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authorDjalal Harouni <tixxdz@opendz.org>2014-04-17 01:47:11 +0100
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-04-16 23:13:22 -0400
commitaf7fce1cdb6c0d6ce56bcddccbc31dd3d64a8cd8 (patch)
tree9159e713c9dba978bd8535356f6805958af7f9f4 /src
parenta1484a216e79da1fa7e2323095fb1b7203fb7a17 (diff)
install: create_symlink() check unlink() return value
create_symlink() do not check the return value of unlink(), this may confuse the user. Before the unlink() call we check the 'force' argument. If it is not set we fail with -EEXIST, otherwise we unlink() the file, therefore the next symlink() should not fail with -EEXIST (do not count races...). However since callers may not have appropriate privileges to unlink() the file we lose the -EPERM or any other errno code of unlink(), and return the -EEXIST of the next symlink(). Fix this by checking unlink() results. Before: $ systemctl --force --root=~/container-03 set-default multi-user.target Failed to set default target: File exists After: $ systemctl --force --root=~/container-03 set-default multi-user.target Failed to set default target: Permission denied
Diffstat (limited to 'src')
-rw-r--r--src/shared/install.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/shared/install.c b/src/shared/install.c
index 74090463d9..6334833812 100644
--- a/src/shared/install.c
+++ b/src/shared/install.c
@@ -1170,7 +1170,9 @@ static int create_symlink(
if (!force)
return -EEXIST;
- unlink(new_path);
+ r = unlink(new_path);
+ if (r < 0 && errno != ENOENT)
+ return -errno;
if (symlink(old_path, new_path) >= 0) {
add_file_change(changes, n_changes, UNIT_FILE_UNLINK, new_path, NULL);