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authorStefan Beller <stefanbeller@googlemail.com>2013-09-15 15:33:20 (GMT)
committerJunio C Hamano <gitster@pobox.com>2013-09-17 20:34:50 (GMT)
commita1bbc6c0176f1fa2d4aa571cc0183a1f0ff9b285 (patch)
tree799fd445e4deb222f8699226d5ba86c02147d91d /builtin/repack.c
parent4d06473928ee574910accbde05c19ef2263abdf6 (diff)
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repack: rewrite the shell script in C
The motivation of this patch is to get closer to a goal of being able to have a core subset of git functionality built in to git. That would mean * people on Windows could get a copy of at least the core parts of Git without having to install a Unix-style shell * people using git in on servers with chrooted environments do not need to worry about standard tools lacking for shell scripts. This patch is meant to be mostly a literal translation of the git-repack script; the intent is that later patches would start using more library facilities, but this patch is meant to be as close to a no-op as possible so it doesn't do that kind of thing. Signed-off-by: Stefan Beller <stefanbeller@googlemail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin/repack.c')
-rw-r--r--builtin/repack.c387
1 files changed, 387 insertions, 0 deletions
diff --git a/builtin/repack.c b/builtin/repack.c
new file mode 100644
index 0000000..52846f8
--- /dev/null
+++ b/builtin/repack.c
@@ -0,0 +1,387 @@
+#include "builtin.h"
+#include "cache.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"
+
+static int delta_base_offset = 1;
+static char *packdir, *packtmp;
+
+static const char *const git_repack_usage[] = {
+ N_("git repack [options]"),
+ NULL
+};
+
+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;
+ }
+ 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.
+ */
+static void get_non_kept_pack_filenames(struct string_list *fname_list)
+{
+ DIR *dir;
+ struct dirent *e;
+ char *fname;
+ size_t len;
+
+ if (!(dir = opendir(packdir)))
+ return;
+
+ while ((e = readdir(dir)) != NULL) {
+ if (suffixcmp(e->d_name, ".pack"))
+ continue;
+
+ len = strlen(e->d_name) - strlen(".pack");
+ 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)
+{
+ const char *exts[] = {".pack", ".idx", ".keep"};
+ int i;
+ struct strbuf buf = STRBUF_INIT;
+ size_t plen;
+
+ strbuf_addf(&buf, "%s/%s", dir_name, base_name);
+ plen = buf.len;
+
+ for (i = 0; i < ARRAY_SIZE(exts); i++) {
+ strbuf_setlen(&buf, plen);
+ strbuf_addstr(&buf, exts[i]);
+ unlink(buf.buf);
+ }
+ strbuf_release(&buf);
+}
+
+#define ALL_INTO_ONE 1
+#define LOOSEN_UNREACHABLE 2
+
+int cmd_repack(int argc, const char **argv, const char *prefix)
+{
+ const char *exts[2] = {".pack", ".idx"};
+ struct child_process cmd;
+ struct string_list_item *item;
+ struct argv_array cmd_args = ARGV_ARRAY_INIT;
+ 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 nr_packs, ext, ret, failed;
+ FILE *out;
+
+ /* variables to be filled by option parsing */
+ int pack_everything = 0;
+ int delete_redundant = 0;
+ char *unpack_unreachable = NULL;
+ int window = 0, window_memory = 0;
+ int depth = 0;
+ int max_pack_size = 0;
+ int no_reuse_delta = 0, no_reuse_object = 0;
+ int no_update_server_info = 0;
+ int quiet = 0;
+ int local = 0;
+
+ 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, &no_reuse_delta,
+ N_("pass --no-reuse-delta to git-pack-objects")),
+ OPT_BOOL('F', NULL, &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(&quiet, N_("be quiet")),
+ OPT_BOOL('l', "local", &local,
+ N_("pass --local to git-pack-objects")),
+ OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
+ N_("with -A, do not loosen objects older than this")),
+ OPT_INTEGER(0, "window", &window,
+ N_("size of the window used for delta compression")),
+ OPT_INTEGER(0, "window-memory", &window_memory,
+ N_("same as the above, but limit memory size instead of entries count")),
+ OPT_INTEGER(0, "depth", &depth,
+ N_("limits the maximum delta depth")),
+ OPT_INTEGER(0, "max-pack-size", &max_pack_size,
+ N_("maximum size of each packfile")),
+ OPT_END()
+ };
+
+ git_config(repack_config, NULL);
+
+ argc = parse_options(argc, argv, prefix, builtin_repack_options,
+ git_repack_usage, 0);
+
+ packdir = mkpathdup("%s/pack", get_object_directory());
+ packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
+
+ sigchain_push_common(remove_pack_on_signal);
+
+ argv_array_push(&cmd_args, "pack-objects");
+ argv_array_push(&cmd_args, "--keep-true-parents");
+ argv_array_push(&cmd_args, "--honor-pack-keep");
+ argv_array_push(&cmd_args, "--non-empty");
+ argv_array_push(&cmd_args, "--all");
+ argv_array_push(&cmd_args, "--reflog");
+ if (window)
+ argv_array_pushf(&cmd_args, "--window=%u", window);
+ if (window_memory)
+ argv_array_pushf(&cmd_args, "--window-memory=%u", window_memory);
+ if (depth)
+ argv_array_pushf(&cmd_args, "--depth=%u", depth);
+ if (max_pack_size)
+ argv_array_pushf(&cmd_args, "--max_pack_size=%u", max_pack_size);
+ if (no_reuse_delta)
+ argv_array_pushf(&cmd_args, "--no-reuse-delta");
+ if (no_reuse_object)
+ argv_array_pushf(&cmd_args, "--no-reuse-object");
+
+ if (pack_everything & ALL_INTO_ONE) {
+ get_non_kept_pack_filenames(&existing_packs);
+
+ if (existing_packs.nr && delete_redundant) {
+ if (unpack_unreachable)
+ argv_array_pushf(&cmd_args,
+ "--unpack-unreachable=%s",
+ unpack_unreachable);
+ else if (pack_everything & LOOSEN_UNREACHABLE)
+ argv_array_push(&cmd_args,
+ "--unpack-unreachable");
+ }
+ } else {
+ argv_array_push(&cmd_args, "--unpacked");
+ argv_array_push(&cmd_args, "--incremental");
+ }
+
+ if (local)
+ argv_array_push(&cmd_args, "--local");
+ if (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);
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.argv = cmd_args.argv;
+ cmd.git_cmd = 1;
+ cmd.out = -1;
+ cmd.no_stdin = 1;
+
+ ret = start_command(&cmd);
+ if (ret)
+ return 1;
+
+ nr_packs = 0;
+ out = xfdopen(cmd.out, "r");
+ while (strbuf_getline(&line, out, '\n') != EOF) {
+ if (line.len != 40)
+ die("repack: Expecting 40 character sha1 lines only from pack-objects.");
+ string_list_append(&names, line.buf);
+ nr_packs++;
+ }
+ fclose(out);
+ ret = finish_command(&cmd);
+ if (ret)
+ return 1;
+ argv_array_clear(&cmd_args);
+
+ if (!nr_packs && !quiet)
+ printf("Nothing new to pack.\n");
+
+ /*
+ * 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 < 2; ext++) {
+ char *fname, *fname_old;
+ fname = mkpathdup("%s/%s%s", packdir,
+ item->string, exts[ext]);
+ if (!file_exists(fname)) {
+ free(fname);
+ continue;
+ }
+
+ fname_old = mkpath("%s/old-%s%s", packdir,
+ item->string, exts[ext]);
+ if (file_exists(fname_old))
+ if (unlink(fname_old))
+ failed = 1;
+
+ if (!failed && rename(fname, fname_old)) {
+ free(fname);
+ failed = 1;
+ break;
+ } else {
+ string_list_append(&rollback, fname);
+ }
+ }
+ 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 = mkpath("%s/old-%s", packdir, item->string);
+ if (rename(fname_old, fname))
+ string_list_append(&rollback_failure, fname);
+ free(fname);
+ }
+
+ 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 < 2; ext++) {
+ char *fname, *fname_old;
+ struct stat statbuffer;
+ fname = mkpathdup("%s/pack-%s%s",
+ packdir, item->string, exts[ext]);
+ fname_old = mkpathdup("%s-%s%s",
+ packtmp, item->string, exts[ext]);
+ 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))
+ exit(errno);
+ free(fname);
+ free(fname_old);
+ }
+ }
+
+ /* Remove the "old-" files */
+ for_each_string_list_item(item, &names) {
+ for (ext = 0; ext < 2; ext++) {
+ char *fname;
+ fname = mkpath("%s/old-pack-%s%s",
+ packdir,
+ item->string,
+ exts[ext]);
+ remove_path(fname);
+ }
+ }
+
+ /* End of pack replacement. */
+
+ if (delete_redundant) {
+ sort_string_list(&names);
+ for_each_string_list_item(item, &existing_packs) {
+ char *sha1;
+ size_t len = strlen(item->string);
+ if (len < 40)
+ continue;
+ sha1 = item->string + len - 40;
+ if (!string_list_has_string(&names, sha1))
+ remove_redundant_pack(packdir, item->string);
+ }
+ argv_array_push(&cmd_args, "prune-packed");
+ if (quiet)
+ argv_array_push(&cmd_args, "--quiet");
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.argv = cmd_args.argv;
+ cmd.git_cmd = 1;
+ run_command(&cmd);
+ argv_array_clear(&cmd_args);
+ }
+
+ if (!no_update_server_info) {
+ argv_array_push(&cmd_args, "update-server-info");
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.argv = cmd_args.argv;
+ cmd.git_cmd = 1;
+ run_command(&cmd);
+ argv_array_clear(&cmd_args);
+ }
+ remove_temporary_files();
+ string_list_clear(&names, 0);
+ string_list_clear(&rollback, 0);
+ string_list_clear(&existing_packs, 0);
+ strbuf_release(&line);
+
+ return 0;
+}