[PATCH] fix the error of parsing the container environ variable for osbuild

[Coiby Xu]

The environment variable entries in /proc/[pid]/environ are separated by
null bytes instead of by spaces. Update the sed regex to fix this issue.

Note this patch also fixes a issue which is kdumpctl would try to reset
crashkernel even osbuild has provided custom crashkernel value.

Fixes: ddd428a ("set up kernel crashkernel for osbuild in kernel hook")
Signed-off-by: Coiby Xu <coxu(a)redhat.com&gt;
---
 kdumpctl | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/kdumpctl b/kdumpctl
index 8107487..b32fac0 100755
--- a/kdumpctl
+++ b/kdumpctl
@@ -1578,7 +1578,7 @@ reset_crashkernel_after_update()
 
 _is_osbuild()
 {
-	[[ $(sed -n -E 's/.*(^|\s)container=(\S*).*/\2/p' < /proc/1/environ) ==
bwrap-osbuild ]]
+	[[ $(sed -n -E 's/.*(^|\x00)container=([^\x00]*).*/\2/p' < /proc/1/environ)
== bwrap-osbuild ]]
 }
 
 reset_crashkernel_for_installed_kernel()
@@ -1590,8 +1590,10 @@ reset_crashkernel_for_installed_kernel()
 		exit 1
 	fi
 
-	if _is_osbuild && ! grep -qs crashkernel= /etc/kernel/cmdline; then
-		reset_crashkernel "--kernel=$_installed_kernel"
+	if _is_osbuild; then
+		if ! grep -qs crashkernel= /etc/kernel/cmdline; then
+			reset_crashkernel "--kernel=$_installed_kernel"
+		fi
 		return
 	fi
 
-- 
2.31.1