Linux ip-172-26-7-228 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64
Your IP : 18.116.52.29
| Current Path : /usr/sbin/ | |
| | Current File : //usr/sbin/update-initramfs |
#!/bin/sh
STATEDIR=/var/lib/initramfs-tools
BOOTDIR=/boot
CONF=/etc/initramfs-tools/update-initramfs.conf
mode=""
version=""
update_initramfs=yes
backup_initramfs=no
set -e
[ -r ${CONF} ] && . ${CONF}
case "$DPKG_MAINTSCRIPT_PACKAGE" in
linux-image-*)
if [ -z "$INITRAMFS_TOOLS_KERNEL_HOOK" ]; then
# kernel maintainer script called us directly; ignore
# it and let the hook script handle it instead
echo "update-initramfs: deferring update (hook will be called later)"
exit 0
fi
;;
?*)
if [ $# = 1 ] \
&& [ x"$1" = x-u ] \
&& dpkg-trigger --check-supported 2>/dev/null
then
if dpkg-trigger --no-await update-initramfs; then
echo "update-initramfs: deferring update (trigger activated)"
exit 0
fi
fi
;;
esac
usage()
{
if [ -n "${1:-}" ]; then
printf "${*}\n\n" >&2
fi
cat >&2 << EOF
Usage: ${0} [OPTION]...
Options:
-k version Specify kernel version or 'all'
-c Create a new initramfs
-u Update an existing initramfs
-d Remove an existing initramfs
-t Take over a custom initramfs with this one
-b directory Set alternate boot directory
-v Be verbose
-h This message
EOF
exit 1
}
mild_panic()
{
if [ -n "${1:-}" ]; then
printf "${*}\n" >&2
fi
exit 0
}
panic()
{
if [ -n "${1:-}" ]; then
printf "${*}\n" >&2
fi
exit 1
}
verbose()
{
if [ "${verbose}" = 1 ]; then
printf "${*}\n"
fi
}
version_exists()
{
[ -e "${STATEDIR}/${1}" ] && [ -e "${initramfs}" ]
return $?
}
set_initramfs()
{
initramfs="${BOOTDIR}/initrd.img-${version}"
}
# backup initramfs while running
backup_initramfs()
{
[ ! -r "${initramfs}" ] && return 0
initramfs_bak="${initramfs}.dpkg-bak"
[ -r "${initramfs_bak}" ] && rm -f "${initramfs_bak}"
ln -f "${initramfs}" "${initramfs_bak}" \
|| cp -a "${initramfs}" "${initramfs_bak}"
verbose "Keeping ${initramfs_bak}"
}
# keep booted initramfs
backup_booted_initramfs()
{
initramfs_bak="${initramfs}.dpkg-bak"
# first time run thus no backup
[ ! -r "${initramfs_bak}" ] && return 0
# chroot with no /proc
[ ! -r /proc/uptime ] && rm -f "${initramfs_bak}" && return 0
# no kept backup wanted
[ "${backup_initramfs}" = "no" ] && rm -f "${initramfs_bak}" && return 0
# no backup yet
if [ ! -r "${initramfs}.bak" ]; then
mv -f ${initramfs_bak} "${initramfs}.bak"
verbose "Backup ${initramfs}.bak"
return 0
fi
# keep booted initramfs
boot_initramfs=
uptime_days=$(awk '{printf "%d", $1 / 3600 / 24}' /proc/uptime)
if [ -n "$uptime_days" ]; then
boot_initramfs=$(find "${initramfs}.bak" -mtime +${uptime_days})
fi
if [ -n "${boot_initramfs}" ]; then
mv -f "${initramfs_bak}" "${initramfs}.bak"
verbose "Backup ${initramfs}.bak"
return 0
fi
verbose "Removing current backup ${initramfs_bak}"
rm -f ${initramfs_bak}
}
# nuke generated copy
remove_initramfs_bak()
{
[ -z "${initramfs_bak:-}" ] && return 0
rm -f "${initramfs_bak}"
verbose "Removing ${initramfs_bak}"
}
generate_initramfs()
{
echo "update-initramfs: Generating ${initramfs}"
OPTS="-o"
if [ "${verbose}" = 1 ]; then
OPTS="-v ${OPTS}"
fi
if mkinitramfs ${OPTS} "${initramfs}.new" "${version}"; then
mv -f "${initramfs}.new" "${initramfs}"
set_sha1
# Guard against an unclean shutdown
sync -f "${initramfs}"
else
mkinitramfs_return="$?"
remove_initramfs_bak
rm -f "${initramfs}.new"
echo "update-initramfs: failed for ${initramfs} with $mkinitramfs_return." >&2
exit $mkinitramfs_return
fi
}
# Invoke bootloader
run_bootloader()
{
# invoke policy conformant bootloader hooks
if [ -d /etc/initramfs/post-update.d/ ]; then
run-parts --arg=${version} --arg=${initramfs} \
/etc/initramfs/post-update.d/
return 0
fi
}
compare_sha1()
{
sha1sum "${initramfs}" | diff "${STATEDIR}/${version}" - >/dev/null 2>&1
return $?
}
# Note that this must overwrite so that updates work.
set_sha1()
{
sha1sum "${initramfs}" > "${STATEDIR}/${version}"
}
delete_sha1()
{
rm -f "${STATEDIR}/${version}"
}
# ro /boot is not modified
ro_boot_check()
{
# check irrelevant inside of a chroot
if [ ! -r /proc/mounts ] || ischroot; then
return 0
fi
boot_opts=$(awk '/boot/{if ((match($4, /^ro/) || match($4, /,ro/)) \
&& $2 == "/boot") print "ro"}' /proc/mounts)
if [ -n "${boot_opts}" ]; then
echo "WARNING: /boot is ro mounted."
echo "update-initramfs: Not updating ${initramfs}"
exit 0
fi
}
get_sorted_versions()
{
version_list="$(ls -1 "${STATEDIR}" | linux-version sort --reverse)"
verbose "Available versions: ${version_list}"
}
set_current_version()
{
if [ -f /boot/initrd.img-`uname -r` ]; then
version=`uname -r`
fi
}
set_linked_version()
{
linktarget=
if [ -e /initrd.img ] && [ -L /initrd.img ]; then
linktarget="$(basename "$(readlink /initrd.img)")"
fi
if [ -e /boot/initrd.img ] && [ -L /boot/initrd.img ]; then
linktarget="$(basename "$(readlink /boot/initrd.img)")"
fi
if [ -z "${linktarget}" ]; then
return
fi
version="${linktarget##initrd.img-}"
}
set_highest_version()
{
get_sorted_versions
if [ -z "${version_list}" ]; then
version=
return
fi
set -- ${version_list}
version=${1}
}
create()
{
if [ -z "${version}" ]; then
usage "Create mode requires a version argument"
fi
set_initramfs
if [ "${takeover}" = 0 ]; then
if version_exists "${version}"; then
panic "Cannot create version ${version}: already exists"
fi
if [ -e "${initramfs}" ]; then
panic "${initramfs} already exists, cannot create."
fi
fi
generate_initramfs
run_bootloader
}
update()
{
if [ "${update_initramfs}" = "no" ]; then
echo "update-initramfs: Not updating initramfs."
exit 0
fi
if [ -z "${version}" ]; then
set_highest_version
fi
if [ -z "${version}" ]; then
set_linked_version
fi
if [ -z "${version}" ]; then
set_current_version
fi
if [ -z "${version}" ]; then
verbose "Nothing to do, exiting."
exit 0
fi
set_initramfs
ro_boot_check
altered_check
backup_initramfs
generate_initramfs
run_bootloader
backup_booted_initramfs
}
delete()
{
if [ -z "${version}" ]; then
usage "Delete mode requires a version argument"
fi
set_initramfs
if [ "${takeover}" = 0 ]; then
if [ ! -e "${initramfs}" ]; then
panic "Cannot delete ${initramfs}, doesn't exist."
fi
if ! version_exists "${version}"; then
panic "Cannot delete version ${version}: Not created by this utility."
fi
fi
altered_check
echo "update-initramfs: Deleting ${initramfs}"
delete_sha1
rm -f "${initramfs}" "${initramfs}.bak"
}
# Check for update mode on existing and modified initramfs
altered_check()
{
# No check on takeover
[ "${takeover}" = 1 ] && return 0
if [ ! -e "${initramfs}" ]; then
mild_panic "${initramfs} does not exist. Cannot update."
fi
if ! compare_sha1; then
echo "update-initramfs: ${initramfs} has been altered." >&2
mild_panic "update-initramfs: Cannot update. Override with -t option."
fi
}
# Defaults
verbose=0
yes=0
# We default to takeover=1 in Ubuntu, but not Debian
takeover=1
##
while getopts "k:cudyvtb:h?" flag; do
case "${flag}" in
k)
version="${OPTARG}"
;;
c)
mode="c"
;;
d)
mode="d"
;;
u)
mode="u"
;;
v)
verbose="1"
;;
y)
yes="1"
;;
t)
takeover="1"
;;
b)
BOOTDIR="${OPTARG}"
if [ ! -d "${BOOTDIR}" ]; then
echo "Error: ${BOOTDIR} is not a directory." >&2
exit 1
fi
;;
h|?)
usage
;;
esac
done
shift $((${OPTIND} - 1))
if [ $# -ne 0 ]; then
printf "Extra argument '%s'\n\n" "$1" >&2
usage
fi
# Validate arguments
if [ -z "${mode}" ]; then
usage "You must specify at least one of -c, -u, or -d."
fi
if [ "${version}" = "all" ] \
|| ( [ "${update_initramfs}" = "all" ] && [ -z "${version}" ] ); then
: FIXME check for --yes, and if not ask are you sure
get_sorted_versions
if [ -z "${version_list}" ]; then
verbose "Nothing to do, exiting."
exit 0
fi
OPTS="-b ${BOOTDIR}"
if [ "${verbose}" = "1" ]; then
OPTS="${OPTS} -v"
fi
if [ "${takeover}" = "1" ]; then
OPTS="${OPTS} -t"
fi
if [ "${yes}" = "1" ]; then
OPTS="${OPTS} -y"
fi
for u_version in ${version_list}; do
verbose "Execute: ${0} -${mode} -k \"${u_version}\" ${OPTS}"
"${0}" -${mode} -k "${u_version}" ${OPTS}
done
exit 0
fi
case "${mode}" in
c)
create
;;
d)
delete
;;
u)
update
;;
esac
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