181 lines
4.3 KiB
Plaintext
Executable File
181 lines
4.3 KiB
Plaintext
Executable File
#!/busybox sh
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NORMAL="\\033[0m" # white on black, or whatever your terminal is
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FAIL="\\033[1;31m" # red foreground
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OK="\\033[1;32m" # green foreground
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INFO="\\033[1;34m" # blue foreground
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alias tar='/busybox tar -C /roottmpfs -xpf -'
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alias bzcat='/busybox bzcat'
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alias xzcat='/busybox xzcat'
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alias mount='/busybox mount'
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alias umount='/busybox umount'
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emergency() {
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echo ""
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echo -e "${FAIL}It failed! Panic shell!${NORMAL}"
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echo ""
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/busybox --install -s
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exec /bin/sh
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}
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info() {
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echo -en "-${INFO}|${NORMAL}-" ${@} "... "
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}
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isok() {
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if [[ $1 -eq 0 ]]; then
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echo -e "${INFO}[ ${OK}OK${INFO} ]${NORMAL}"
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else
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echo -e "${INFO}[ ${FAIL}FAIL${INFO} ]${NORMAL}"
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emergency
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fi
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}
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info "disabling console blanking, hopefully"
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echo -e '\033[9;0]\033[14;0]' > /dev/console
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info "waiting for usb devices to settle"
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echo ""
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for i in 10 9 8 7 6 5 4 3 2 1 0; do
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echo -en ${i}'\r'
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/busybox sleep 1
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done
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echo ""
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isok 0
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info "mounting devtmpfs"
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/busybox mount -n -t devtmpfs devtmpfs ./dev
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isok $?
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info "mounting proc"
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/busybox mount -n -t proc proc ./proc
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isok $?
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info "getting root tmpfs size"
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for var in $(cat /proc/cmdline); do
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if [[ ${var/=*} = rootfs_size ]]; then
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size=${var/*=}
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fi
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done
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if [[ -z ${size} ]]; then
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info "going with default: 4G"
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size="4G"
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fi
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isok 0
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info "trying to mount root tmpfs"
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/busybox mount -n -o size=${size} -t tmpfs roottmpfs /roottmpfs
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isok $?
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info "checking if the user wants to use a different init"
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for var in $(cat /proc/cmdline); do
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if [[ ${var/=*} = init ]]; then
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init="${var/*=}"
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info "user wants ${init}"
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fi
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done
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if [[ -z "${init}" ]]; then
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info "no; default: /sbin/init"
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init="/sbin/init"
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isok $?
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fi
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info "checking for network configuration on kernel commandline"
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echo ""
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for var in $(cat /proc/cmdline); do
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case "${var/=*}" in
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# Split the "value" part of this parameter into parts, with "," as
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# separators and then use them for constructing iproute2 or brctl
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# commandline.
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# Don't do any input validation; escape to the shell if things break.
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# Do it in a subshell to prevent IFS change leak.
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ipcmd)
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(
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IFS=","
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set -- ${var/*=}
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info "ip ${@}"
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/busybox ip ${@}
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isok $?
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)
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;;
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brctl)
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(
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IFS=","
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set -- ${var/*=}
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info "brctl ${@}"
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/busybox brctl ${@}
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isok $?
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)
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;;
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esac
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done
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# syntax examples:
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# rootfs_part=uuid|f822d881-d88a-4200-a9cf-6986c5a3e69a/some_directory/file|xzcat|tar
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# -> findfs -> mount -> xzcat | tar
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# rootfs_part=url|http://10.3.13.37/url.tar.bz2|bzcat|tar
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# -> wget -O - | bzcat | tar
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# You might find bugs & dragons here; patches accepted.
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info "looking for root filesystem tarballs"
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echo ""
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for var in $(cat /proc/cmdline); do
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if [[ "${var/=*}" = rootfs_part ]]; then
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part="${var/*=}"
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info "found ${part}"
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# uuid or url
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url_type="${part/|*}"
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# url + transformations
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url="${part#${url_type}|}"
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# transformations
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transformations="${url#*|}"
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# url
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url="${url/|*}"
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(
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if [[ ${url_type} = "uuid" ]]; then
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uuid="${url%%/*}"
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filepath="${url#*/}"
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info "mounting $(findfs UUID="${uuid}") on /mnt"
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mount -n -o ro "$(findfs UUID="${uuid}")" /mnt
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isok $?
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info "unpacking /mnt/${filepath}"
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echo ""
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/pv "/mnt/${filepath}" | eval ${transformations}
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isok $?
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info "unmounting"
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umount -n /mnt
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isok $?
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else
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info "wgetting ${url} and transforming it on the fly"
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/busybox wget -O - "${url}" | eval ${transformations}
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isok $?
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fi
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)
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fi
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done
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info "unmounting /dev"
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/busybox umount -n /dev
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isok $?
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info "unmounting /proc"
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/busybox umount -n /proc
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isok $?
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info "checking if /roottmpfs/${init} exists"
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[[ -e /roottmpfs/${init} ]]
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isok $?
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info "trying to switch root"
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exec /busybox switch_root /roottmpfs /sbin/init
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echo ""
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echo -e "${FAIL}we should not reach this place! here be dragons!${NORMAL}"
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echo ""
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emergency
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