Edit: /usr/sbin/update-initramfs (6908B)
#!/bin/sh
BOOTDIR=/boot
CONF=/etc/initramfs-tools/update-initramfs.conf
mode=""
version=""
update_initramfs=yes
backup_initramfs=no
set -e
[ -r ${CONF} ] && . ${CONF}
if [ -n "$DPKG_MAINTSCRIPT_PACKAGE" ] && [ $# = 1 ] && [ "$1" = -u ]; then
if dpkg-trigger --no-await update-initramfs; then
echo "update-initramfs: deferring update (trigger activated)"
exit 0
fi
fi
usage()
{
cat << EOF
Usage: update-initramfs {-c|-d|-u} [-k version] [-v] [-b directory]
Options:
-k version Specify kernel version or 'all'
-c Create a new initramfs
-u Update an existing initramfs
-d Remove an existing initramfs
-b directory Set alternate boot directory
-v Be verbose
See update-initramfs(8) for further details.
EOF
}
usage_error()
{
if [ -n "${1:-}" ]; then
printf "%s\\n\\n" "${*}" >&2
fi
usage >&2
exit 2
}
mild_panic()
{
if [ -n "${1:-}" ]; then
printf "%s\\n" "${*}" >&2
fi
exit 0
}
panic()
{
if [ -n "${1:-}" ]; then
printf "%s\\n" "${*}" >&2
fi
exit 1
}
verbose()
{
if [ "${verbose}" = 1 ]; then
printf "%s\\n" "${*}"
fi
}
set_initramfs()
{
initramfs="${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
# shellcheck disable=SC2086
if mkinitramfs ${OPTS} "${initramfs}.new" "${version}"; then
mv -f "${initramfs}.new" "${initramfs}"
# Guard against an unclean shutdown
sync -f "${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="${initramfs}" \
/etc/initramfs/post-update.d/
return 0
fi
}
# ro /boot is not modified
ro_boot_check()
{
# check irrelevant inside of a chroot
if [ ! -r /proc/mounts ] || ischroot; then
return 0
fi
# shellcheck disable=SC1004
boot_opts=$(awk '/boot/{if ((match($4, /^ro/) || match($4, /,ro/)) \
&& $2 == "/boot") print "ro"}' /proc/mounts)
if [ -n "${boot_opts}" ]; then
echo "W: /boot is ro mounted." >&2
echo "W: update-initramfs: Not updating ${initramfs}" >&2
exit 0
fi
}
get_sorted_versions()
{
version_list="$(
linux-version list |
while read -r version; do
test -e "${BOOTDIR}/initrd.img-$version" && echo "$version"
done |
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
# shellcheck disable=SC2086
set -- ${version_list}
version=${1}
}
create()
{
if [ -z "${version}" ]; then
usage_error "Create mode requires a version argument"
fi
set_initramfs
generate_initramfs
run_bootloader
}
update()
{
if [ "${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
backup_initramfs
generate_initramfs
run_bootloader
backup_booted_initramfs
}
delete()
{
if [ -z "${version}" ]; then
usage_error "Delete mode requires a version argument"
fi
set_initramfs
echo "update-initramfs: Deleting ${initramfs}"
rm -f "${initramfs}" "${initramfs}.bak"
}
# Defaults
verbose=0
##
OPTIONS=$(getopt -o "k:cudvtb:h?" --long help -n "$0" -- "$@") || usage_error
eval set -- "$OPTIONS"
while true; do
case "$1" in
-k)
version="$2"
shift 2
;;
-c)
mode="c"
shift
;;
-d)
mode="d"
shift
;;
-u)
mode="u"
shift
;;
-v)
verbose="1"
shift
;;
-t)
# accepted for compatibility, but ignored
shift
;;
-b)
BOOTDIR="$2"
if [ ! -d "${BOOTDIR}" ]; then
echo "E: ${BOOTDIR} is not a directory." >&2
exit 1
fi
shift 2
;;
-h|-\?|--help)
usage
exit 0
;;
--)
shift
break
;;
esac
done
if [ $# -ne 0 ]; then
printf "Extra argument '%s'\\n\\n" "$1" >&2
usage_error
fi
# Validate arguments
if [ -z "${mode}" ]; then
usage_error "You must specify at least one of -c, -u, or -d."
fi
if [ "${version}" = "all" ] \
|| { [ "${update_initramfs}" = "all" ] && [ -z "${version}" ]; }; then
case "${mode}" in
c)
version_list="$(linux-version list)"
;;
d | u)
get_sorted_versions
;;
esac
if [ -z "${version_list}" ]; then
verbose "Nothing to do, exiting."
exit 0
fi
OPTS="-b ${BOOTDIR}"
if [ "${verbose}" = "1" ]; then
OPTS="${OPTS} -v"
fi
for u_version in ${version_list}; do
verbose "Execute: ${0} -${mode} -k \"${u_version}\" ${OPTS}"
# shellcheck disable=SC2086
"${0}" -${mode} -k "${u_version}" ${OPTS}
done
exit 0
fi
case "${mode}" in
c)
create
;;
d)
delete
;;
u)
update
;;
esac