/lib/bilibop/lockfs.sh is in bilibop-lockfs 0.4.23.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# vim: set et sw=4 sts=4 ts=4 fdm=marker fcl=all:
# The bilibop-lockfs functions need those of bilibop-common:
. /lib/bilibop/common.sh
# lock_file() ==============================================================={{{
# What we want is: add a filename to the list of files that have been modified
# by the 'bilibop-lockfs' local-bottom initramfs script.
lock_file() {
${DEBUG} && echo "> lock_file $@" >&2
grep -q "^${1}$" ${BILIBOP_RUNDIR}/lock ||
echo "${1}" >>${BILIBOP_RUNDIR}/lock
}
# ===========================================================================}}}
# remount_ro() =============================================================={{{
# What we want is: remount as readonly the lower branch of an aufs mountpoint
# given as argument.
remount_ro() {
${DEBUG} && echo "> remount_ro $@" >&2
is_aufs_mountpoint -q "${1}" || return 1
mount -o remount,ro $(aufs_readonly_branch "${1}")
}
# ===========================================================================}}}
# remount_rw() =============================================================={{{
# What we want is: remount as writable the lower branch of an aufs mountpoint
# given as argument.
remount_rw() {
${DEBUG} && echo "> remount_rw $@" >&2
is_aufs_mountpoint -q "${1}" || return 1
mount -o remount,rw $(aufs_readonly_branch "${1}")
}
# ===========================================================================}}}
# blockdev_root_subtree() ==================================================={{{
# What we want is: set 'ro' or 'rw' the filesystem and its hosting disk given
# as arguments, and all other devices between them. For example, if the first
# one is a Logical Volume (/dev/dm-3) onto a LUKS partition (/dev/sdb1), this
# will modify settings for /dev/dm-3, /dev/sdb, /dev/dm-0 and /dev/sdb1. The
# main option (--setro or --setrw) must be the first argument, and the disk
# node the last one.
# See also the NOTE in 'set_readonly_lvm_settings()' about why we don't use
# 'lvm lvchange --permission r' to set a LV as readonly.
blockdev_root_subtree() {
${DEBUG} && echo "> blockdev_root_subtree $@" >&2
local dev="${2}"
# Here blockdev must be called two times (give the two arguments in the
# same command line don't work with the busybox's blockdev implementation).
blockdev --set"${1}" "${2}"
blockdev --set"${1}" "${3}"
while true
do
case "${dev##*/}" in
dm-*)
dev="$(parent_device_from_dm ${dev})"
;;
loop*)
dev="$(underlying_device_from_loop "${dev}")"
;;
*)
# If a logical partition has to be locked, lock the
# primary extended partition too. Only for ms-dos
# partition tables.
extended="$(extended_partition "${3}")" ||
return 0
[ $(cat /sys/class/block/${dev##*/}/partition) -gt 4 ] &&
dev="${extended}" ||
return 0
;;
esac
blockdev --set"${1}" "${dev}"
done
}
# ===========================================================================}}}
# get_device_node() ========================================================={{{
# What we want is: output the device node from a given argument of the form
# /dev/*, LABEL=* or UUID=* such as they can be found in fstab. This means
# the LABEL may contain '/' characters that need to be translated to their
# hex value, but cannot contain space characters, as they are not managed by
# fstab parsers (i.e. mount).
get_device_node() {
${DEBUG} && echo "> get_device_node $@" >&2
local symlink
case "${1}" in
${UDEV_ROOT}/*)
symlink="$(echo "${1}" | sed "s,^${UDEV_ROOT},${udev_root},")"
;;
UUID=*)
symlink="${udev_root}/disk/by-uuid/${1#UUID=}"
;;
LABEL=*)
symlink="${udev_root}/disk/by-label/$(echo "${1#LABEL=}" | sed -e 's,/,\\x2f,g')"
;;
esac
if [ -e "${symlink}" ]; then
readlink -f ${symlink}
else
return 1
fi
}
# ===========================================================================}}}
# get_swap_policy() ========================================================={{{
# What we want is: output the policy to apply for swap devices. If it is set in
# bilibop.conf, apply it; otherwise, the fallback depends on the 'removable'
# flag in the sysfs attributes.
get_swap_policy() {
${DEBUG} && echo "> get_swap_policy $@" >&2
case "${BILIBOP_LOCKFS_SWAP_POLICY}" in
soft|hard|noauto|crypt|random)
echo "${BILIBOP_LOCKFS_SWAP_POLICY}"
;;
*)
# If BILIBOP_LOCKFS_SWAP_POLICY is not set to
# a known value, use a heuristic to know what
# to do:
is_removable "${BILIBOP_DISK}" &&
echo "hard" ||
echo "crypt"
;;
esac
}
# ===========================================================================}}}
# is_a_crypt_target() ======================================================={{{
# What we want is: parse /etc/crypttab and if the device (/dev/mapper/*) is
# encountered as being the target, return 0; otherwise, return 1.
is_a_crypt_target() {
${DEBUG} && echo "> is_a_crypt_target $@" >&2
while read TARGET SOURCE KEY_FILE CRYPT_OPTS
do
if [ "${TARGET}" != "${1##*/}" ]
then unset TARGET SOURCE KEY_FILE CRYPT_OPTS
else return 0
fi
done <${CRYPTTAB}
return 1
}
# ===========================================================================}}}
# is_encrypted() ============================================================{{{
# What we want is: know if a mapped device name (/dev/mapper/something) given
# as argument is or will be encrypted with cryptsetup (we don't manage other
# programs such as cryptmount or mount.crypt).
is_encrypted() {
${DEBUG} && echo "> is_encrypted $@" >&2
[ -f "${CRYPTTAB}" ] || return 1
local dev="$(get_device_node "${1}")"
while true
do
case "${dev}" in
${udev_root}/dm-*)
# This may be an encrypted swap device, but also a Logical Volume
# containing a swap filesystem. In the last case, is the Volume
# Group inside an encrypted container?
is_a_crypt_target "$(mapper_name_from_dm_node "${dev}")" && return 0
dev="$(parent_device_from_dm ${dev})"
;;
*)
# This is not an encrypted swap device, or we don't know how to
# manage it.
return 1
;;
esac
done
return 1
}
# ===========================================================================}}}
# is_randomly_encrypted() ==================================================={{{
# What we want is: parse /etc/crypttab and if the device (/dev/mapper/*) is
# encountered as being the target with a random key, return 0; otherwise,
# return 1.
is_randomly_encrypted() {
${DEBUG} && echo "> is_randomly_encrypted $@" >&2
while read TARGET SOURCE KEY_FILE CRYPT_OPTS
do
if [ "${TARGET}" != "${1##*/}" ]
then unset TARGET SOURCE KEY_FILE CRYPT_OPTS
else
case "${KEY_FILE}" in
${UDEV_ROOT}/random|${UDEV_ROOT}/urandom)
return 0
;;
*)
;;
esac
fi
done <${CRYPTTAB}
return 1
}
# ===========================================================================}}}
# apply_swap_policy() ======================================================={{{
# What we want is: modify temporary /etc/fstab and /etc/crypttab by commenting
# swap entries or modifying their options.
apply_swap_policy() {
${DEBUG} && echo "> apply_swap_policy $@" >&2
case "$(get_swap_policy)" in
soft)
# Nothing to do
;;
hard)
sed -i "s|^\s*${1}\s\+none\s\+swap\s.*|${comment}\n#&\n|" ${FSTAB}
CRYPTTAB="${rootmnt}/etc/crypttab"
if is_encrypted "${1}"
then
sed -i "s|^\s*${TARGET}\s\+${SOURCE}.*|${comment}\n#&\n|" ${CRYPTTAB}
lock_file "/etc/crypttab"
fi
;;
noauto)
noauto="${1} none swap noauto 0 0"
sed -i "s|^\s*${1}\s\+none\s\+swap\s.*|${comment}\n#&\n${replace}\n${noauto}\n|" ${FSTAB}
CRYPTTAB="${rootmnt}/etc/crypttab"
if is_encrypted "${1}"
then
noauto="${TARGET} ${SOURCE} ${KEY_FILE} ${CRYPT_OPTS},noauto"
sed -i "s|^\s*${TARGET}\s\+${SOURCE}.*|${comment}\n#&\n${replace}\n${noauto}\n|" ${CRYPTTAB} &&
lock_file "/etc/crypttab"
fi
;;
crypt)
CRYPTTAB="${rootmnt}/etc/crypttab"
is_encrypted "${1}" ||
sed -i "s|^\s*${1}\s\+none\s\+swap\s.*|${comment}\n#&\n|" ${FSTAB}
;;
random)
CRYPTTAB="${rootmnt}/etc/crypttab"
is_randomly_encrypted "${1}" ||
sed -i "s|^\s*${1}\s\+none\s\+swap\s.*|${comment}\n#&\n|" ${FSTAB}
;;
esac
}
# ===========================================================================}}}
# parse_and_modify_fstab() =================================================={{{
# What we want is: modify some entries in /etc/fstab and optionally in
# /etc/crypttab. This should apply only on block devices, and only on those
# that have not been whitelisted in bilibop.conf(5). Replace the fstype by
# 'lockfs', and modify options to remember the original fstype. This will be
# used by the mount.lockfs helper.
parse_and_modify_fstab() {
${DEBUG} && echo "> parse_and_modify_fstab $@" >&2
grep -v '^[[:blank:]]*\(#\|$\)' ${FSTAB} |
while read device mntpnt fstype option dump pass
do
# Due to the pipe (|) before the 'while' loop, we are now in a
# subshell. The variables just previously set (device, mntpnt,
# fstype, option, dump, pass) have no sense outside of this loop.
# Don't use them later (after the 'done').
case "${fstype}" in
swap)
# Special settings for swap devices
apply_swap_policy "${device}"
continue
;;
none|ignore|tmpfs|lockfs)
# Don't modify some entries
continue
;;
esac
# Don't modify the "noauto" mount lines nor the binded mounts:
echo "${option}" | grep -q '\<\(noauto\|r\?bind\)\>' && continue
# Skip what we are sure that it is not a local block device (or a
# local file):
case "${device}" in
UUID=*|LABEL=*|/*)
;;
*)
continue
;;
esac
# Skip locking device if whitelisted by the sysadmin. Three formats
# are accepted: the mountpoint itself, a (symlink to a) device name,
# or a metadata about the filesystem (allowing to use something like
# TYPE=vfat for any mountpoint).
for skip in ${BILIBOP_LOCKFS_WHITELIST}
do
case "${skip}" in
${device}|${mntpnt}|TYPE=${fstype})
[ -f "/etc/lvm/bilibop" ] &&
unlock_logical_volume ${device}
continue 2
;;
esac
done
# For each filesystem to lock, modify the line in fstab. A mount
# helper script will manage it later:
#log_warning_msg "${0##*/}: Preparing to lock: ${mntpnt}."
sed -i "s|^\s*${device}\s\+${mntpnt}\s.*|${comment}\n#&\n${replace}\n${device} ${mntpnt} lockfs fstype=${fstype},${option} ${dump} ${pass}\n|" ${FSTAB}
done
}
# ===========================================================================}}}
# add_lockfs_mount_helper() ================================================={{{
# What we want is: add a mount helper script (or a symlink to it) to an aufs
# mountpoint given as argument (this should be the next root of the system from
# the point of view of the initramfs).
add_lockfs_mount_helper() {
${DEBUG} && echo "> add_lockfs_mount_helper $@" >&2
if [ -x ${1}/lib/bilibop/lockfs_mount_helper ]
then
# lockfs_mount_helper is usable as is, so symlink it:
ln -s /lib/bilibop/lockfs_mount_helper ${1}/sbin/mount.lockfs
elif [ -f ${1}/lib/bilibop/lockfs_mount_helper ]
then
# lockfs_mount_helper is not executable
cp ${1}/lib/bilibop/lockfs_mount_helper ${1}/sbin/mount.lockfs
chmod +x ${1}/sbin/mount.lockfs
else # lockfs_mount_helper is missing. Create a fallback script.
# It will not set an aufs and its lower and upper branches,
# but only recalls 'mount' with valid options.
cat >${1}/sbin/mount.lockfs <<EOF
#!/bin/sh
# THIS IS A FALLBACK; IT DON'T LOCK FS BUT JUST RECALLS /bin/mount WITH VALID FSTYPE AND OPTIONS.
PATH="/bin"
[ "\$(readlink -f /proc/\${PPID}/exe)" = "/bin/mount" ] || exit 3
for opt in \$(IFS=',' ; echo \${4}) ; do
case "\${opt}" in
fstype=*) eval "\${opt}" ;;
*) mntopt="\${mntopt:+\${mntopt},}\${opt}" ;;
esac
done
exec mount \${1} \${2} \${fstype:+-t \${fstype}} \${mntopt:+-o \${mntopt}}
EOF
chmod +x ${1}/sbin/mount.lockfs
fi
lock_file "/sbin/mount.lockfs"
}
# ===========================================================================}}}
# check_mount_lockfs() ======================================================{{{
# What we want is: check if /sbin/mount.lockfs exists in the future root
# filesystem given as argument, and if it is executable. If not, add it.
check_mount_lockfs() {
${DEBUG} && echo "> check_mount_lockfs $@" >&2
if [ -h ${1}/sbin/mount.lockfs ]
then
# /sbin/mount.lockfs already exist and is a symlink.
# Is it absolute or relative ?
helper="$(readlink ${1}/sbin/mount.lockfs)"
case "${helper}" in
/*)
helper="${1}${helper}"
;;
?*)
helper="${1}/sbin/${helper}"
;;
esac
if [ ! -f "${helper}" -o ! -x "${helper}" ]
then
# There is a problem with the target. So, remove the
# symlink and add a new lockfs mount helper.
rm -rf ${1}/sbin/mount.lockfs
add_lockfs_mount_helper "${1}"
fi
elif [ -f ${1}/sbin/mount.lockfs -a -x ${1}/sbin/mount.lockfs ]
then
# This probably means the sysadmin has written its own helper
# program. Don't modify this.
:
else rm -rf ${1}/sbin/mount.lockfs
add_lockfs_mount_helper "${1}"
fi
}
# ===========================================================================}}}
# initialize_lvm_conf() ====================================================={{{
# What we want is: create lvm.conf or modify it if the file itself, or a
# required (for our purpose) section, or a required (for our purpose)
# variable/array is missing.
initialize_lvm_conf() {
${DEBUG} && echo "> initialize_lvm_conf $@" >&2
if [ ! -f "${LVM_CONF}" ]
then
mkdir -p ${LVM_CONF%/*}
cat >${LVM_CONF} <<EOF
# ${LVM_SYSTEM_DIR}/lvm.conf
# Build on the fly by ${0##*/} from the initramfs.
# See lvm.conf(5) and bilibop(7) for details.
devices {
dir = "${1}"
scan = [ "${1}" ]
obtain_device_list_from_udev = 1
filter = [ "a|.*|" ]
global_filter = [ "a|.*|" ]
sysfs_scan = 1
}
global {
locking_type = 1
metadata_read_only = 0
}
activation {
}
EOF
return 0
fi
##
if ! grep -q '^[[:blank:]]*devices[[:blank:]]*{' ${LVM_CONF}
then cat >>${LVM_CONF} <<EOF
# Added on the fly by ${0##*/} from the initramfs.
# See lvm.conf(5) and bilibop(7) for details.
devices {
dir = "${1}"
scan = [ "${1}" ]
obtain_device_list_from_udev = 1
filter = [ "a|.*|" ]
global_filter = [ "a|.*|" ]
sysfs_scan = 1
}
EOF
else
grep -q '^[[:blank:]]*dir[[:blank:]]*=' ${LVM_CONF} ||
sed -i "s;^\s*devices\s*{;&\n dir = \"${1}\"\n;" ${LVM_CONF}
grep -q '^[[:blank:]]*scan[[:blank:]]*=' ${LVM_CONF} ||
sed -i "s;^\s*devices\s*{;&\n scan = [ \"${1}\" ]\n;" ${LVM_CONF}
grep -q '^[[:blank:]]*obtain_device_list_from_udev[[:blank:]]*=' ${LVM_CONF} ||
sed -i 's;^\s*devices\s*{;&\n obtain_device_list_form_udev = 1\n;' ${LVM_CONF}
grep -q '^[[:blank:]]*filter[[:blank:]]*=' ${LVM_CONF} ||
sed -i 's;^\s*devices\s*{;&\n filter = [ "a|.*|" ]\n;' ${LVM_CONF}
grep -q '^[[:blank:]]*global_filter[[:blank:]]*=' ${LVM_CONF} ||
sed -i 's;^\s*devices\s*{;&\n global_filter = [ "a|.*|" ]\n;' ${LVM_CONF}
grep -q '^[[:blank:]]*sysfs_scan[[:blank:]]*=' ${LVM_CONF} ||
sed -i 's;^\s*devices\s*{;&\n sysfs_scan = 1\n;' ${LVM_CONF}
fi
##
if ! grep -q '^[[:blank:]]*global[[:blank:]]*{' ${LVM_CONF}
then cat >>${LVM_CONF} <<EOF
# Added on the fly by ${0##*/} from the initramfs.
# See lvm.conf(5) and bilibop(7) for details.
global {
locking_type = 1
metadata_read_only = 0
}
EOF
else
grep -q '^[[:blank:]]*locking_type[[:blank:]]*=' ${LVM_CONF} ||
sed -i 's;^\s*global\s*{;&\n locking_type = 1\n;' ${LVM_CONF}
grep -q '^[[:blank:]]*metadata_read_only[[:blank:]]*=' ${LVM_CONF} ||
sed -i 's;^\s*global\s*{;&\n metadata_read_only = 0\n;' ${LVM_CONF}
fi
##
if ! grep -q '^[[:blank:]]*activation[[:blank:]]*{' ${LVM_CONF}
then cat >>${LVM_CONF} <<EOF
# Added on the fly by ${0##*/} from the initramfs.
# See lvm.conf(5) and bilibop(7) for details.
activation {
}
EOF
fi
}
# ===========================================================================}}}
# blacklist_bilibop_devices() ==============================================={{{
# What we want is: avoid breakage of readonly settings by lvm tools, especially
# 'vgchange -ay'. This command usually bypasses the 'ro' attribute of a block
# device (obtained with 'blockdev --setro DEVICE' or 'hdparm -r1 DEVICE'), and
# silently unmounts it. If this device contains the root filesystem, it can
# happen that all is mounted on / is silently unmounted (/boot, /home, /proc,
# /sys, /dev, /tmp and more) and becomes unmountable until the next reboot.
# So, we need to blacklist all known bilibop Physical Volumes by setting the
# 'filter' and 'global_filter' arrays in lvm.conf(5).
blacklist_bilibop_devices() {
${DEBUG} && echo "> blacklist_bilibop_devices $@" >&2
local node
for node in $(device_nodes)
do
[ "${udev_root}/${node}" = "${BILIBOP_DISK}" ] &&
continue
[ "$(physical_hard_disk ${udev_root}/${node})" != "${BILIBOP_DISK}" ] &&
continue
blacklist=
ID_FS_TYPE=
DEVLINKS=
eval $(query_udev_envvar ${node})
[ "${ID_FS_TYPE}" = "LVM2_member" ] ||
continue
DEVLINKS="$(echo ${DEVLINKS} | sed "s,${udev_root}/,,g")"
[ "${udev_root}/${node}" = "${BILIBOP_PART}" ] &&
DEVLINKS="${BILIBOP_COMMON_BASENAME}/part ${DEVLINKS}"
blacklist="$(echo ${node} ${DEVLINKS} | sed 's, \+,|,g')"
sed -i "s;^\s*\(global_\)\?filter\s*=\s*\[\s*;&\"r#^${UDEV_ROOT}/(${blacklist})\$#\", ;" ${LVM_CONF}
done
}
# ===========================================================================}}}
# set_readonly_lvm_settings() ==============================================={{{
# What we want is: overwrite temporary lvm.conf (into initrd or on aufs) and
# set some variables to make VG and LV read-only (content + metadata).
# In 'global' section:
# locking_type = 4
# metadata_read_only = 1
# In 'activation' section:
# read_only_volume_list = [ "vg0/lv0", "vg0/lv1", "vg1/lv0", "vg1/lv1", "vg1/lv2" ]
#
# NOTE: we cannot use 'lvchange --permission r' here or elsewhere, because
# (unlike 'blockdev --setro'), this makes the readonly setup persistent, and
# this would need additional stuff to undo that at the good time by running
# 'lvchange --permission rw'. Additionally, this changes LV metadata, and this
# is exactly what we want to avoid.
set_readonly_lvm_settings() {
${DEBUG} && echo "> set_readonly_lvm_settings $@" >&2
cp ${LVM_CONF} ${LVM_CONF}.bak
sed -i 's|^\(\s*locking_type\s*=\s*\).*|\14|' ${LVM_CONF}
# This prohibits execution of commands such as vgchange or lvchange in new
# releases of lvm2, so don't do that:
#sed -i 's|^\(\s*metadata_read_only\s*=\s*\).*|\11|' ${LVM_CONF}
for lvm in $(cat /etc/lvm/bilibop)
do
ROVL="${ROVL:+${ROVL}, }\"${lvm}\""
done
[ -n "${ROVL}" ] || return 0
if grep -q '^[[:blank:]]*read_only_volume_list[[:blank:]]*=' ${LVM_CONF} ; then
sed -i "s|^\s*read_only_volume_list\s*=\s*[|& ${ROVL},|" ${LVM_CONF}
else
sed -i "s|^\s*activation\s*{.*|&\n read_only_volume_list = [ ${ROVL} ]|" ${LVM_CONF}
fi
}
# ===========================================================================}}}
# undo_readonly_dm_settings() ==============================================={{{
# What we want is: undo the readonly settings that have been done from the
# init-top initramfs script. At first, we have to restore lvm.conf in the
# initrd environment, and make Logical Volumes and dm-crypt devices writable.
undo_readonly_dm_settings() {
${DEBUG} && echo "> undo_readonly_dm_settings $@" >&2
[ -f /etc/lvm/bilibop ] || return 0
[ -f /etc/lvm/lvm.conf.bak ] || return 0
mv /etc/lvm/lvm.conf.bak /etc/lvm/lvm.conf
for dev in ${udev_root}/dm-*; do
[ -b ${dev} ] &&
blockdev --setrw ${dev}
done
}
# ===========================================================================}}}
# activate_bilibop_lv() ====================================================={{{
# What we want is: activate Logical Volumes listed in /etc/lvm/bilibop. It can
# happen that some LV are not yet activated at this point: the initramfs lvm2
# script activates $ROOT and $resume only (the initramfs cryptroot script is
# less selective). After 'blacklist_bilibop_devices()', there will be no way
# for the lvm init script to activate missing LV, and mount (between others)
# will fail.
activate_bilibop_lv() {
${DEBUG} && echo "> activate_bilibop_lv $@" >&2
[ -f /etc/lvm/bilibop ] || return 0
local vg_lv
for vg_lv in $(cat /etc/lvm/bilibop); do
if [ ! -e "${udev_root}/${vg_lv}" ]; then
lvm lvchange -a y --sysinit ${vg_lv}
fi
done
}
# ===========================================================================}}}
# unlock_logical_volume() ==================================================={{{
# What we want is: avoid mount errors for whitelisted devices/mountpoints. For
# that, we have to override, from the local-bottom script, some settings done
# from the init-top script: reset readonly attribute of a whitelisted Logical
# Volume, and remove it from the list of the Logical Volumes to set read-only.
# This function is called from parse_and_modify_fstab().
unlock_logical_volume() {
${DEBUG} && echo "> unlock_logical_volume $@" >&2
local dev="$(get_device_node ${1})"
for lvm in $(cat /etc/lvm/bilibop)
do
[ -e "${udev_root}/${lvm}" ] || continue
if [ "$(readlink -f ${udev_root}/${lvm})" = "${dev}" ]
then
sed -i "s,^${lvm}$,," /etc/lvm/bilibop
blockdev --setrw ${dev}
break
fi
done
}
# ===========================================================================}}}
# plymouth_message() ========================================================{{{
# What we want is: tell plymouth daemon to display a message. (Plymouth is the
# name of the standard graphical boot splash on Linux)
plymouth_message() {
${DEBUG} && echo "> plymouth_message $@" >&2
if [ -x /bin/plymouth ] && plymouth --ping
then plymouth message --text="$@"
fi
}
# ===========================================================================}}}
# is_physically_locked() ===================================================={{{
# What we want is: return 0 if a drive given as argument (generally a USB key
# or a SD/MMC card) is write-protected, i.e. physically locked by a switch,
# and 1 otherwise. Since this function relies on the output of dmesg, it must
# be called very early (or it may happen that the relevant info is flushed or
# unbuffered). As far as I know, only USB keys and Flash memory cards may have
# a switch to lock them; there are two 'syntaxes', depending on the media type.
is_physically_locked() {
${DEBUG} && echo "> is_physically_locked $@" >&2
case "${1}" in
sd?)
if dmesg | grep -q "\[${1}\] [Ww]rite [Pp]rotect [Ii]s [Oo]n$"; then
return 0
fi
;;
mmcblk?|mspblk?)
if dmesg | grep -q "[[:blank:]]${1}: .* [1-9][0-9]*\(\.[0-9]\+\)\? [GM]i\?B (ro)$"; then
return 0
fi
;;
esac
return 1
}
# ===========================================================================}}}
|