[PATCH v3 1/4] Revert "kdump-lib.sh: Remove is_atomic"

[Kairui Song]

Now we need this helper again, for `reset-crashkernel`

This reverts commit ff46cfb19e9bf944a114164e33203b1a532d35f6.
---
 kdump-lib.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kdump-lib.sh b/kdump-lib.sh
index 8e618f8..df0aa02 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -341,6 +341,11 @@ kdump_get_persistent_dev() {
     echo $(get_persistent_dev "$dev")
 }

+is_atomic()
+{
+    grep -q "ostree" /proc/cmdline
+}
+
 is_ipv6_address()
 {
     echo $1 | grep -q ":"