mkosi: Unmount /etc/resolv.conf if it's a mountpoint

diff --git a/mkosi.presets/20-final/mkosi.postinst b/mkosi.presets/20-final/mkosi.postinst
index 3f3a78e906333372864259a00649d0af29696bb1..663fa5c762e30b98c2e3104a2702d3b53cdf8223 100755 (executable)
--- a/mkosi.presets/20-final/mkosi.postinst
+++ b/mkosi.presets/20-final/mkosi.postinst
@@ -76,7 +76,9 @@ if command -v authselect >/dev/null; then
     fi
 fi
 
-# Let tmpfiles.d/systemd-resolve.conf handle the symlink
+# Let tmpfiles.d/systemd-resolve.conf handle the symlink. /etc/resolv.conf might be mounted over so undo that
+# if that's the case.
+mountpoint -q /etc/resolv.conf && umount /etc/resolv.conf
 rm -f /etc/resolv.conf
 
 . /usr/lib/os-release