update-initramfs fails when booted with dracut initrd

[Benjamin Drung]

I created an initrd with dracut and successfully booted with it, but generating an initrd fails then:

```
$ sudo update-initramfs -u
update-initramfs: Generating /boot/initrd.img-6.11.0-8-generic
cryptsetup: WARNING: target 'luks-e1446dc1-f3d2-445f-96aa-09245ebe7bd5' not
    found in /etc/crypttab
W: Couldn't identify type of root file system '/dev/mapper/system_crypt' for fsck hook
```

Booted with an initrd from initramfs-tools:

```
$ mount | grep system_crypt | grep -v snap
/dev/mapper/system_crypt on / type ext4 (rw,relatime,discard,errors=remount-ro)
```

Booted with an initrd from dracut:

```
$ mount | grep " / "
/dev/mapper/luks-e1446dc1-f3d2-445f-96aa-09245ebe7bd5 on / type ext4 (rw,relatime,errors=remount-ro)
```

ProblemType: Bug
DistroRelease: Ubuntu 24.10
Package: initramfs-tools 0.142ubuntu34
ProcVersionSignature: Ubuntu 6.11.0-8.8-generic 6.11.0
Uname: Linux 6.11.0-8-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.30.0-0ubuntu4
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 17 15:14:42 2024
InstallationDate: Installed on 2022-03-09 (953 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
PackageArchitecture: all
SourcePackage: initramfs-tools
UpgradeStatus: Upgraded to oracular on 2024-05-02 (168 days ago)
modified.conffile..etc.apport.crashdb.conf: [modified]
mtime.conffile..etc.apport.crashdb.conf: 2024-09-11T14:06:08.605603

[Benjamin Drung (bdrung)]

/etc/crypttab is not included in the initrd, including this files fixes it.

[Benjamin Drung (bdrung)]

Submitted fix upstream: https://github.com/dracut-ng/dracut-ng/pull/746

[Benjamin Drung (bdrung)]

That bug escalated quickly: I misunderstood the meaning of the `hostonly=false` mode. We want to use `hostonly`, but in a mode that support major hardware changes: https://github.com/dracut-ng/dracut-ng/issues/748

To work around this bug, you can build the initrd in hostonly mode 'sloppy':

```
sudo dracut -H --hostonly-mode=sloppy --force
```