147 lines
3.9 KiB
Bash
147 lines
3.9 KiB
Bash
#! /bin/bash
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#
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# This script contains all the fixups run when systemd-container package is
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# installed or updated.
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#
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warn() {
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echo >&2 "warning: $@"
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}
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is_btrfs_subvolume() {
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# On btrfs subvolumes always have the inode 256
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test $(stat --format=%i "$1") -eq 256
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}
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# This assumes the directory/subvol is emptied by the caller.
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rm_subvolume_or_directory() {
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is_btrfs_subvolume "$1" && {
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btrfs subvolume delete "$1"
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return
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}
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rmdir "$1"
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}
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# On systems using BTRFS, convert /var/lib/machines into a subvolume suitable
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# for snapper to perform snapshots, rollbacks.. in case it was not properly set
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# up, see bsc#992573. The installer has been fixed to properly initialize it at
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# installation time.
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#
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# The conversion might only be problematic for openSUSE distros (TW/Factory)
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# where the subvolume was created at the wrong place (via tmpfiles for example)
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# and it got populated before we had time to fix it. In this case we'll let the
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# user fix it manually.
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#
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# On SLE12 this subvolume was only introduced during the upgrade from v210 to
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# v228 (ie SLE12-SP[01] -> SLE12-SP2+ when we added this workaround hence no
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# user should had time to populate it. Note that the subvolume is still created
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# at the wrong place due to the call to tmpfiles_create macro in the %post
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# section however it's empty so again we shouldn't face any issue to convert it.
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#
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# In order to avoid ugly dependencies added in systemd package, this function
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# should only be called during package updates when mksubvolume(8) is
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# available. During installation, /var/lib/machines is supposed to be created by
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# the installer now.
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#
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# See bsc#992573
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#
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fix_machines_subvol() {
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local tagfile=/var/lib/systemd/rpm/container-machines_subvol
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if [ -e $tagfile ]; then
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return 0
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fi
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touch $tagfile
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#
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# If there's already an entry in fstab for /var/lib/machines, it
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# means that:
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#
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# - the installer initialized /var/lib/machines correctly (default)
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# - we already fixed it
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# - the sysadmin added it manually
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#
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# In any cases we should return.
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#
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# Note: we can't simply check if /var/lib/machines has been mounted
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# because an update through a chroot might be in progress (see
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# bsc#1030290).
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#
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if mount --fake /var/lib/machines 2>/dev/null; then
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return
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fi
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#
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# If there is already an entry in fstab for /var, it means that:
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#
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# - the system has a seperate /var subvolume (default from Feb 2018)
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# - the system has a seperate /var partition
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#
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# In any case we should return.
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#
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if mount --fake /var 2>/dev/null; then
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return
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fi
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#
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# If something is already mounted don't try to fix anything, it's been
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# done manually by the sysadmin.
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#
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if mountpoint -q /var/lib/machines; then
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return
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fi
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#
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# Let's try to figure out if the current filesystem uses a Snapper
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# BTRFS specific layout. Note that TW uses a different layout than
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# SLE...
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#
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# FIXME: not sure if it's correct, reliable or optimal.
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#
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case $(findmnt -nr -t btrfs -o FSROOT / 2>/dev/null) in
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*.snapshots/*/snapshot*)
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;;
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*)
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return 0
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esac
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if test -d /var/lib/machines; then
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#
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# Ok, we're on a system supporting rollbacks and
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# /var/lib/machines is not a subvolume remotely mounted so it
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# cannot be suitable for systems supporting rollback. Fix it.
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#
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echo "Making /var/lib/machines suitable for rollbacks..."
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type mksubvolume >/dev/null 2>&1 || {
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warn "mksubvolume(8) is not installed, aborting."
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return 1
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}
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test "$(ls -A /var/lib/machines/)" && {
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warn "/var/lib/machines is not empty, aborting."
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return 1
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}
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echo "Deleting empty /var/lib/machines directory/subvolume"
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rm_subvolume_or_directory /var/lib/machines || {
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warn "fail to delete /var/lib/machines"
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return 1
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}
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fi
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# At this point /var/lib/machines shouldn't exist.
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echo "Creating /var/lib/machines subvolume suitable for rollbacks."
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mksubvolume /var/lib/machines
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}
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r=0
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if [ $1 -gt 1 ]; then
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# During upgrade
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fix_machines_subvol || {
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warn "Please fix /var/lib/machines manually."
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r=1
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}
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fi
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exit $r
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