[PATCH v9 2/3] dracut-module-setup.sh: add 'kdump-' prefix in kdump.conf for link local ipv6

[Ziyue Yang]

Currently the kdump_setup_ifname function would not add
'kdump-' prefix to ssh target specified in link local ipv6
cases, causing ssh dumping failed.

This commit makes kdump_setup_ifname add 'kdump-' prefix to
the ssh target specified in kdump.conf in link local ipv6
address cases.

Signed-off-by: Ziyue Yang 
---
 dracut-module-setup.sh | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index 70fd572..75ca395 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -167,6 +167,7 @@ kdump_setup_ifname() {
     # 'kdump-' is already persistent, this should be fine.
     if [[ $1 =~ eth* ]] && [[ ! $1 =~ ^kdump-* ]]; then
         _ifname="kdump-$1"
+        kdump_setup_ipv6_link_local_ifname "ssh" $1 $_ifname
     else
         _ifname="$1"
     fi
@@ -174,6 +175,32 @@ kdump_setup_ifname() {
     echo "$_ifname"
 }

+# Set ifname in network dumping targets to a specified one
+# in link local ipv6 cases
+# $1: kdump.conf's config item name
+# $2: interface name to change
+# $3: interface name to assign
+kdump_setup_ipv6_link_local_ifname()
+{
+    local _config_item=$1
+    local _ifname=$2
+    local _new_ifname=$3
+
+    local _target=$(get_option_value $_config_item)
+    [[ -n $_target ]] && {
+        local _host=$(get_remote_host $_target)
+        if is_ipv6_link_local "$_host"; then
+            local _target_prefix=${_target%%*}
+            local _target_postfix=${_target##*%}
+            if [[ $_target_postfix == $_ifname ]]; then
+                _new_target="$_target_prefix%$_new_ifname"
+                sed -i "/^$_config_item\ /d" ${initdir}/tmp/$$-kdump.conf
+                echo "$_config_item $_new_target" >> ${initdir}/tmp/$$-kdump.conf
+            fi
+        fi
+    }
+}
+
 kdump_setup_bridge() {
     local _netdev=$1
     local _brif _dev _mac _kdumpdev