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config/dracut/90zfs: handle cases where hostid(1) returns all zeros 

On systems with musl libc, hostid(1) always prints "00000000", which
will cause improper behavior when the 90zfs module is configured in a
dracut initramfs. Work around this by copying the host /etc/hostid if
the file exists, and otherwise only write /etc/hostid if hostid(1)
returns something meaningful. This avoids zgenhostid creating a random
/etc/hostid for the initramfs, which could lead to errors when trying to
import the pool if spl_hostid isn't defined in the kernel command line.

Furthermore, tag the /etc/hostid file as hostonly, since it is system
specific and shouldn't be taken into account when trying to use an
initramfs generated in one system to boot into a different system.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Georgy Yakovlev <gyakovlev@gentoo.org>
Co-authored-by: Andrew J. Hesford <ajh@sideband.org>
Signed-off-by: Érico Rolim <erico.erc@gmail.com>
Closes #11174
Closes #11189
This commit is contained in:
Érico Rolim 2020-11-13 00:00:59 -03:00 committed by Brian Behlendorf
parent 9c4b6dbb31
commit 24c12b48a1
1 changed files with 7 additions and 1 deletions
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8
contrib/dracut/90zfs/module-setup.sh.in
View File

@ -85,7 +85,13 @@ install() {
fi
# Synchronize initramfs and system hostid
zgenhostid -o "${initdir}/etc/hostid" "$(hostid)"
if [ -f @sysconfdir@/hostid ]; then
inst @sysconfdir@/hostid
type mark_hostonly >/dev/null 2>&1 && mark_hostonly @sysconfdir@/hostid
elif HOSTID="$(hostid 2>/dev/null)" && [ "${HOSTID}" != "00000000" ]; then
zgenhostid -o "${initdir}@sysconfdir@/hostid" "${HOSTID}"
type mark_hostonly >/dev/null 2>&1 && mark_hostonly @sysconfdir@/hostid
fi
if dracut_module_included "systemd"; then
mkdir -p "${initdir}/$systemdsystemunitdir/zfs-import.target.wants"