For now, we still make sure to allocate at least PATH_MAX characters
for the strbuf because resolve_symlink() doesn't know how to expand
the space for its return value. (That will be fixed in a moment.)
Another alternative would be to just use a strbuf as scratch space in
lock_file() but then store a pointer to the naked string in struct
lock_file. But lock_file objects are often reused. By reusing the
same strbuf, we can avoid having to reallocate the string most times
when a lock_file object is reused.
Signed-off-by: Michael Haggerty <mhagger@xxxxxxxxxxxx>
---
builtin/commit.c | 12 ++++++------
builtin/reflog.c | 2 +-
cache.h | 2 +-
config.c | 6 +++---
lockfile.c | 45 +++++++++++++++++++--------------------------
refs.c | 6 +++---
shallow.c | 6 +++---
7 files changed, 36 insertions(+), 43 deletions(-)
diff --git a/builtin/commit.c b/builtin/commit.c
index 8ffb3ef..38c137f 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -330,7 +330,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
die(_("unable to create temporary index"));
old_index_env = getenv(INDEX_ENVIRONMENT);
- setenv(INDEX_ENVIRONMENT, index_lock.filename, 1);
+ setenv(INDEX_ENVIRONMENT, index_lock.filename.buf, 1);
if (interactive_add(argc, argv, prefix, patch_interactive) != 0)
die(_("interactive add failed"));
@@ -341,10 +341,10 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
unsetenv(INDEX_ENVIRONMENT);
discard_cache();
- read_cache_from(index_lock.filename);
+ read_cache_from(index_lock.filename.buf);
commit_style = COMMIT_NORMAL;
- return index_lock.filename;
+ return index_lock.filename.buf;
}
/*
@@ -368,7 +368,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
close_lock_file(&index_lock))
die(_("unable to write new_index file"));
commit_style = COMMIT_NORMAL;
- return index_lock.filename;
+ return index_lock.filename.buf;
}
/*
@@ -453,9 +453,9 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
die(_("unable to write temporary index file"));
discard_cache();
- read_cache_from(false_lock.filename);
+ read_cache_from(false_lock.filename.buf);
- return false_lock.filename;
+ return false_lock.filename.buf;
}
static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn,
diff --git a/builtin/reflog.c b/builtin/reflog.c
index c12a9784..d7df34e 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -431,7 +431,7 @@ static int expire_reflog(const char *ref, const unsigned char *sha1, int unused,
write_str_in_full(lock->lock_fd, "\n") != 1 ||
close_ref(lock) < 0)) {
status |= error("Couldn't write %s",
- lock->lk->filename);
+ lock->lk->filename.buf);
unlink(newlog_path);
} else if (rename(newlog_path, log_file)) {
status |= error("cannot rename %s to %s",
diff --git a/cache.h b/cache.h
index 9019c7d..319251b 100644
--- a/cache.h
+++ b/cache.h
@@ -543,7 +543,7 @@ struct lock_file {
volatile int fd;
volatile pid_t owner;
char on_list;
- char filename[PATH_MAX];
+ struct strbuf filename;
};
#define LOCK_DIE_ON_ERROR 1
#define LOCK_NODEREF 2
diff --git a/config.c b/config.c
index 6821cef..78c3dad 100644
--- a/config.c
+++ b/config.c
@@ -1706,7 +1706,7 @@ out_free:
return ret;
write_err_out:
- ret = write_error(lock->filename);
+ ret = write_error(lock->filename.buf);
goto out_free;
}
@@ -1821,7 +1821,7 @@ int git_config_rename_section_in_file(const char *config_filename,
}
store.baselen = strlen(new_name);
if (!store_write_section(out_fd, new_name)) {
- ret = write_error(lock->filename);
+ ret = write_error(lock->filename.buf);
goto out;
}
/*
@@ -1847,7 +1847,7 @@ int git_config_rename_section_in_file(const char *config_filename,
continue;
length = strlen(output);
if (write_in_full(out_fd, output, length) != length) {
- ret = write_error(lock->filename);
+ ret = write_error(lock->filename.buf);
goto out;
}
}
diff --git a/lockfile.c b/lockfile.c
index 0aa2998..f552e33 100644
--- a/lockfile.c
+++ b/lockfile.c
@@ -184,13 +184,6 @@ static char *resolve_symlink(char *p, size_t s)
static int lock_file(struct lock_file *lk, const char *path, int flags)
{
- /*
- * subtract LOCK_SUFFIX_LEN from size to make sure there's
- * room for adding ".lock" for the lock file name:
- */
- static const size_t max_path_len = sizeof(lk->filename) -
- LOCK_SUFFIX_LEN;
-
if (!lock_file_list) {
/* One-time initialization */
sigchain_push_common(remove_lock_file_on_signal);
@@ -205,26 +198,26 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
lk->active = 0;
lk->owner = 0;
lk->on_list = 1;
- lk->filename[0] = 0;
+ strbuf_init(&lk->filename, PATH_MAX);
lk->next = lock_file_list;
lock_file_list = lk;
}
- if (strlen(path) >= max_path_len)
- return -1;
- strcpy(lk->filename, path);
- if (!(flags & LOCK_NODEREF))
- resolve_symlink(lk->filename, max_path_len);
- strcat(lk->filename, LOCK_SUFFIX);
- lk->fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666);
+ strbuf_addstr(&lk->filename, path);
+ if (!(flags & LOCK_NODEREF)) {
+ resolve_symlink(lk->filename.buf, lk->filename.alloc);
+ strbuf_setlen(&lk->filename, strlen(lk->filename.buf));
+ }
+ strbuf_addstr(&lk->filename, LOCK_SUFFIX);
+ lk->fd = open(lk->filename.buf, O_RDWR | O_CREAT | O_EXCL, 0666);
if (lk->fd < 0) {
- lk->filename[0] = 0;
+ strbuf_reset(&lk->filename);
return -1;
}
lk->owner = getpid();
lk->active = 1;
- if (adjust_shared_perm(lk->filename)) {
- error("cannot fix permission bits on %s", lk->filename);
+ if (adjust_shared_perm(lk->filename.buf)) {
+ error("cannot fix permission bits on %s", lk->filename.buf);
rollback_lock_file(lk);
return -1;
}
@@ -315,14 +308,14 @@ int commit_lock_file(struct lock_file *lk)
die("BUG: attempt to commit unlocked object");
/* remove ".lock": */
- strbuf_add(&result_file, lk->filename,
- strlen(lk->filename) - LOCK_SUFFIX_LEN);
- err = rename(lk->filename, result_file.buf);
+ strbuf_add(&result_file, lk->filename.buf,
+ lk->filename.len - LOCK_SUFFIX_LEN);
+ err = rename(lk->filename.buf, result_file.buf);
strbuf_reset(&result_file);
if (err)
return -1;
lk->active = 0;
- lk->filename[0] = 0;
+ strbuf_reset(&lk->filename);
return 0;
}
@@ -344,10 +337,10 @@ int commit_locked_index(struct lock_file *lk)
if (alternate_index_output) {
if (lk->fd >= 0 && close_lock_file(lk))
return -1;
- if (rename(lk->filename, alternate_index_output))
+ if (rename(lk->filename.buf, alternate_index_output))
return -1;
lk->active = 0;
- lk->filename[0] = 0;
+ strbuf_reset(&lk->filename);
return 0;
}
else
@@ -359,8 +352,8 @@ void rollback_lock_file(struct lock_file *lk)
if (lk->active) {
if (lk->fd >= 0)
close_lock_file(lk);
- unlink_or_warn(lk->filename);
+ unlink_or_warn(lk->filename.buf);
lk->active = 0;
- lk->filename[0] = 0;
+ strbuf_reset(&lk->filename);
}
}
diff --git a/refs.c b/refs.c
index db8057c..4bad084 100644
--- a/refs.c
+++ b/refs.c
@@ -2492,8 +2492,8 @@ static int delete_ref_loose(struct ref_lock *lock, int flag)
* lockfile name, minus ".lock":
*/
char *loose_filename = xmemdupz(
- lock->lk->filename,
- strlen(lock->lk->filename) - LOCK_SUFFIX_LEN);
+ lock->lk->filename.buf,
+ lock->lk->filename.len - LOCK_SUFFIX_LEN);
int err = unlink_or_warn(loose_filename);
free(loose_filename);
if (err && errno != ENOENT)
@@ -2831,7 +2831,7 @@ int write_ref_sha1(struct ref_lock *lock,
if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
write_in_full(lock->lock_fd, &term, 1) != 1
|| close_ref(lock) < 0) {
- error("Couldn't write %s", lock->lk->filename);
+ error("Couldn't write %s", lock->lk->filename.buf);
unlock_ref(lock);
return -1;
}
diff --git a/shallow.c b/shallow.c
index 0b267b6..cb29a66 100644
--- a/shallow.c
+++ b/shallow.c
@@ -269,8 +269,8 @@ void setup_alternate_shallow(struct lock_file *shallow_lock,
if (write_shallow_commits(&sb, 0, extra)) {
if (write_in_full(fd, sb.buf, sb.len) != sb.len)
die_errno("failed to write to %s",
- shallow_lock->filename);
- *alternate_shallow_file = shallow_lock->filename;
+ shallow_lock->filename.buf);
+ *alternate_shallow_file = shallow_lock->filename.buf;
} else
/*
* is_repository_shallow() sees empty string as "no
@@ -316,7 +316,7 @@ void prune_shallow(int show_only)
if (write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY)) {
if (write_in_full(fd, sb.buf, sb.len) != sb.len)
die_errno("failed to write to %s",
- shallow_lock.filename);
+ shallow_lock.filename.buf);
commit_lock_file(&shallow_lock);
} else {
unlink(git_path("shallow"));
--
1.9.1
--
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