Merge branch 'jc/lockfile' into next

* jc/lockfile:
  ref-log: style fixes.
  refs.c: convert it to use lockfile interface.
  Make index file locking code reusable to others.
  HTTP cleanup
  HTTP cleanup
  git-format-patch: add --output-directory long option again

Documentation/git-format-patch.txt

@@ -40,8 +40,7 @@ OPTIONS
 -------
 -o|--output-directory <dir>::
 	Use <dir> to store the resulting files, instead of the
-	current working directory. This option is ignored if
-	--stdout is specified.
+	current working directory.
 
 -n|--numbered::
 	Name output in '[PATCH n/m]' format.

Makefile

@@ -210,7 +210,7 @@ DIFF_OBJS = \
 
 LIB_OBJS = \
 	blob.o commit.o connect.o csum-file.o cache-tree.o base85.o \
-	date.o diff-delta.o entry.o exec_cmd.o ident.o index.o \
+	date.o diff-delta.o entry.o exec_cmd.o ident.o lockfile.o \
 	object.o pack-check.o patch-delta.o path.o pkt-line.o \
 	quote.o read-cache.o refs.o run-command.o dir.o \
 	server-info.o setup.o sha1_file.o sha1_name.o strbuf.o \
@@ -552,7 +552,7 @@ http.o: http.c
 	$(CC) -o $*.o -c $(ALL_CFLAGS) -DGIT_USER_AGENT='"git/$(GIT_VERSION)"' $<
 
 ifdef NO_EXPAT
-http-fetch.o: http-fetch.c
+http-fetch.o: http-fetch.c http.h
 	$(CC) -o $*.o -c $(ALL_CFLAGS) -DNO_EXPAT $<
 endif
 
@@ -576,6 +576,7 @@ git-ssh-push$X: rsh.o
 
 git-imap-send$X: imap-send.o $(LIB_FILE)
 
+http.o http-fetch.o http-push.o: http.h
 git-http-fetch$X: fetch.o http.o http-fetch.o $(LIB_FILE)
 	$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
 		$(LIBS) $(CURL_LIBCURL) $(EXPAT_LIBEXPAT)

builtin-add.c

@@ -122,7 +122,7 @@ static int add_file_to_index(const char *path, int verbose)
 	return 0;
 }
 
-static struct cache_file cache_file;
+static struct lock_file lock_file;
 
 int cmd_add(int argc, const char **argv, char **envp)
 {
@@ -134,9 +134,9 @@ int cmd_add(int argc, const char **argv, char **envp)
 
 	git_config(git_default_config);
 
-	newfd = hold_index_file_for_update(&cache_file, get_index_file());
+	newfd = hold_lock_file_for_update(&lock_file, get_index_file());
 	if (newfd < 0)
-		die("unable to create new cachefile");
+		die("unable to create new index file");
 
 	if (read_cache() < 0)
 		die("index file corrupt");
@@ -181,7 +181,7 @@ int cmd_add(int argc, const char **argv, char **envp)
 
 	if (active_cache_changed) {
 		if (write_cache(newfd, active_cache, active_nr) ||
-		    commit_index_file(&cache_file))
+		    commit_lock_file(&lock_file))
 			die("Unable to write new index file");
 	}
 

builtin-apply.c

@@ -2072,7 +2072,7 @@ static void write_out_results(struct patch *list, int skipped_patch)
 	}
 }
 
-static struct cache_file cache_file;
+static struct lock_file lock_file;
 
 static struct excludes {
 	struct excludes *next;
@@ -2133,8 +2133,12 @@ static int apply_patch(int fd, const char *filename)
 		apply = 0;
 
 	write_index = check_index && apply;
-	if (write_index && newfd < 0)
-		newfd = hold_index_file_for_update(&cache_file, get_index_file());
+	if (write_index && newfd < 0) {
+		newfd = hold_lock_file_for_update(&lock_file,
+						  get_index_file());
+		if (newfd < 0)
+			die("unable to create new index file");
+	}
 	if (check_index) {
 		if (read_cache() < 0)
 			die("unable to read index file");
@@ -2312,8 +2316,8 @@ int cmd_apply(int argc, const char **argv, char **envp)
 
 	if (write_index) {
 		if (write_cache(newfd, active_cache, active_nr) ||
-		    commit_index_file(&cache_file))
-			die("Unable to write new cachefile");
+		    commit_lock_file(&lock_file))
+			die("Unable to write new index file");
 	}
 
 	return 0;

builtin-log.c

@@ -103,7 +103,7 @@ static int git_format_config(const char *var, const char *value)
 
 
 static FILE *realstdout = NULL;
-static char *output_directory = NULL;
+static const char *output_directory = NULL;
 
 static void reopen_stdout(struct commit *commit, int nr, int keep_subject)
 {
@@ -206,14 +206,14 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
 			keep_subject = 1;
 			rev.total = -1;
 		}
-		else if (!strcmp(argv[i], "-o")) {
-			if (argc < 3)
-				die ("Which directory?");
-			if (mkdir(argv[i + 1], 0777) < 0 && errno != EEXIST)
-				die("Could not create directory %s",
-						argv[i + 1]);
-			output_directory = strdup(argv[i + 1]);
+		else if (!strcmp(argv[i], "--output-directory") ||
+			 !strcmp(argv[i], "-o")) {
 			i++;
+			if (argc <= i)
+				die("Which directory?");
+			if (output_directory)
+				die("Two output directories?");
+			output_directory = argv[i];
 		}
 		else if (!strcmp(argv[i], "--signoff") ||
 			 !strcmp(argv[i], "-s")) {
@@ -243,6 +243,14 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
 	if (argc > 1)
 		die ("unrecognized argument: %s", argv[1]);
 
+	if (output_directory) {
+		if (use_stdout)
+			die("standard output, or directory, which one?");
+		if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
+			die("Could not create directory %s",
+			    output_directory);
+	}
+
 	if (rev.pending_objects && rev.pending_objects->next == NULL) {
 		rev.pending_objects->item->flags |= UNINTERESTING;
 		add_head(&rev);
@@ -293,8 +301,6 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
 		if (!use_stdout)
 			fclose(stdout);
 	}
-	if (output_directory)
-		free(output_directory);
 	free(list);
 	return 0;
 }

builtin-read-tree.c

@@ -877,7 +877,7 @@ static void prime_cache_tree(void)
 
 static const char read_tree_usage[] = "git-read-tree (<sha> | [[-m [--aggressive] | --reset | --prefix=<prefix>] [-u | -i]] <sha1> [<sha2> [<sha3>]])";
 
-static struct cache_file cache_file;
+static struct lock_file lock_file;
 
 int cmd_read_tree(int argc, const char **argv, char **envp)
 {
@@ -888,9 +888,9 @@ int cmd_read_tree(int argc, const char **argv, char **envp)
 	setup_git_directory();
 	git_config(git_default_config);
 
-	newfd = hold_index_file_for_update(&cache_file, get_index_file());
+	newfd = hold_lock_file_for_update(&lock_file, get_index_file());
 	if (newfd < 0)
-		die("unable to create new cachefile");
+		die("unable to create new index file");
 
 	git_config(git_default_config);
 
@@ -1039,7 +1039,7 @@ int cmd_read_tree(int argc, const char **argv, char **envp)
 	}
 
 	if (write_cache(newfd, active_cache, active_nr) ||
-	    commit_index_file(&cache_file))
+	    commit_lock_file(&lock_file))
 		die("unable to write new index file");
 	return 0;
 }

builtin-rm.c

@@ -41,7 +41,7 @@ static int remove_file(const char *name)
 	return ret;
 }
 
-static struct cache_file cache_file;
+static struct lock_file lock_file;
 
 int cmd_rm(int argc, const char **argv, char **envp)
 {
@@ -53,7 +53,7 @@ int cmd_rm(int argc, const char **argv, char **envp)
 
 	git_config(git_default_config);
 
-	newfd = hold_index_file_for_update(&cache_file, get_index_file());
+	newfd = hold_lock_file_for_update(&lock_file, get_index_file());
 	if (newfd < 0)
 		die("unable to create new index file");
 
@@ -144,7 +144,7 @@ int cmd_rm(int argc, const char **argv, char **envp)
 
 	if (active_cache_changed) {
 		if (write_cache(newfd, active_cache, active_nr) ||
-		    commit_index_file(&cache_file))
+		    commit_lock_file(&lock_file))
 			die("Unable to write new index file");
 	}
 

cache.h

@@ -167,13 +167,13 @@ extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 #define REFRESH_IGNORE_MISSING	0x0008	/* ignore non-existent */
 extern int refresh_cache(unsigned int flags);
 
-struct cache_file {
-	struct cache_file *next;
-	char lockfile[PATH_MAX];
+struct lock_file {
+	struct lock_file *next;
+	char filename[PATH_MAX];
 };
-extern int hold_index_file_for_update(struct cache_file *, const char *path);
-extern int commit_index_file(struct cache_file *);
-extern void rollback_index_file(struct cache_file *);
+extern int hold_lock_file_for_update(struct lock_file *, const char *path);
+extern int commit_lock_file(struct lock_file *);
+extern void rollback_lock_file(struct lock_file *);
 
 /* Environment bits from configuration mechanism */
 extern int trust_executable_bit;

checkout-index.c

@@ -168,7 +168,7 @@ static int checkout_all(void)
 static const char checkout_cache_usage[] =
 "git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]|all] [--prefix=<string>] [--temp] [--] <file>...";
 
-static struct cache_file cache_file;
+static struct lock_file lock_file;
 
 int main(int argc, char **argv)
 {
@@ -211,9 +211,8 @@ int main(int argc, char **argv)
 		if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
 			state.refresh_cache = 1;
 			if (newfd < 0)
-				newfd = hold_index_file_for_update
-					(&cache_file,
-					 get_index_file());
+				newfd = hold_lock_file_for_update
+					(&lock_file, get_index_file());
 			if (newfd < 0)
 				die("cannot open index.lock file.");
 			continue;
@@ -262,7 +261,7 @@ int main(int argc, char **argv)
 		 */
 		if (state.refresh_cache) {
 			close(newfd); newfd = -1;
-			rollback_index_file(&cache_file);
+			rollback_lock_file(&lock_file);
 		}
 		state.refresh_cache = 0;
 	}
@@ -312,7 +311,7 @@ int main(int argc, char **argv)
 
 	if (0 <= newfd &&
 	    (write_cache(newfd, active_cache, active_nr) ||
-	     commit_index_file(&cache_file)))
-		die("Unable to write new cachefile");
+	     commit_lock_file(&lock_file)))
+		die("Unable to write new index file");
 	return 0;
 }

fetch.c

@@ -150,7 +150,8 @@ static int process(struct object *obj)
 	if (has_sha1_file(obj->sha1)) {
 		/* We already have it, so we should scan it now. */
 		obj->flags |= TO_SCAN;
-	} else {
+	}
+	else {
 		if (obj->flags & COMPLETE)
 			return 0;
 		prefetch(obj->sha1);
@@ -255,7 +256,8 @@ int pull(char *target)
 		if (write_ref_log_details) {
 			msg = xmalloc(strlen(write_ref_log_details) + 12);
 			sprintf(msg, "fetch from %s", write_ref_log_details);
-		} else
+		}
+		else
 			msg = NULL;
 		ret = write_ref_sha1(lock, sha1, msg ? msg : "fetch (unknown)");
 		if (msg)

http-push.c

@@ -186,6 +186,7 @@ static void process_response(void *callback_data)
 	finish_request(request);
 }
 
+#ifdef USE_CURL_MULTI
 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 			       void *data)
 {
@@ -349,6 +350,41 @@ static void start_fetch_loose(struct transfer_request *request)
 	}
 }
 
+static void start_mkcol(struct transfer_request *request)
+{
+	char *hex = sha1_to_hex(request->obj->sha1);
+	struct active_request_slot *slot;
+	char *posn;
+
+	request->url = xmalloc(strlen(remote->url) + 13);
+	strcpy(request->url, remote->url);
+	posn = request->url + strlen(remote->url);
+	strcpy(posn, "objects/");
+	posn += 8;
+	memcpy(posn, hex, 2);
+	posn += 2;
+	strcpy(posn, "/");
+
+	slot = get_active_slot();
+	slot->callback_func = process_response;
+	slot->callback_data = request;
+	curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
+	curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
+	curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
+	curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
+	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
+
+	if (start_active_slot(slot)) {
+		request->slot = slot;
+		request->state = RUN_MKCOL;
+	} else {
+		request->state = ABORTED;
+		free(request->url);
+		request->url = NULL;
+	}
+}
+#endif
+
 static void start_fetch_packed(struct transfer_request *request)
 {
 	char *url;
@@ -438,40 +474,6 @@ static void start_fetch_packed(struct transfer_request *request)
 	}
 }
 
-static void start_mkcol(struct transfer_request *request)
-{
-	char *hex = sha1_to_hex(request->obj->sha1);
-	struct active_request_slot *slot;
-	char *posn;
-
-	request->url = xmalloc(strlen(remote->url) + 13);
-	strcpy(request->url, remote->url);
-	posn = request->url + strlen(remote->url);
-	strcpy(posn, "objects/");
-	posn += 8;
-	memcpy(posn, hex, 2);
-	posn += 2;
-	strcpy(posn, "/");
-
-	slot = get_active_slot();
-	slot->callback_func = process_response;
-	slot->callback_data = request;
-	curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
-	curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
-	curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
-	curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
-	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
-
-	if (start_active_slot(slot)) {
-		request->slot = slot;
-		request->state = RUN_MKCOL;
-	} else {
-		request->state = ABORTED;
-		free(request->url);
-		request->url = NULL;
-	}
-}
-
 static void start_put(struct transfer_request *request)
 {
 	char *hex = sha1_to_hex(request->obj->sha1);
@@ -788,6 +790,7 @@ static void finish_request(struct transfer_request *request)
 	}
 }
 
+#ifdef USE_CURL_MULTI
 void fill_active_slots(void)
 {
 	struct transfer_request *request = request_queue_head;
@@ -821,6 +824,7 @@ void fill_active_slots(void)
 		slot = slot->next;
 	}
 }
+#endif
 
 static void get_remote_object_list(unsigned char parent);
 
@@ -851,8 +855,10 @@ static void add_fetch_request(struct object *obj)
 	request->next = request_queue_head;
 	request_queue_head = request;
 
+#ifdef USE_CURL_MULTI
 	fill_active_slots();
 	step_active_slots();
+#endif
 }
 
 static int add_send_request(struct object *obj, struct remote_lock *lock)
@@ -889,8 +895,10 @@ static int add_send_request(struct object *obj, struct remote_lock *lock)
 	request->next = request_queue_head;
 	request_queue_head = request;
 
+#ifdef USE_CURL_MULTI
 	fill_active_slots();
 	step_active_slots();
+#endif
 
 	return 1;
 }
@@ -2523,7 +2531,9 @@ int main(int argc, char **argv)
 		if (objects_to_send)
 			fprintf(stderr, "    sending %d objects\n",
 				objects_to_send);
+#ifdef USE_CURL_MULTI
 		fill_active_slots();
+#endif
 		finish_all_active_slots();
 
 		/* Update the remote branch if all went well */

http.c

@@ -286,7 +286,8 @@ void http_cleanup(void)
 	curl_multi_cleanup(curlm);
 #endif
 	curl_global_cleanup();
-	
+
+	curl_slist_free_all(pragma_header);
 }
 
 struct active_request_slot *get_active_slot(void)
@@ -438,11 +439,15 @@ void release_active_slot(struct active_request_slot *slot)
 {
 	closedown_active_slot(slot);
 	if (slot->curl) {
+#ifdef USE_CURL_MULTI
 		curl_multi_remove_handle(curlm, slot->curl);
+#endif
 		curl_easy_cleanup(slot->curl);
 		slot->curl = NULL;
 	}
+#ifdef USE_CURL_MULTI
 	fill_active_slots();
+#endif
 }
 
 static void finish_active_slot(struct active_request_slot *slot)

index.c

@@ -1,57 +0,0 @@
-/*
- * Copyright (c) 2005, Junio C Hamano
- */
-#include <signal.h>
-#include "cache.h"
-
-static struct cache_file *cache_file_list;
-
-static void remove_lock_file(void)
-{
-	while (cache_file_list) {
-		if (cache_file_list->lockfile[0])
-			unlink(cache_file_list->lockfile);
-		cache_file_list = cache_file_list->next;
-	}
-}
-
-static void remove_lock_file_on_signal(int signo)
-{
-	remove_lock_file();
-	signal(SIGINT, SIG_DFL);
-	raise(signo);
-}
-
-int hold_index_file_for_update(struct cache_file *cf, const char *path)
-{
-	int fd;
-	sprintf(cf->lockfile, "%s.lock", path);
-	fd = open(cf->lockfile, O_RDWR | O_CREAT | O_EXCL, 0666);
-	if (fd >=0 && !cf->next) {
-		cf->next = cache_file_list;
-		cache_file_list = cf;
-		signal(SIGINT, remove_lock_file_on_signal);
-		atexit(remove_lock_file);
-	}
-	return fd;
-}
-
-int commit_index_file(struct cache_file *cf)
-{
-	char indexfile[PATH_MAX];
-	int i;
-	strcpy(indexfile, cf->lockfile);
-	i = strlen(indexfile) - 5; /* .lock */
-	indexfile[i] = 0;
-	i = rename(cf->lockfile, indexfile);
-	cf->lockfile[0] = 0;
-	return i;
-}
-
-void rollback_index_file(struct cache_file *cf)
-{
-	if (cf->lockfile[0])
-		unlink(cf->lockfile);
-	cf->lockfile[0] = 0;
-}
-

lockfile.c

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2005, Junio C Hamano
+ */
+#include <signal.h>
+#include "cache.h"
+
+static struct lock_file *lock_file_list;
+
+static void remove_lock_file(void)
+{
+	while (lock_file_list) {
+		if (lock_file_list->filename[0])
+			unlink(lock_file_list->filename);
+		lock_file_list = lock_file_list->next;
+	}
+}
+
+static void remove_lock_file_on_signal(int signo)
+{
+	remove_lock_file();
+	signal(SIGINT, SIG_DFL);
+	raise(signo);
+}
+
+int hold_lock_file_for_update(struct lock_file *lk, const char *path)
+{
+	int fd;
+	sprintf(lk->filename, "%s.lock", path);
+	fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666);
+	if (fd >=0 && !lk->next) {
+		lk->next = lock_file_list;
+		lock_file_list = lk;
+		signal(SIGINT, remove_lock_file_on_signal);
+		atexit(remove_lock_file);
+	}
+	return fd;
+}
+
+int commit_lock_file(struct lock_file *lk)
+{
+	char result_file[PATH_MAX];
+	int i;
+	strcpy(result_file, lk->filename);
+	i = strlen(result_file) - 5; /* .lock */
+	result_file[i] = 0;
+	i = rename(lk->filename, result_file);
+	lk->filename[0] = 0;
+	return i;
+}
+
+void rollback_lock_file(struct lock_file *lk)
+{
+	if (lk->filename[0])
+		unlink(lk->filename);
+	lk->filename[0] = 0;
+}
+

refs.c

@@ -259,7 +259,7 @@ int check_ref_format(const char *ref)
 	}
 }
 
-static struct ref_lock* verify_lock(struct ref_lock *lock,
+static struct ref_lock *verify_lock(struct ref_lock *lock,
 	const unsigned char *old_sha1, int mustexist)
 {
 	char buf[40];
@@ -285,7 +285,7 @@ static struct ref_lock* verify_lock(struct ref_lock *lock,
 	return lock;
 }
 
-static struct ref_lock* lock_ref_sha1_basic(const char *path,
+static struct ref_lock *lock_ref_sha1_basic(const char *path,
 	int plen,
 	const unsigned char *old_sha1, int mustexist)
 {
@@ -301,19 +301,18 @@ static struct ref_lock* lock_ref_sha1_basic(const char *path,
 		unlock_ref(lock);
 		return NULL;
 	}
+	lock->lk = xcalloc(1, sizeof(struct lock_file));
 
 	lock->ref_file = strdup(path);
-	lock->lock_file = strdup(mkpath("%s.lock", lock->ref_file));
 	lock->log_file = strdup(git_path("logs/%s", lock->ref_file + plen));
 	lock->force_write = lstat(lock->ref_file, &st) && errno == ENOENT;
 
-	if (safe_create_leading_directories(lock->lock_file))
-		die("unable to create directory for %s", lock->lock_file);
-	lock->lock_fd = open(lock->lock_file,
-		O_WRONLY | O_CREAT | O_EXCL, 0666);
+	if (safe_create_leading_directories(lock->ref_file))
+		die("unable to create directory for %s", lock->ref_file);
+	lock->lock_fd = hold_lock_file_for_update(lock->lk, lock->ref_file);
 	if (lock->lock_fd < 0) {
 		error("Couldn't open lock file %s: %s",
-			lock->lock_file, strerror(errno));
+		      lock->lk->filename, strerror(errno));
 		unlock_ref(lock);
 		return NULL;
 	}
@@ -321,7 +320,7 @@ static struct ref_lock* lock_ref_sha1_basic(const char *path,
 	return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
 }
 
-struct ref_lock* lock_ref_sha1(const char *ref,
+struct ref_lock *lock_ref_sha1(const char *ref,
 	const unsigned char *old_sha1, int mustexist)
 {
 	if (check_ref_format(ref))
@@ -330,23 +329,23 @@ struct ref_lock* lock_ref_sha1(const char *ref,
 		5 + strlen(ref), old_sha1, mustexist);
 }
 
-struct ref_lock* lock_any_ref_for_update(const char *ref,
+struct ref_lock *lock_any_ref_for_update(const char *ref,
 	const unsigned char *old_sha1, int mustexist)
 {
 	return lock_ref_sha1_basic(git_path("%s", ref),
 		strlen(ref), old_sha1, mustexist);
 }
 
-void unlock_ref (struct ref_lock *lock)
+void unlock_ref(struct ref_lock *lock)
 {
 	if (lock->lock_fd >= 0) {
 		close(lock->lock_fd);
-		unlink(lock->lock_file);
+		/* Do not free lock->lk -- atexit() still looks at them */
+		if (lock->lk)
+			rollback_lock_file(lock->lk);
 	}
 	if (lock->ref_file)
 		free(lock->ref_file);
-	if (lock->lock_file)
-		free(lock->lock_file);
 	if (lock->log_file)
 		free(lock->log_file);
 	free(lock);
@@ -385,7 +384,8 @@ static int log_ref_write(struct ref_lock *lock,
 			sha1_to_hex(sha1),
 			comitter,
 			msg);
-	} else {
+	}
+	else {
 		maxlen = strlen(comitter) + 2*40 + 4;
 		logrec = xmalloc(maxlen);
 		len = snprintf(logrec, maxlen, "%s %s %s\n",
@@ -415,7 +415,7 @@ int write_ref_sha1(struct ref_lock *lock,
 	if (write(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
 	    write(lock->lock_fd, &term, 1) != 1
 		|| close(lock->lock_fd) < 0) {
-		error("Couldn't write %s", lock->lock_file);
+		error("Couldn't write %s", lock->lk->filename);
 		unlock_ref(lock);
 		return -1;
 	}
@@ -423,7 +423,7 @@ int write_ref_sha1(struct ref_lock *lock,
 		unlock_ref(lock);
 		return -1;
 	}
-	if (rename(lock->lock_file, lock->ref_file) < 0) {
+	if (commit_lock_file(lock->lk)) {
 		error("Couldn't set %s", lock->ref_file);
 		unlock_ref(lock);
 		return -1;
@@ -478,10 +478,12 @@ int read_ref_at(const char *ref, unsigned long at_time, unsigned char *sha1)
 						"warning: Log %s has gap after %s.\n",
 						logfile, show_rfc2822_date(date, tz));
 				}
-			} else if (date == at_time) {
+			}
+			else if (date == at_time) {
 				if (get_sha1_hex(rec + 41, sha1))
 					die("Log %s is corrupt.", logfile);
-			} else {
+			}
+			else {
 				if (get_sha1_hex(rec + 41, logged_sha1))
 					die("Log %s is corrupt.", logfile);
 				if (memcmp(logged_sha1, sha1, 20)) {

refs.h

@@ -3,8 +3,8 @@
 
 struct ref_lock {
 	char *ref_file;
-	char *lock_file;
 	char *log_file;
+	struct lock_file *lk;
 	unsigned char old_sha1[20];
 	int lock_fd;
 	int force_write;
@@ -24,13 +24,13 @@ extern int for_each_remote_ref(int (*fn)(const char *path, const unsigned char *
 extern int get_ref_sha1(const char *ref, unsigned char *sha1);
 
 /** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
-extern struct ref_lock* lock_ref_sha1(const char *ref, const unsigned char *old_sha1, int mustexist);
+extern struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1, int mustexist);
 
 /** Locks any ref (for 'HEAD' type refs). */
-extern struct ref_lock* lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int mustexist);
+extern struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int mustexist);
 
 /** Release any lock taken but not written. **/
-extern void unlock_ref (struct ref_lock *lock);
+extern void unlock_ref(struct ref_lock *lock);
 
 /** Writes sha1 into the ref specified by the lock. **/
 extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);

update-index.c

@@ -186,7 +186,7 @@ static void chmod_path(int flip, const char *path)
 	die("git-update-index: cannot chmod %cx '%s'", flip, path);
 }
 
-static struct cache_file cache_file;
+static struct lock_file lock_file;
 
 static void update_one(const char *path, const char *prefix, int prefix_length)
 {
@@ -489,9 +489,9 @@ int main(int argc, const char **argv)
 
 	git_config(git_default_config);
 
-	newfd = hold_index_file_for_update(&cache_file, get_index_file());
+	newfd = hold_lock_file_for_update(&lock_file, get_index_file());
 	if (newfd < 0)
-		die("unable to create new cachefile");
+		die("unable to create new index file");
 
 	entries = read_cache();
 	if (entries < 0)
@@ -645,8 +645,8 @@ int main(int argc, const char **argv)
  finish:
 	if (active_cache_changed) {
 		if (write_cache(newfd, active_cache, active_nr) ||
-		    commit_index_file(&cache_file))
-			die("Unable to write new cachefile");
+		    commit_lock_file(&lock_file))
+			die("Unable to write new index file");
 	}
 
 	return has_errors ? 1 : 0;

write-tree.c

@@ -13,7 +13,7 @@ static char *prefix = NULL;
 static const char write_tree_usage[] =
 "git-write-tree [--missing-ok] [--prefix=<prefix>/]";
 
-static struct cache_file cache_file;
+static struct lock_file lock_file;
 
 int main(int argc, char **argv)
 {
@@ -21,7 +21,7 @@ int main(int argc, char **argv)
 
 	setup_git_directory();
 
-	newfd = hold_index_file_for_update(&cache_file, get_index_file());
+	newfd = hold_lock_file_for_update(&lock_file, get_index_file());
 	entries = read_cache();
 
 	while (1 < argc) {
@@ -52,7 +52,7 @@ int main(int argc, char **argv)
 			die("git-write-tree: error building trees");
 		if (0 <= newfd) {
 			if (!write_cache(newfd, active_cache, active_nr))
-				commit_index_file(&cache_file);
+				commit_lock_file(&lock_file);
 		}
 		/* Not being able to write is fine -- we are only interested
 		 * in updating the cache-tree part, and if the next caller