feat(crypt): force the inclusion of crypttab entries with x-initrd.attach

dracut has a "hidden" and undocumented `force` crypttab option (added with
commit b7058d0ce5e99cbc80b5f760a0b654d3ff03c094). This option forces the
inclusion of a crypttab entry in the initrd, which is useful in some cases where
the filesystem check (for whatever reason) does not report a required encrypted
device as "crypto_LUKS".

On the other hand, systemd provides the `x-initrd.attach` crypttab option since
v245. Excerpt from `crypttab(5)`:

```
x-initrd.attach

Setup this encrypted block device in the initrd, similarly to systemd.mount(5)
units marked with x-initrd.mount.
```

This crypttab option is commonly used to mark encrypted block devices that
contain filesystems mounted in the initrd. So, this patch aims to make use of
this well-known systemd crypttab option to match the functionality provided by
the not so well-known dracut crypttab option.

diff --git a/modules.d/90crypt/module-setup.sh b/modules.d/90crypt/module-setup.sh
index 8d24825ca3d3714a415ef96ca97554ffff017eb8..cc74077bf6179370b6da52625cd73d0c6445ce41 100755 (executable)
--- a/modules.d/90crypt/module-setup.sh
+++ b/modules.d/90crypt/module-setup.sh
@@ -118,7 +118,7 @@ install() {
             forceentry=""
             while [ $# -gt 0 ]; do
                 case $1 in
-                    force)
+                    force | x-initrd.attach)
                         forceentry="yes"
                         break
                         ;;