test: make passt.mbuto script more robust

[Jon Maloy <jmaloy@redhat.com>]

From: Jon Paul Maloy <jmaloy@redhat.com>

Creation of a symbolic link from /sbin to /usr/sbin fails if /sbin
exists and is non-empty. This is the case on Ubuntu-23.04.

We fix this by removing /sbin before creating the link.

Signed-off-by: Jon Maloy <jmaloy@redhat.com>
---
 test/passt.mbuto | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/passt.mbuto b/test/passt.mbuto
index 90816d2..12d7f50 100755
--- a/test/passt.mbuto
+++ b/test/passt.mbuto
@@ -26,6 +26,8 @@ DIRS="${DIRS} /tmp /sbin /usr/share /var/log /var/lib /etc/ssh /run/sshd /root/.
 COPIES="${COPIES} small.bin,/root/small.bin medium.bin,/root/medium.bin big.bin,/root/big.bin"
 
 FIXUP="${FIXUP}"'
+	rm -rf /sbin
+	ln -s /usr/sbin /sbin
 	cat > /sbin/dhclient-script << EOF
 #!/bin/sh
 LOG=/var/log/dhclient-script.log
@@ -47,7 +49,6 @@ set >> \$LOG
 exit 0
 EOF
 	chmod 755 /sbin/dhclient-script
-	ln -s /sbin /usr/sbin
 	ln -s /bin /usr/bin
 	ln -s /run /var/run
 	:> /etc/fstab
-- 
@@ -26,6 +26,8 @@ DIRS="${DIRS} /tmp /sbin /usr/share /var/log /var/lib /etc/ssh /run/sshd /root/.
 COPIES="${COPIES} small.bin,/root/small.bin medium.bin,/root/medium.bin big.bin,/root/big.bin"
 
 FIXUP="${FIXUP}"'
+	rm -rf /sbin
+	ln -s /usr/sbin /sbin
 	cat > /sbin/dhclient-script << EOF
 #!/bin/sh
 LOG=/var/log/dhclient-script.log
@@ -47,7 +49,6 @@ set >> \$LOG
 exit 0
 EOF
 	chmod 755 /sbin/dhclient-script
-	ln -s /sbin /usr/sbin
 	ln -s /bin /usr/bin
 	ln -s /run /var/run
 	:> /etc/fstab
-- 
2.39.2