diff options
Diffstat (limited to 'mkinitrd')
| -rw-r--r-- | mkinitrd/initramfs-init.sh | 110 | ||||
| -rwxr-xr-x | mkinitrd/mkinitramfs.sh | 81 |
2 files changed, 191 insertions, 0 deletions
diff --git a/mkinitrd/initramfs-init.sh b/mkinitrd/initramfs-init.sh new file mode 100644 index 0000000..9353e0f --- /dev/null +++ b/mkinitrd/initramfs-init.sh @@ -0,0 +1,110 @@ +#!/bin/sh + +PATH=/bin:/usr/bin:/sbin:/usr/sbin +export PATH + +echo "Loading system..." + +problem() +{ + printf "Encountered a problem!\n\nDropping you to a shell.\n\n" + sh +} + +no_device() +{ + printf "The device %s, which is supposed to contain the\n" $1 + printf "root file system, does not exist.\n" + printf "Please fix this problem and exit this shell.\n\n" +} + +no_mount() +{ + printf "Could not mount device %s\n" $1 + printf "Sleeping forever. Please reboot and fix the kernel command line.\n\n" + printf "Maybe the device is formatted with an unsupported file system?\n\n" + printf "Or maybe filesystem type autodetection went wrong, in which case\n" + printf "you should add the rootfstype=... parameter to the kernel command line.\n\n" + printf "Available partitions:\n" +} + +do_mount_root() +{ + mkdir /.root + [ -n "$rootflags" ] && rootflags="$rootflags," + rootflags="$rootflags$ro" + + case "$root" in + /dev/* ) device=$root ;; + UUID=* ) eval $root; device="/dev/disk/by-uuid/$UUID" ;; + LABEL=*) eval $root; device="/dev/disk/by-label/$LABEL" ;; + "" ) echo "No root device specified." ; problem ;; + esac + + while [ ! -b "$device" ] ; do + no_device $device + problem + done + + if ! mount -n -t "$rootfstype" -o "$rootflags" "$device" /.root ; then + no_mount $device + cat /proc/partitions + while true ; do sleep 10000 ; done + else + echo "Successfully mounted device $root" + fi +} + +init=/sbin/init +root= +rootdelay= +rootfstype=auto +ro="ro" +rootflags= +device= + +mount -n -t devtmpfs devtmpfs /dev +mount -n -t proc proc /proc +mount -n -t sysfs sysfs /sys +mount -n -t tmpfs tmpfs /run + +read -r cmdline < /proc/cmdline + +for param in $cmdline ; do + case $param in + init=* ) init=${param#init=} ;; + root=* ) root=${param#root=} ;; + rootdelay=* ) rootdelay=${param#rootdelay=} ;; + rootfstype=*) rootfstype=${param#rootfstype=} ;; + rootflags=* ) rootflags=${param#rootflags=} ;; + ro ) ro="ro" ;; + rw ) ro="rw" ;; + esac +done + +# udevd location depends on version +if [ -x /sbin/udevd ]; then + UDEVD=/sbin/udevd +elif [ -x /lib/udev/udevd ]; then + UDEVD=/lib/udev/udevd +elif [ -x /lib/systemd/systemd-udevd ]; then + UDEVD=/lib/systemd/systemd-udevd +else + echo "Cannot find udevd nor systemd-udevd" + problem +fi + +${UDEVD} --daemon --resolve-names=never +udevadm trigger +udevadm settle + +if [ -f /etc/mdadm.conf ] ; then mdadm -As ; fi +if [ -x /sbin/vgchange ] ; then /sbin/vgchange -a y > /dev/null ; fi +if [ -n "$rootdelay" ] ; then sleep "$rootdelay" ; fi + +do_mount_root + +killall -w ${UDEVD##*/} + +exec switch_root /.root "$init" "$@" + diff --git a/mkinitrd/mkinitramfs.sh b/mkinitrd/mkinitramfs.sh new file mode 100755 index 0000000..9e32cee --- /dev/null +++ b/mkinitrd/mkinitramfs.sh @@ -0,0 +1,81 @@ +#!/bin/sh + +BUILD=/tmp/ramfs +OUT=${1-/boot/initramfs-linux.img} + + +# create base directory structure +printf "creating directories..." + +[ -e $BUILD ] && rm -rf $BUILD +mkdir -p $BUILD/tmp + +cd $BUILD +mkdir -p bin dev etc lib proc run sbin sys usr +mkdir -p lib/firmware lib/modules lib/udev +mkdir -p etc/modprobe.d etc/udev + +ln -s lib lib64 +ln -s ../bin usr/bin +ln -s ../sbin usr/sbin +printf "OK\n" + +# copy binaries +printf "populating /bin..." +for b in dash cat cp dd killall kmod ln ls mkdir \ + mknod mount rm sed sleep umount uname \ + basename readlink printf echo udevadm; do + cp -a /bin/$b bin/ +done +ln -s dash bin/sh +ln -s kmod bin/insmod +ln -s kmod bin/lsmod +printf "OK\n" + +# create nodes for udev to mount +printf "creating nodes..." +mknod -m 600 dev/console c 5 1 +mknod -m 666 dev/null c 1 3 +printf "OK\n" + +# Copy udev configuration +printf "configuring udev..." +cp /etc/udev/udev.conf etc/udev/ +cp -r /etc/udev/rules.d etc/udev/ +cp -r /lib/udev/* lib/udev/ +printf "OK\n" + +# set module order +touch etc/modprobe.d/modprobe.conf + +# copy the init script +printf "installing init script..." +cp /sbin/initramfs-init sbin/init +printf "OK\n" + +# copy required libraries +printf "populating /lib..." +for l in c acl attr blkid cap kmod lzma mount ncursesw readline z curses history zstd; do + cp /lib/lib$l.so lib/ +done +ln -s libc.so /ld-musl-$(uname -m).so.1 +printf "OK\n" + +# copy any firmware +[ -d /lib/firmware ] && { + printf "installing firmware..." + cp -r /lib/firmware/* lib/firmware/ + printf "OK\n" +} + +# copy any modules +printf "installing modules..." +cp -r /lib/modules/* lib/modules/ +printf "OK\n" + +# create the initramfs image +printf "creating initramfs image..." +find ./ | cpio -o -H newc | gzip -9 > $OUT +printf "OK\n" + +printf "Written initramfs image to $OUT\n" |