Introduce get_kdump_mntpoint_from_target and fix duplicated /

User a helper to get the path to mount dump target in kdump kernel, and
fix duplicated '/' in the mount path problem.

Fixes: bz1785371
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>

kdump-lib.sh

@@ -258,6 +258,25 @@ get_mntpoint_from_target()
     findmnt -k -f -n -r -o TARGET --source $1
 }
 
+# Get the path where the target will be mounted in kdump kernel
+# $1: kdump target device
+get_kdump_mntpoint_from_target()
+{
+    local _mntpoint=$(get_mntpoint_from_target $1)
+
+    # mount under /sysroot if dump to root disk or mount under
+    # /kdumproot/$_mntpoint in other cases in 2nd kernel. systemd
+    # will be in charge to umount it.
+    if [ "$_mntpoint" = "/" ];then
+        _mntpoint="/sysroot"
+    else
+        _mntpoint="/kdumproot/$_mntpoint"
+    fi
+
+    # strip duplicated "/"
+    echo $_mntpoint | tr -s "/"
+}
+
 # get_option_value <option_name>
 # retrieves value of option defined in kdump.conf
 get_option_value() {

kdumpctl

@@ -480,12 +480,7 @@ check_dump_fs_modified()
 		return 2
 	fi
 
-	if [[ "$_target" = "$(get_root_fs_device)" ]]; then
+	_new_mntpoint="$(get_kdump_mntpoint_from_target $_target)"
-		_new_mntpoint="/sysroot"
-	else
-		_new_mntpoint="/kdumproot/$(get_mntpoint_from_target $_target)"
-	fi
-
 	_dracut_args=$(lsinitrd $TARGET_INITRD -f usr/lib/dracut/build-parameter.txt)
 	if [[ -z "$_dracut_args" ]];then
 		echo "Warning: No dracut arguments found in initrd"

mkdumprd

@@ -51,21 +51,12 @@ add_dracut_sshkey() {
 
 # caller should ensure $1 is valid and mounted in 1st kernel
 to_mount() {
-    local _dev=$1 _source _target _fstype _options _mntopts _pdev
+    local _dev=$1 _source _new_mntpoint _fstype _options _mntopts _pdev
 
     _source=$(findmnt -k -f -n -r -o SOURCE $_dev)
-    _target=$(get_mntpoint_from_target $_dev)
-    # mount under /sysroot if dump to root disk or mount under
-    #/kdumproot/$_target in other cases in 2nd kernel. systemd
-    #will be in charge to umount it.
-
-    if [ "$_target" = "/" ];then
-        _target="/sysroot"
-    else
-        _target="/kdumproot/$_target"
-    fi
-
     _fstype=$(findmnt -k -f -n -r -o FSTYPE $_dev)
+    _new_mntpoint=$(get_kdump_mntpoint_from_target $_dev)
+
     [[ -e /etc/fstab ]] && _options=$(findmnt --fstab -f -n -r -o OPTIONS $_dev)
     if [ -z "$_options" ]; then
         _options=$(findmnt -k -f -n -r -o OPTIONS $_dev)
@@ -87,14 +78,13 @@ to_mount() {
     # mount it before kdump starts, this is an attempt to improve robustness
     _options="$_options,nofail,x-systemd.before=initrd-fs.target"
 
-    _mntopts="$_target $_fstype $_options"
+    _mntopts="$_new_mntpoint $_fstype $_options"
-    #for non-nfs _dev converting to use udev persistent name
+    # for non-nfs _dev converting to use udev persistent name
     if [ -b "$_source" ]; then
         _pdev="$(get_persistent_dev $_source)"
         if [ -z "$_pdev" ]; then
             return 1
         fi
-
     else
         _pdev=$_dev
     fi