[PATCH 8/8] update-cache.c: add INDEX_FILE_DIRECTORY support

[Zach Welch <zw@superlucidity.net>]

This patch give update-cache the ability for the index directory to be 
overridden by the INDEX_FILE_DIRECTORY environment variable.

This patch applies on top of:
        [PATCH 0/8] init-db.c cleanup, add INDEX_FILE_DIRECTORY support
        [PATCH 1/8] init-db.c: [RESEND] remove redundant getenv call
        [PATCH 2/8] init-db.c: [RESEND] make init-db work with common objects
        [PATCH 3/8] init-db.c: refactor directory creation
        [PATCH 4/8] init-db.c: add INDEX_FILE_DIRECTORY support
        [PATCH 5/8] init-db.c: refactor mkdir logic
        [PATCH 6/8] read-cache.c: add INDEX_FILE_DIRECTORY support
        [PATCH 7/8] read-tree.c: add INDEX_FILE_DIRECTORY support
 update-cache.c |   33 ++++++++++++++++++++++++---------
 1 files changed, 24 insertions(+), 9 deletions(-)
Signed-Off-By: Zach Welch <zw@superlucidity.net>


update-cache.c: 0d16b36d7d074e9f0a2811a40e16e9823a628ec9
--- a/update-cache.c
+++ b/update-cache.c
@@ -270,25 +270,37 @@ static int add_cacheinfo(char *arg1, cha
 	return add_cache_entry(ce, allow_add);
 }
 
-static int remove_lock = 0;
+static char *index_lock = NULL;
 
 static void remove_lock_file(void)
 {
-	if (remove_lock)
-		unlink(".git/index.lock");
+	if (index_lock)
+		unlink(index_lock);
 }
 
 int main(int argc, char **argv)
 {
-	int i, newfd, entries;
+	int i, newfd, entries, len;
 	int allow_options = 1;
+	char *index_file, *index_path;
 
-	newfd = open(".git/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600);
+	index_path = getenv(INDEX_ENVIRONMENT);
+	if (!index_path)
+		index_path = DEFAULT_INDEX_ENVIRONMENT;
+
+	len = strlen(index_path);
+	index_file = malloc(len + 7);
+	if (!index_file) error("out of memory");
+	sprintf(index_file, "%s/index", index_path);
+
+	index_lock = malloc(len + 12);
+	if (!index_lock) error("out of memory");
+	sprintf(index_lock, "%s/index.lock", index_path);
+
+	newfd = open(index_lock, O_RDWR | O_CREAT | O_EXCL, 0600);
 	if (newfd < 0)
 		die("unable to create new cachefile");
-
 	atexit(remove_lock_file);
-	remove_lock = 1;
 
 	entries = read_cache();
 	if (entries < 0)
@@ -330,9 +342,12 @@ int main(int argc, char **argv)
 			die("Unable to add %s to database", path);
 	}
 	if (write_cache(newfd, active_cache, active_nr) ||
-	    rename(".git/index.lock", ".git/index"))
+	    rename(index_lock, index_file))
 		die("Unable to write new cachefile");
 
-	remove_lock = 0;
+	free(index_file);
+	free(index_lock);
+	index_lock = NULL;
+
 	return 0;
 }