diff options
Diffstat (limited to 'third_party/git/builtin/repack.c')
| -rw-r--r-- | third_party/git/builtin/repack.c | 572 |
1 files changed, 572 insertions, 0 deletions
diff --git a/third_party/git/builtin/repack.c b/third_party/git/builtin/repack.c new file mode 100644 index 0000000000..632c0c0a79 --- /dev/null +++ b/third_party/git/builtin/repack.c @@ -0,0 +1,572 @@ +#include "builtin.h" +#include "cache.h" +#include "config.h" +#include "dir.h" +#include "parse-options.h" +#include "run-command.h" +#include "sigchain.h" +#include "strbuf.h" +#include "string-list.h" +#include "argv-array.h" +#include "midx.h" +#include "packfile.h" +#include "object-store.h" + +static int delta_base_offset = 1; +static int pack_kept_objects = -1; +static int write_bitmaps = -1; +static int use_delta_islands; +static char *packdir, *packtmp; + +static const char *const git_repack_usage[] = { + N_("git repack [<options>]"), + NULL +}; + +static const char incremental_bitmap_conflict_error[] = N_( +"Incremental repacks are incompatible with bitmap indexes. Use\n" +"--no-write-bitmap-index or disable the pack.writebitmaps configuration." +); + + +static int repack_config(const char *var, const char *value, void *cb) +{ + if (!strcmp(var, "repack.usedeltabaseoffset")) { + delta_base_offset = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "repack.packkeptobjects")) { + pack_kept_objects = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "repack.writebitmaps") || + !strcmp(var, "pack.writebitmaps")) { + write_bitmaps = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "repack.usedeltaislands")) { + use_delta_islands = git_config_bool(var, value); + return 0; + } + return git_default_config(var, value, cb); +} + +/* + * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files. + */ +static void remove_temporary_files(void) +{ + struct strbuf buf = STRBUF_INIT; + size_t dirlen, prefixlen; + DIR *dir; + struct dirent *e; + + dir = opendir(packdir); + if (!dir) + return; + + /* Point at the slash at the end of ".../objects/pack/" */ + dirlen = strlen(packdir) + 1; + strbuf_addstr(&buf, packtmp); + /* Hold the length of ".tmp-%d-pack-" */ + prefixlen = buf.len - dirlen; + + while ((e = readdir(dir))) { + if (strncmp(e->d_name, buf.buf + dirlen, prefixlen)) + continue; + strbuf_setlen(&buf, dirlen); + strbuf_addstr(&buf, e->d_name); + unlink(buf.buf); + } + closedir(dir); + strbuf_release(&buf); +} + +static void remove_pack_on_signal(int signo) +{ + remove_temporary_files(); + sigchain_pop(signo); + raise(signo); +} + +/* + * Adds all packs hex strings to the fname list, which do not + * have a corresponding .keep file. These packs are not to + * be kept if we are going to pack everything into one file. + */ +static void get_non_kept_pack_filenames(struct string_list *fname_list, + const struct string_list *extra_keep) +{ + DIR *dir; + struct dirent *e; + char *fname; + + if (!(dir = opendir(packdir))) + return; + + while ((e = readdir(dir)) != NULL) { + size_t len; + int i; + + for (i = 0; i < extra_keep->nr; i++) + if (!fspathcmp(e->d_name, extra_keep->items[i].string)) + break; + if (extra_keep->nr > 0 && i < extra_keep->nr) + continue; + + if (!strip_suffix(e->d_name, ".pack", &len)) + continue; + + fname = xmemdupz(e->d_name, len); + + if (!file_exists(mkpath("%s/%s.keep", packdir, fname))) + string_list_append_nodup(fname_list, fname); + else + free(fname); + } + closedir(dir); +} + +static void remove_redundant_pack(const char *dir_name, const char *base_name) +{ + struct strbuf buf = STRBUF_INIT; + strbuf_addf(&buf, "%s/%s.pack", dir_name, base_name); + unlink_pack_path(buf.buf, 1); + strbuf_release(&buf); +} + +struct pack_objects_args { + const char *window; + const char *window_memory; + const char *depth; + const char *threads; + const char *max_pack_size; + int no_reuse_delta; + int no_reuse_object; + int quiet; + int local; +}; + +static void prepare_pack_objects(struct child_process *cmd, + const struct pack_objects_args *args) +{ + argv_array_push(&cmd->args, "pack-objects"); + if (args->window) + argv_array_pushf(&cmd->args, "--window=%s", args->window); + if (args->window_memory) + argv_array_pushf(&cmd->args, "--window-memory=%s", args->window_memory); + if (args->depth) + argv_array_pushf(&cmd->args, "--depth=%s", args->depth); + if (args->threads) + argv_array_pushf(&cmd->args, "--threads=%s", args->threads); + if (args->max_pack_size) + argv_array_pushf(&cmd->args, "--max-pack-size=%s", args->max_pack_size); + if (args->no_reuse_delta) + argv_array_pushf(&cmd->args, "--no-reuse-delta"); + if (args->no_reuse_object) + argv_array_pushf(&cmd->args, "--no-reuse-object"); + if (args->local) + argv_array_push(&cmd->args, "--local"); + if (args->quiet) + argv_array_push(&cmd->args, "--quiet"); + if (delta_base_offset) + argv_array_push(&cmd->args, "--delta-base-offset"); + argv_array_push(&cmd->args, packtmp); + cmd->git_cmd = 1; + cmd->out = -1; +} + +/* + * Write oid to the given struct child_process's stdin, starting it first if + * necessary. + */ +static int write_oid(const struct object_id *oid, struct packed_git *pack, + uint32_t pos, void *data) +{ + struct child_process *cmd = data; + + if (cmd->in == -1) { + if (start_command(cmd)) + die(_("could not start pack-objects to repack promisor objects")); + } + + xwrite(cmd->in, oid_to_hex(oid), GIT_SHA1_HEXSZ); + xwrite(cmd->in, "\n", 1); + return 0; +} + +static void repack_promisor_objects(const struct pack_objects_args *args, + struct string_list *names) +{ + struct child_process cmd = CHILD_PROCESS_INIT; + FILE *out; + struct strbuf line = STRBUF_INIT; + + prepare_pack_objects(&cmd, args); + cmd.in = -1; + + /* + * NEEDSWORK: Giving pack-objects only the OIDs without any ordering + * hints may result in suboptimal deltas in the resulting pack. See if + * the OIDs can be sent with fake paths such that pack-objects can use a + * {type -> existing pack order} ordering when computing deltas instead + * of a {type -> size} ordering, which may produce better deltas. + */ + for_each_packed_object(write_oid, &cmd, + FOR_EACH_OBJECT_PROMISOR_ONLY); + + if (cmd.in == -1) + /* No packed objects; cmd was never started */ + return; + + close(cmd.in); + + out = xfdopen(cmd.out, "r"); + while (strbuf_getline_lf(&line, out) != EOF) { + char *promisor_name; + int fd; + if (line.len != the_hash_algo->hexsz) + die(_("repack: Expecting full hex object ID lines only from pack-objects.")); + string_list_append(names, line.buf); + + /* + * pack-objects creates the .pack and .idx files, but not the + * .promisor file. Create the .promisor file, which is empty. + */ + promisor_name = mkpathdup("%s-%s.promisor", packtmp, + line.buf); + fd = open(promisor_name, O_CREAT|O_EXCL|O_WRONLY, 0600); + if (fd < 0) + die_errno(_("unable to create '%s'"), promisor_name); + close(fd); + free(promisor_name); + } + fclose(out); + if (finish_command(&cmd)) + die(_("could not finish pack-objects to repack promisor objects")); +} + +#define ALL_INTO_ONE 1 +#define LOOSEN_UNREACHABLE 2 + +int cmd_repack(int argc, const char **argv, const char *prefix) +{ + struct { + const char *name; + unsigned optional:1; + } exts[] = { + {".pack"}, + {".idx"}, + {".bitmap", 1}, + {".promisor", 1}, + }; + struct child_process cmd = CHILD_PROCESS_INIT; + struct string_list_item *item; + struct string_list names = STRING_LIST_INIT_DUP; + struct string_list rollback = STRING_LIST_INIT_NODUP; + struct string_list existing_packs = STRING_LIST_INIT_DUP; + struct strbuf line = STRBUF_INIT; + int i, ext, ret, failed; + FILE *out; + + /* variables to be filled by option parsing */ + int pack_everything = 0; + int delete_redundant = 0; + const char *unpack_unreachable = NULL; + int keep_unreachable = 0; + struct string_list keep_pack_list = STRING_LIST_INIT_NODUP; + int no_update_server_info = 0; + int midx_cleared = 0; + struct pack_objects_args po_args = {NULL}; + + struct option builtin_repack_options[] = { + OPT_BIT('a', NULL, &pack_everything, + N_("pack everything in a single pack"), ALL_INTO_ONE), + OPT_BIT('A', NULL, &pack_everything, + N_("same as -a, and turn unreachable objects loose"), + LOOSEN_UNREACHABLE | ALL_INTO_ONE), + OPT_BOOL('d', NULL, &delete_redundant, + N_("remove redundant packs, and run git-prune-packed")), + OPT_BOOL('f', NULL, &po_args.no_reuse_delta, + N_("pass --no-reuse-delta to git-pack-objects")), + OPT_BOOL('F', NULL, &po_args.no_reuse_object, + N_("pass --no-reuse-object to git-pack-objects")), + OPT_BOOL('n', NULL, &no_update_server_info, + N_("do not run git-update-server-info")), + OPT__QUIET(&po_args.quiet, N_("be quiet")), + OPT_BOOL('l', "local", &po_args.local, + N_("pass --local to git-pack-objects")), + OPT_BOOL('b', "write-bitmap-index", &write_bitmaps, + N_("write bitmap index")), + OPT_BOOL('i', "delta-islands", &use_delta_islands, + N_("pass --delta-islands to git-pack-objects")), + OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"), + N_("with -A, do not loosen objects older than this")), + OPT_BOOL('k', "keep-unreachable", &keep_unreachable, + N_("with -a, repack unreachable objects")), + OPT_STRING(0, "window", &po_args.window, N_("n"), + N_("size of the window used for delta compression")), + OPT_STRING(0, "window-memory", &po_args.window_memory, N_("bytes"), + N_("same as the above, but limit memory size instead of entries count")), + OPT_STRING(0, "depth", &po_args.depth, N_("n"), + N_("limits the maximum delta depth")), + OPT_STRING(0, "threads", &po_args.threads, N_("n"), + N_("limits the maximum number of threads")), + OPT_STRING(0, "max-pack-size", &po_args.max_pack_size, N_("bytes"), + N_("maximum size of each packfile")), + OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects, + N_("repack objects in packs marked with .keep")), + OPT_STRING_LIST(0, "keep-pack", &keep_pack_list, N_("name"), + N_("do not repack this pack")), + OPT_END() + }; + + git_config(repack_config, NULL); + + argc = parse_options(argc, argv, prefix, builtin_repack_options, + git_repack_usage, 0); + + if (delete_redundant && repository_format_precious_objects) + die(_("cannot delete packs in a precious-objects repo")); + + if (keep_unreachable && + (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE))) + die(_("--keep-unreachable and -A are incompatible")); + + if (write_bitmaps < 0) { + if (!(pack_everything & ALL_INTO_ONE) || + !is_bare_repository()) + write_bitmaps = 0; + } + if (pack_kept_objects < 0) + pack_kept_objects = write_bitmaps > 0; + + if (write_bitmaps && !(pack_everything & ALL_INTO_ONE)) + die(_(incremental_bitmap_conflict_error)); + + packdir = mkpathdup("%s/pack", get_object_directory()); + packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid()); + + sigchain_push_common(remove_pack_on_signal); + + prepare_pack_objects(&cmd, &po_args); + + argv_array_push(&cmd.args, "--keep-true-parents"); + if (!pack_kept_objects) + argv_array_push(&cmd.args, "--honor-pack-keep"); + for (i = 0; i < keep_pack_list.nr; i++) + argv_array_pushf(&cmd.args, "--keep-pack=%s", + keep_pack_list.items[i].string); + argv_array_push(&cmd.args, "--non-empty"); + argv_array_push(&cmd.args, "--all"); + argv_array_push(&cmd.args, "--reflog"); + argv_array_push(&cmd.args, "--indexed-objects"); + if (repository_format_partial_clone) + argv_array_push(&cmd.args, "--exclude-promisor-objects"); + if (write_bitmaps > 0) + argv_array_push(&cmd.args, "--write-bitmap-index"); + else if (write_bitmaps < 0) + argv_array_push(&cmd.args, "--write-bitmap-index-quiet"); + if (use_delta_islands) + argv_array_push(&cmd.args, "--delta-islands"); + + if (pack_everything & ALL_INTO_ONE) { + get_non_kept_pack_filenames(&existing_packs, &keep_pack_list); + + repack_promisor_objects(&po_args, &names); + + if (existing_packs.nr && delete_redundant) { + if (unpack_unreachable) { + argv_array_pushf(&cmd.args, + "--unpack-unreachable=%s", + unpack_unreachable); + argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1"); + } else if (pack_everything & LOOSEN_UNREACHABLE) { + argv_array_push(&cmd.args, + "--unpack-unreachable"); + } else if (keep_unreachable) { + argv_array_push(&cmd.args, "--keep-unreachable"); + argv_array_push(&cmd.args, "--pack-loose-unreachable"); + } else { + argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1"); + } + } + } else { + argv_array_push(&cmd.args, "--unpacked"); + argv_array_push(&cmd.args, "--incremental"); + } + + cmd.no_stdin = 1; + + ret = start_command(&cmd); + if (ret) + return ret; + + out = xfdopen(cmd.out, "r"); + while (strbuf_getline_lf(&line, out) != EOF) { + if (line.len != the_hash_algo->hexsz) + die(_("repack: Expecting full hex object ID lines only from pack-objects.")); + string_list_append(&names, line.buf); + } + fclose(out); + ret = finish_command(&cmd); + if (ret) + return ret; + + if (!names.nr && !po_args.quiet) + printf_ln(_("Nothing new to pack.")); + + close_object_store(the_repository->objects); + + /* + * Ok we have prepared all new packfiles. + * First see if there are packs of the same name and if so + * if we can move them out of the way (this can happen if we + * repacked immediately after packing fully. + */ + failed = 0; + for_each_string_list_item(item, &names) { + for (ext = 0; ext < ARRAY_SIZE(exts); ext++) { + char *fname, *fname_old; + + if (!midx_cleared) { + clear_midx_file(the_repository); + midx_cleared = 1; + } + + fname = mkpathdup("%s/pack-%s%s", packdir, + item->string, exts[ext].name); + if (!file_exists(fname)) { + free(fname); + continue; + } + + fname_old = mkpathdup("%s/old-%s%s", packdir, + item->string, exts[ext].name); + if (file_exists(fname_old)) + if (unlink(fname_old)) + failed = 1; + + if (!failed && rename(fname, fname_old)) { + free(fname); + free(fname_old); + failed = 1; + break; + } else { + string_list_append(&rollback, fname); + free(fname_old); + } + } + if (failed) + break; + } + if (failed) { + struct string_list rollback_failure = STRING_LIST_INIT_DUP; + for_each_string_list_item(item, &rollback) { + char *fname, *fname_old; + fname = mkpathdup("%s/%s", packdir, item->string); + fname_old = mkpathdup("%s/old-%s", packdir, item->string); + if (rename(fname_old, fname)) + string_list_append(&rollback_failure, fname); + free(fname); + free(fname_old); + } + + if (rollback_failure.nr) { + int i; + fprintf(stderr, + _("WARNING: Some packs in use have been renamed by\n" + "WARNING: prefixing old- to their name, in order to\n" + "WARNING: replace them with the new version of the\n" + "WARNING: file. But the operation failed, and the\n" + "WARNING: attempt to rename them back to their\n" + "WARNING: original names also failed.\n" + "WARNING: Please rename them in %s manually:\n"), packdir); + for (i = 0; i < rollback_failure.nr; i++) + fprintf(stderr, "WARNING: old-%s -> %s\n", + rollback_failure.items[i].string, + rollback_failure.items[i].string); + } + exit(1); + } + + /* Now the ones with the same name are out of the way... */ + for_each_string_list_item(item, &names) { + for (ext = 0; ext < ARRAY_SIZE(exts); ext++) { + char *fname, *fname_old; + struct stat statbuffer; + int exists = 0; + fname = mkpathdup("%s/pack-%s%s", + packdir, item->string, exts[ext].name); + fname_old = mkpathdup("%s-%s%s", + packtmp, item->string, exts[ext].name); + if (!stat(fname_old, &statbuffer)) { + statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH); + chmod(fname_old, statbuffer.st_mode); + exists = 1; + } + if (exists || !exts[ext].optional) { + if (rename(fname_old, fname)) + die_errno(_("renaming '%s' failed"), fname_old); + } + free(fname); + free(fname_old); + } + } + + /* Remove the "old-" files */ + for_each_string_list_item(item, &names) { + for (ext = 0; ext < ARRAY_SIZE(exts); ext++) { + char *fname; + fname = mkpathdup("%s/old-%s%s", + packdir, + item->string, + exts[ext].name); + if (remove_path(fname)) + warning(_("failed to remove '%s'"), fname); + free(fname); + } + } + + /* End of pack replacement. */ + + reprepare_packed_git(the_repository); + + if (delete_redundant) { + const int hexsz = the_hash_algo->hexsz; + int opts = 0; + string_list_sort(&names); + for_each_string_list_item(item, &existing_packs) { + char *sha1; + size_t len = strlen(item->string); + if (len < hexsz) + continue; + sha1 = item->string + len - hexsz; + if (!string_list_has_string(&names, sha1)) + remove_redundant_pack(packdir, item->string); + } + if (!po_args.quiet && isatty(2)) + opts |= PRUNE_PACKED_VERBOSE; + prune_packed_objects(opts); + + if (!keep_unreachable && + (!(pack_everything & LOOSEN_UNREACHABLE) || + unpack_unreachable) && + is_repository_shallow(the_repository)) + prune_shallow(PRUNE_QUICK); + } + + if (!no_update_server_info) + update_server_info(0); + remove_temporary_files(); + + if (git_env_bool(GIT_TEST_MULTI_PACK_INDEX, 0)) + write_midx_file(get_object_directory()); + + string_list_clear(&names, 0); + string_list_clear(&rollback, 0); + string_list_clear(&existing_packs, 0); + strbuf_release(&line); + + return 0; +} |