mandos premount script needs setsid which is not in initrd

[Christian Rusa]

The last lines of /usr/share/initramfs-tools/scripts/init-premount/mandos are
elif [ -x /usr/bin/cryptroot-unlock ]; then
    setsid /lib/mandos/mandos-to-cryptroot-unlock &
fi

As setsid is not present in the initramfs this premount script fails.

Tested on a fresh install of 20.04.

Workaround to solve this problem was to create a hook in /etc/initramfs-tools/hooks/
which simply does
cp -a /usr/bin/setsid $DESTDIR/bin/setsid

PS: Package was mandos-client not mandos (server), but form states - "mandos-client" does not exist in Ubuntu

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: mandos-client 1.8.9-2
ProcVersionSignature: Ubuntu 5.4.0-74.83-generic 5.4.114
Uname: Linux 5.4.0-74-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
Date: Tue Jun 8 18:53:16 2021
SourcePackage: mandos
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.mandos.plugin-runner.conf: [modified]
mtime.conffile..etc.mandos.plugin-runner.conf: 2021-06-08T18:19:25.887512

[Mandos Maintainers (mandos-maintainers)]

This was fixed in Mandos 1.8.12 (released eleven months ago).

[Christian Rusa (ehristian)]

ubuntu 20.04 uses version 1.8.9.
Any plans to backport this fix?

Looks like it should be easy:

- setsid /lib/mandos/mandos-to-cryptroot-unlock &
+ # Use setsid if available
+ if command -v setsid >/dev/null 2>&1; then
+ setsid /lib/mandos/mandos-to-cryptroot-unlock &
+ else
+ /lib/mandos/mandos-to-cryptroot-unlock &
+ fi

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.