[PATCH v4 2/2] dracut-kdump.sh: support 'kdump-' prefixed interfaces in dump_ssh

[Ziyue Yang]

This commit makes dump_ssh
1) add 'kdump-' prefix to ipv6 hosts with 'eth*' like
interfaces before dumping to the host;
2) cancel 'StrictHostKeyChecking' for link local ipv6
address with 'eth*' like interface names, for it's not
possible to add 'kdump-' variants in hased known_hosts

Signed-off-by: Ziyue Yang <ziyang(a)redhat.com&gt;
---
 dracut-kdump.sh | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/dracut-kdump.sh b/dracut-kdump.sh
index b75c2a5..d0674b3 100755
--- a/dracut-kdump.sh
+++ b/dracut-kdump.sh
@@ -71,10 +71,27 @@ dump_raw()
 
 dump_ssh()
 {
-    local _opt="-i $1 -o BatchMode=yes -o StrictHostKeyChecking=yes"
+    local _opt="-i $1 -o BatchMode=yes"
     local _dir="$KDUMP_PATH/$HOST_IP-$DATEDIR"
     local _host=$2
 
+    # add "kdump-" prefix to network interface name for
+    # link-local ipv6 address, and cancel HostKeyChecking
+    # for it's not possible to add "kdump-" variants
+    # to hashed known_hosts
+    if [[ $_host == *":"* ]]; then
+        local _host_prefix=${_host%\%*}
+        local _ifname=${_host##*\%}
+        if [[ $_ifname == "eth"* ]]; then
+            _host="$_host_prefix%kdump-$_ifname"
+            _opt+=" -o StrictHostKeyChecking=no"
+        else
+            _opt+=" -o StrictHostKeyChecking=yes"
+        fi
+    else
+        _opt+=" -o StrictHostKeyChecking=yes"
+    fi
+
     echo "kdump: saving to $_host:$_dir"
 
     cat /var/lib/random-seed > /dev/urandom
-- 
2.9.3