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