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 (suffixcmp(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 nr_packs, 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         nr_packs = 0;
 237         out = xfdopen(cmd.out, "r");
 238         while (strbuf_getline(&line, out, '\n') != EOF) {
 239                 if (line.len != 40)
 240                         die("repack: Expecting 40 character sha1 lines only from pack-objects.");
 241                 string_list_append(&names, line.buf);
 242                 nr_packs++;
 243         }
 244         fclose(out);
 245         ret = finish_command(&cmd);
 246         if (ret)
 247                 return ret;
 248         argv_array_clear(&cmd_args);
 249
 250         if (!nr_packs && !quiet)
 251                 printf("Nothing new to pack.\n");
 252
 253         /*
 254          * Ok we have prepared all new packfiles.
 255          * First see if there are packs of the same name and if so
 256          * if we can move them out of the way (this can happen if we
 257          * repacked immediately after packing fully.
 258          */
 259         failed = 0;
 260         for_each_string_list_item(item, &names) {
 261                 for (ext = 0; ext < 2; ext++) {
 262                         char *fname, *fname_old;
 263                         fname = mkpathdup("%s/%s%s", packdir,
 264                                                 item->string, exts[ext]);
 265                         if (!file_exists(fname)) {
 266                                 free(fname);
 267                                 continue;
 268                         }
 269
 270                         fname_old = mkpath("%s/old-%s%s", packdir,
 271                                                 item->string, exts[ext]);
 272                         if (file_exists(fname_old))
 273                                 if (unlink(fname_old))
 274                                         failed = 1;
 275
 276                         if (!failed && rename(fname, fname_old)) {
 277                                 free(fname);
 278                                 failed = 1;
 279                                 break;
 280                         } else {
 281                                 string_list_append(&rollback, fname);
 282                         }
 283                 }
 284                 if (failed)
 285                         break;
 286         }
 287         if (failed) {
 288                 struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 289                 for_each_string_list_item(item, &rollback) {
 290                         char *fname, *fname_old;
 291                         fname = mkpathdup("%s/%s", packdir, item->string);
 292                         fname_old = mkpath("%s/old-%s", packdir, item->string);
 293                         if (rename(fname_old, fname))
 294                                 string_list_append(&rollback_failure, fname);
 295                         free(fname);
 296                 }
 297
 298                 if (rollback_failure.nr) {
 299                         int i;
 300                         fprintf(stderr,
 301                                 "WARNING: Some packs in use have been renamed by\n"
 302                                 "WARNING: prefixing old- to their name, in order to\n"
 303                                 "WARNING: replace them with the new version of the\n"
 304                                 "WARNING: file.  But the operation failed, and the\n"
 305                                 "WARNING: attempt to rename them back to their\n"
 306                                 "WARNING: original names also failed.\n"
 307                                 "WARNING: Please rename them in %s manually:\n", packdir);
 308                         for (i = 0; i < rollback_failure.nr; i++)
 309                                 fprintf(stderr, "WARNING:   old-%s -> %s\n",
 310                                         rollback_failure.items[i].string,
 311                                         rollback_failure.items[i].string);
 312                 }
 313                 exit(1);
 314         }
 315
 316         /* Now the ones with the same name are out of the way... */
 317         for_each_string_list_item(item, &names) {
 318                 for (ext = 0; ext < 2; ext++) {
 319                         char *fname, *fname_old;
 320                         struct stat statbuffer;
 321                         fname = mkpathdup("%s/pack-%s%s",
 322                                         packdir, item->string, exts[ext]);
 323                         fname_old = mkpathdup("%s-%s%s",
 324                                         packtmp, item->string, exts[ext]);
 325                         if (!stat(fname_old, &statbuffer)) {
 326                                 statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 327                                 chmod(fname_old, statbuffer.st_mode);
 328                         }
 329                         if (rename(fname_old, fname))
 330                                 die_errno(_("renaming '%s' failed"), fname_old);
 331                         free(fname);
 332                         free(fname_old);
 333                 }
 334         }
 335
 336         /* Remove the "old-" files */
 337         for_each_string_list_item(item, &names) {
 338                 for (ext = 0; ext < 2; ext++) {
 339                         char *fname;
 340                         fname = mkpath("%s/old-pack-%s%s",
 341                                         packdir,
 342                                         item->string,
 343                                         exts[ext]);
 344                         if (remove_path(fname))
 345                                 warning(_("removing '%s' failed"), fname);
 346                 }
 347         }
 348
 349         /* End of pack replacement. */
 350
 351         if (delete_redundant) {
 352                 sort_string_list(&names);
 353                 for_each_string_list_item(item, &existing_packs) {
 354                         char *sha1;
 355                         size_t len = strlen(item->string);
 356                         if (len < 40)
 357                                 continue;
 358                         sha1 = item->string + len - 40;
 359                         if (!string_list_has_string(&names, sha1))
 360                                 remove_redundant_pack(packdir, item->string);
 361                 }
 362                 argv_array_push(&cmd_args, "prune-packed");
 363                 if (quiet)
 364                         argv_array_push(&cmd_args, "--quiet");
 365
 366                 memset(&cmd, 0, sizeof(cmd));
 367                 cmd.argv = cmd_args.argv;
 368                 cmd.git_cmd = 1;
 369                 run_command(&cmd);
 370                 argv_array_clear(&cmd_args);
 371         }
 372
 373         if (!no_update_server_info) {
 374                 argv_array_push(&cmd_args, "update-server-info");
 375                 memset(&cmd, 0, sizeof(cmd));
 376                 cmd.argv = cmd_args.argv;
 377                 cmd.git_cmd = 1;
 378                 run_command(&cmd);
 379                 argv_array_clear(&cmd_args);
 380         }
 381         remove_temporary_files();
 382         string_list_clear(&names, 0);
 383         string_list_clear(&rollback, 0);
 384         string_list_clear(&existing_packs, 0);
 385         strbuf_release(&line);
 386
 387         return 0;
 388 }