systemd/0151-base_filesystem_create-do-not-try-to-create-root-if-.patch

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2014-10-04 02:43:52 +00:00
From 6f4f8056d3f972c1e6ee7f5fc40ed283fd93152a Mon Sep 17 00:00:00 2001
From: Harald Hoyer <harald@redhat.com>
Date: Wed, 3 Sep 2014 13:22:40 +0200
Subject: [PATCH] base_filesystem_create: do not try to create "/root" if it
exists
The check, if the directory/file already exists is only executed, if
there is a symlink target specified. In case of "/root", there is none,
so it is unconditionally tried to create the directory.
In case of a readonly filesystem, errno != EEXIST, but errno == EROFS,
so base_filesystem_create() and switch_root does not succeed.
This patch checks for existance not only in the symlink case.
---
src/shared/base-filesystem.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/shared/base-filesystem.c b/src/shared/base-filesystem.c
index addd26ca39..ba8b829ab3 100644
--- a/src/shared/base-filesystem.c
+++ b/src/shared/base-filesystem.c
@@ -62,13 +62,13 @@ int base_filesystem_create(const char *root) {
return -errno;
for (i = 0; i < ELEMENTSOF(table); i ++) {
+ if (faccessat(fd, table[i].dir, F_OK, AT_SYMLINK_NOFOLLOW) >= 0)
+ continue;
+
if (table[i].target) {
const char *target = NULL;
const char *s;
- if (faccessat(fd, table[i].dir, F_OK, AT_SYMLINK_NOFOLLOW) >= 0)
- continue;
-
/* check if one of the targets exists */
NULSTR_FOREACH(s, table[i].target) {
if (faccessat(fd, s, F_OK, AT_SYMLINK_NOFOLLOW) < 0)