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Diffstat (limited to 'tools/chroot-here.sh')
| -rwxr-xr-x | tools/chroot-here.sh | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/tools/chroot-here.sh b/tools/chroot-here.sh new file mode 100755 index 0000000..b8721b3 --- /dev/null +++ b/tools/chroot-here.sh @@ -0,0 +1,219 @@ +#!/bin/bash + +# This is a personal script by tomboy64. +# Copyright 2016 tomboy64. +# Published under the BSD-3-Clause. + +# v1.0 + +function helpprint() { + echo + echo "Usage:" + echo "ARCH=(arm|arm64|x86|x86_64) chroot-here.sh STAGE3FILE" + echo "STAGE3FILE can be any stage3-tarball." + echo "ARCH must be one of arm, arm64, x86 or x86_64." + echo + echo "In general it may name any specific arch you have support for in /etc/binfmt.d." + echo "(In case you add more, DO NOT ADD YOUR HOSTS ARCH THERE!" + echo + echo "BEWARE: THIS SCRIPT GIVES THE CHOICE TO ERASE THE CWD!" + echo + exit 0 +} + +function quit() { + echo + echo -n "Fatal error: " + echo "$@" + exit 1 +} + +function cntdwn() { + local start=10 + if [[ $1 -ge 0 ]] + then + start=$1 + fi + echo + for i in $(seq "${start}" -1 0) + do + echo -n "${i} " + sleep 1s + done + echo +} + +function mountDir() { + local dir=$1 + echo -n "Checking ${dir} ... " + if [[ ! -d "./${dir}" ]] + then + echo -n "creating ... " + mkdir -p "${dir}" || quit "Creation of ${dir} failed." + fi + if [[ $(mount | grep "${PWD}" | grep -c "${dir} type") -ge 1 ]] + then + echo "already mounted." + else + echo -n "mounting ... " + mount --bind "/${dir}" "${dir}" || quit "Couldn't mount ${dir}." + echo "done." + fi +} + +function umountDir() { + local dir=$1 + echo -n "Unmounting ${dir} ... " + umount "${PWD}/${dir}" 2&>/dev/null + echo "done." +} + +if [[ $(echo "$@" | grep -c "\-\-help") -gt 0 ]]; then + helpprint +fi + +case ${ARCH} in + arm) + ARCH_FULL=arm + ;; + arm64) + ARCH_FULL=aarch64 + ;; + x86) + ARCH_FULL=x86 + ;; + amd64) + ARCH_FULL=x86_64 + ;; + *) + quit "No suitable ARCH given: ${ARCH}." + ;; +esac + +STAGE3_PATH=$(dirname "$1") +STAGE3_FILE=$(basename "$1") + +# various preliminary checks +if [[ ${ARCH_FULL} == x86 || ${ARCH} == amd64 ]]; then + echo "No binfmt support necessary." +elif [[ $(mount | grep -c '^binfmt_misc') -eq 0 ]] +then + quit "binfmt_misc support missing." +elif [[ $(grep -c ":${ARCH_FULL}:" /etc/binfmt.d/*) -eq 0 ]] +then + quit "Can't find support for ${ARCH_FULL} in /etc/binfmt.d/." +elif [[ $(grep -c ":${ARCH_FULL}:" /etc/binfmt.d/*) -gt 1 ]] +then + quit "Support for ${ARCH_FULL} ambiguous in /etc/binfmt.d/." +else + QEMU_BIN=$(grep ":${ARCH_FULL}:" /etc/binfmt.d/* | awk -F ':' '{print $7}') +fi + +if [[ ${ARCH_FULL} == x86 || ${ARCH} == amd64 ]]; then + echo "No Qemu needed either." +elif [[ ! -f "${QEMU_BIN}" ]] +then + quit "Can't find ${QEMU_BIN}. Is it available?" +elif [[ $(LC_ALL=C ldd "${QEMU_BIN}" | grep -c "not a dynamic executable") -ne 1 ]] +then + quit "The qemu executable (${QEMU_BIN}) is not statically linked." +elif [[ ${PWD} == '/' ]] +then + quit "You a mad fella. Don't run this in '/'!" +fi + +if [[ ${EUID} -ne 0 ]] +then + quit "You need to run this as root." +fi + +if [[ -z "${STAGE3_PATH}" ]] +then + STAGE3_PATH="${PWD}" +fi +if [[ -z "${STAGE3_FILE}" ]] +then + echo -n "No stage3 given; attempt to locate newest available in ${STAGE3_PATH} ..." + STAGE3_FILE=$(basename "$(find "${STAGE3_PATH}" -name 'stage3-'"${ARCH}"'-*.tar.bz2' | sort -r | head -n1)") + echo " done." +fi +if [[ ! -f "${STAGE3_PATH}/${STAGE3_FILE}" ]] +then + echo "No stage3 available (${STAGE3_PATH}/${STAGE3_FILE})." +fi + +# MAKE SURE NONE OF THOSE PATHS IS PREPENDED WITH A /! +MOUNT_PATHS=( usr/portage proc sys dev dev/pts dev/shm ) + +#if [[ -d "./${ARCH}-chroot" ]] +#then + echo -n "Erase './'? [y/N] " + read -n1 -r response + if [[ "${response}" == "y" ]] + then + echo + + idx=$(( ${#MOUNT_PATHS[@]} - 1 )) + while [[ ${idx} -ge 0 ]] + do + umountDir "./${MOUNT_PATHS[idx]}" + idx=$(( idx - 1 )) + done + + if [[ $(mount | grep -c "${PWD}") -gt 0 ]] + then + quit "Not all mounts from ${PWD} removed." + fi + + if [[ $(find . | head -n2 | wc -l) -gt 1 ]]; then + echo -n "Erasing ... " + rm -r ./* || quit "Erasing ${PWD} failed." + echo "done." + fi + + #mkdir "${ARCH}-chroot" || quit "mkdir ${ARCH}-chroot" + #cd "${ARCH}-chroot" || quit "${ARCH}-chroot could not be entered." + #echo "Entered ${PWD}" + + if [[ -f "${STAGE3_PATH}/${STAGE3_FILE}" ]]; then + echo -n "Extracting stage3 ... " + tar xf "${STAGE3_PATH}/${STAGE3_FILE}" || quit "Extraction of ${STAGE3_PATH}/${STAGE3_FILE} failed." + echo "done." + fi + + fi +# else + +# cd "${ARCH}-chroot" || quit "${ARCH}-chroot could not be entered." +# echo "Entered ${PWD}" +# fi +#fi + + +for i in "${MOUNT_PATHS[@]}" +do + mountDir "${i}" +done + +cp -v /etc/resolv.conf etc/ || quit "Couldn't copy resolv.conf" +if [[ ${ARCH_FULL} != x86 && ${ARCH} != amd64 ]]; then + cp -v "${QEMU_BIN}" ".$(dirname "${QEMU_BIN}")" || quit "Couldn't copy qemu binary." +fi + cat <<EOF >> etc/portage/make.conf || quit "Couldn't write to etc/portage/make.conf." +MAKEOPTS="-j5" +EMERGE_DEFAULT_OPTS="--verbose --autounmask-write --nospinner --keep-going -j5 --load-average=5 --verbose-conflict" +PYTHON_SINGLE_TARGET="python3_4" +PYTHON_TARGETS="python2_7 python3_3 python3_4 python3_5 pypy pypy2" +EOF +if [[ ${ARCH_FULL} == x86 ]]; then + PS1="chroot${PS1}" linux32 chroot ./ /bin/bash --login || quit "Chrooting failed." +else + chroot ./ /bin/bash --login || quit "Chrooting failed." +fi + +idx=$(( ${#MOUNT_PATHS[@]}-1 )) +while [[ ${idx} -ge 0 ]] +do + umountDir "${MOUNT_PATHS[idx]}" + idx=$(( idx - 1 )) +done |