Andrew's git / gitweb.git /
677bc7c81a2be11b287f3b05f91742216fbe1d51
   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 *max_pack_size = NULL;
 159        int no_reuse_delta = 0, no_reuse_object = 0;
 160        int no_update_server_info = 0;
 161        int quiet = 0;
 162        int local = 0;
 163
 164        struct option builtin_repack_options[] = {
 165                OPT_BIT('a', NULL, &pack_everything,
 166                                N_("pack everything in a single pack"), ALL_INTO_ONE),
 167                OPT_BIT('A', NULL, &pack_everything,
 168                                N_("same as -a, and turn unreachable objects loose"),
 169                                   LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 170                OPT_BOOL('d', NULL, &delete_redundant,
 171                                N_("remove redundant packs, and run git-prune-packed")),
 172                OPT_BOOL('f', NULL, &no_reuse_delta,
 173                                N_("pass --no-reuse-delta to git-pack-objects")),
 174                OPT_BOOL('F', NULL, &no_reuse_object,
 175                                N_("pass --no-reuse-object to git-pack-objects")),
 176                OPT_BOOL('n', NULL, &no_update_server_info,
 177                                N_("do not run git-update-server-info")),
 178                OPT__QUIET(&quiet, N_("be quiet")),
 179                OPT_BOOL('l', "local", &local,
 180                                N_("pass --local to git-pack-objects")),
 181                OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
 182                                N_("write bitmap index")),
 183                OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 184                                N_("with -A, do not loosen objects older than this")),
 185                OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
 186                                N_("with -a, repack unreachable objects")),
 187                OPT_STRING(0, "window", &window, N_("n"),
 188                                N_("size of the window used for delta compression")),
 189                OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
 190                                N_("same as the above, but limit memory size instead of entries count")),
 191                OPT_STRING(0, "depth", &depth, N_("n"),
 192                                N_("limits the maximum delta depth")),
 193                OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
 194                                N_("maximum size of each packfile")),
 195                OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
 196                                N_("repack objects in packs marked with .keep")),
 197                OPT_END()
 198        };
 199
 200        git_config(repack_config, NULL);
 201
 202        argc = parse_options(argc, argv, prefix, builtin_repack_options,
 203                                git_repack_usage, 0);
 204
 205        if (delete_redundant && repository_format_precious_objects)
 206                die(_("cannot delete packs in a precious-objects repo"));
 207
 208        if (keep_unreachable &&
 209            (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
 210                die(_("--keep-unreachable and -A are incompatible"));
 211
 212        if (pack_kept_objects < 0)
 213                pack_kept_objects = write_bitmaps;
 214
 215        if (write_bitmaps && !(pack_everything & ALL_INTO_ONE))
 216                die(_(incremental_bitmap_conflict_error));
 217
 218        packdir = mkpathdup("%s/pack", get_object_directory());
 219        packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
 220
 221        sigchain_push_common(remove_pack_on_signal);
 222
 223        argv_array_push(&cmd.args, "pack-objects");
 224        argv_array_push(&cmd.args, "--keep-true-parents");
 225        if (!pack_kept_objects)
 226                argv_array_push(&cmd.args, "--honor-pack-keep");
 227        argv_array_push(&cmd.args, "--non-empty");
 228        argv_array_push(&cmd.args, "--all");
 229        argv_array_push(&cmd.args, "--reflog");
 230        argv_array_push(&cmd.args, "--indexed-objects");
 231        if (window)
 232                argv_array_pushf(&cmd.args, "--window=%s", window);
 233        if (window_memory)
 234                argv_array_pushf(&cmd.args, "--window-memory=%s", window_memory);
 235        if (depth)
 236                argv_array_pushf(&cmd.args, "--depth=%s", depth);
 237        if (max_pack_size)
 238                argv_array_pushf(&cmd.args, "--max-pack-size=%s", max_pack_size);
 239        if (no_reuse_delta)
 240                argv_array_pushf(&cmd.args, "--no-reuse-delta");
 241        if (no_reuse_object)
 242                argv_array_pushf(&cmd.args, "--no-reuse-object");
 243        if (write_bitmaps)
 244                argv_array_push(&cmd.args, "--write-bitmap-index");
 245
 246        if (pack_everything & ALL_INTO_ONE) {
 247                get_non_kept_pack_filenames(&existing_packs);
 248
 249                if (existing_packs.nr && delete_redundant) {
 250                        if (unpack_unreachable) {
 251                                argv_array_pushf(&cmd.args,
 252                                                "--unpack-unreachable=%s",
 253                                                unpack_unreachable);
 254                                argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 255                        } else if (pack_everything & LOOSEN_UNREACHABLE) {
 256                                argv_array_push(&cmd.args,
 257                                                "--unpack-unreachable");
 258                        } else if (keep_unreachable) {
 259                                argv_array_push(&cmd.args, "--keep-unreachable");
 260                                argv_array_push(&cmd.args, "--pack-loose-unreachable");
 261                        } else {
 262                                argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 263                        }
 264                }
 265        } else {
 266                argv_array_push(&cmd.args, "--unpacked");
 267                argv_array_push(&cmd.args, "--incremental");
 268        }
 269
 270        if (local)
 271                argv_array_push(&cmd.args,  "--local");
 272        if (quiet)
 273                argv_array_push(&cmd.args,  "--quiet");
 274        if (delta_base_offset)
 275                argv_array_push(&cmd.args,  "--delta-base-offset");
 276
 277        argv_array_push(&cmd.args, packtmp);
 278
 279        cmd.git_cmd = 1;
 280        cmd.out = -1;
 281        cmd.no_stdin = 1;
 282
 283        ret = start_command(&cmd);
 284        if (ret)
 285                return ret;
 286
 287        out = xfdopen(cmd.out, "r");
 288        while (strbuf_getline_lf(&line, out) != EOF) {
 289                if (line.len != 40)
 290                        die("repack: Expecting 40 character sha1 lines only from pack-objects.");
 291                string_list_append(&names, line.buf);
 292        }
 293        fclose(out);
 294        ret = finish_command(&cmd);
 295        if (ret)
 296                return ret;
 297
 298        if (!names.nr && !quiet)
 299                printf("Nothing new to pack.\n");
 300
 301        /*
 302         * Ok we have prepared all new packfiles.
 303         * First see if there are packs of the same name and if so
 304         * if we can move them out of the way (this can happen if we
 305         * repacked immediately after packing fully.
 306         */
 307        failed = 0;
 308        for_each_string_list_item(item, &names) {
 309                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 310                        char *fname, *fname_old;
 311                        fname = mkpathdup("%s/pack-%s%s", packdir,
 312                                                item->string, exts[ext].name);
 313                        if (!file_exists(fname)) {
 314                                free(fname);
 315                                continue;
 316                        }
 317
 318                        fname_old = mkpathdup("%s/old-%s%s", packdir,
 319                                                item->string, exts[ext].name);
 320                        if (file_exists(fname_old))
 321                                if (unlink(fname_old))
 322                                        failed = 1;
 323
 324                        if (!failed && rename(fname, fname_old)) {
 325                                free(fname);
 326                                free(fname_old);
 327                                failed = 1;
 328                                break;
 329                        } else {
 330                                string_list_append(&rollback, fname);
 331                                free(fname_old);
 332                        }
 333                }
 334                if (failed)
 335                        break;
 336        }
 337        if (failed) {
 338                struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 339                for_each_string_list_item(item, &rollback) {
 340                        char *fname, *fname_old;
 341                        fname = mkpathdup("%s/%s", packdir, item->string);
 342                        fname_old = mkpathdup("%s/old-%s", packdir, item->string);
 343                        if (rename(fname_old, fname))
 344                                string_list_append(&rollback_failure, fname);
 345                        free(fname);
 346                        free(fname_old);
 347                }
 348
 349                if (rollback_failure.nr) {
 350                        int i;
 351                        fprintf(stderr,
 352                                "WARNING: Some packs in use have been renamed by\n"
 353                                "WARNING: prefixing old- to their name, in order to\n"
 354                                "WARNING: replace them with the new version of the\n"
 355                                "WARNING: file.  But the operation failed, and the\n"
 356                                "WARNING: attempt to rename them back to their\n"
 357                                "WARNING: original names also failed.\n"
 358                                "WARNING: Please rename them in %s manually:\n", packdir);
 359                        for (i = 0; i < rollback_failure.nr; i++)
 360                                fprintf(stderr, "WARNING:   old-%s -> %s\n",
 361                                        rollback_failure.items[i].string,
 362                                        rollback_failure.items[i].string);
 363                }
 364                exit(1);
 365        }
 366
 367        /* Now the ones with the same name are out of the way... */
 368        for_each_string_list_item(item, &names) {
 369                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 370                        char *fname, *fname_old;
 371                        struct stat statbuffer;
 372                        int exists = 0;
 373                        fname = mkpathdup("%s/pack-%s%s",
 374                                        packdir, item->string, exts[ext].name);
 375                        fname_old = mkpathdup("%s-%s%s",
 376                                        packtmp, item->string, exts[ext].name);
 377                        if (!stat(fname_old, &statbuffer)) {
 378                                statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 379                                chmod(fname_old, statbuffer.st_mode);
 380                                exists = 1;
 381                        }
 382                        if (exists || !exts[ext].optional) {
 383                                if (rename(fname_old, fname))
 384                                        die_errno(_("renaming '%s' failed"), fname_old);
 385                        }
 386                        free(fname);
 387                        free(fname_old);
 388                }
 389        }
 390
 391        /* Remove the "old-" files */
 392        for_each_string_list_item(item, &names) {
 393                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 394                        char *fname;
 395                        fname = mkpathdup("%s/old-%s%s",
 396                                          packdir,
 397                                          item->string,
 398                                          exts[ext].name);
 399                        if (remove_path(fname))
 400                                warning(_("failed to remove '%s'"), fname);
 401                        free(fname);
 402                }
 403        }
 404
 405        /* End of pack replacement. */
 406
 407        if (delete_redundant) {
 408                int opts = 0;
 409                string_list_sort(&names);
 410                for_each_string_list_item(item, &existing_packs) {
 411                        char *sha1;
 412                        size_t len = strlen(item->string);
 413                        if (len < 40)
 414                                continue;
 415                        sha1 = item->string + len - 40;
 416                        if (!string_list_has_string(&names, sha1))
 417                                remove_redundant_pack(packdir, item->string);
 418                }
 419                if (!quiet && isatty(2))
 420                        opts |= PRUNE_PACKED_VERBOSE;
 421                prune_packed_objects(opts);
 422        }
 423
 424        if (!no_update_server_info)
 425                update_server_info(0);
 426        remove_temporary_files();
 427        string_list_clear(&names, 0);
 428        string_list_clear(&rollback, 0);
 429        string_list_clear(&existing_packs, 0);
 430        strbuf_release(&line);
 431
 432        return 0;
 433}