310 lines
6.0 KiB
Plaintext
Executable File
310 lines
6.0 KiB
Plaintext
Executable File
#!/bin/busybox sh
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echo "Starting up the initramfs, please wait..."
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# Create required busybox symlinks
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for f in $(/bin/busybox --list); do
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[ "$f" = "modprobe" ] && continue
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/bin/busybox ln -s /bin/busybox /bin/${f}
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done
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[ -d /dev ] || mkdir -m 0755 /dev
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[ -d /root ] || mkdir -m 0700 /root
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[ -d /sys ] || mkdir /sys
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[ -d /proc ] || mkdir /proc
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[ -d /tmp ] || mkdir /tmp
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mkdir -p /var/lock
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mount -t sysfs -o nodev,noexec,nosuid sysfs /sys
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mount -t proc -o nodev,noexec,nosuid proc /proc
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# Note that this only becomes /dev on the real filesystem if udev's scripts
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# are used; which they will be, but it's worth pointing out
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tmpfs_size="10M"
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if [ -e /etc/udev/udev.conf ]; then
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. /etc/udev/udev.conf
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fi
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if ! mount -t devtmpfs -o mode=0755 devtmpfs /dev; then
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echo "W: devtmpfs not available, falling back to tmpfs for /dev"
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mount -t tmpfs -o size=$tmpfs_size,mode=0755 udev /dev
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[ -e /dev/console ] || mknod -m 0600 /dev/console c 5 1
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[ -e /dev/null ] || mknod /dev/null c 1 3
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fi
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mkdir /dev/pts
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mount -t devpts -o noexec,nosuid,gid=5,mode=0620 devpts /dev/pts || true
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> /dev/.initramfs-tools
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mkdir /dev/.initramfs
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# Export the dpkg architecture
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export DPKG_ARCH=
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. /conf/arch.conf
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# Set modprobe env
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export MODPROBE_OPTIONS="-qb"
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# Export relevant variables
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export ROOT=
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export ROOTDELAY=
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export ROOTFLAGS=
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export ROOTFSTYPE=
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export IP=
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export BOOT=
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export BOOTIF=
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export UBIMTD=
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export break=
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export init=/sbin/init
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export quiet=n
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export readonly=y
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export rootmnt=/root
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export debug=
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export panic=
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export blacklist=
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export resume=
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export resume_offset=
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# Bring in the main config
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. /conf/initramfs.conf
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for conf in conf/conf.d/*; do
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[ -f ${conf} ] && . ${conf}
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done
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. /scripts/functions
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# Parse command line options
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for x in $(cat /proc/cmdline); do
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case $x in
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init=*)
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init=${x#init=}
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;;
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root=*)
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ROOT=${x#root=}
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case $ROOT in
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LABEL=*)
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ROOT="${ROOT#LABEL=}"
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# support any / in LABEL= path (escape to \x2f)
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case "${ROOT}" in
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*/*)
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if command -v sed >/dev/null 2>&1; then
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ROOT="$(echo ${ROOT} | sed 's,/,\\x2f,g')"
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else
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if [ "${ROOT}" != "${ROOT#/}" ]; then
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ROOT="\x2f${ROOT#/}"
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fi
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if [ "${ROOT}" != "${ROOT%/}" ]; then
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ROOT="${ROOT%/}\x2f"
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fi
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IFS='/'
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newroot=
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for s in $ROOT; do
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newroot="${newroot:+${newroot}\\x2f}${s}"
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done
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unset IFS
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ROOT="${newroot}"
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fi
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esac
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ROOT="/dev/disk/by-label/${ROOT}"
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;;
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UUID=*)
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ROOT="/dev/disk/by-uuid/${ROOT#UUID=}"
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;;
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/dev/nfs)
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[ -z "${BOOT}" ] && BOOT=nfs
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;;
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esac
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;;
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rootflags=*)
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ROOTFLAGS="-o ${x#rootflags=}"
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;;
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rootfstype=*)
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ROOTFSTYPE="${x#rootfstype=}"
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;;
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rootdelay=*)
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ROOTDELAY="${x#rootdelay=}"
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case ${ROOTDELAY} in
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*[![:digit:].]*)
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ROOTDELAY=
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;;
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esac
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;;
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nfsroot=*)
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NFSROOT="${x#nfsroot=}"
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;;
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ip=*)
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IP="${x#ip=}"
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;;
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boot=*)
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BOOT=${x#boot=}
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;;
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ubi.mtd=*)
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UBIMTD=${x#ubi.mtd=}
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;;
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resume=*)
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RESUME="${x#resume=}"
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;;
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resume_offset=*)
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resume_offset="${x#resume_offset=}"
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;;
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noresume)
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noresume=y
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;;
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panic=*)
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panic="${x#panic=}"
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case ${panic} in
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*[![:digit:].]*)
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panic=
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;;
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esac
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;;
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quiet)
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quiet=y
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;;
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ro)
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readonly=y
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;;
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rw)
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readonly=n
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;;
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debug)
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debug=y
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quiet=n
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exec >/dev/.initramfs/initramfs.debug 2>&1
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set -x
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;;
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debug=*)
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debug=y
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quiet=n
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set -x
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;;
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break=*)
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break=${x#break=}
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;;
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break)
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break=premount
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;;
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blacklist=*)
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blacklist=${x#blacklist=}
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;;
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netconsole=*)
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netconsole=${x#netconsole=}
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;;
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BOOTIF=*)
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BOOTIF=${x#BOOTIF=}
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;;
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esac
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done
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if [ -n "${noresume}" ]; then
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export noresume
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unset resume
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else
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resume=${RESUME:-}
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fi
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[ -n "${netconsole}" ] && modprobe netconsole netconsole="${netconsole}"
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maybe_break top
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[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/init-top"
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run_scripts /scripts/init-top
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[ "$quiet" != "y" ] && log_end_msg
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maybe_break modules
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[ "$quiet" != "y" ] && log_begin_msg "Loading essential drivers"
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load_modules
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[ "$quiet" != "y" ] && log_end_msg
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maybe_break premount
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[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/init-premount"
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run_scripts /scripts/init-premount
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[ "$quiet" != "y" ] && log_end_msg
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maybe_break mount
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log_begin_msg "Mounting root file system"
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. /scripts/${BOOT}
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parse_numeric ${ROOT}
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maybe_break mountroot
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mountroot
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log_end_msg
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maybe_break bottom
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[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/init-bottom"
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run_scripts /scripts/init-bottom
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[ "$quiet" != "y" ] && log_end_msg
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# Move virtual filesystems over to the real filesystem
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mount -n -o move /sys ${rootmnt}/sys
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umount /proc
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validate_init() {
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checktarget="${1}"
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# Work around absolute symlinks
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if [ -d "${rootmnt}" ] && [ -h "${rootmnt}${checktarget}" ]; then
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case $(readlink "${rootmnt}${checktarget}") in /*)
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checktarget="$(chroot ${rootmnt} readlink ${checktarget})"
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;;
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esac
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fi
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# Make sure the specified init can be executed
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if [ ! -x "${rootmnt}${checktarget}" ]; then
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return 1
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fi
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# Upstart uses /etc/init as configuration directory :-/
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if [ -d "${rootmnt}${checktarget}" ]; then
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return 1
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fi
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}
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# Check init bootarg
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if [ -n "${init}" ]; then
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if ! validate_init "$init"; then
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echo "Target filesystem doesn't have requested ${init}."
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init=
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fi
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fi
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# Common case: /sbin/init is present
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if [ ! -x "${rootmnt}/sbin/init" ]; then
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# ... if it's not available search for valid init
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if [ -z "${init}" ] ; then
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for inittest in /sbin/init /etc/init /bin/init /bin/sh; do
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if validate_init "${inittest}"; then
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init="$inittest"
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break
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fi
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done
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fi
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# No init on rootmount
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if ! validate_init "${init}" ; then
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panic "No init found. Try passing init= bootarg."
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fi
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fi
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maybe_break init
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# don't leak too much of env - some init(8) don't clear it
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# (keep init, rootmnt)
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unset debug
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unset MODPROBE_OPTIONS
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unset DPKG_ARCH
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unset ROOTFLAGS
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unset ROOTFSTYPE
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unset ROOTDELAY
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unset ROOT
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unset IP
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unset BOOT
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unset BOOTIF
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unset UBIMTD
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unset blacklist
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unset break
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unset noresume
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unset panic
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unset quiet
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unset readonly
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unset resume
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unset resume_offset
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# Chain to real filesystem
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exec switch_root ${rootmnt} ${init} "$@"
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panic "Could not execute run-init."
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