feat(crypt): remove empty /etc/crypttab to allow creating it later

crypt module should not install an empty /etc/crypttab in hostonly mode.

Some distributions ship with an /etc/crypttab without entries (just
with comments). In those distributions installing /etc/crypttab
as part of --install command line option in hostonly mode would not
work as expected.

Fixes: https://github.com/dracut-ng/dracut-ng/issues/1057

diff --git a/modules.d/90crypt/module-setup.sh b/modules.d/90crypt/module-setup.sh
index dd297e5a34b382e8c940600be3fce73aaf253ebf..5d9356b47b662a6664681501d31ff0defbd2ff58 100755 (executable)
--- a/modules.d/90crypt/module-setup.sh
+++ b/modules.d/90crypt/module-setup.sh
@@ -136,7 +136,13 @@ install() {
                 done
             fi
         done < "$dracutsysrootdir"/etc/crypttab > "$initdir"/etc/crypttab
-        mark_hostonly /etc/crypttab
+
+        # Remove empty /etc/crypttab to allow creating it later
+        if [ -s "$initdir"/etc/crypttab ]; then
+            mark_hostonly /etc/crypttab
+        else
+            rm -rf "$initdir"/etc/crypttab
+        fi
     fi
 
     inst_simple "$moddir/crypt-lib.sh" "/lib/dracut-crypt-lib.sh"