Andrew's git - gitweb.git/blob

   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
  11static int delta_base_offset = 1;
  12static int pack_kept_objects = -1;
  13static int write_bitmaps;
  14static char *packdir, *packtmp;
  15
  16static const char *const git_repack_usage[] = {
  17        N_("git repack [<options>]"),
  18        NULL
  19};
  20
  21static 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 */
  42static 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
  70static 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 */
  81static 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
 105static 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
 126int 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}