Config apt inside docker images to save disk space: auto clean, gz, no trans (#69)

Author: qiluo-msft

ThirdPartyLicenses.txt

@@ -976,3 +976,197 @@ Microsoft is offering you a license to use the following components, to the exte
  * Public License instead of this License.  But first, please read
  * <http://www.gnu.org/philosophy/why-not-lgpl.html>.
  */
+
+4. apt-clean, apt-gzip-indexes, apt-no-languages imported from docker v1.11.1
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build_debian.sh

@@ -91,7 +91,7 @@ sudo LANG=C chroot $FILESYSTEM_ROOT mount sysfs /sys -t sysfs
 
 ## Pointing apt to public apt mirrors and getting latest packages, needed for latest security updates
 sudo cp files/apt/sources.list $FILESYSTEM_ROOT/etc/apt/
-sudo cp files/apt/apt.conf.d/81norecommends $FILESYSTEM_ROOT/etc/apt/apt.conf.d/
+sudo cp files/apt/apt.conf.d/{81norecommends,apt-{clean,gzip-indexes,no-languages}} $FILESYSTEM_ROOT/etc/apt/apt.conf.d/
 sudo LANG=C chroot $FILESYSTEM_ROOT bash -c 'apt-mark auto `apt-mark showmanual`'
 
 ## Note: set lang to prevent locale warnings in your chroot

files/apt/apt.conf.d/apt-clean

@@ -0,0 +1,19 @@
+# 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 { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };
+APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };
+
+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/docker/docker/issues).

files/apt/apt.conf.d/apt-gzip-indexes

@@ -0,0 +1,11 @@
+# Since Docker users using "RUN apt-get update && apt-get install -y ..." in
+# their Dockerfiles don't go delete the lists files afterwards, we want them to
+# be as small as possible on-disk, so we explicitly request "gz" versions and
+# tell Apt to keep them gzipped on-disk.
+
+# For comparison, an "apt-get update" layer without this on a pristine
+# "debian:wheezy" base image was "29.88 MB", where with this it was only
+# "8.273 MB".
+
+Acquire::GzipIndexes "true";
+Acquire::CompressionTypes::Order:: "gz";

files/apt/apt.conf.d/apt-no-languages

@@ -0,0 +1,5 @@
+# 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";