builtin / repack.con commit Merge branch 'ab/perl-python-attrs' (e3ab3e8)
   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 char *packdir, *packtmp;
  16
  17static const char *const git_repack_usage[] = {
  18        N_("git repack [<options>]"),
  19        NULL
  20};
  21
  22static const char incremental_bitmap_conflict_error[] = N_(
  23"Incremental repacks are incompatible with bitmap indexes.  Use\n"
  24"--no-write-bitmap-index or disable the pack.writebitmaps configuration."
  25);
  26
  27
  28static int repack_config(const char *var, const char *value, void *cb)
  29{
  30        if (!strcmp(var, "repack.usedeltabaseoffset")) {
  31                delta_base_offset = git_config_bool(var, value);
  32                return 0;
  33        }
  34        if (!strcmp(var, "repack.packkeptobjects")) {
  35                pack_kept_objects = git_config_bool(var, value);
  36                return 0;
  37        }
  38        if (!strcmp(var, "repack.writebitmaps") ||
  39            !strcmp(var, "pack.writebitmaps")) {
  40                write_bitmaps = git_config_bool(var, value);
  41                return 0;
  42        }
  43        return git_default_config(var, value, cb);
  44}
  45
  46/*
  47 * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
  48 */
  49static void remove_temporary_files(void)
  50{
  51        struct strbuf buf = STRBUF_INIT;
  52        size_t dirlen, prefixlen;
  53        DIR *dir;
  54        struct dirent *e;
  55
  56        dir = opendir(packdir);
  57        if (!dir)
  58                return;
  59
  60        /* Point at the slash at the end of ".../objects/pack/" */
  61        dirlen = strlen(packdir) + 1;
  62        strbuf_addstr(&buf, packtmp);
  63        /* Hold the length of  ".tmp-%d-pack-" */
  64        prefixlen = buf.len - dirlen;
  65
  66        while ((e = readdir(dir))) {
  67                if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
  68                        continue;
  69                strbuf_setlen(&buf, dirlen);
  70                strbuf_addstr(&buf, e->d_name);
  71                unlink(buf.buf);
  72        }
  73        closedir(dir);
  74        strbuf_release(&buf);
  75}
  76
  77static void remove_pack_on_signal(int signo)
  78{
  79        remove_temporary_files();
  80        sigchain_pop(signo);
  81        raise(signo);
  82}
  83
  84/*
  85 * Adds all packs hex strings to the fname list, which do not
  86 * have a corresponding .keep or .promisor file. These packs are not to
  87 * be kept if we are going to pack everything into one file.
  88 */
  89static void get_non_kept_pack_filenames(struct string_list *fname_list,
  90                                        const struct string_list *extra_keep)
  91{
  92        DIR *dir;
  93        struct dirent *e;
  94        char *fname;
  95
  96        if (!(dir = opendir(packdir)))
  97                return;
  98
  99        while ((e = readdir(dir)) != NULL) {
 100                size_t len;
 101                int i;
 102
 103                for (i = 0; i < extra_keep->nr; i++)
 104                        if (!fspathcmp(e->d_name, extra_keep->items[i].string))
 105                                break;
 106                if (extra_keep->nr > 0 && i < extra_keep->nr)
 107                        continue;
 108
 109                if (!strip_suffix(e->d_name, ".pack", &len))
 110                        continue;
 111
 112                fname = xmemdupz(e->d_name, len);
 113
 114                if (!file_exists(mkpath("%s/%s.keep", packdir, fname)) &&
 115                    !file_exists(mkpath("%s/%s.promisor", packdir, fname)))
 116                        string_list_append_nodup(fname_list, fname);
 117                else
 118                        free(fname);
 119        }
 120        closedir(dir);
 121}
 122
 123static void remove_redundant_pack(const char *dir_name, const char *base_name)
 124{
 125        const char *exts[] = {".pack", ".idx", ".keep", ".bitmap"};
 126        int i;
 127        struct strbuf buf = STRBUF_INIT;
 128        size_t plen;
 129
 130        strbuf_addf(&buf, "%s/%s", dir_name, base_name);
 131        plen = buf.len;
 132
 133        for (i = 0; i < ARRAY_SIZE(exts); i++) {
 134                strbuf_setlen(&buf, plen);
 135                strbuf_addstr(&buf, exts[i]);
 136                unlink(buf.buf);
 137        }
 138        strbuf_release(&buf);
 139}
 140
 141#define ALL_INTO_ONE 1
 142#define LOOSEN_UNREACHABLE 2
 143
 144int cmd_repack(int argc, const char **argv, const char *prefix)
 145{
 146        struct {
 147                const char *name;
 148                unsigned optional:1;
 149        } exts[] = {
 150                {".pack"},
 151                {".idx"},
 152                {".bitmap", 1},
 153        };
 154        struct child_process cmd = CHILD_PROCESS_INIT;
 155        struct string_list_item *item;
 156        struct string_list names = STRING_LIST_INIT_DUP;
 157        struct string_list rollback = STRING_LIST_INIT_NODUP;
 158        struct string_list existing_packs = STRING_LIST_INIT_DUP;
 159        struct strbuf line = STRBUF_INIT;
 160        int i, ext, ret, failed;
 161        FILE *out;
 162
 163        /* variables to be filled by option parsing */
 164        int pack_everything = 0;
 165        int delete_redundant = 0;
 166        const char *unpack_unreachable = NULL;
 167        int keep_unreachable = 0;
 168        const char *window = NULL, *window_memory = NULL;
 169        const char *depth = NULL;
 170        const char *threads = NULL;
 171        const char *max_pack_size = NULL;
 172        struct string_list keep_pack_list = STRING_LIST_INIT_NODUP;
 173        int no_reuse_delta = 0, no_reuse_object = 0;
 174        int no_update_server_info = 0;
 175        int quiet = 0;
 176        int local = 0;
 177
 178        struct option builtin_repack_options[] = {
 179                OPT_BIT('a', NULL, &pack_everything,
 180                                N_("pack everything in a single pack"), ALL_INTO_ONE),
 181                OPT_BIT('A', NULL, &pack_everything,
 182                                N_("same as -a, and turn unreachable objects loose"),
 183                                   LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 184                OPT_BOOL('d', NULL, &delete_redundant,
 185                                N_("remove redundant packs, and run git-prune-packed")),
 186                OPT_BOOL('f', NULL, &no_reuse_delta,
 187                                N_("pass --no-reuse-delta to git-pack-objects")),
 188                OPT_BOOL('F', NULL, &no_reuse_object,
 189                                N_("pass --no-reuse-object to git-pack-objects")),
 190                OPT_BOOL('n', NULL, &no_update_server_info,
 191                                N_("do not run git-update-server-info")),
 192                OPT__QUIET(&quiet, N_("be quiet")),
 193                OPT_BOOL('l', "local", &local,
 194                                N_("pass --local to git-pack-objects")),
 195                OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
 196                                N_("write bitmap index")),
 197                OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 198                                N_("with -A, do not loosen objects older than this")),
 199                OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
 200                                N_("with -a, repack unreachable objects")),
 201                OPT_STRING(0, "window", &window, N_("n"),
 202                                N_("size of the window used for delta compression")),
 203                OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
 204                                N_("same as the above, but limit memory size instead of entries count")),
 205                OPT_STRING(0, "depth", &depth, N_("n"),
 206                                N_("limits the maximum delta depth")),
 207                OPT_STRING(0, "threads", &threads, N_("n"),
 208                                N_("limits the maximum number of threads")),
 209                OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
 210                                N_("maximum size of each packfile")),
 211                OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
 212                                N_("repack objects in packs marked with .keep")),
 213                OPT_STRING_LIST(0, "keep-pack", &keep_pack_list, N_("name"),
 214                                N_("do not repack this pack")),
 215                OPT_END()
 216        };
 217
 218        git_config(repack_config, NULL);
 219
 220        argc = parse_options(argc, argv, prefix, builtin_repack_options,
 221                                git_repack_usage, 0);
 222
 223        if (delete_redundant && repository_format_precious_objects)
 224                die(_("cannot delete packs in a precious-objects repo"));
 225
 226        if (keep_unreachable &&
 227            (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
 228                die(_("--keep-unreachable and -A are incompatible"));
 229
 230        if (pack_kept_objects < 0)
 231                pack_kept_objects = write_bitmaps;
 232
 233        if (write_bitmaps && !(pack_everything & ALL_INTO_ONE))
 234                die(_(incremental_bitmap_conflict_error));
 235
 236        packdir = mkpathdup("%s/pack", get_object_directory());
 237        packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
 238
 239        sigchain_push_common(remove_pack_on_signal);
 240
 241        argv_array_push(&cmd.args, "pack-objects");
 242        argv_array_push(&cmd.args, "--keep-true-parents");
 243        if (!pack_kept_objects)
 244                argv_array_push(&cmd.args, "--honor-pack-keep");
 245        for (i = 0; i < keep_pack_list.nr; i++)
 246                argv_array_pushf(&cmd.args, "--keep-pack=%s",
 247                                 keep_pack_list.items[i].string);
 248        argv_array_push(&cmd.args, "--non-empty");
 249        argv_array_push(&cmd.args, "--all");
 250        argv_array_push(&cmd.args, "--reflog");
 251        argv_array_push(&cmd.args, "--indexed-objects");
 252        if (repository_format_partial_clone)
 253                argv_array_push(&cmd.args, "--exclude-promisor-objects");
 254        if (window)
 255                argv_array_pushf(&cmd.args, "--window=%s", window);
 256        if (window_memory)
 257                argv_array_pushf(&cmd.args, "--window-memory=%s", window_memory);
 258        if (depth)
 259                argv_array_pushf(&cmd.args, "--depth=%s", depth);
 260        if (threads)
 261                argv_array_pushf(&cmd.args, "--threads=%s", threads);
 262        if (max_pack_size)
 263                argv_array_pushf(&cmd.args, "--max-pack-size=%s", max_pack_size);
 264        if (no_reuse_delta)
 265                argv_array_pushf(&cmd.args, "--no-reuse-delta");
 266        if (no_reuse_object)
 267                argv_array_pushf(&cmd.args, "--no-reuse-object");
 268        if (write_bitmaps)
 269                argv_array_push(&cmd.args, "--write-bitmap-index");
 270
 271        if (pack_everything & ALL_INTO_ONE) {
 272                get_non_kept_pack_filenames(&existing_packs, &keep_pack_list);
 273
 274                if (existing_packs.nr && delete_redundant) {
 275                        if (unpack_unreachable) {
 276                                argv_array_pushf(&cmd.args,
 277                                                "--unpack-unreachable=%s",
 278                                                unpack_unreachable);
 279                                argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 280                        } else if (pack_everything & LOOSEN_UNREACHABLE) {
 281                                argv_array_push(&cmd.args,
 282                                                "--unpack-unreachable");
 283                        } else if (keep_unreachable) {
 284                                argv_array_push(&cmd.args, "--keep-unreachable");
 285                                argv_array_push(&cmd.args, "--pack-loose-unreachable");
 286                        } else {
 287                                argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
 288                        }
 289                }
 290        } else {
 291                argv_array_push(&cmd.args, "--unpacked");
 292                argv_array_push(&cmd.args, "--incremental");
 293        }
 294
 295        if (local)
 296                argv_array_push(&cmd.args,  "--local");
 297        if (quiet)
 298                argv_array_push(&cmd.args,  "--quiet");
 299        if (delta_base_offset)
 300                argv_array_push(&cmd.args,  "--delta-base-offset");
 301
 302        argv_array_push(&cmd.args, packtmp);
 303
 304        cmd.git_cmd = 1;
 305        cmd.out = -1;
 306        cmd.no_stdin = 1;
 307
 308        ret = start_command(&cmd);
 309        if (ret)
 310                return ret;
 311
 312        out = xfdopen(cmd.out, "r");
 313        while (strbuf_getline_lf(&line, out) != EOF) {
 314                if (line.len != 40)
 315                        die("repack: Expecting 40 character sha1 lines only from pack-objects.");
 316                string_list_append(&names, line.buf);
 317        }
 318        fclose(out);
 319        ret = finish_command(&cmd);
 320        if (ret)
 321                return ret;
 322
 323        if (!names.nr && !quiet)
 324                printf("Nothing new to pack.\n");
 325
 326        /*
 327         * Ok we have prepared all new packfiles.
 328         * First see if there are packs of the same name and if so
 329         * if we can move them out of the way (this can happen if we
 330         * repacked immediately after packing fully.
 331         */
 332        failed = 0;
 333        for_each_string_list_item(item, &names) {
 334                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 335                        char *fname, *fname_old;
 336                        fname = mkpathdup("%s/pack-%s%s", packdir,
 337                                                item->string, exts[ext].name);
 338                        if (!file_exists(fname)) {
 339                                free(fname);
 340                                continue;
 341                        }
 342
 343                        fname_old = mkpathdup("%s/old-%s%s", packdir,
 344                                                item->string, exts[ext].name);
 345                        if (file_exists(fname_old))
 346                                if (unlink(fname_old))
 347                                        failed = 1;
 348
 349                        if (!failed && rename(fname, fname_old)) {
 350                                free(fname);
 351                                free(fname_old);
 352                                failed = 1;
 353                                break;
 354                        } else {
 355                                string_list_append(&rollback, fname);
 356                                free(fname_old);
 357                        }
 358                }
 359                if (failed)
 360                        break;
 361        }
 362        if (failed) {
 363                struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 364                for_each_string_list_item(item, &rollback) {
 365                        char *fname, *fname_old;
 366                        fname = mkpathdup("%s/%s", packdir, item->string);
 367                        fname_old = mkpathdup("%s/old-%s", packdir, item->string);
 368                        if (rename(fname_old, fname))
 369                                string_list_append(&rollback_failure, fname);
 370                        free(fname);
 371                        free(fname_old);
 372                }
 373
 374                if (rollback_failure.nr) {
 375                        int i;
 376                        fprintf(stderr,
 377                                "WARNING: Some packs in use have been renamed by\n"
 378                                "WARNING: prefixing old- to their name, in order to\n"
 379                                "WARNING: replace them with the new version of the\n"
 380                                "WARNING: file.  But the operation failed, and the\n"
 381                                "WARNING: attempt to rename them back to their\n"
 382                                "WARNING: original names also failed.\n"
 383                                "WARNING: Please rename them in %s manually:\n", packdir);
 384                        for (i = 0; i < rollback_failure.nr; i++)
 385                                fprintf(stderr, "WARNING:   old-%s -> %s\n",
 386                                        rollback_failure.items[i].string,
 387                                        rollback_failure.items[i].string);
 388                }
 389                exit(1);
 390        }
 391
 392        /* Now the ones with the same name are out of the way... */
 393        for_each_string_list_item(item, &names) {
 394                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 395                        char *fname, *fname_old;
 396                        struct stat statbuffer;
 397                        int exists = 0;
 398                        fname = mkpathdup("%s/pack-%s%s",
 399                                        packdir, item->string, exts[ext].name);
 400                        fname_old = mkpathdup("%s-%s%s",
 401                                        packtmp, item->string, exts[ext].name);
 402                        if (!stat(fname_old, &statbuffer)) {
 403                                statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 404                                chmod(fname_old, statbuffer.st_mode);
 405                                exists = 1;
 406                        }
 407                        if (exists || !exts[ext].optional) {
 408                                if (rename(fname_old, fname))
 409                                        die_errno(_("renaming '%s' failed"), fname_old);
 410                        }
 411                        free(fname);
 412                        free(fname_old);
 413                }
 414        }
 415
 416        /* Remove the "old-" files */
 417        for_each_string_list_item(item, &names) {
 418                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 419                        char *fname;
 420                        fname = mkpathdup("%s/old-%s%s",
 421                                          packdir,
 422                                          item->string,
 423                                          exts[ext].name);
 424                        if (remove_path(fname))
 425                                warning(_("failed to remove '%s'"), fname);
 426                        free(fname);
 427                }
 428        }
 429
 430        /* End of pack replacement. */
 431
 432        if (delete_redundant) {
 433                int opts = 0;
 434                string_list_sort(&names);
 435                for_each_string_list_item(item, &existing_packs) {
 436                        char *sha1;
 437                        size_t len = strlen(item->string);
 438                        if (len < 40)
 439                                continue;
 440                        sha1 = item->string + len - 40;
 441                        if (!string_list_has_string(&names, sha1))
 442                                remove_redundant_pack(packdir, item->string);
 443                }
 444                if (!quiet && isatty(2))
 445                        opts |= PRUNE_PACKED_VERBOSE;
 446                prune_packed_objects(opts);
 447        }
 448
 449        if (!no_update_server_info)
 450                update_server_info(0);
 451        remove_temporary_files();
 452        string_list_clear(&names, 0);
 453        string_list_clear(&rollback, 0);
 454        string_list_clear(&existing_packs, 0);
 455        strbuf_release(&line);
 456
 457        return 0;
 458}