Andrew's git - gitweb.git/blob

a176de2f85a8a9a0f0b5443df3e8ad62daa3eb0a
   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"};
  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        } exts[] = {
 121                {".pack"},
 122                {".idx"},
 123        };
 124        struct child_process cmd;
 125        struct string_list_item *item;
 126        struct argv_array cmd_args = ARGV_ARRAY_INIT;
 127        struct string_list names = STRING_LIST_INIT_DUP;
 128        struct string_list rollback = STRING_LIST_INIT_NODUP;
 129        struct string_list existing_packs = STRING_LIST_INIT_DUP;
 130        struct strbuf line = STRBUF_INIT;
 131        int nr_packs, ext, ret, failed;
 132        FILE *out;
 133
 134        /* variables to be filled by option parsing */
 135        int pack_everything = 0;
 136        int delete_redundant = 0;
 137        char *unpack_unreachable = NULL;
 138        int window = 0, window_memory = 0;
 139        int depth = 0;
 140        int max_pack_size = 0;
 141        int no_reuse_delta = 0, no_reuse_object = 0;
 142        int no_update_server_info = 0;
 143        int quiet = 0;
 144        int local = 0;
 145
 146        struct option builtin_repack_options[] = {
 147                OPT_BIT('a', NULL, &pack_everything,
 148                                N_("pack everything in a single pack"), ALL_INTO_ONE),
 149                OPT_BIT('A', NULL, &pack_everything,
 150                                N_("same as -a, and turn unreachable objects loose"),
 151                                   LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 152                OPT_BOOL('d', NULL, &delete_redundant,
 153                                N_("remove redundant packs, and run git-prune-packed")),
 154                OPT_BOOL('f', NULL, &no_reuse_delta,
 155                                N_("pass --no-reuse-delta to git-pack-objects")),
 156                OPT_BOOL('F', NULL, &no_reuse_object,
 157                                N_("pass --no-reuse-object to git-pack-objects")),
 158                OPT_BOOL('n', NULL, &no_update_server_info,
 159                                N_("do not run git-update-server-info")),
 160                OPT__QUIET(&quiet, N_("be quiet")),
 161                OPT_BOOL('l', "local", &local,
 162                                N_("pass --local to git-pack-objects")),
 163                OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 164                                N_("with -A, do not loosen objects older than this")),
 165                OPT_INTEGER(0, "window", &window,
 166                                N_("size of the window used for delta compression")),
 167                OPT_INTEGER(0, "window-memory", &window_memory,
 168                                N_("same as the above, but limit memory size instead of entries count")),
 169                OPT_INTEGER(0, "depth", &depth,
 170                                N_("limits the maximum delta depth")),
 171                OPT_INTEGER(0, "max-pack-size", &max_pack_size,
 172                                N_("maximum size of each packfile")),
 173                OPT_END()
 174        };
 175
 176        git_config(repack_config, NULL);
 177
 178        argc = parse_options(argc, argv, prefix, builtin_repack_options,
 179                                git_repack_usage, 0);
 180
 181        packdir = mkpathdup("%s/pack", get_object_directory());
 182        packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
 183
 184        sigchain_push_common(remove_pack_on_signal);
 185
 186        argv_array_push(&cmd_args, "pack-objects");
 187        argv_array_push(&cmd_args, "--keep-true-parents");
 188        argv_array_push(&cmd_args, "--honor-pack-keep");
 189        argv_array_push(&cmd_args, "--non-empty");
 190        argv_array_push(&cmd_args, "--all");
 191        argv_array_push(&cmd_args, "--reflog");
 192        if (window)
 193                argv_array_pushf(&cmd_args, "--window=%u", window);
 194        if (window_memory)
 195                argv_array_pushf(&cmd_args, "--window-memory=%u", window_memory);
 196        if (depth)
 197                argv_array_pushf(&cmd_args, "--depth=%u", depth);
 198        if (max_pack_size)
 199                argv_array_pushf(&cmd_args, "--max_pack_size=%u", max_pack_size);
 200        if (no_reuse_delta)
 201                argv_array_pushf(&cmd_args, "--no-reuse-delta");
 202        if (no_reuse_object)
 203                argv_array_pushf(&cmd_args, "--no-reuse-object");
 204
 205        if (pack_everything & ALL_INTO_ONE) {
 206                get_non_kept_pack_filenames(&existing_packs);
 207
 208                if (existing_packs.nr && delete_redundant) {
 209                        if (unpack_unreachable)
 210                                argv_array_pushf(&cmd_args,
 211                                                "--unpack-unreachable=%s",
 212                                                unpack_unreachable);
 213                        else if (pack_everything & LOOSEN_UNREACHABLE)
 214                                argv_array_push(&cmd_args,
 215                                                "--unpack-unreachable");
 216                }
 217        } else {
 218                argv_array_push(&cmd_args, "--unpacked");
 219                argv_array_push(&cmd_args, "--incremental");
 220        }
 221
 222        if (local)
 223                argv_array_push(&cmd_args,  "--local");
 224        if (quiet)
 225                argv_array_push(&cmd_args,  "--quiet");
 226        if (delta_base_offset)
 227                argv_array_push(&cmd_args,  "--delta-base-offset");
 228
 229        argv_array_push(&cmd_args, packtmp);
 230
 231        memset(&cmd, 0, sizeof(cmd));
 232        cmd.argv = cmd_args.argv;
 233        cmd.git_cmd = 1;
 234        cmd.out = -1;
 235        cmd.no_stdin = 1;
 236
 237        ret = start_command(&cmd);
 238        if (ret)
 239                return ret;
 240
 241        nr_packs = 0;
 242        out = xfdopen(cmd.out, "r");
 243        while (strbuf_getline(&line, out, '\n') != EOF) {
 244                if (line.len != 40)
 245                        die("repack: Expecting 40 character sha1 lines only from pack-objects.");
 246                string_list_append(&names, line.buf);
 247                nr_packs++;
 248        }
 249        fclose(out);
 250        ret = finish_command(&cmd);
 251        if (ret)
 252                return ret;
 253        argv_array_clear(&cmd_args);
 254
 255        if (!nr_packs && !quiet)
 256                printf("Nothing new to pack.\n");
 257
 258        /*
 259         * Ok we have prepared all new packfiles.
 260         * First see if there are packs of the same name and if so
 261         * if we can move them out of the way (this can happen if we
 262         * repacked immediately after packing fully.
 263         */
 264        failed = 0;
 265        for_each_string_list_item(item, &names) {
 266                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 267                        char *fname, *fname_old;
 268                        fname = mkpathdup("%s/%s%s", packdir,
 269                                                item->string, exts[ext].name);
 270                        if (!file_exists(fname)) {
 271                                free(fname);
 272                                continue;
 273                        }
 274
 275                        fname_old = mkpath("%s/old-%s%s", packdir,
 276                                                item->string, exts[ext].name);
 277                        if (file_exists(fname_old))
 278                                if (unlink(fname_old))
 279                                        failed = 1;
 280
 281                        if (!failed && rename(fname, fname_old)) {
 282                                free(fname);
 283                                failed = 1;
 284                                break;
 285                        } else {
 286                                string_list_append(&rollback, fname);
 287                        }
 288                }
 289                if (failed)
 290                        break;
 291        }
 292        if (failed) {
 293                struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 294                for_each_string_list_item(item, &rollback) {
 295                        char *fname, *fname_old;
 296                        fname = mkpathdup("%s/%s", packdir, item->string);
 297                        fname_old = mkpath("%s/old-%s", packdir, item->string);
 298                        if (rename(fname_old, fname))
 299                                string_list_append(&rollback_failure, fname);
 300                        free(fname);
 301                }
 302
 303                if (rollback_failure.nr) {
 304                        int i;
 305                        fprintf(stderr,
 306                                "WARNING: Some packs in use have been renamed by\n"
 307                                "WARNING: prefixing old- to their name, in order to\n"
 308                                "WARNING: replace them with the new version of the\n"
 309                                "WARNING: file.  But the operation failed, and the\n"
 310                                "WARNING: attempt to rename them back to their\n"
 311                                "WARNING: original names also failed.\n"
 312                                "WARNING: Please rename them in %s manually:\n", packdir);
 313                        for (i = 0; i < rollback_failure.nr; i++)
 314                                fprintf(stderr, "WARNING:   old-%s -> %s\n",
 315                                        rollback_failure.items[i].string,
 316                                        rollback_failure.items[i].string);
 317                }
 318                exit(1);
 319        }
 320
 321        /* Now the ones with the same name are out of the way... */
 322        for_each_string_list_item(item, &names) {
 323                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 324                        char *fname, *fname_old;
 325                        struct stat statbuffer;
 326                        fname = mkpathdup("%s/pack-%s%s",
 327                                        packdir, item->string, exts[ext].name);
 328                        fname_old = mkpathdup("%s-%s%s",
 329                                        packtmp, item->string, exts[ext].name);
 330                        if (!stat(fname_old, &statbuffer)) {
 331                                statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 332                                chmod(fname_old, statbuffer.st_mode);
 333                        }
 334                        if (rename(fname_old, fname))
 335                                die_errno(_("renaming '%s' failed"), fname_old);
 336                        free(fname);
 337                        free(fname_old);
 338                }
 339        }
 340
 341        /* Remove the "old-" files */
 342        for_each_string_list_item(item, &names) {
 343                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 344                        char *fname;
 345                        fname = mkpath("%s/old-pack-%s%s",
 346                                        packdir,
 347                                        item->string,
 348                                        exts[ext].name);
 349                        if (remove_path(fname))
 350                                warning(_("removing '%s' failed"), fname);
 351                }
 352        }
 353
 354        /* End of pack replacement. */
 355
 356        if (delete_redundant) {
 357                sort_string_list(&names);
 358                for_each_string_list_item(item, &existing_packs) {
 359                        char *sha1;
 360                        size_t len = strlen(item->string);
 361                        if (len < 40)
 362                                continue;
 363                        sha1 = item->string + len - 40;
 364                        if (!string_list_has_string(&names, sha1))
 365                                remove_redundant_pack(packdir, item->string);
 366                }
 367                argv_array_push(&cmd_args, "prune-packed");
 368                if (quiet)
 369                        argv_array_push(&cmd_args, "--quiet");
 370
 371                memset(&cmd, 0, sizeof(cmd));
 372                cmd.argv = cmd_args.argv;
 373                cmd.git_cmd = 1;
 374                run_command(&cmd);
 375                argv_array_clear(&cmd_args);
 376        }
 377
 378        if (!no_update_server_info) {
 379                argv_array_push(&cmd_args, "update-server-info");
 380                memset(&cmd, 0, sizeof(cmd));
 381                cmd.argv = cmd_args.argv;
 382                cmd.git_cmd = 1;
 383                run_command(&cmd);
 384                argv_array_clear(&cmd_args);
 385        }
 386        remove_temporary_files();
 387        string_list_clear(&names, 0);
 388        string_list_clear(&rollback, 0);
 389        string_list_clear(&existing_packs, 0);
 390        strbuf_release(&line);
 391
 392        return 0;
 393}