From: Linus Torvalds <torvalds@g5.osdl.org>
Date: Thu, 14 Jul 2005 00:27:48 +0000 (-0700)
Subject: Make "git-checkout" create files with O_EXCL
X-Git-Tag: v0.99.1~42
X-Git-Url: https://git.verplant.org/?a=commitdiff_plain;h=2408cff9f738459019709c8c12d0bd8a5605566f;p=git.git

Make "git-checkout" create files with O_EXCL

We should always have unlinked any old ones before, but this just makes
sure that we never over-write any old file.

A quick "grep" now shows that all the core tools that open files for
writing use O_EXCL, ie we never overwrite an existing file in place.
---

diff --git a/entry.c b/entry.c
index ded83103..792ea733 100644
--- a/entry.c
+++ b/entry.c
@@ -62,11 +62,11 @@ static int create_file(const char *path, unsigned int mode, int force)
 	int fd;
 
 	mode = (mode & 0100) ? 0777 : 0666;
-	fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
+	fd = open(path, O_WRONLY | O_TRUNC | O_CREAT | O_EXCL, mode);
 	if (fd < 0) {
 		if (errno == EISDIR && force) {
 			remove_subtree(path);
-			fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
+			fd = open(path, O_WRONLY | O_TRUNC | O_CREAT | O_EXCL, mode);
 		}
 	}
 	return fd;