mirror of
https://git.proxmox.com/git/mirror_spl-debian
synced 2025-08-16 17:04:33 +00:00
c932eac93e
There are packages distributed with /etc/hostid file installed as conffile, which is going to cause problem when the package is purged. Here we detect such case and migrate it to an ordinary file that preserves during purge. Also replace the endianness detection code to use od(1) from coreutils instead of requiring gcc
50 lines
2.0 KiB
Bash
50 lines
2.0 KiB
Bash
#!/bin/sh
|
|
set -e
|
|
# The hostname and hostid of the last system to access a ZFS pool are stored in
|
|
# the ZFS pool itself. A pool is foreign if, during `zpool import`, the
|
|
# current hostname and hostid are different than the stored values thereof.
|
|
#
|
|
# The hostid on Solaris is intrinsic, but is not on Linux (see #595790), so the
|
|
# spl kernel module invokes /usr/bin/hostid from the userland in its initialization
|
|
# routine.
|
|
#
|
|
# /usr/bin/hostid will return the 4 first bytes of the file /etc/hostid.
|
|
# If this file is not present or contains less than 4 bytes, then /usr/bin/hostid
|
|
# will return the bytes of the IP address of $(hostname) flipped, or zero if
|
|
# such IP couldn't be obtained
|
|
#
|
|
# This means that things like a DHCP lease change can affect the hostid.
|
|
#
|
|
# Therefore the only way of having a stable hostid is to define it on /etc/hostid.
|
|
# This postinst helper will check if we already have the hostid stabilized by
|
|
# checking the existence of the file /etc/hostid to be 4 bytes at least.
|
|
# If this file don't already exists on our system or has less than 4 bytes, then
|
|
# we will stabilize our current hostid by writing its value to /etc/hostid
|
|
|
|
# Detect if /etc/hostid is a conffile of previous spl package, migrate if yes
|
|
# hostid file should preserve even when package is purged
|
|
if $(dpkg-query --showformat='${Conffiles}\n' --show spl >/dev/null 2>&1); then
|
|
dpkg-maintscript-helper rm_conffile /etc/hostid -- "$@"
|
|
fi
|
|
|
|
if [ ! -f /etc/hostid ] || [ $(stat -c %s /etc/hostid) -lt 4 ] ; then
|
|
|
|
# Write our current hostid to /etc/hostid
|
|
HOSTID=$(hostid)
|
|
AA=$(echo $HOSTID | cut -b 1,2)
|
|
BB=$(echo $HOSTID | cut -b 3,4)
|
|
CC=$(echo $HOSTID | cut -b 5,6)
|
|
DD=$(echo $HOSTID | cut -b 7,8)
|
|
|
|
# Big Endian
|
|
if [ $(echo -n I | od -to2 | awk 'FNR==1{ print substr($2,6,1)}' 2>/dev/null) = 0 ]; then
|
|
# Invoke the printf from coreutils. shell builtin lacks the byte format.
|
|
/usr/bin/printf "\x$AA\x$BB\x$CC\x$DD" >/etc/hostid
|
|
else
|
|
# Little Endian
|
|
/usr/bin/printf "\x$DD\x$CC\x$BB\x$AA" >/etc/hostid
|
|
fi
|
|
fi
|
|
|
|
#DEBHELPER#
|