Add git-write-blob.

A new command, git-write-blob, is introduced.  This registers
the contents of any file on the filesystem as a blob in the
object database and reports its SHA1 to the standard output.
To implement it, the patch promotes index_fd() from a static
function in update-cache.c to extern and moves it to a library
source, sha1_file.c.

This command is used to update git-merge-one-file-script so that
it does not smudge the work tree.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 25 insertions, 0 deletions

diff --git a/write-blob.c b/write-blob.c
new file mode 100644
index 0000000000..8bfd57615a
--- /dev/null
+++ b/write-blob.c
@@ -0,0 +1,25 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ */
+#include "cache.h"
+
+int main(int argc, char **argv)
+{
+	int i;
+
+	for (i = 1 ; i < argc; i++) {
+		char *path = argv[i];
+		int fd;
+		struct stat st;
+		unsigned char sha1[20];
+		fd = open(path, O_RDONLY);
+		if (fd < 0 ||
+		    fstat(fd, &st) < 0 ||
+		    index_fd(sha1, fd, &st) < 0)
+			die("Unable to add blob %s to database", path);
+		printf("%s\n", sha1_to_hex(sha1));
+	}
+	return 0;
+}