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- #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 "strvec.h"
- #include "midx.h"
- #include "packfile.h"
- #include "prune-packed.h"
- #include "object-store.h"
- #include "promisor-remote.h"
- #include "shallow.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;
- struct multi_pack_index *m = get_local_multi_pack_index(the_repository);
- strbuf_addf(&buf, "%s.pack", base_name);
- if (m && midx_contains_pack(m, buf.buf))
- clear_midx_file(the_repository);
- strbuf_insertf(&buf, 0, "%s/", dir_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)
- {
- strvec_push(&cmd->args, "pack-objects");
- if (args->window)
- strvec_pushf(&cmd->args, "--window=%s", args->window);
- if (args->window_memory)
- strvec_pushf(&cmd->args, "--window-memory=%s", args->window_memory);
- if (args->depth)
- strvec_pushf(&cmd->args, "--depth=%s", args->depth);
- if (args->threads)
- strvec_pushf(&cmd->args, "--threads=%s", args->threads);
- if (args->max_pack_size)
- strvec_pushf(&cmd->args, "--max-pack-size=%s", args->max_pack_size);
- if (args->no_reuse_delta)
- strvec_pushf(&cmd->args, "--no-reuse-delta");
- if (args->no_reuse_object)
- strvec_pushf(&cmd->args, "--no-reuse-object");
- if (args->local)
- strvec_push(&cmd->args, "--local");
- if (args->quiet)
- strvec_push(&cmd->args, "--quiet");
- if (delta_base_offset)
- strvec_push(&cmd->args, "--delta-base-offset");
- strvec_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), the_hash_algo->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.
- *
- * NEEDSWORK: fetch-pack sometimes generates non-empty
- * .promisor files containing the ref names and associated
- * hashes at the point of generation of the corresponding
- * packfile, but this would not preserve their contents. Maybe
- * concatenate the contents of all .promisor files instead of
- * just creating a new empty file.
- */
- 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;
- 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);
- strvec_push(&cmd.args, "--keep-true-parents");
- if (!pack_kept_objects)
- strvec_push(&cmd.args, "--honor-pack-keep");
- for (i = 0; i < keep_pack_list.nr; i++)
- strvec_pushf(&cmd.args, "--keep-pack=%s",
- keep_pack_list.items[i].string);
- strvec_push(&cmd.args, "--non-empty");
- strvec_push(&cmd.args, "--all");
- strvec_push(&cmd.args, "--reflog");
- strvec_push(&cmd.args, "--indexed-objects");
- if (has_promisor_remote())
- strvec_push(&cmd.args, "--exclude-promisor-objects");
- if (write_bitmaps > 0)
- strvec_push(&cmd.args, "--write-bitmap-index");
- else if (write_bitmaps < 0)
- strvec_push(&cmd.args, "--write-bitmap-index-quiet");
- if (use_delta_islands)
- strvec_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) {
- strvec_pushf(&cmd.args,
- "--unpack-unreachable=%s",
- unpack_unreachable);
- strvec_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
- } else if (pack_everything & LOOSEN_UNREACHABLE) {
- strvec_push(&cmd.args,
- "--unpack-unreachable");
- } else if (keep_unreachable) {
- strvec_push(&cmd.args, "--keep-unreachable");
- strvec_push(&cmd.args, "--pack-loose-unreachable");
- } else {
- strvec_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
- }
- }
- } else {
- strvec_push(&cmd.args, "--unpacked");
- strvec_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;
- 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(), 0);
- string_list_clear(&names, 0);
- string_list_clear(&rollback, 0);
- string_list_clear(&existing_packs, 0);
- strbuf_release(&line);
- return 0;
- }
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