Initial cut of a script that installs chroot environment. This can for
example be used to have an accurate 32bit build and test environment when otherwise working on a 64bit machine. This script only works on Debian-derived systems. BUG=none TEST=none Review URL: http://codereview.chromium.org/3272004 git-svn-id: http://src.chromium.org/svn/trunk/src/build@57962 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
This commit is contained in:
markus@chromium.org
Родитель
b96736f6b2
Коммит
4ea399d5fa
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#!/bin/bash -e
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# Copyright (c) 2010 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# This script installs Debian-derived distributions in a chroot environment.
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# It can for example be used to have an accurate 32bit build and test
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# environment when otherwise working on a 64bit machine.
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# N. B. it is unlikely that this script will ever work on anything other than a
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# Debian-derived system.
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# Check that we are running as a regular user
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[ "$(id -nu)" = root ] && {
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echo "Run this script as a regular user and provide your \"sudo\"" \
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"password if requested" >&2
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exit 1
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}
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mkdir -p "$HOME/chroot/"
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# Error handler
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trap 'exit 1' INT TERM QUIT
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trap 'sudo apt-get clean; tput bel; echo; echo Failed' EXIT
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# Install any missing applications that this script relies on. If these packages
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# are already installed, don't force another "apt-get install". That would
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# prevent them from being auto-removed, if they ever become eligible for that.
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# And as this script only needs the packages once, there is no good reason to
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# introduce a hard dependency on things such as dchroot and debootstrap.
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dep=
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for i in dchroot debootstrap; do
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[ -d /usr/share/doc/"$i" ] || dep="$dep $i"
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done
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[ -n "$dep" ] && sudo apt-get -y install $dep
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sudo apt-get -y install schroot
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# Create directory for chroot
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sudo mkdir -p /var/lib/chroot
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# Find chroot environments that can be installed with debootstrap
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targets="$(cd /usr/share/debootstrap/scripts
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ls | grep '^[a-z]*$')"
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# Ask user to pick one of the available targets
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echo "The following targets are available to be installed in a chroot:"
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j=1; for i in $targets; do
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printf '%4d: %s\n' "$j" "$i"
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j=$(($j+1))
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done
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while :; do
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printf "Which target would you like to install: "
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read n
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[ "$n" -gt 0 -a "$n" -lt "$j" ] >&/dev/null && break
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done
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j=1; for i in $targets; do
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[ "$j" -eq "$n" ] && { distname="$i"; break; }
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j=$(($j+1))
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done
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# On x86-64, ask whether the user wants to install x86-32 or x86-64
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archflag=
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arch=
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if [ "$(uname -m)" = x86_64 ]; then
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while :; do
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echo "You are running a 64bit kernel. This allows you to install either a"
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printf "32bit or a 64bit chroot environment. %s" \
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"Which one do you want (32, 64) "
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read arch
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[ "${arch}" == 32 -o "${arch}" == 64 ] && break
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done
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[ "${arch}" == 32 ] && archflag="--arch i386" || archflag="--arch amd64"
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arch="${arch}bit"
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fi
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target="${distname}${arch}"
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# Don't overwrite an existing installation
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[ -d /var/lib/chroot/"${target}" ] && {
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echo "This chroot already exists on your machine." >&2
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echo "Delete /var/lib/chroot/${target} if you want to start over." >&2
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exit 1
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}
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sudo mkdir -p /var/lib/chroot/"${target}"
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# Remove stale entry from /etc/schroot/schroot.conf. Entries start
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# with the target name in square brackets, followed by an arbitrary
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# number of lines. The entry stops when either the end of file has
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# been reached, or when the beginning of a new target is encountered.
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# This means, we cannot easily match for a range of lines in
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# "sed". Instead, we actually have to iterate over each line and check
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# whether it is the beginning of a new entry.
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sudo sed -ni '/^[[]'"${target%bit}"']$/,${:1;n;/^[[]/b2;b1;:2;p;n;b2};p' \
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/etc/schroot/schroot.conf
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# Download base system. This takes some time
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grep ubuntu.com /usr/share/debootstrap/scripts/"${distname}" >&/dev/null &&
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mirror="http://archive.ubuntu.com/ubuntu" ||
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mirror="http://ftp.us.debian.org/debian"
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sudo debootstrap ${archflag} "${distname}" /var/lib/chroot/"${target}" \
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"$mirror"
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# Add new entry to /etc/schroot/schroot.conf
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grep ubuntu.com /usr/share/debootstrap/scripts/"${distname}" >&/dev/null &&
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brand="Ubuntu" || brand="Debian"
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sudo sh -c 'cat >>/etc/schroot/schroot.conf' <<EOF
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[${target%bit}]
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description=${brand} ${distname} ${arch}
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type=directory
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directory=/var/lib/chroot/${target}
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priority=3
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users=root
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groups=admin
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root-groups=admin
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personality=linux$([ "${arch}" != 64bit ] && echo 32)
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script-config=script-${target}
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EOF
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# Set up a special directory that changes contents depending on the target
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# that is executing.
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sed '/^FSTAB=/s,/mount-defaults",/mount-'"${target}"'",' \
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/etc/schroot/script-defaults |
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sudo sh -c 'cat >/etc/schroot/script-'"${target}"
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sudo cp /etc/schroot/mount-defaults /etc/schroot/mount-"${target}"
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echo "$HOME/chroot/.${target} $HOME/chroot none rw,bind 0 0" |
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sudo sh -c 'cat >>/etc/schroot/mount-'"${target}"
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mkdir -p "$HOME/chroot/.${target}"
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# Install a helper script to launch commands in the chroot
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sudo sh -c 'cat >/usr/local/bin/'"${target%bit}" <<EOF
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#!/bin/bash
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if [ \$# -eq 0 ]; then
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exec schroot -c ${target%bit} -p
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else
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p="\$1"; shift
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exec schroot -c ${target%bit} -p "\$p" -- "\$@"
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fi
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exit 1
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EOF
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sudo chown root:root /usr/local/bin/"${target%bit}"
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sudo chmod 755 /usr/local/bin/"${target%bit}"
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# Add a few more repositories to the chroot
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[ -r /var/lib/chroot/${target}/etc/apt/sources.list ] &&
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sudo sed -i 's/ main$/ main restricted universe multiverse/
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p
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t1
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d
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:1;s/^deb/deb-src/
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t
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d' /var/lib/chroot/${target}/etc/apt/sources.list
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# Update packages
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sudo schroot -c "${target%bit}" -p -- /bin/sh -c '
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apt-get update; apt-get -y dist-upgrade' || :
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# Install a couple of missing packages
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for i in debian-keyring ubuntu-keyring locales sudo; do
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[ -d "/var/lib/chroot/${target}/usr/share/doc/$i" ] ||
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sudo schroot -c "${target%bit}" -p -- apt-get -y install "$i" || :
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done
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# Configure locales
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sudo schroot -c "${target%bit}" -p -- /bin/sh -c '
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l='"${LANG:-en_US}"'; l="${l%%.*}"
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[ -r /etc/locale.gen ] &&
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sed -i "s/^# \($l\)/\1/" /etc/locale.gen
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locale-gen $LANG en_US en_US.UTF-8' || :
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# Configure "sudo" package
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sudo schroot -c "${target%bit}" -p -- /bin/sh -c '
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egrep '"'^$(id -nu) '"' /etc/sudoers >/dev/null 2>&1 ||
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echo '"'$(id -nu) ALL=(ALL) ALL'"' >>/etc/sudoers'
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# Install a few more commonly used packages
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sudo schroot -c "${target%bit}" -p -- apt-get -y install \
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autoconf automake1.9 dpkg-dev g++-multilib gcc-multilib gdb less libtool \
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strace
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# If running a 32bit environment on a 64bit machine, install a few binaries
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# as 64bit.
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if [ "${arch}" = 32bit ] && file /bin/bash 2>/dev/null | grep -q x86-64; then
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sudo schroot -c "${target%bit}" -p -- apt-get -y install \
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lib64expat1 lib64ncurses5 lib64readline6 lib64z1
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dep=
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for i in binutils gdb strace; do
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[ -d /usr/share/doc/"$i" ] || dep="$dep $i"
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done
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[ -n "$dep" ] && sudo apt-get -y install $dep
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sudo cp /usr/bin/gdb /var/lib/chroot/${target}/usr/local/bin/
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sudo cp /usr/bin/ld /var/lib/chroot/${target}/usr/local/bin/
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for i in libbfd libpython; do
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lib="$({ ldd /usr/bin/ld; ldd /usr/bin/gdb; } |
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grep "$i" | awk '{ print $3 }')"
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if [ -n "$lib" -a -r "$lib" ]; then
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sudo cp "$lib" /var/lib/chroot/${target}/usr/lib64/
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fi
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done
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for lib in libssl libcrypt; do
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sudo cp /usr/lib/$lib* /var/lib/chroot/${target}/usr/lib64/ || :
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done
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fi
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# Clean up package files
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sudo schroot -c "${target%bit}" -p -- apt-get clean
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sudo apt-get clean
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# Let the user know what we did
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trap '' INT TERM QUIT
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trap '' EXIT
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cat <<EOF
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Successfully installed ${distname} ${arch}
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You can run programs inside of the chroot by invoking the "${target%bit}"
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command.
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Your home directory is shared between the host and the chroot. But I configured
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$HOME/chroot to be private to the chroot environment. You can use it
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for files that need to differ between environments.
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EOF
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