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