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Prompt user to unlock when login from dropbear

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Update the zfsunlock initramfs hook to provide instructions on how
to unlock the root filesystem when appropriate.  The intent is to
make the dropbear ssh MOTD more user friendly.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Cong Zhang <13283869+congzhangzh@users.noreply.github.com>
Closes #17661
Closes #17662
This commit is contained in:
Cong Zhang 2025-08-23 04:11:41 +08:00 committed by Brian Behlendorf
parent 00dfa094ac
commit e3392a5e7d
1 changed files with 9 additions and 0 deletions
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9
contrib/initramfs/hooks/zfsunlock.in
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@ -8,3 +8,12 @@ fi
. /usr/share/initramfs-tools/hook-functions
copy_exec /usr/share/initramfs-tools/zfsunlock /usr/bin/zfsunlock
if [ -f /etc/initramfs-tools/etc/motd ]; then
copy_file text /etc/initramfs-tools/etc/motd /etc/motd
else
tmpf=$(mktemp)
echo "If you use zfs encrypted root filesystems, you can use \`zfsunlock\` to manually unlock it" > "$tmpf"
copy_file text "$tmpf" /etc/motd
rm -f "$tmpf"
fi