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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 09:49:36 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 09:49:36 +0000
commit5ec6074f0633939fd17d94111d10c6c6b062978c (patch)
treebfaa17b5a64abc66c918e9c70969e519d9e1df8e /builtin/repack.c
parentInitial commit. (diff)
downloadgit-5ec6074f0633939fd17d94111d10c6c6b062978c.tar.xz
git-5ec6074f0633939fd17d94111d10c6c6b062978c.zip
Adding upstream version 1:2.30.2.upstream/1%2.30.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'builtin/repack.c')
-rw-r--r--builtin/repack.c535
1 files changed, 535 insertions, 0 deletions
diff --git a/builtin/repack.c b/builtin/repack.c
new file mode 100644
index 0000000..279be11
--- /dev/null
+++ b/builtin/repack.c
@@ -0,0 +1,535 @@
+#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 struct {
+ const char *name;
+ unsigned optional:1;
+} exts[] = {
+ {".pack"},
+ {".idx"},
+ {".bitmap", 1},
+ {".promisor", 1},
+};
+
+static unsigned populate_pack_exts(char *name)
+{
+ struct stat statbuf;
+ struct strbuf path = STRBUF_INIT;
+ unsigned ret = 0;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(exts); i++) {
+ strbuf_reset(&path);
+ strbuf_addf(&path, "%s-%s%s", packtmp, name, exts[i].name);
+
+ if (stat(path.buf, &statbuf))
+ continue;
+
+ ret |= (1 << i);
+ }
+
+ strbuf_release(&path);
+ return ret;
+}
+
+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) {
+ struct string_list_item *item;
+ char *promisor_name;
+ int fd;
+ if (line.len != the_hash_algo->hexsz)
+ die(_("repack: Expecting full hex object ID lines only from pack-objects."));
+ item = 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);
+
+ item->util = (void *)(uintptr_t)populate_pack_exts(item->string);
+
+ 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 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;
+ 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."));
+
+ for_each_string_list_item(item, &names) {
+ item->util = (void *)(uintptr_t)populate_pack_exts(item->string);
+ }
+
+ close_object_store(the_repository->objects);
+
+ /*
+ * Ok we have prepared all new packfiles.
+ */
+ 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);
+ fname_old = mkpathdup("%s-%s%s",
+ packtmp, item->string, exts[ext].name);
+
+ if (((uintptr_t)item->util) & (1 << ext)) {
+ struct stat statbuffer;
+ if (!stat(fname_old, &statbuffer)) {
+ statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
+ chmod(fname_old, statbuffer.st_mode);
+ }
+
+ if (rename(fname_old, fname))
+ die_errno(_("renaming '%s' failed"), fname_old);
+ } else if (!exts[ext].optional)
+ die(_("missing required file: %s"), fname_old);
+ else if (unlink(fname) < 0 && errno != ENOENT)
+ die_errno(_("could not unlink: %s"), fname);
+
+ free(fname);
+ free(fname_old);
+ }
+ }
+ /* 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;
+}