Andrew's git - gitweb.git/blob

   1#include "builtin.h"
   2#include "cache.h"
   3#include "config.h"
   4#include "dir.h"
   5#include "parse-options.h"
   6#include "run-command.h"
   7#include "sigchain.h"
   8#include "strbuf.h"
   9#include "string-list.h"
  10#include "argv-array.h"
  11
  12static int delta_base_offset = 1;
  13static int pack_kept_objects = -1;
  14static int write_bitmaps;
  15static int use_delta_islands;
  16static char *packdir, *packtmp;
  17
  18static const char *const git_repack_usage[] = {
  19        N_("git repack [<options>]"),
  20        NULL
  21};
  22
  23static const char incremental_bitmap_conflict_error[] = N_(
  24"Incremental repacks are incompatible with bitmap indexes.  Use\n"
  25"--no-write-bitmap-index or disable the pack.writebitmaps configuration."
  26);
  27
  28
  29static int repack_config(const char *var, const char *value, void *cb)
  30{
  31        if (!strcmp(var, "repack.usedeltabaseoffset")) {
  32                delta_base_offset = git_config_bool(var, value);
  33                return 0;
  34        }
  35        if (!strcmp(var, "repack.packkeptobjects")) {
  36                pack_kept_objects = git_config_bool(var, value);
  37                return 0;
  38        }
  39        if (!strcmp(var, "repack.writebitmaps") ||
  40            !strcmp(var, "pack.writebitmaps")) {
  41                write_bitmaps = git_config_bool(var, value);
  42                return 0;
  43        }
  44        if (!strcmp(var, "repack.usedeltaislands")) {
  45                use_delta_islands = git_config_bool(var, value);
  46                return 0;
  47        }
  48        return git_default_config(var, value, cb);
  49}
  50
  51/*
  52 * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
  53 */
  54static void remove_temporary_files(void)
  55{
  56        struct strbuf buf = STRBUF_INIT;
  57        size_t dirlen, prefixlen;
  58        DIR *dir;
  59        struct dirent *e;
  60
  61        dir = opendir(packdir);
  62        if (!dir)
  63                return;
  64
  65        /* Point at the slash at the end of ".../objects/pack/" */
  66        dirlen = strlen(packdir) + 1;
  67        strbuf_addstr(&buf, packtmp);
  68        /* Hold the length of  ".tmp-%d-pack-" */
  69        prefixlen = buf.len - dirlen;
  70
  71        while ((e = readdir(dir))) {
  72                if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
  73                        continue;
  74                strbuf_setlen(&buf, dirlen);
  75                strbuf_addstr(&buf, e->d_name);
  76                unlink(buf.buf);
  77        }
  78        closedir(dir);
  79        strbuf_release(&buf);
  80}
  81
  82static void remove_pack_on_signal(int signo)
  83{
  84        remove_temporary_files();
  85        sigchain_pop(signo);
  86        raise(signo);
  87}
  88
  89/*
  90 * Adds all packs hex strings to the fname list, which do not
  91 * have a corresponding .keep or .promisor file. These packs are not to
  92 * be kept if we are going to pack everything into one file.
  93 */
  94static void get_non_kept_pack_filenames(struct string_list *fname_list,
  95                                        const struct string_list *extra_keep)
  96{
  97        DIR *dir;
  98        struct dirent *e;
  99        char *fname;
 100
 101        if (!(dir = opendir(packdir)))
 102                return;
 103
 104        while ((e = readdir(dir)) != NULL) {
 105                size_t len;
 106                int i;
 107
 108                for (i = 0; i < extra_keep->nr; i++)
 109                        if (!fspathcmp(e->d_name, extra_keep->items[i].string))
 110                                break;
 111                if (extra_keep->nr > 0 && i < extra_keep->nr)
 112                        continue;
 113
 114                if (!strip_suffix(e->d_name, ".pack", &len))
 115                        continue;
 116
 117                fname = xmemdupz(e->d_name, len);
 118
 119                if (!file_exists(mkpath("%s/%s.keep", packdir, fname)) &&
 120                    !file_exists(mkpath("%s/%s.promisor", packdir, fname)))
 121                        string_list_append_nodup(fname_list, fname);
 122                else
 123                        free(fname);
 124        }
 125        closedir(dir);
 126}
 127
 128static void remove_redundant_pack(const char *dir_name, const char *base_name)
 129{
 130        const char *exts[] = {".pack", ".idx", ".keep", ".bitmap"};
 131        int i;
 132        struct strbuf buf = STRBUF_INIT;
 133        size_t plen;
 134
 135        strbuf_addf(&buf, "%s/%s", dir_name, base_name);
 136        plen = buf.len;
 137
 138        for (i = 0; i < ARRAY_SIZE(exts); i++) {
 139                strbuf_setlen(&buf, plen);
 140                strbuf_addstr(&buf, exts[i]);
 141                unlink(buf.buf);
 142        }
 143        strbuf_release(&buf);
 144}
 145
 146#define ALL_INTO_ONE 1
 147#define LOOSEN_UNREACHABLE 2
 148
 149int cmd_repack(int argc, const char **argv, const char *prefix)
 150{
 151        struct {
 152                const char *name;
 153                unsigned optional:1;
 154        } exts[] = {
 155                {".pack"},
 156                {".idx"},
 157                {".bitmap", 1},
 158        };
 159        struct child_process cmd = CHILD_PROCESS_INIT;
 160        struct string_list_item *item;
 161        struct string_list names = STRING_LIST_INIT_DUP;
 162        struct string_list rollback = STRING_LIST_INIT_NODUP;
 163        struct string_list existing_packs = STRING_LIST_INIT_DUP;
 164        struct strbuf line = STRBUF_INIT;
 165        int i, ext, ret, failed;
 166        FILE *out;
 167
 168        /* variables to be filled by option parsing */
 169        int pack_everything = 0;
 170        int delete_redundant = 0;
 171        const char *unpack_unreachable = NULL;
 172        int keep_unreachable = 0;
 173        const char *window = NULL, *window_memory = NULL;
 174        const char *depth = NULL;
 175        const char *threads = NULL;
 176        const char *max_pack_size = NULL;
 177        struct string_list keep_pack_list = STRING_LIST_INIT_NODUP;
 178        int no_reuse_delta = 0, no_reuse_object = 0;
 179        int no_update_server_info = 0;
 180        int quiet = 0;
 181        int local = 0;
 182
 183        struct option builtin_repack_options[] = {
 184                OPT_BIT('a', NULL, &pack_everything,
 185                                N_("pack everything in a single pack"), ALL_INTO_ONE),
 186                OPT_BIT('A', NULL, &pack_everything,
 187                                N_("same as -a, and turn unreachable objects loose"),
 188                                   LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 189                OPT_BOOL('d', NULL, &delete_redundant,
 190                                N_("remove redundant packs, and run git-prune-packed")),
 191                OPT_BOOL('f', NULL, &no_reuse_delta,
 192                                N_("pass --no-reuse-delta to git-pack-objects")),
 193                OPT_BOOL('F', NULL, &no_reuse_object,
 194                                N_("pass --no-reuse-object to git-pack-objects")),
 195                OPT_BOOL('n', NULL, &no_update_server_info,
 196                                N_("do not run git-update-server-info")),
 197                OPT__QUIET(&quiet, N_("be quiet")),
 198                OPT_BOOL('l', "local", &local,
 199                                N_("pass --local to git-pack-objects")),
 200                OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
 201                                N_("write bitmap index")),
 202                OPT_BOOL('i', "delta-islands", &use_delta_islands,
 203                                N_("pass --delta-islands to git-pack-objects")),
 204                OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 205                                N_("with -A, do not loosen objects older than this")),
 206                OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
 207                                N_("with -a, repack unreachable objects")),
 208                OPT_STRING(0, "window", &window, N_("n"),
 209                                N_("size of the window used for delta compression")),
 210                OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
 211                                N_("same as the above, but limit memory size instead of entries count")),
 212                OPT_STRING(0, "depth", &depth, N_("n"),
 213                                N_("limits the maximum delta depth")),
 214                OPT_STRING(0, "threads", &threads, N_("n"),
 215                                N_("limits the maximum number of threads")),
 216                OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
 217                                N_("maximum size of each packfile")),
 218                OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
 219                                N_("repack objects in packs marked with .keep")),
 220                OPT_STRING_LIST(0, "keep-pack", &keep_pack_list, N_("name"),
 221                                N_("do not repack this pack")),
 222                OPT_END()
 223        };
 224
 225        git_config(repack_config, NULL);
 226
 227        argc = parse_options(argc, argv, prefix, builtin_repack_options,
 228                                git_repack_usage, 0);
 229
 230        if (delete_redundant && repository_format_precious_objects)
 231                die(_("cannot delete packs in a precious-objects repo"));
 232
 233        if (keep_unreachable &&
 234            (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
 235                die(_("--keep-unreachable and -A are incompatible"));
 236
 237        if (pack_kept_objects < 0)
 238                pack_kept_objects = write_bitmaps;
 239
 240        if (write_bitmaps && !(pack_everything & ALL_INTO_ONE))
 241                die(_(incremental_bitmap_conflict_error));
 242
 243        packdir = mkpathdup("%s/pack", get_object_directory());
 244        packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
 245
 246        sigchain_push_common(remove_pack_on_signal);
 247
 248        argv_array_push(&cmd.args, "pack-objects");
 249        argv_array_push(&cmd.args, "--keep-true-parents");
 250        if (!pack_kept_objects)
 251                argv_array_push(&cmd.args, "--honor-pack-keep");
 252        for (i = 0; i < keep_pack_list.nr; i++)
 253                argv_array_pushf(&cmd.args, "--keep-pack=%s",
 254                                 keep_pack_list.items[i].string);
 255        argv_array_push(&cmd.args, "--non-empty");
 256        argv_array_push(&cmd.args, "--all");
 257        argv_array_push(&cmd.args, "--reflog");
 258        argv_array_push(&cmd.args, "--indexed-objects");
 259        if (repository_format_partial_clone)
 260                argv_array_push(&cmd.args, "--exclude-promisor-objects");
 261        if (window)
 262                argv_array_pushf(&cmd.args, "--window=%s", window);
 263        if (window_memory)
 264                argv_array_pushf(&cmd.args, "--window-memory=%s", window_memory);
 265        if (depth)
 266                argv_array_pushf(&cmd.args, "--depth=%s", depth);
 267        if (threads)
 268                argv_array_pushf(&cmd.args, "--threads=%s", threads);
 269        if (max_pack_size)
 270                argv_array_pushf(&cmd.args, "--max-pack-size=%s", max_pack_size);
 271        if (no_reuse_delta)
 272                argv_array_pushf(&cmd.args, "--no-reuse-delta");
 273        if (no_reuse_object)
 274                argv_array_pushf(&cmd.args, "--no-reuse-object");
 275        if (write_bitmaps)
 276                argv_array_push(&cmd.args, "--write-bitmap-index");
 277        if (use_delta_islands)
 278                argv_array_push(&cmd.args, "--delta-islands");
 279
 280        if (pack_everything & ALL_INTO_ONE) {
 281                get_non_kept_pack_filenames(&existing_packs, &keep_pack_list);
 282
 283                if (existing_packs.nr && delete_redundant) {
 284                        if (unpack_unreachable) {
 285                                argv_array_pushf(&cmd.args,
 286                                                "--unpack-unreachable=%s",
 287                                                unpack_unreachable);
 288                                argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 289                        } else if (pack_everything & LOOSEN_UNREACHABLE) {
 290                                argv_array_push(&cmd.args,
 291                                                "--unpack-unreachable");
 292                        } else if (keep_unreachable) {
 293                                argv_array_push(&cmd.args, "--keep-unreachable");
 294                                argv_array_push(&cmd.args, "--pack-loose-unreachable");
 295                        } else {
 296                                argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 297                        }
 298                }
 299        } else {
 300                argv_array_push(&cmd.args, "--unpacked");
 301                argv_array_push(&cmd.args, "--incremental");
 302        }
 303
 304        if (local)
 305                argv_array_push(&cmd.args,  "--local");
 306        if (quiet)
 307                argv_array_push(&cmd.args,  "--quiet");
 308        if (delta_base_offset)
 309                argv_array_push(&cmd.args,  "--delta-base-offset");
 310
 311        argv_array_push(&cmd.args, packtmp);
 312
 313        cmd.git_cmd = 1;
 314        cmd.out = -1;
 315        cmd.no_stdin = 1;
 316
 317        ret = start_command(&cmd);
 318        if (ret)
 319                return ret;
 320
 321        out = xfdopen(cmd.out, "r");
 322        while (strbuf_getline_lf(&line, out) != EOF) {
 323                if (line.len != 40)
 324                        die("repack: Expecting 40 character sha1 lines only from pack-objects.");
 325                string_list_append(&names, line.buf);
 326        }
 327        fclose(out);
 328        ret = finish_command(&cmd);
 329        if (ret)
 330                return ret;
 331
 332        if (!names.nr && !quiet)
 333                printf("Nothing new to pack.\n");
 334
 335        /*
 336         * Ok we have prepared all new packfiles.
 337         * First see if there are packs of the same name and if so
 338         * if we can move them out of the way (this can happen if we
 339         * repacked immediately after packing fully.
 340         */
 341        failed = 0;
 342        for_each_string_list_item(item, &names) {
 343                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 344                        char *fname, *fname_old;
 345                        fname = mkpathdup("%s/pack-%s%s", packdir,
 346                                                item->string, exts[ext].name);
 347                        if (!file_exists(fname)) {
 348                                free(fname);
 349                                continue;
 350                        }
 351
 352                        fname_old = mkpathdup("%s/old-%s%s", packdir,
 353                                                item->string, exts[ext].name);
 354                        if (file_exists(fname_old))
 355                                if (unlink(fname_old))
 356                                        failed = 1;
 357
 358                        if (!failed && rename(fname, fname_old)) {
 359                                free(fname);
 360                                free(fname_old);
 361                                failed = 1;
 362                                break;
 363                        } else {
 364                                string_list_append(&rollback, fname);
 365                                free(fname_old);
 366                        }
 367                }
 368                if (failed)
 369                        break;
 370        }
 371        if (failed) {
 372                struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 373                for_each_string_list_item(item, &rollback) {
 374                        char *fname, *fname_old;
 375                        fname = mkpathdup("%s/%s", packdir, item->string);
 376                        fname_old = mkpathdup("%s/old-%s", packdir, item->string);
 377                        if (rename(fname_old, fname))
 378                                string_list_append(&rollback_failure, fname);
 379                        free(fname);
 380                        free(fname_old);
 381                }
 382
 383                if (rollback_failure.nr) {
 384                        int i;
 385                        fprintf(stderr,
 386                                "WARNING: Some packs in use have been renamed by\n"
 387                                "WARNING: prefixing old- to their name, in order to\n"
 388                                "WARNING: replace them with the new version of the\n"
 389                                "WARNING: file.  But the operation failed, and the\n"
 390                                "WARNING: attempt to rename them back to their\n"
 391                                "WARNING: original names also failed.\n"
 392                                "WARNING: Please rename them in %s manually:\n", packdir);
 393                        for (i = 0; i < rollback_failure.nr; i++)
 394                                fprintf(stderr, "WARNING:   old-%s -> %s\n",
 395                                        rollback_failure.items[i].string,
 396                                        rollback_failure.items[i].string);
 397                }
 398                exit(1);
 399        }
 400
 401        /* Now the ones with the same name are out of the way... */
 402        for_each_string_list_item(item, &names) {
 403                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 404                        char *fname, *fname_old;
 405                        struct stat statbuffer;
 406                        int exists = 0;
 407                        fname = mkpathdup("%s/pack-%s%s",
 408                                        packdir, item->string, exts[ext].name);
 409                        fname_old = mkpathdup("%s-%s%s",
 410                                        packtmp, item->string, exts[ext].name);
 411                        if (!stat(fname_old, &statbuffer)) {
 412                                statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 413                                chmod(fname_old, statbuffer.st_mode);
 414                                exists = 1;
 415                        }
 416                        if (exists || !exts[ext].optional) {
 417                                if (rename(fname_old, fname))
 418                                        die_errno(_("renaming '%s' failed"), fname_old);
 419                        }
 420                        free(fname);
 421                        free(fname_old);
 422                }
 423        }
 424
 425        /* Remove the "old-" files */
 426        for_each_string_list_item(item, &names) {
 427                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 428                        char *fname;
 429                        fname = mkpathdup("%s/old-%s%s",
 430                                          packdir,
 431                                          item->string,
 432                                          exts[ext].name);
 433                        if (remove_path(fname))
 434                                warning(_("failed to remove '%s'"), fname);
 435                        free(fname);
 436                }
 437        }
 438
 439        /* End of pack replacement. */
 440
 441        if (delete_redundant) {
 442                int opts = 0;
 443                string_list_sort(&names);
 444                for_each_string_list_item(item, &existing_packs) {
 445                        char *sha1;
 446                        size_t len = strlen(item->string);
 447                        if (len < 40)
 448                                continue;
 449                        sha1 = item->string + len - 40;
 450                        if (!string_list_has_string(&names, sha1))
 451                                remove_redundant_pack(packdir, item->string);
 452                }
 453                if (!quiet && isatty(2))
 454                        opts |= PRUNE_PACKED_VERBOSE;
 455                prune_packed_objects(opts);
 456        }
 457
 458        if (!no_update_server_info)
 459                update_server_info(0);
 460        remove_temporary_files();
 461        string_list_clear(&names, 0);
 462        string_list_clear(&rollback, 0);
 463        string_list_clear(&existing_packs, 0);
 464        strbuf_release(&line);
 465
 466        return 0;
 467}