postinst: check for dangling but possibly correct symlink

test -e dereferences symlinks

1 files changed, 6 insertions, 4 deletions

diff --git a/debian/openssh-known-hosts.postinst b/debian/openssh-known-hosts.postinst
index 7caf740..0d810a9 100644
--- a/debian/openssh-known-hosts.postinst
+++ b/debian/openssh-known-hosts.postinst
@@ -20,10 +20,12 @@ set -e
 
 case "$1" in
 	configure|abort-upgrade|abort-remove|abort-deconfigure)
-		[ -e /etc/ssh/ssh_known_hosts ] || ln -s /var/lib/openssh-known-hosts/ssh_known_hosts /etc/ssh/ssh_known_hosts
-		if [ "`readlink /etc/ssh/ssh_known_hosts`" != /var/lib/openssh-known-hosts/ssh_known_hosts ]; then
-			echo "/etc/ssh/ssh_known_hosts already exists, please set up the link to"
-			echo "/var/lib/openssh-known-hosts/ssh_known_hosts yourself or point to it"
+		kh_link=/etc/ssh/ssh_known_hosts
+		kh_dest=/var/lib/openssh-known-hosts/ssh_known_hosts
+		[ -L $kh_link ] || [ -e $kh_link ] || ln -s $kh_dest $kh_link
+		if [ "`readlink $kh_link`" != $kh_dest ]; then
+			echo "$kh_link already exists, please set up the link to"
+			echo "$kh_dest yourself or point to it"
 			echo "with GlobalKnownHostsFile in ssh_config(5)."
 		fi
 		;;