169                                 N_("pass --local to git-pack-objects")),
 170                 OPT_BOOL('b', "write-bitmap-index", &write_bitmap,
 171                                 N_("write bitmap index")),
 172                 OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 173                                 N_("with -A, do not loosen objects older than this")),
 174                 OPT_STRING(0, "window", &window, N_("n"),
 175                                 N_("size of the window used for delta compression")),
 176                 OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
 177                                 N_("same as the above, but limit memory size instead of entries count")),
 178                 OPT_STRING(0, "depth", &depth, N_("n"),
 179                                 N_("limits the maximum delta depth")),
 180                 OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
 181                                 N_("maximum size of each packfile")),
 182                 OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
 183                                 N_("repack objects in packs marked with .keep")),
 184                 OPT_END()
 185         };
 186
 187         git_config(repack_config, NULL);
 188
 189         argc = parse_options(argc, argv, prefix, builtin_repack_options,
 190                                 git_repack_usage, 0);
 191
 192         if (pack_kept_objects < 0)
 193                 pack_kept_objects = write_bitmap;
 194
 195         packdir = mkpathdup("%s/pack", get_object_directory());
 196         packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
 197
 198         sigchain_push_common(remove_pack_on_signal);
 199
 200         argv_array_push(&cmd_args, "pack-objects");
 201         argv_array_push(&cmd_args, "--keep-true-parents");
 202         if (!pack_kept_objects)
 203                 argv_array_push(&cmd_args, "--honor-pack-keep");
 204         argv_array_push(&cmd_args, "--non-empty");
 205         argv_array_push(&cmd_args, "--all");
 206         argv_array_push(&cmd_args, "--reflog");
 207         if (window)
 208                 argv_array_pushf(&cmd_args, "--window=%s", window);
 209         if (window_memory)
 210                 argv_array_pushf(&cmd_args, "--window-memory=%s", window_memory);
 211         if (depth)
 212                 argv_array_pushf(&cmd_args, "--depth=%s", depth);
 213         if (max_pack_size)
 214                 argv_array_pushf(&cmd_args, "--max-pack-size=%s", max_pack_size);
 215         if (no_reuse_delta)
 216                 argv_array_pushf(&cmd_args, "--no-reuse-delta");
 217         if (no_reuse_object)
 218                 argv_array_pushf(&cmd_args, "--no-reuse-object");
 219         if (write_bitmap >= 0)
 220                 argv_array_pushf(&cmd_args, "--%swrite-bitmap-index",
 221                                  write_bitmap ? "" : "no-");
 222
 223         if (pack_everything & ALL_INTO_ONE) {
 224                 get_non_kept_pack_filenames(&existing_packs);
 225
 226                 if (existing_packs.nr && delete_redundant) {
 227                         if (unpack_unreachable)
 228                                 argv_array_pushf(&cmd_args,
 229                                                 "--unpack-unreachable=%s",
 230                                                 unpack_unreachable);
 231                         else if (pack_everything & LOOSEN_UNREACHABLE)
 232                                 argv_array_push(&cmd_args,
 233                                                 "--unpack-unreachable");
 234                 }
 235         } else {
 236                 argv_array_push(&cmd_args, "--unpacked");
 237                 argv_array_push(&cmd_args, "--incremental");
 238         }
 239
 240         if (local)
 241                 argv_array_push(&cmd_args,  "--local");
 242         if (quiet)
 243                 argv_array_push(&cmd_args,  "--quiet");
 244         if (delta_base_offset)
 245                 argv_array_push(&cmd_args,  "--delta-base-offset");
 246
 247         argv_array_push(&cmd_args, packtmp);
 248
 249         memset(&cmd, 0, sizeof(cmd));
 250         cmd.argv = cmd_args.argv;
 251         cmd.git_cmd = 1;
 252         cmd.out = -1;
 253         cmd.no_stdin = 1;
 254
 255         ret = start_command(&cmd);
 256         if (ret)
 257                 return ret;
 258
 259         out = xfdopen(cmd.out, "r");
 260         while (strbuf_getline(&line, out, '\n') != EOF) {
 261                 if (line.len != 40)
 262                         die("repack: Expecting 40 character sha1 lines only from pack-objects.");
 263                 string_list_append(&names, line.buf);
 264         }
 265         fclose(out);
 266         ret = finish_command(&cmd);
 267         if (ret)
 268                 return ret;
 269         argv_array_clear(&cmd_args);
 270
 271         if (!names.nr && !quiet)
 272                 printf("Nothing new to pack.\n");
 273
 274         /*
 275          * Ok we have prepared all new packfiles.
 276          * First see if there are packs of the same name and if so
 277          * if we can move them out of the way (this can happen if we
 278          * repacked immediately after packing fully.
 279          */
 280         failed = 0;
 281         for_each_string_list_item(item, &names) {
 282                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 283                         char *fname, *fname_old;
 284                         fname = mkpathdup("%s/pack-%s%s", packdir,
 285                                                 item->string, exts[ext].name);
 286                         if (!file_exists(fname)) {
 287                                 free(fname);
 288                                 continue;
 289                         }
 290
 291                         fname_old = mkpath("%s/old-%s%s", packdir,
 292                                                 item->string, exts[ext].name);
 293                         if (file_exists(fname_old))
 294                                 if (unlink(fname_old))
 295                                         failed = 1;
 296
 297                         if (!failed && rename(fname, fname_old)) {
 298                                 free(fname);
 299                                 failed = 1;
 300                                 break;
 301                         } else {
 302                                 string_list_append(&rollback, fname);
 303                         }
 304                 }
 305                 if (failed)
 306                         break;
 307         }
 308         if (failed) {
 309                 struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 310                 for_each_string_list_item(item, &rollback) {
 311                         char *fname, *fname_old;
 312                         fname = mkpathdup("%s/%s", packdir, item->string);
 313                         fname_old = mkpath("%s/old-%s", packdir, item->string);
 314                         if (rename(fname_old, fname))
 315                                 string_list_append(&rollback_failure, fname);
 316                         free(fname);
 317                 }
 318
 319                 if (rollback_failure.nr) {
 320                         int i;
 321                         fprintf(stderr,
 322                                 "WARNING: Some packs in use have been renamed by\n"
 323                                 "WARNING: prefixing old- to their name, in order to\n"
 324                                 "WARNING: replace them with the new version of the\n"
 325                                 "WARNING: file.  But the operation failed, and the\n"
 326                                 "WARNING: attempt to rename them back to their\n"
 327                                 "WARNING: original names also failed.\n"
 328                                 "WARNING: Please rename them in %s manually:\n", packdir);
 329                         for (i = 0; i < rollback_failure.nr; i++)
 330                                 fprintf(stderr, "WARNING:   old-%s -> %s\n",
 331                                         rollback_failure.items[i].string,
 332                                         rollback_failure.items[i].string);
 333                 }
 334                 exit(1);
 335         }
 336
 337         /* Now the ones with the same name are out of the way... */
 338         for_each_string_list_item(item, &names) {
 339                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 340                         char *fname, *fname_old;
 341                         struct stat statbuffer;
 342                         int exists = 0;
 343                         fname = mkpathdup("%s/pack-%s%s",
 344                                         packdir, item->string, exts[ext].name);
 345                         fname_old = mkpathdup("%s-%s%s",
 346                                         packtmp, item->string, exts[ext].name);
 347                         if (!stat(fname_old, &statbuffer)) {
 348                                 statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 349                                 chmod(fname_old, statbuffer.st_mode);
 350                                 exists = 1;
 351                         }
 352                         if (exists || !exts[ext].optional) {
 353                                 if (rename(fname_old, fname))
 354                                         die_errno(_("renaming '%s' failed"), fname_old);
 355                         }
 356                         free(fname);
 357                         free(fname_old);
 358                 }
 359         }
 360
 361         /* Remove the "old-" files */
 362         for_each_string_list_item(item, &names) {
 363                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 364                         char *fname;
 365                         fname = mkpath("%s/old-%s%s",
 366                                         packdir,
 367                                         item->string,
 368                                         exts[ext].name);
 369                         if (remove_path(fname))
 370                                 warning(_("removing '%s' failed"), fname);
 371                 }
 372         }
 373
 374         /* End of pack replacement. */
 375
 376         if (delete_redundant) {
 377                 sort_string_list(&names);
 378                 for_each_string_list_item(item, &existing_packs) {
 379                         char *sha1;
 380                         size_t len = strlen(item->string);
 381                         if (len < 40)
 382                                 continue;
 383                         sha1 = item->string + len - 40;
 384                         if (!string_list_has_string(&names, sha1))
 385                                 remove_redundant_pack(packdir, item->string);
 386                 }
 387                 argv_array_push(&cmd_args, "prune-packed");
 388                 if (quiet)
 389                         argv_array_push(&cmd_args, "--quiet");
 390
 391                 memset(&cmd, 0, sizeof(cmd));
 392                 cmd.argv = cmd_args.argv;
 393                 cmd.git_cmd = 1;
 394                 run_command(&cmd);
 395                 argv_array_clear(&cmd_args);
 396         }
 397
 398         if (!no_update_server_info) {
 399                 argv_array_push(&cmd_args, "update-server-info");
 400                 memset(&cmd, 0, sizeof(cmd));
 401                 cmd.argv = cmd_args.argv;
 402                 cmd.git_cmd = 1;
 403                 run_command(&cmd);
 404                 argv_array_clear(&cmd_args);
 405         }
 406         remove_temporary_files();
 407         string_list_clear(&names, 0);
 408         string_list_clear(&rollback, 0);
 409         string_list_clear(&existing_packs, 0);
 410         strbuf_release(&line);
 411
 412         return 0;
 413 }