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Linux altar53.supremepanel53.com 4.18.0-553.8.1.lve.el8.x86_64 #1 SMP Thu Jul 4 16:24:39 UTC 2024 x86_64
/ usr/ lib/ dracut/ modules.d/ 90dmsquash-live/ |
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#!/bin/sh
type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
command -v unpack_archive >/dev/null || . /lib/img-lib.sh
PATH=/usr/sbin:/usr/bin:/sbin:/bin
if getargbool 0 rd.live.debug -n -y rdlivedebug; then
exec > /tmp/liveroot.$$.out
exec 2>> /tmp/liveroot.$$.out
set -x
fi
[ -z "$1" ] && exit 1
livedev="$1"
# parse various live image specific options that make sense to be
# specified as their own things
live_dir=$(getarg rd.live.dir -d live_dir)
[ -z "$live_dir" ] && live_dir="LiveOS"
squash_image=$(getarg rd.live.squashimg)
[ -z "$squash_image" ] && squash_image="squashfs.img"
getargbool 0 rd.live.ram -d -y live_ram && live_ram="yes"
getargbool 0 rd.live.overlay.reset -d -y reset_overlay && reset_overlay="yes"
getargbool 0 rd.live.overlay.readonly -d -y readonly_overlay && readonly_overlay="--readonly" || readonly_overlay=""
overlay=$(getarg rd.live.overlay -d overlay)
getargbool 0 rd.writable.fsimg -d -y writable_fsimg && writable_fsimg="yes"
overlay_size=$(getarg rd.live.overlay.size=)
[ -z "$overlay_size" ] && overlay_size=32768
getargbool 0 rd.live.overlay.thin && thin_snapshot="yes"
getargbool 0 rd.live.overlay.overlayfs && overlayfs="yes"
# CD/DVD media check
[ -b $livedev ] && fs=$(blkid -s TYPE -o value $livedev)
if [ "$fs" = "iso9660" -o "$fs" = "udf" ]; then
check="yes"
fi
getarg rd.live.check -d check || check=""
if [ -n "$check" ]; then
type plymouth >/dev/null 2>&1 && plymouth --hide-splash
if [ -n "$DRACUT_SYSTEMD" ]; then
p=$(dev_unit_name "$livedev")
systemctl start checkisomd5@${p}.service
else
checkisomd5 --verbose $livedev
fi
if [ $? -eq 1 ]; then
die "CD check failed!"
exit 1
fi
type plymouth >/dev/null 2>&1 && plymouth --show-splash
fi
ln -s $livedev /run/initramfs/livedev
# determine filesystem type for a filesystem image
det_img_fs() {
udevadm settle >&2
blkid -s TYPE -u noraid -o value "$1"
}
modprobe squashfs
CMDLINE=$(getcmdline)
for arg in $CMDLINE; do case $arg in ro|rw) liverw=$arg ;; esac; done
# mount the backing of the live image first
mkdir -m 0755 -p /run/initramfs/live
if [ -f $livedev ]; then
# no mount needed - we've already got the LiveOS image in initramfs
# check filesystem type and handle accordingly
fstype=$(det_img_fs $livedev)
case $fstype in
squashfs) SQUASHED=$livedev;;
auto) die "cannot mount live image (unknown filesystem type)" ;;
*) FSIMG=$livedev ;;
esac
[ -e /sys/fs/$fstype ] || modprobe $fstype
else
if [ "$(blkid -o value -s TYPE $livedev)" != "ntfs" ]; then
mount -n -t $fstype -o ${liverw:-ro} $livedev /run/initramfs/live
else
# Symlinking /usr/bin/ntfs-3g as /sbin/mount.ntfs seems to boot
# at the first glance, but ends with lots and lots of squashfs
# errors, because systemd attempts to kill the ntfs-3g process?!
if [ -x "/usr/bin/ntfs-3g" ]; then
( exec -a @ntfs-3g ntfs-3g -o ${liverw:-ro} $livedev /run/initramfs/live ) | vwarn
else
die "Failed to mount block device of live image: Missing NTFS support"
exit 1
fi
fi
if [ "$?" != "0" ]; then
die "Failed to mount block device of live image"
exit 1
fi
fi
# overlay setup helper function
do_live_overlay() {
# create a sparse file for the overlay
# overlay: if non-ram overlay searching is desired, do it,
# otherwise, create traditional overlay in ram
l=$(blkid -s LABEL -o value $livedev) || l=""
u=$(blkid -s UUID -o value $livedev) || u=""
if [ -z "$overlay" ]; then
pathspec="/${live_dir}/overlay-$l-$u"
elif strstr $overlay ":"; then
# pathspec specified, extract
pathspec=${overlay##*:}
fi
if [ -z "$pathspec" -o "$pathspec" = "auto" ]; then
pathspec="/${live_dir}/overlay-$l-$u"
fi
devspec=${overlay%%:*}
# need to know where to look for the overlay
if [ -z "$setup" -a -n "$devspec" -a -n "$pathspec" -a -n "$overlay" ]; then
mkdir -m 0755 /run/initramfs/overlayfs
opt=''
[ -n "$readonly_overlay" ] && opt=-r
mount -n -t auto $devspec /run/initramfs/overlayfs || :
if [ -f /run/initramfs/overlayfs$pathspec -a -w /run/initramfs/overlayfs$pathspec ]; then
OVERLAY_LOOPDEV=$(losetup -f --show $opt /run/initramfs/overlayfs$pathspec)
over=$OVERLAY_LOOPDEV
umount -l /run/initramfs/overlayfs || :
oltype=$(det_img_fs $OVERLAY_LOOPDEV)
if [ -z "$oltype" ] || [ "$oltype" = DM_snapshot_cow ]; then
if [ -n "$reset_overlay" ]; then
info "Resetting the Device-mapper overlay."
dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1 conv=fsync 2>/dev/null
fi
if [ -n "$overlayfs" ]; then
unset -v overlayfs
[ -n "$DRACUT_SYSTEMD" ] && reloadsysrootmountunit=":>/xor_overlayfs;"
fi
setup="yes"
else
mount -n -t $oltype $opt $OVERLAY_LOOPDEV /run/initramfs/overlayfs
if [ -d /run/initramfs/overlayfs/overlayfs ] &&
[ -d /run/initramfs/overlayfs/ovlwork ]; then
ln -s /run/initramfs/overlayfs/overlayfs /run/overlayfs$opt
ln -s /run/initramfs/overlayfs/ovlwork /run/ovlwork$opt
if [ -z "$overlayfs" ] && [ -n "$DRACUT_SYSTEMD" ]; then
reloadsysrootmountunit=":>/xor_overlayfs;"
fi
overlayfs="required"
setup="yes"
fi
fi
elif [ -d /run/initramfs/overlayfs$pathspec ] &&
[ -d /run/initramfs/overlayfs$pathspec/../ovlwork ]; then
ln -s /run/initramfs/overlayfs$pathspec /run/overlayfs$opt
ln -s /run/initramfs/overlayfs$pathspec/../ovlwork /run/ovlwork$opt
if [ -z "$overlayfs" ] && [ -n "$DRACUT_SYSTEMD" ]; then
reloadsysrootmountunit=":>/xor_overlayfs;"
fi
overlayfs="required"
setup="yes"
fi
fi
if [ -n "$overlayfs" ]; then
modprobe overlay
if [ $? != 0 ]; then
if [ "$overlayfs" = required ]; then
die "OverlayFS is required but not available."
exit 1
fi
[ -n "$DRACUT_SYSTEMD" ] && reloadsysrootmountunit=":>/xor_overlayfs;"
m='OverlayFS is not available; using temporary Device-mapper overlay.'
info $m
unset -v overlayfs setup
fi
fi
if [ -z "$setup" -o -n "$readonly_overlay" ]; then
if [ -n "$setup" ]; then
warn "Using temporary overlay."
elif [ -n "$devspec" -a -n "$pathspec" ]; then
[ -z "$m" ] &&
m=' Unable to find a persistent overlay; using a temporary one.'
m="$m"$'\n All root filesystem changes will be lost on shutdown.'
m="$m"$'\n Press [Enter] to continue.'
printf "\n\n\n\n${m}\n\n\n" > /dev/kmsg
if [ -n "$DRACUT_SYSTEMD" ]; then
if type plymouth >/dev/null 2>&1 && plymouth --ping ; then
if getargbool 0 rhgb || getargbool 0 splash ; then
m='>>>'$'\n''>>>'$'\n''>>>'$'\n\n\n'"$m"
m="${m%n.*}"$'n.\n\n\n''<<<'$'\n''<<<'$'\n''<<<'
plymouth display-message --text="${m}"
else
plymouth ask-question --prompt="${m}" --command=true
fi
else
m=">>>${m//.[[:space:]]/.} <<<"
systemd-ask-password --timeout=0 "${m}"
fi
else
type plymouth >/dev/null 2>&1 && plymouth --ping && plymouth --quit
read -s -r -p $'\n\n'"${m}" -n 1 reply
fi
fi
if [ -n "$overlayfs" ]; then
mkdir -m 0755 /run/overlayfs
mkdir -m 0755 /run/ovlwork
if [ -n "$readonly_overlay" ] && ! [ -h /run/overlayfs-r ]; then
info "No persistent overlay found."
unset -v readonly_overlay
[ -n "$DRACUT_SYSTEMD" ] && reloadsysrootmountunit="${reloadsysrootmountunit}:>/xor_readonly;"
fi
else
dd if=/dev/null of=/overlay bs=1024 count=1 seek=$((overlay_size*1024)) 2> /dev/null
if [ -n "$setup" -a -n "$readonly_overlay" ]; then
RO_OVERLAY_LOOPDEV=$(losetup -f --show /overlay)
over=$RO_OVERLAY_LOOPDEV
else
OVERLAY_LOOPDEV=$(losetup -f --show /overlay)
over=$OVERLAY_LOOPDEV
fi
fi
fi
# set up the snapshot
if [ -z "$overlayfs" ]; then
if [ -n "$readonly_overlay" ] && [ -n "$OVERLAY_LOOPDEV" ]; then
echo 0 $sz snapshot $BASE_LOOPDEV $OVERLAY_LOOPDEV P 8 | dmsetup create --readonly live-ro
base="/dev/mapper/live-ro"
else
base=$BASE_LOOPDEV
fi
fi
if [ -n "$thin_snapshot" ]; then
modprobe dm_thin_pool
mkdir -m 0755 /run/initramfs/thin-overlay
# In block units (512b)
thin_data_sz=$(( $overlay_size * 1024 * 1024 / 512 ))
thin_meta_sz=$(( $thin_data_sz / 10 ))
# It is important to have the backing file on a tmpfs
# this is needed to let the loopdevice support TRIM
dd if=/dev/null of=/run/initramfs/thin-overlay/meta bs=1b count=1 seek=$((thin_meta_sz)) 2> /dev/null
dd if=/dev/null of=/run/initramfs/thin-overlay/data bs=1b count=1 seek=$((thin_data_sz)) 2> /dev/null
THIN_META_LOOPDEV=$( losetup --show -f /run/initramfs/thin-overlay/meta )
THIN_DATA_LOOPDEV=$( losetup --show -f /run/initramfs/thin-overlay/data )
echo 0 $thin_data_sz thin-pool $THIN_META_LOOPDEV $THIN_DATA_LOOPDEV 1024 1024 | dmsetup create live-overlay-pool
dmsetup message /dev/mapper/live-overlay-pool 0 "create_thin 0"
# Create a snapshot of the base image
echo 0 $sz thin /dev/mapper/live-overlay-pool 0 $base | dmsetup create live-rw
elif [ -z "$overlayfs" ]; then
echo 0 $sz snapshot $base $over PO 8 | dmsetup create live-rw
fi
# Create a device for the ro base of overlayed file systems.
if [ -z "$overlayfs" ]; then
echo 0 $sz linear $BASE_LOOPDEV 0 | dmsetup create --readonly live-base
fi
ln -s $BASE_LOOPDEV /dev/live-base
}
# end do_live_overlay()
# we might have a genMinInstDelta delta file for anaconda to take advantage of
if [ -e /run/initramfs/live/${live_dir}/osmin.img ]; then
OSMINSQFS=/run/initramfs/live/${live_dir}/osmin.img
# decompress the delta data
dd if=$OSMINSQFS of=/run/initramfs/osmin.img 2> /dev/null
OSMIN_SQUASHED_LOOPDEV=$( losetup -f )
losetup -r $OSMIN_SQUASHED_LOOPDEV /run/initramfs/osmin.img
mkdir -m 0755 -p /run/initramfs/squashfs.osmin
mount -n -t squashfs -o ro $OSMIN_SQUASHED_LOOPDEV /run/initramfs/squashfs.osmin
OSMIN_LOOPDEV=$( losetup -f )
losetup -r $OSMIN_LOOPDEV /run/initramfs/squashfs.osmin/osmin
umount -l /run/initramfs/squashfs.osmin
fi
# we might have an embedded fs image on squashfs (compressed live)
if [ -e /run/initramfs/live/${live_dir}/${squash_image} ]; then
SQUASHED="/run/initramfs/live/${live_dir}/${squash_image}"
fi
if [ -e "$SQUASHED" ]; then
if [ -n "$live_ram" ]; then
echo 'Copying live image to RAM...' > /dev/kmsg
echo ' (this may take a minute)' > /dev/kmsg
dd if=$SQUASHED of=/run/initramfs/squashed.img bs=512 2> /dev/null
echo 'Done copying live image to RAM.' > /dev/kmsg
SQUASHED="/run/initramfs/squashed.img"
fi
SQUASHED_LOOPDEV=$( losetup -f )
losetup -r $SQUASHED_LOOPDEV $SQUASHED
mkdir -m 0755 -p /run/initramfs/squashfs
mount -n -t squashfs -o ro $SQUASHED_LOOPDEV /run/initramfs/squashfs
if [ -d /run/initramfs/squashfs/LiveOS ]; then
if [ -f /run/initramfs/squashfs/LiveOS/rootfs.img ]; then
FSIMG="/run/initramfs/squashfs/LiveOS/rootfs.img"
elif [ -f /run/initramfs/squashfs/LiveOS/ext3fs.img ]; then
FSIMG="/run/initramfs/squashfs/LiveOS/ext3fs.img"
fi
elif [ -d /run/initramfs/squashfs/proc ]; then
FSIMG=$SQUASHED
if [ -z "$overlayfs" ] && [ -n "$DRACUT_SYSTEMD" ]; then
reloadsysrootmountunit=":>/xor_overlayfs;"
fi
overlayfs="required"
else
die "Failed to find a root filesystem in $SQUASHED."
exit 1
fi
else
# we might have an embedded fs image to use as rootfs (uncompressed live)
if [ -e /run/initramfs/live/${live_dir}/rootfs.img ]; then
FSIMG="/run/initramfs/live/${live_dir}/rootfs.img"
elif [ -e /run/initramfs/live/${live_dir}/ext3fs.img ]; then
FSIMG="/run/initramfs/live/${live_dir}/ext3fs.img"
fi
if [ -n "$live_ram" ]; then
echo 'Copying live image to RAM...' > /dev/kmsg
echo ' (this may take a minute or so)' > /dev/kmsg
dd if=$FSIMG of=/run/initramfs/rootfs.img bs=512 2> /dev/null
echo 'Done copying live image to RAM.' > /dev/kmsg
FSIMG='/run/initramfs/rootfs.img'
fi
fi
if [ -n "$FSIMG" ]; then
if [ -n "$writable_fsimg" ]; then
# mount the provided filesystem read/write
echo "Unpacking live filesystem (may take some time)" > /dev/kmsg
mkdir -m 0755 /run/initramfs/fsimg/
if [ -n "$SQUASHED" ]; then
cp -v $FSIMG /run/initramfs/fsimg/rootfs.img
else
unpack_archive $FSIMG /run/initramfs/fsimg/
fi
FSIMG=/run/initramfs/fsimg/rootfs.img
fi
opt=-r
# For writable DM images...
if [ -z "$SQUASHED" -a -n "$live_ram" -a -z "$overlayfs" ] ||
[ -n "$writable_fsimg" ] ||
[ "$overlay" = none -o "$overlay" = None -o "$overlay" = NONE ]; then
if [ -z "$readonly_overlay" ]; then
opt=''
setup=rw
else
setup=yes
fi
fi
if [ "$FSIMG" = "$SQUASHED" ]; then
BASE_LOOPDEV=$SQUASHED_LOOPDEV
else
BASE_LOOPDEV=$(losetup -f --show $opt $FSIMG)
sz=$(blockdev --getsz $BASE_LOOPDEV)
fi
if [ "$setup" = rw ]; then
echo 0 $sz linear $BASE_LOOPDEV 0 | dmsetup create live-rw
else
# Add a DM snapshot or OverlayFS for writes.
do_live_overlay
fi
fi
if [ -b "$OSMIN_LOOPDEV" ]; then
# set up the devicemapper snapshot device, which will merge
# the normal live fs image, and the delta, into a minimzied fs image
echo "0 $sz snapshot $BASE_LOOPDEV $OSMIN_LOOPDEV P 8" | dmsetup create --readonly live-osimg-min
fi
if [ -n "$reloadsysrootmountunit" ]; then
eval "$reloadsysrootmountunit"
systemctl daemon-reload
fi
ROOTFLAGS="$(getarg rootflags)"
if [ -n "$overlayfs" ]; then
mkdir -m 0755 /run/rootfsbase
if [ -n "$reset_overlay" ] && [ -h /run/overlayfs ]; then
ovlfs=$(readlink /run/overlayfs)
info "Resetting the OverlayFS overlay directory."
rm -r -- ${ovlfs}/* ${ovlfs}/.* >/dev/null 2>&1
fi
if [ -n "$readonly_overlay" ] && [ -h /run/overlayfs-r ]; then
ovlfs=lowerdir=/run/overlayfs-r:/run/rootfsbase
else
ovlfs=lowerdir=/run/rootfsbase
fi
mount -r $FSIMG /run/rootfsbase
if [ -z "$DRACUT_SYSTEMD" ]; then
printf 'mount -t overlay LiveOS_rootfs -o%s,%s %s\n' "$ROOTFLAGS" \
"$ovlfs",upperdir=/run/overlayfs,workdir=/run/ovlwork \
"$NEWROOT" > $hookdir/mount/01-$$-live.sh
fi
else
if [ -z "$DRACUT_SYSTEMD" ]; then
[ -n "$ROOTFLAGS" ] && ROOTFLAGS="-o $ROOTFLAGS"
printf 'mount %s /dev/mapper/live-rw %s\n' "$ROOTFLAGS" "$NEWROOT" > $hookdir/mount/01-$$-live.sh
fi
fi
[ -e "$SQUASHED" ] && umount -l /run/initramfs/squashfs
ln -s null /dev/root
need_shutdown
exit 0