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Fix contrib/mkimage-debian.sh apt caching prevention

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Tianon Gravi 2013-09-28 06:37:29 -06:00
parent 31fd11860b
commit ee27444098
1 changed files with 22 additions and 5 deletions
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27
contrib/mkimage-debian.sh
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@ -10,12 +10,18 @@ variant='minbase'
include='iproute,iputils-ping'
repo="$1"
suite="${2:-$stableSuite}"
suite="$2"
mirror="${3:-}" # stick to the default debootstrap mirror if one is not provided
if [ ! "$repo" ]; then
echo >&2 "usage: $0 repo [suite [mirror]]"
if [ ! "$repo" ] || [ ! "$suite" ]; then
echo >&2 "usage: $0 repo suite [mirror]"
echo >&2
echo >&2 " ie: $0 tianon/debian squeeze"
echo >&2 " $0 tianon/debian squeeze http://ftp.uk.debian.org/debian/"
echo >&2
echo >&2 " ie: $0 tianon/ubuntu precise"
echo >&2 " $0 tianon/ubuntu precise http://mirrors.melbourne.co.uk/ubuntu/"
echo >&2
exit 1
fi
@ -33,8 +39,12 @@ sudo debootstrap --verbose --variant="$variant" --include="$include" "$suite" "$
cd "$target"
# prevent init scripts from running during install/update
# policy-rc.d (for most scripts)
echo $'#!/bin/sh\nexit 101' | sudo tee usr/sbin/policy-rc.d > /dev/null
sudo chmod +x usr/sbin/policy-rc.d
# initctl (for some pesky upstart scripts)
sudo chroot . dpkg-divert --local --rename --add /sbin/initctl
sudo ln -sf /bin/true sbin/initctl
# see https://github.com/dotcloud/docker/issues/446#issuecomment-16953173
# shrink the image, since apt makes us fat (wheezy: ~157.5MB vs ~120MB)
@ -42,9 +52,16 @@ sudo chroot . apt-get clean
# while we're at it, apt is unnecessarily slow inside containers
# this forces dpkg not to call sync() after package extraction and speeds up install
# the benefit is huge on spinning disks, and the penalty is nonexistent on SSD or decent server virtualization
echo 'force-unsafe-io' | sudo tee etc/dpkg/dpkg.cfg.d/02apt-speedup > /dev/null
# we don't need an apt cache in a container
echo 'Acquire::http {No-Cache=True;};' | sudo tee etc/apt/apt.conf.d/no-cache > /dev/null
# we want to effectively run "apt-get clean" after every install to keep images small
echo 'DPkg::Post-Invoke {"/bin/rm -f /var/cache/apt/archives/*.deb || true";};' | sudo tee etc/apt/apt.conf.d/no-cache > /dev/null
# helpful undo lines for each the above tweaks (for lack of a better home to keep track of them):
# rm /usr/sbin/policy-rc.d
# rm /sbin/initctl; dpkg-divert --rename --remove /sbin/initctl
# rm /etc/dpkg/dpkg.cfg.d/02apt-speedup
# rm /etc/apt/apt.conf.d/no-cache
# create the image (and tag $repo:$suite)
sudo tar -c . | docker import - $repo $suite