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 char *packdir, *packtmp;
  13
  14static const char *const git_repack_usage[] = {
  15        N_("git repack [options]"),
  16        NULL
  17};
  18
  19static int repack_config(const char *var, const char *value, void *cb)
  20{
  21        if (!strcmp(var, "repack.usedeltabaseoffset")) {
  22                delta_base_offset = git_config_bool(var, value);
  23                return 0;
  24        }
  25        return git_default_config(var, value, cb);
  26}
  27
  28/*
  29 * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
  30 */
  31static void remove_temporary_files(void)
  32{
  33        struct strbuf buf = STRBUF_INIT;
  34        size_t dirlen, prefixlen;
  35        DIR *dir;
  36        struct dirent *e;
  37
  38        dir = opendir(packdir);
  39        if (!dir)
  40                return;
  41
  42        /* Point at the slash at the end of ".../objects/pack/" */
  43        dirlen = strlen(packdir) + 1;
  44        strbuf_addstr(&buf, packtmp);
  45        /* Hold the length of  ".tmp-%d-pack-" */
  46        prefixlen = buf.len - dirlen;
  47
  48        while ((e = readdir(dir))) {
  49                if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
  50                        continue;
  51                strbuf_setlen(&buf, dirlen);
  52                strbuf_addstr(&buf, e->d_name);
  53                unlink(buf.buf);
  54        }
  55        closedir(dir);
  56        strbuf_release(&buf);
  57}
  58
  59static void remove_pack_on_signal(int signo)
  60{
  61        remove_temporary_files();
  62        sigchain_pop(signo);
  63        raise(signo);
  64}
  65
  66/*
  67 * Adds all packs hex strings to the fname list, which do not
  68 * have a corresponding .keep file.
  69 */
  70static void get_non_kept_pack_filenames(struct string_list *fname_list)
  71{
  72        DIR *dir;
  73        struct dirent *e;
  74        char *fname;
  75        size_t len;
  76
  77        if (!(dir = opendir(packdir)))
  78                return;
  79
  80        while ((e = readdir(dir)) != NULL) {
  81                if (suffixcmp(e->d_name, ".pack"))
  82                        continue;
  83
  84                len = strlen(e->d_name) - strlen(".pack");
  85                fname = xmemdupz(e->d_name, len);
  86
  87                if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
  88                        string_list_append_nodup(fname_list, fname);
  89                else
  90                        free(fname);
  91        }
  92        closedir(dir);
  93}
  94
  95static void remove_redundant_pack(const char *dir_name, const char *base_name)
  96{
  97        const char *exts[] = {".pack", ".idx", ".keep", ".bitmap"};
  98        int i;
  99        struct strbuf buf = STRBUF_INIT;
 100        size_t plen;
 101
 102        strbuf_addf(&buf, "%s/%s", dir_name, base_name);
 103        plen = buf.len;
 104
 105        for (i = 0; i < ARRAY_SIZE(exts); i++) {
 106                strbuf_setlen(&buf, plen);
 107                strbuf_addstr(&buf, exts[i]);
 108                unlink(buf.buf);
 109        }
 110        strbuf_release(&buf);
 111}
 112
 113#define ALL_INTO_ONE 1
 114#define LOOSEN_UNREACHABLE 2
 115
 116int cmd_repack(int argc, const char **argv, const char *prefix)
 117{
 118        struct {
 119                const char *name;
 120                unsigned optional:1;
 121        } exts[] = {
 122                {".pack"},
 123                {".idx"},
 124                {".bitmap", 1},
 125        };
 126        struct child_process cmd;
 127        struct string_list_item *item;
 128        struct argv_array cmd_args = ARGV_ARRAY_INIT;
 129        struct string_list names = STRING_LIST_INIT_DUP;
 130        struct string_list rollback = STRING_LIST_INIT_NODUP;
 131        struct string_list existing_packs = STRING_LIST_INIT_DUP;
 132        struct strbuf line = STRBUF_INIT;
 133        int nr_packs, ext, ret, failed;
 134        FILE *out;
 135
 136        /* variables to be filled by option parsing */
 137        int pack_everything = 0;
 138        int delete_redundant = 0;
 139        char *unpack_unreachable = NULL;
 140        int window = 0, window_memory = 0;
 141        int depth = 0;
 142        int max_pack_size = 0;
 143        int no_reuse_delta = 0, no_reuse_object = 0;
 144        int no_update_server_info = 0;
 145        int quiet = 0;
 146        int local = 0;
 147        int write_bitmap = -1;
 148
 149        struct option builtin_repack_options[] = {
 150                OPT_BIT('a', NULL, &pack_everything,
 151                                N_("pack everything in a single pack"), ALL_INTO_ONE),
 152                OPT_BIT('A', NULL, &pack_everything,
 153                                N_("same as -a, and turn unreachable objects loose"),
 154                                   LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 155                OPT_BOOL('d', NULL, &delete_redundant,
 156                                N_("remove redundant packs, and run git-prune-packed")),
 157                OPT_BOOL('f', NULL, &no_reuse_delta,
 158                                N_("pass --no-reuse-delta to git-pack-objects")),
 159                OPT_BOOL('F', NULL, &no_reuse_object,
 160                                N_("pass --no-reuse-object to git-pack-objects")),
 161                OPT_BOOL('n', NULL, &no_update_server_info,
 162                                N_("do not run git-update-server-info")),
 163                OPT__QUIET(&quiet, N_("be quiet")),
 164                OPT_BOOL('l', "local", &local,
 165                                N_("pass --local to git-pack-objects")),
 166                OPT_BOOL('b', "write-bitmap-index", &write_bitmap,
 167                                N_("write bitmap index")),
 168                OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 169                                N_("with -A, do not loosen objects older than this")),
 170                OPT_INTEGER(0, "window", &window,
 171                                N_("size of the window used for delta compression")),
 172                OPT_INTEGER(0, "window-memory", &window_memory,
 173                                N_("same as the above, but limit memory size instead of entries count")),
 174                OPT_INTEGER(0, "depth", &depth,
 175                                N_("limits the maximum delta depth")),
 176                OPT_INTEGER(0, "max-pack-size", &max_pack_size,
 177                                N_("maximum size of each packfile")),
 178                OPT_END()
 179        };
 180
 181        git_config(repack_config, NULL);
 182
 183        argc = parse_options(argc, argv, prefix, builtin_repack_options,
 184                                git_repack_usage, 0);
 185
 186        packdir = mkpathdup("%s/pack", get_object_directory());
 187        packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
 188
 189        sigchain_push_common(remove_pack_on_signal);
 190
 191        argv_array_push(&cmd_args, "pack-objects");
 192        argv_array_push(&cmd_args, "--keep-true-parents");
 193        argv_array_push(&cmd_args, "--honor-pack-keep");
 194        argv_array_push(&cmd_args, "--non-empty");
 195        argv_array_push(&cmd_args, "--all");
 196        argv_array_push(&cmd_args, "--reflog");
 197        if (window)
 198                argv_array_pushf(&cmd_args, "--window=%u", window);
 199        if (window_memory)
 200                argv_array_pushf(&cmd_args, "--window-memory=%u", window_memory);
 201        if (depth)
 202                argv_array_pushf(&cmd_args, "--depth=%u", depth);
 203        if (max_pack_size)
 204                argv_array_pushf(&cmd_args, "--max_pack_size=%u", max_pack_size);
 205        if (no_reuse_delta)
 206                argv_array_pushf(&cmd_args, "--no-reuse-delta");
 207        if (no_reuse_object)
 208                argv_array_pushf(&cmd_args, "--no-reuse-object");
 209        if (write_bitmap >= 0)
 210                argv_array_pushf(&cmd_args, "--%swrite-bitmap-index",
 211                                 write_bitmap ? "" : "no-");
 212
 213        if (pack_everything & ALL_INTO_ONE) {
 214                get_non_kept_pack_filenames(&existing_packs);
 215
 216                if (existing_packs.nr && delete_redundant) {
 217                        if (unpack_unreachable)
 218                                argv_array_pushf(&cmd_args,
 219                                                "--unpack-unreachable=%s",
 220                                                unpack_unreachable);
 221                        else if (pack_everything & LOOSEN_UNREACHABLE)
 222                                argv_array_push(&cmd_args,
 223                                                "--unpack-unreachable");
 224                }
 225        } else {
 226                argv_array_push(&cmd_args, "--unpacked");
 227                argv_array_push(&cmd_args, "--incremental");
 228        }
 229
 230        if (local)
 231                argv_array_push(&cmd_args,  "--local");
 232        if (quiet)
 233                argv_array_push(&cmd_args,  "--quiet");
 234        if (delta_base_offset)
 235                argv_array_push(&cmd_args,  "--delta-base-offset");
 236
 237        argv_array_push(&cmd_args, packtmp);
 238
 239        memset(&cmd, 0, sizeof(cmd));
 240        cmd.argv = cmd_args.argv;
 241        cmd.git_cmd = 1;
 242        cmd.out = -1;
 243        cmd.no_stdin = 1;
 244
 245        ret = start_command(&cmd);
 246        if (ret)
 247                return ret;
 248
 249        nr_packs = 0;
 250        out = xfdopen(cmd.out, "r");
 251        while (strbuf_getline(&line, out, '\n') != EOF) {
 252                if (line.len != 40)
 253                        die("repack: Expecting 40 character sha1 lines only from pack-objects.");
 254                string_list_append(&names, line.buf);
 255                nr_packs++;
 256        }
 257        fclose(out);
 258        ret = finish_command(&cmd);
 259        if (ret)
 260                return ret;
 261        argv_array_clear(&cmd_args);
 262
 263        if (!nr_packs && !quiet)
 264                printf("Nothing new to pack.\n");
 265
 266        /*
 267         * Ok we have prepared all new packfiles.
 268         * First see if there are packs of the same name and if so
 269         * if we can move them out of the way (this can happen if we
 270         * repacked immediately after packing fully.
 271         */
 272        failed = 0;
 273        for_each_string_list_item(item, &names) {
 274                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 275                        char *fname, *fname_old;
 276                        fname = mkpathdup("%s/%s%s", packdir,
 277                                                item->string, exts[ext].name);
 278                        if (!file_exists(fname)) {
 279                                free(fname);
 280                                continue;
 281                        }
 282
 283                        fname_old = mkpath("%s/old-%s%s", packdir,
 284                                                item->string, exts[ext].name);
 285                        if (file_exists(fname_old))
 286                                if (unlink(fname_old))
 287                                        failed = 1;
 288
 289                        if (!failed && rename(fname, fname_old)) {
 290                                free(fname);
 291                                failed = 1;
 292                                break;
 293                        } else {
 294                                string_list_append(&rollback, fname);
 295                        }
 296                }
 297                if (failed)
 298                        break;
 299        }
 300        if (failed) {
 301                struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 302                for_each_string_list_item(item, &rollback) {
 303                        char *fname, *fname_old;
 304                        fname = mkpathdup("%s/%s", packdir, item->string);
 305                        fname_old = mkpath("%s/old-%s", packdir, item->string);
 306                        if (rename(fname_old, fname))
 307                                string_list_append(&rollback_failure, fname);
 308                        free(fname);
 309                }
 310
 311                if (rollback_failure.nr) {
 312                        int i;
 313                        fprintf(stderr,
 314                                "WARNING: Some packs in use have been renamed by\n"
 315                                "WARNING: prefixing old- to their name, in order to\n"
 316                                "WARNING: replace them with the new version of the\n"
 317                                "WARNING: file.  But the operation failed, and the\n"
 318                                "WARNING: attempt to rename them back to their\n"
 319                                "WARNING: original names also failed.\n"
 320                                "WARNING: Please rename them in %s manually:\n", packdir);
 321                        for (i = 0; i < rollback_failure.nr; i++)
 322                                fprintf(stderr, "WARNING:   old-%s -> %s\n",
 323                                        rollback_failure.items[i].string,
 324                                        rollback_failure.items[i].string);
 325                }
 326                exit(1);
 327        }
 328
 329        /* Now the ones with the same name are out of the way... */
 330        for_each_string_list_item(item, &names) {
 331                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 332                        char *fname, *fname_old;
 333                        struct stat statbuffer;
 334                        int exists = 0;
 335                        fname = mkpathdup("%s/pack-%s%s",
 336                                        packdir, item->string, exts[ext].name);
 337                        fname_old = mkpathdup("%s-%s%s",
 338                                        packtmp, item->string, exts[ext].name);
 339                        if (!stat(fname_old, &statbuffer)) {
 340                                statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 341                                chmod(fname_old, statbuffer.st_mode);
 342                                exists = 1;
 343                        }
 344                        if (exists || !exts[ext].optional) {
 345                                if (rename(fname_old, fname))
 346                                        die_errno(_("renaming '%s' failed"), fname_old);
 347                        }
 348                        free(fname);
 349                        free(fname_old);
 350                }
 351        }
 352
 353        /* Remove the "old-" files */
 354        for_each_string_list_item(item, &names) {
 355                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 356                        char *fname;
 357                        fname = mkpath("%s/old-pack-%s%s",
 358                                        packdir,
 359                                        item->string,
 360                                        exts[ext].name);
 361                        if (remove_path(fname))
 362                                warning(_("removing '%s' failed"), fname);
 363                }
 364        }
 365
 366        /* End of pack replacement. */
 367
 368        if (delete_redundant) {
 369                sort_string_list(&names);
 370                for_each_string_list_item(item, &existing_packs) {
 371                        char *sha1;
 372                        size_t len = strlen(item->string);
 373                        if (len < 40)
 374                                continue;
 375                        sha1 = item->string + len - 40;
 376                        if (!string_list_has_string(&names, sha1))
 377                                remove_redundant_pack(packdir, item->string);
 378                }
 379                argv_array_push(&cmd_args, "prune-packed");
 380                if (quiet)
 381                        argv_array_push(&cmd_args, "--quiet");
 382
 383                memset(&cmd, 0, sizeof(cmd));
 384                cmd.argv = cmd_args.argv;
 385                cmd.git_cmd = 1;
 386                run_command(&cmd);
 387                argv_array_clear(&cmd_args);
 388        }
 389
 390        if (!no_update_server_info) {
 391                argv_array_push(&cmd_args, "update-server-info");
 392                memset(&cmd, 0, sizeof(cmd));
 393                cmd.argv = cmd_args.argv;
 394                cmd.git_cmd = 1;
 395                run_command(&cmd);
 396                argv_array_clear(&cmd_args);
 397        }
 398        remove_temporary_files();
 399        string_list_clear(&names, 0);
 400        string_list_clear(&rollback, 0);
 401        string_list_clear(&existing_packs, 0);
 402        strbuf_release(&line);
 403
 404        return 0;
 405}