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084c72e760
See https://www.debian.org/News/2016/20160425 and https://wiki.debian.org/LTS/Using for more details. > For Debian 7 "Wheezy" LTS there will be no requirement to add a separate wheezy-lts suite to your sources.list any more. In fact you will not notice the switch to LTS because after the official security support by the Debian Security Team ends, security updates will be provided via security.debian.org 's wheezy/updates. Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>
226 lines
8 KiB
Bash
Executable file
226 lines
8 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -e
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rootfsDir="$1"
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shift
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# we have to do a little fancy footwork to make sure "rootfsDir" becomes the second non-option argument to debootstrap
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before=()
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while [ $# -gt 0 ] && [[ "$1" == -* ]]; do
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before+=( "$1" )
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shift
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done
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suite="$1"
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shift
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# get path to "chroot" in our current PATH
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chrootPath="$(type -P chroot)"
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rootfs_chroot() {
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# "chroot" doesn't set PATH, so we need to set it explicitly to something our new debootstrap chroot can use appropriately!
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# set PATH and chroot away!
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PATH='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin' \
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"$chrootPath" "$rootfsDir" "$@"
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}
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# allow for DEBOOTSTRAP=qemu-debootstrap ./mkimage.sh ...
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: ${DEBOOTSTRAP:=debootstrap}
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(
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set -x
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$DEBOOTSTRAP "${before[@]}" "$suite" "$rootfsDir" "$@"
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)
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# now for some Docker-specific tweaks
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# prevent init scripts from running during install/update
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echo >&2 "+ echo exit 101 > '$rootfsDir/usr/sbin/policy-rc.d'"
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cat > "$rootfsDir/usr/sbin/policy-rc.d" <<-'EOF'
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#!/bin/sh
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# For most Docker users, "apt-get install" only happens during "docker build",
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# where starting services doesn't work and often fails in humorous ways. This
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# prevents those failures by stopping the services from attempting to start.
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exit 101
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EOF
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chmod +x "$rootfsDir/usr/sbin/policy-rc.d"
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# prevent upstart scripts from running during install/update
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(
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set -x
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rootfs_chroot dpkg-divert --local --rename --add /sbin/initctl
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cp -a "$rootfsDir/usr/sbin/policy-rc.d" "$rootfsDir/sbin/initctl"
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sed -i 's/^exit.*/exit 0/' "$rootfsDir/sbin/initctl"
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)
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# shrink a little, since apt makes us cache-fat (wheezy: ~157.5MB vs ~120MB)
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( set -x; rootfs_chroot apt-get clean )
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# this file is one APT creates to make sure we don't "autoremove" our currently
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# in-use kernel, which doesn't really apply to debootstraps/Docker images that
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# don't even have kernels installed
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rm -f "$rootfsDir/etc/apt/apt.conf.d/01autoremove-kernels"
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# Ubuntu 10.04 sucks... :)
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if strings "$rootfsDir/usr/bin/dpkg" | grep -q unsafe-io; then
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# force dpkg not to call sync() after package extraction (speeding up installs)
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echo >&2 "+ echo force-unsafe-io > '$rootfsDir/etc/dpkg/dpkg.cfg.d/docker-apt-speedup'"
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cat > "$rootfsDir/etc/dpkg/dpkg.cfg.d/docker-apt-speedup" <<-'EOF'
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# For most Docker users, package installs happen during "docker build", which
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# doesn't survive power loss and gets restarted clean afterwards anyhow, so
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# this minor tweak gives us a nice speedup (much nicer on spinning disks,
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# obviously).
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force-unsafe-io
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EOF
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fi
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if [ -d "$rootfsDir/etc/apt/apt.conf.d" ]; then
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# _keep_ us lean by effectively running "apt-get clean" after every install
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aptGetClean='"rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true";'
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echo >&2 "+ cat > '$rootfsDir/etc/apt/apt.conf.d/docker-clean'"
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cat > "$rootfsDir/etc/apt/apt.conf.d/docker-clean" <<-EOF
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# Since for most Docker users, package installs happen in "docker build" steps,
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# they essentially become individual layers due to the way Docker handles
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# layering, especially using CoW filesystems. What this means for us is that
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# the caches that APT keeps end up just wasting space in those layers, making
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# our layers unnecessarily large (especially since we'll normally never use
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# these caches again and will instead just "docker build" again and make a brand
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# new image).
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# Ideally, these would just be invoking "apt-get clean", but in our testing,
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# that ended up being cyclic and we got stuck on APT's lock, so we get this fun
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# creation that's essentially just "apt-get clean".
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DPkg::Post-Invoke { ${aptGetClean} };
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APT::Update::Post-Invoke { ${aptGetClean} };
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Dir::Cache::pkgcache "";
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Dir::Cache::srcpkgcache "";
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# Note that we do realize this isn't the ideal way to do this, and are always
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# open to better suggestions (https://github.com/docker/docker/issues).
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EOF
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# remove apt-cache translations for fast "apt-get update"
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echo >&2 "+ echo Acquire::Languages 'none' > '$rootfsDir/etc/apt/apt.conf.d/docker-no-languages'"
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cat > "$rootfsDir/etc/apt/apt.conf.d/docker-no-languages" <<-'EOF'
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# In Docker, we don't often need the "Translations" files, so we're just wasting
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# time and space by downloading them, and this inhibits that. For users that do
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# need them, it's a simple matter to delete this file and "apt-get update". :)
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Acquire::Languages "none";
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EOF
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echo >&2 "+ echo Acquire::GzipIndexes 'true' > '$rootfsDir/etc/apt/apt.conf.d/docker-gzip-indexes'"
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cat > "$rootfsDir/etc/apt/apt.conf.d/docker-gzip-indexes" <<-'EOF'
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# Since Docker users using "RUN apt-get update && apt-get install -y ..." in
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# their Dockerfiles don't go delete the lists files afterwards, we want them to
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# be as small as possible on-disk, so we explicitly request "gz" versions and
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# tell Apt to keep them gzipped on-disk.
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# For comparison, an "apt-get update" layer without this on a pristine
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# "debian:wheezy" base image was "29.88 MB", where with this it was only
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# "8.273 MB".
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Acquire::GzipIndexes "true";
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Acquire::CompressionTypes::Order:: "gz";
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EOF
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# update "autoremove" configuration to be aggressive about removing suggests deps that weren't manually installed
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echo >&2 "+ echo Apt::AutoRemove::SuggestsImportant 'false' > '$rootfsDir/etc/apt/apt.conf.d/docker-autoremove-suggests'"
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cat > "$rootfsDir/etc/apt/apt.conf.d/docker-autoremove-suggests" <<-'EOF'
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# Since Docker users are looking for the smallest possible final images, the
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# following emerges as a very common pattern:
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# RUN apt-get update \
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# && apt-get install -y <packages> \
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# && <do some compilation work> \
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# && apt-get purge -y --auto-remove <packages>
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# By default, APT will actually _keep_ packages installed via Recommends or
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# Depends if another package Suggests them, even and including if the package
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# that originally caused them to be installed is removed. Setting this to
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# "false" ensures that APT is appropriately aggressive about removing the
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# packages it added.
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# https://aptitude.alioth.debian.org/doc/en/ch02s05s05.html#configApt-AutoRemove-SuggestsImportant
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Apt::AutoRemove::SuggestsImportant "false";
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EOF
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fi
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if [ -z "$DONT_TOUCH_SOURCES_LIST" ]; then
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# tweak sources.list, where appropriate
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lsbDist=
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if [ -z "$lsbDist" -a -r "$rootfsDir/etc/os-release" ]; then
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lsbDist="$(. "$rootfsDir/etc/os-release" && echo "$ID")"
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fi
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if [ -z "$lsbDist" -a -r "$rootfsDir/etc/lsb-release" ]; then
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lsbDist="$(. "$rootfsDir/etc/lsb-release" && echo "$DISTRIB_ID")"
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fi
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if [ -z "$lsbDist" -a -r "$rootfsDir/etc/debian_version" ]; then
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lsbDist='Debian'
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fi
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# normalize to lowercase for easier matching
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lsbDist="$(echo "$lsbDist" | tr '[:upper:]' '[:lower:]')"
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case "$lsbDist" in
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debian)
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# updates and security!
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if [ "$suite" != 'sid' -a "$suite" != 'unstable' ]; then
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(
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set -x
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sed -i "
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p;
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s/ $suite / ${suite}-updates /
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" "$rootfsDir/etc/apt/sources.list"
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echo "deb http://security.debian.org $suite/updates main" >> "$rootfsDir/etc/apt/sources.list"
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)
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fi
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;;
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ubuntu)
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# add the updates and security repositories
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(
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set -x
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sed -i "
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p;
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s/ $suite / ${suite}-updates /; p;
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s/ $suite-updates / ${suite}-security /
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" "$rootfsDir/etc/apt/sources.list"
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)
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;;
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tanglu)
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# add the updates repository
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if [ "$suite" != 'devel' ]; then
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(
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set -x
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sed -i "
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p;
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s/ $suite / ${suite}-updates /
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" "$rootfsDir/etc/apt/sources.list"
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)
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fi
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;;
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steamos)
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# add contrib and non-free if "main" is the only component
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(
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set -x
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sed -i "s/ $suite main$/ $suite main contrib non-free/" "$rootfsDir/etc/apt/sources.list"
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)
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;;
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esac
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fi
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(
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set -x
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# make sure we're fully up-to-date
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rootfs_chroot sh -xc 'apt-get update && apt-get dist-upgrade -y'
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# delete all the apt list files since they're big and get stale quickly
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rm -rf "$rootfsDir/var/lib/apt/lists"/*
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# this forces "apt-get update" in dependent images, which is also good
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mkdir "$rootfsDir/var/lib/apt/lists/partial" # Lucid... "E: Lists directory /var/lib/apt/lists/partial is missing."
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)
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