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Merge branch 'jc/lockfile'

Browse source 
* jc/lockfile:
  ref-log: style fixes.
  refs.c: convert it to use lockfile interface.
  Make index file locking code reusable to others.
This commit is contained in:
Junio C Hamano 2006-06-06 16:42:52 -07:00
commit 9941afc051
14 changed files with 127 additions and 120 deletions
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2
Makefile
View file

@ -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 \

8
builtin-add.c
View file

@ -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");
}

14
builtin-apply.c
View file

@ -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;

8
builtin-read-tree.c
View file

@ -853,7 +853,7 @@ static void prime_cache_tree(void)
static const char read_tree_usage[] = "git-read-tree (<sha> | -m [--aggressive] [-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)
{
@ -864,9 +864,9 @@ 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);
@ -981,7 +981,7 @@ 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;
}

6
builtin-rm.c
View file

@ -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");
}

12
cache.h
View file

@ -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;

13
checkout-index.c
View file

@ -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;
}

6
fetch.c
View file

@ -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)

57
index.c
View file

@ -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;
}

57
lockfile.c Normal file
View file

@ -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;
}

40
refs.c
View file

@ -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)) {

8
refs.h
View file

@ -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);

10
update-index.c
View file

@ -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;

6
write-tree.c
View file

@ -11,7 +11,7 @@ static int missing_ok = 0;
static const char write_tree_usage[] = "git-write-tree [--missing-ok]";
static struct cache_file cache_file;
static struct lock_file lock_file;
int main(int argc, char **argv)
{
@ -19,7 +19,7 @@ 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();
if (argc == 2) {
if (!strcmp(argv[1], "--missing-ok"))
@ -45,7 +45,7 @@ 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