491 lines
9 KiB
Bash
Executable file
491 lines
9 KiB
Bash
Executable file
#!/bin/sh
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INITRAMFS_TOOLS_VERSION=@VERSION@
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STATEDIR=/var/lib/initramfs-tools
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BOOTDIR=/boot
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CONF=/etc/initramfs-tools/update-initramfs.conf
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mode=""
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version=""
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[ -r ${CONF} ] && . ${CONF}
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usage()
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{
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if [ -n "${1:-}" ]; then
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printf "${*}\n\n" >&2
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fi
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cat >&2 << EOF
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Usage: ${0} [OPTION]...
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Options:
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-k [version] Specify kernel version or 'all'
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-c Create a new initramfs
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-u Update an existing initramfs
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-d Remove an existing initramfs
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-t Take over a custom initramfs with this one
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-b Set alternate boot directory
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-B Do not update bootloader configuration file
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-v Be verbose
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-V Show initramfs-tools version
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-h This message
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EOF
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exit 1
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}
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# chroot check
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chrooted()
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{
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# borrowed from udev's postinst
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if [ "$(stat -c %d/%i /)" = "$(stat -Lc %d/%i /proc/1/root 2>/dev/null)" ]; then
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# the devicenumber/inode pair of / is the same as that of
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# /sbin/init's root, so we're *not* in a chroot and hence
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# return false.
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return 1
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fi
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return 0
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}
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mild_panic()
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{
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if [ -n "${1:-}" ]; then
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printf "${*}\n" >&2
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fi
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exit 0
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}
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panic()
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{
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if [ -n "${1:-}" ]; then
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printf "${*}\n" >&2
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fi
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exit 1
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}
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verbose()
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{
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if [ "${verbose}" = 1 ]; then
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printf "${*}\n"
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fi
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}
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version_exists()
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{
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[ -e "${STATEDIR}/${1}" ] && [ -e "${initramfs}" ]
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return $?
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}
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set_initramfs()
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{
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initramfs="${BOOTDIR}/initrd.img-${version}"
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}
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# backup initramfs while running
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backup_initramfs()
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{
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[ ! -r "${initramfs}" ] && return 0
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initramfs_bak="${initramfs}.dpkg-bak"
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[ -r "${initramfs_bak}" ] && rm -f "${initramfs_bak}"
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ln -f "${initramfs}" "${initramfs_bak}" \
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|| cp -a "${initramfs}" "${initramfs_bak}"
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verbose "Keeping ${initramfs_bak}"
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}
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# keep booted initramfs
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backup_booted_initramfs()
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{
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initramfs_bak="${initramfs}.dpkg-bak"
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# first time run thus no backup
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[ ! -r "${initramfs_bak}" ] && return 0
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# chroot with no /proc
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[ ! -r /proc/uptime ] && rm -f "${initramfs_bak}" && return 0
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# no kept backup wanted
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[ "${backup_initramfs}" = "no" ] && rm -f "${initramfs_bak}" && return 0
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# no backup yet
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if [ ! -r "${initramfs}.bak" ]; then
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mv -f ${initramfs_bak} "${initramfs}.bak"
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verbose "Backup ${initramfs}.bak"
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return 0
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fi
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# keep booted initramfs
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boot_initramfs=
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uptime_days=$(awk '{printf "%d", $1 / 3600 / 24}' /proc/uptime)
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if [ -n "$uptime_days" ]; then
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boot_initramfs=$(find "${initramfs}.bak" -mtime +${uptime_days})
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fi
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if [ -n "${boot_initramfs}" ]; then
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mv -f "${initramfs_bak}" "${initramfs}.bak"
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verbose "Backup ${initramfs}.bak"
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return 0
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fi
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verbose "Removing current backup ${initramfs_bak}"
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rm -f ${initramfs_bak}
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}
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# nuke generated copy
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remove_initramfs_bak()
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{
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[ -z "${initramfs_bak:-}" ] && return 0
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rm -f "${initramfs_bak}"
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verbose "Removing ${initramfs_bak}"
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}
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generate_initramfs()
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{
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echo "update-initramfs: Generating ${initramfs}"
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OPTS="-o"
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if [ "${verbose}" = 1 ]; then
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OPTS="-v ${OPTS}"
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fi
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if mkinitramfs ${OPTS} "${initramfs}.new" "${version}"; then
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mv -f "${initramfs}.new" "${initramfs}"
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set_sha1
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else
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mkinitramfs_return="$?"
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remove_initramfs_bak
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rm -f "${initramfs}.new"
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if [ "$mkinitramfs_return" = "2" ]; then
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# minversion wasn't met, exit 0
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exit 0
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fi
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echo "update-initramfs: failed for ${initramfs}" >&2
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exit $mkinitramfs_return
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fi
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}
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# Invoke bootloader
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run_bootloader()
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{
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local grub_installed
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[ -r /boot/grub/grub.cfg ] \
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&& groot=$(awk '/^set root=/{print substr($2, 8, 3); exit}' \
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/boot/grub/grub.cfg)
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[ -e /boot/grub/device.map ] && [ -n "${groot}" ] \
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&& dev=$(awk "/${groot}/{ print \$NF}" /boot/grub/device.map)
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if [ -n "${dev}" -a -r "${dev}" ]; then
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dd if="${dev}" bs=512 skip=0 count=1 2>/dev/null|grep -q GRUB
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[ $? -eq 0 ] && grub_installed=1
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fi
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if [ -n "${dev}" -a -z "$grub_installed" ]; then
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echo "WARNING: GRUB2 has not been installed into ${dev}."
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echo "update-initramfs: please run 'grub-install ${dev}'."
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fi
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if command -v grub-mkconfig >/dev/null 2>&1; then
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grub-mkconfig -o /boot/grub/grub.cfg
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fi
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}
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compare_sha1()
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{
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sha1sum "${initramfs}" | diff "${STATEDIR}/${version}" - >/dev/null 2>&1
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return $?
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}
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# Note that this must overwrite so that updates work.
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set_sha1()
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{
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sha1sum "${initramfs}" > "${STATEDIR}/${version}"
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}
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delete_sha1()
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{
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rm -f "${STATEDIR}/${version}"
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}
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# ro /boot is not modified
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ro_boot_check()
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{
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# check irrelevant inside of a chroot
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if [ ! -r /proc/mounts ] || chrooted; then
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return 0
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fi
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boot_opts=$(awk '/boot/{if ((match($4, /^ro/) || match($4, /,ro/)) \
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&& $2 == "/boot") print "ro"}' /proc/mounts)
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if [ -n "${boot_opts}" ]; then
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echo "WARNING: /boot is ro mounted."
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echo "update-initramfs: Not updating ${initramfs}"
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exit 0
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fi
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}
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get_sorted_versions()
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{
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version_list=""
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for gsv_x in "${STATEDIR}"/*; do
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gsv_x="$(basename "${gsv_x}")"
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if [ "${gsv_x}" = '*' ]; then
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return 0
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fi
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worklist=""
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for gsv_i in $version_list; do
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xbps-uhelper cmpver "${gsv_x}" "${gsv_i}"
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if [ $? -eq 0 ] || [ $? -eq 1 ]; then
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worklist="${worklist} ${gsv_x} ${gsv_i}"
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gsv_x=""
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else
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worklist="${worklist} ${gsv_i}"
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fi
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done
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if [ "${gsv_x}" != "" ]; then
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worklist="${worklist} ${gsv_x}"
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fi
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version_list="${worklist}"
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done
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verbose "Available versions: ${version_list}"
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}
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set_current_version()
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{
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if [ -f /boot/initrd.img-`uname -r` ]; then
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version=`uname -r`
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fi
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}
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set_linked_version()
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{
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linktarget=
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if [ -e /initrd.img ] && [ -L /initrd.img ]; then
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linktarget="$(basename "$(readlink /initrd.img)")"
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fi
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if [ -e /boot/initrd.img ] && [ -L /boot/initrd.img ]; then
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linktarget="$(basename "$(readlink /boot/initrd.img)")"
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fi
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if [ -z "${linktarget}" ]; then
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return
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fi
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version="${linktarget##initrd.img-}"
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}
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set_highest_version()
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{
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get_sorted_versions
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if [ -z "${version_list}" ]; then
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version=
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return
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fi
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set -- ${version_list}
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version=${1}
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}
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create()
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{
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if [ -z "${version}" ]; then
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usage "Create mode requires a version argument"
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fi
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set_initramfs
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if [ "${takeover}" = 0 ]; then
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if version_exists "${version}"; then
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panic "Cannot create version ${version}: already exists"
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fi
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if [ -e "${initramfs}" ]; then
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panic "${initramfs} already exists, cannot create."
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fi
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fi
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generate_initramfs
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[ -n "${dogrub}" ] && run_bootloader
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}
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update()
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{
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if [ "${update_initramfs}" = "no" ]; then
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echo "update-initramfs: Not updating initramfs."
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exit 0
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fi
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if [ -z "${version}" ]; then
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set_highest_version
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fi
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if [ -z "${version}" ]; then
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set_linked_version
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fi
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if [ -z "${version}" ]; then
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set_current_version
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fi
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if [ -z "${version}" ]; then
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verbose "Nothing to do, exiting."
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exit 0
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fi
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set_initramfs
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ro_boot_check
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altered_check
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backup_initramfs
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generate_initramfs
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[ -n "${dogrub}" ] && run_bootloader
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backup_booted_initramfs
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}
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delete()
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{
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if [ -z "${version}" ]; then
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usage "Delete mode requires a version argument"
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fi
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set_initramfs
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if [ "${takeover}" = 0 ]; then
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if [ ! -e "${initramfs}" ]; then
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panic "Cannot delete ${initramfs}, doesn't exist."
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fi
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if ! version_exists "${version}"; then
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panic "Cannot delete version ${version}: Not created by this utility."
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fi
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fi
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altered_check
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echo "update-initramfs: Deleting ${initramfs}"
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delete_sha1
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rm -f "${initramfs}" "${initramfs}.bak"
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}
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# Check for update mode on existing and modified initramfs
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altered_check()
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{
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# No check on takeover
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[ "${takeover}" = 1 ] && return 0
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if [ ! -e "${initramfs}" ]; then
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mild_panic "${initramfs} does not exist. Cannot update."
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fi
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if ! compare_sha1; then
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echo "update-initramfs: ${initramfs} has been altered." >&2
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mild_panic "update-initramfs: Cannot update. Override with -t option."
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fi
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}
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# Defaults
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verbose=0
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yes=0
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# We default to takeover=1 in Ubuntu, but not Debian
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takeover=0
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dogrub=1
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##
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while getopts "k:cudyvtb:h?BV" flag; do
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case "${flag}" in
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B)
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unset dogrub
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;;
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k)
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version="${OPTARG}"
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;;
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c)
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mode="c"
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;;
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d)
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mode="d"
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;;
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u)
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mode="u"
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;;
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v)
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verbose="1"
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;;
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y)
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yes="1"
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;;
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t)
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takeover="1"
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;;
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b)
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BOOTDIR="${OPTARG}"
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if [ ! -d "${BOOTDIR}" ]; then
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echo "Error: ${BOOTDIR} is not a directory." >&2
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exit 1
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fi
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;;
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V)
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echo "${INITRAMFS_TOOLS_VERSION}"
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exit 0
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;;
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h|?)
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usage
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;;
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esac
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done
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shift $((${OPTIND} - 1))
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if [ $# -ne 0 ]; then
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echo "Invalid argument for option -k." >&2
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usage
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fi
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# Validate arguments
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if [ -z "${mode}" ]; then
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usage "You must specify at least one of -c, -u, or -d."
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fi
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if [ "${version}" = "all" ] \
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|| ( [ "${update_initramfs}" = "all" ] && [ -z "${version}" ] ); then
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: FIXME check for --yes, and if not ask are you sure
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get_sorted_versions
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if [ -z "${version_list}" ]; then
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verbose "Nothing to do, exiting."
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exit 0
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fi
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OPTS="-b ${BOOTDIR}"
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if [ "${verbose}" = "1" ]; then
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OPTS="${OPTS} -v"
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fi
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if [ "${takeover}" = "1" ]; then
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OPTS="${OPTS} -t"
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fi
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if [ "${yes}" = "1" ]; then
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OPTS="${OPTS} -y"
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fi
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for u_version in ${version_list}; do
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verbose "Execute: ${0} -${mode} -k \"${u_version}\" ${OPTS}"
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"${0}" -${mode} -k "${u_version}" ${OPTS}
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done
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exit 0
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fi
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case "${mode}" in
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c)
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create
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;;
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d)
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delete
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;;
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u)
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update
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;;
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esac
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