set_shared_perm(): sometimes we know what the final mode bits should look like

adjust_shared_perm() first obtains the mode bits from lstat(2), expecting
to find what the result of applying user's umask is, and then tweaks it
as necessary.  When the file to be adjusted is created with mkstemp(3),
however, the mode thusly obtained does not have anything to do with user's
umask, and we would need to start from 0444 in such a case and there is no
point running lstat(2) for such a path.

This introduces a new API set_shared_perm() to bypass the lstat(2) and
instead force setting the mode bits to the desired value directly.
adjust_shared_perm() becomes a thin wrapper to the function.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -613,7 +613,8 @@ enum sharedrepo {
 	PERM_EVERYBODY      = 0664,
 };
 int git_config_perm(const char *var, const char *value);
-int adjust_shared_perm(const char *path);
+int set_shared_perm(const char *path, int mode);
+#define adjust_shared_perm(path) set_shared_perm((path), 0)
 int safe_create_leading_directories(char *path);
 int safe_create_leading_directories_const(const char *path);
 char *enter_repo(char *path, int strict);

path.c

@@ -311,16 +311,23 @@ char *enter_repo(char *path, int strict)
 	return NULL;
 }
 
-int adjust_shared_perm(const char *path)
+int set_shared_perm(const char *path, int mode)
 {
 	struct stat st;
-	int mode, tweak, shared;
+	int tweak, shared, orig_mode;
 
-	if (!shared_repository)
+	if (!shared_repository) {
+		if (mode)
+			return chmod(path, mode & ~S_IFMT);
 		return 0;
-	if (lstat(path, &st) < 0)
-		return -1;
-	mode = st.st_mode;
+	}
+	if (!mode) {
+		if (lstat(path, &st) < 0)
+			return -1;
+		mode = st.st_mode;
+		orig_mode = mode;
+	} else
+		orig_mode = 0;
 	if (shared_repository < 0)
 		shared = -shared_repository;
 	else
@@ -344,9 +351,9 @@ int adjust_shared_perm(const char *path)
 	}
 
 	if (((shared_repository < 0
-	      ? (st.st_mode & (FORCE_DIR_SET_GID | 0777))
-	      : (st.st_mode & mode)) != mode) &&
-	    chmod(path, mode) < 0)
+	      ? (orig_mode & (FORCE_DIR_SET_GID | 0777))
+	      : (orig_mode & mode)) != mode) &&
+	    chmod(path, (mode & ~S_IFMT)) < 0)
 		return -2;
 	return 0;
 }

sha1_file.c

@@ -2280,7 +2280,7 @@ int move_temp_to_file(const char *tmpfile, const char *filename)
 	}
 
 out:
-	if (chmod(filename, 0444) || adjust_shared_perm(filename))
+	if (set_shared_perm(filename, (S_IFREG|0444)))
 		return error("unable to set permission to '%s'", filename);
 	return 0;
 }