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moby--moby/contrib/mkimage/debootstrap

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#!/usr/bin/env bash
set -e
rootfsDir="$1"
shift
# we have to do a little fancy footwork to make sure "rootfsDir" becomes the second non-option argument to debootstrap
before=()
while [ $# -gt 0 ] && [[ "$1" == -* ]]; do
before+=( "$1" )
shift
done
suite="$1"
shift
(
set -x
debootstrap "${before[@]}" "$suite" "$rootfsDir" "$@"
)
# now for some Docker-specific tweaks
# prevent init scripts from running during install/update
echo >&2 "+ echo exit 101 > '$rootfsDir/usr/sbin/policy-rc.d'"
cat > "$rootfsDir/usr/sbin/policy-rc.d" <<'EOF'
#!/bin/sh
# For most Docker users, "apt-get install" only happens during "docker build",
# where starting services doesn't work and often fails in humorous ways. This
# prevents those failures by stopping the services from attempting to start.
exit 101
EOF
chmod +x "$rootfsDir/usr/sbin/policy-rc.d"
# prevent upstart scripts from running during install/update
(
set -x
chroot "$rootfsDir" dpkg-divert --local --rename --add /sbin/initctl
cp -a "$rootfsDir/usr/sbin/policy-rc.d" "$rootfsDir/sbin/initctl"
sed -i 's/^exit.*/exit 0/' "$rootfsDir/sbin/initctl"
)
# shrink a little, since apt makes us cache-fat (wheezy: ~157.5MB vs ~120MB)
( set -x; chroot "$rootfsDir" apt-get clean )
# Ubuntu 10.04 sucks... :)
if strings "$rootfsDir/usr/bin/dpkg" | grep -q unsafe-io; then
# force dpkg not to call sync() after package extraction (speeding up installs)
echo >&2 "+ echo force-unsafe-io > '$rootfsDir/etc/dpkg/dpkg.cfg.d/docker-apt-speedup'"
cat > "$rootfsDir/etc/dpkg/dpkg.cfg.d/docker-apt-speedup" <<-'EOF'
# For most Docker users, package installs happen during "docker build", which
# doesn't survive power loss and gets restarted clean afterwards anyhow, so
# this minor tweak gives us a nice speedup (much nicer on spinning disks,
# obviously).
force-unsafe-io
EOF
fi
if [ -d "$rootfsDir/etc/apt/apt.conf.d" ]; then
# _keep_ us lean by effectively running "apt-get clean" after every install
aptGetClean='"rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true";'
echo >&2 "+ cat > '$rootfsDir/etc/apt/apt.conf.d/docker-clean'"
cat > "$rootfsDir/etc/apt/apt.conf.d/docker-clean" <<-EOF
# Since for most Docker users, package installs happen in "docker build" steps,
# they essentially become individual layers due to the way Docker handles
# layering, especially using CoW filesystems. What this means for us is that
# the caches that APT keeps end up just wasting space in those layers, making
# our layers unnecessarily large (especially since we'll normally never use
# these caches again and will instead just "docker build" again and make a brand
# new image).
# Ideally, these would just be invoking "apt-get clean", but in our testing,
# that ended up being cyclic and we got stuck on APT's lock, so we get this fun
# creation that's essentially just "apt-get clean".
DPkg::Post-Invoke { ${aptGetClean} };
APT::Update::Post-Invoke { ${aptGetClean} };
Dir::Cache::pkgcache "";
Dir::Cache::srcpkgcache "";
# Note that we do realize this isn't the ideal way to do this, and are always
# open to better suggestions (https://github.com/dotcloud/docker/issues).
EOF
# remove apt-cache translations for fast "apt-get update"
echo >&2 "+ echo Acquire::Languages 'none' > '$rootfsDir/etc/apt/apt.conf.d/docker-no-languages'"
cat > "$rootfsDir/etc/apt/apt.conf.d/docker-no-languages" <<-'EOF'
# In Docker, we don't often need the "Translations" files, so we're just wasting
# time and space by downloading them, and this inhibits that. For users that do
# need them, it's a simple matter to delete this file and "apt-get update". :)
Acquire::Languages "none";
EOF
fi
if [ -z "$DONT_TOUCH_SOURCES_LIST" ]; then
# tweak sources.list, where appropriate
lsbDist=
if [ -z "$lsbDist" -a -r "$rootfsDir/etc/os-release" ]; then
lsbDist="$(. "$rootfsDir/etc/os-release" && echo "$ID")"
fi
if [ -z "$lsbDist" -a -r "$rootfsDir/etc/lsb-release" ]; then
lsbDist="$(. "$rootfsDir/etc/lsb-release" && echo "$DISTRIB_ID")"
fi
if [ -z "$lsbDist" -a -r "$rootfsDir/etc/debian_version" ]; then
lsbDist='Debian'
fi
# normalize to lowercase for easier matching
lsbDist="$(echo "$lsbDist" | tr '[:upper:]' '[:lower:]')"
case "$lsbDist" in
debian)
# updates and security!
if [ "$suite" != 'sid' -a "$suite" != 'unstable' ]; then
(
set -x
sed -i "
p;
s/ $suite / ${suite}-updates /
" "$rootfsDir/etc/apt/sources.list"
echo "deb http://security.debian.org $suite/updates main" >> "$rootfsDir/etc/apt/sources.list"
# LTS
if [ "$suite" = 'squeeze' ]; then
head -1 "$rootfsDir/etc/apt/sources.list" \
| sed "s/ $suite / ${suite}-lts /" \
>> "$rootfsDir/etc/apt/sources.list"
fi
)
fi
;;
ubuntu)
# add the updates and security repositories
(
set -x
sed -i "
p;
s/ $suite / ${suite}-updates /; p;
s/ $suite-updates / ${suite}-security /
" "$rootfsDir/etc/apt/sources.list"
)
;;
tanglu)
# add the updates repository
if [ "$suite" != 'devel' ]; then
(
set -x
sed -i "
p;
s/ $suite / ${suite}-updates /
" "$rootfsDir/etc/apt/sources.list"
)
fi
;;
steamos)
# add contrib and non-free if "main" is the only component
(
set -x
sed -i "s/ $suite main$/ $suite main contrib non-free/" "$rootfsDir/etc/apt/sources.list"
)
;;
esac
fi
(
set -x
# make sure we're fully up-to-date
chroot "$rootfsDir" bash -c 'apt-get update && apt-get dist-upgrade -y'
# delete all the apt list files since they're big and get stale quickly
rm -rf "$rootfsDir/var/lib/apt/lists"/*
# this forces "apt-get update" in dependent images, which is also good
)