mmdebstrap/make_mirror.sh

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#!/bin/sh
set -eu
mirrordir="./mirror"
mirror="http://deb.debian.org/debian"
nativearch=$(dpkg --print-architecture)
components=main
if [ -e "$mirrordir/dists/unstable/Release" ]; then
http_code=$(curl --output /dev/null --silent --location --head --time-cond "$mirrordir/dists/unstable/Release" --write-out '%{http_code}' "$mirror/dists/unstable/Release")
case "$http_code" in
200) ;; # need update
304) echo up-to-date; exit 0;;
*) echo unexpected status: $http_code; exit 1;;
esac
fi
for dist in stable testing unstable; do
rootdir=$(mktemp --directory)
for p in /etc/apt/apt.conf.d /etc/apt/sources.list.d /etc/apt/preferences.d /var/cache/apt /var/lib/apt/lists/partial /var/lib/dpkg; do
mkdir -p "$rootdir/$p"
done
cat << END > "$rootdir/etc/apt/apt.conf"
Apt::Architecture "$nativearch";
Dir::Etc "$rootdir/etc/apt";
Dir::State "$rootdir/var/lib/apt";
Dir::Cache "$rootdir/var/cache/apt";
Apt::Install-Recommends false;
Apt::Get::Download-Only true;
Dir::Etc::Trusted "/etc/apt/trusted.gpg";
Dir::Etc::TrustedParts "/etc/apt/trusted.gpg.d";
END
> "$rootdir/var/lib/dpkg/status"
cat << END > "$rootdir/etc/apt/sources.list"
deb [arch=$nativearch] $mirror $dist $components
END
APT_CONFIG="$rootdir/etc/apt/apt.conf" apt-get update
pkgs=$(APT_CONFIG="$rootdir/etc/apt/apt.conf" apt-get indextargets \
--format '$(FILENAME)' 'Created-By: Packages' "Architecture: $nativearch" \
| xargs --delimiter='\n' /usr/lib/apt/apt-helper cat-file \
| grep-dctrl --no-field-names --show-field=Package --exact-match \
\( --field=Essential yes --or --field=Priority required \
--or --field=Priority important --or --field=Priority standard \))
pkgs="$(echo $pkgs) build-essential"
APT_CONFIG="$rootdir/etc/apt/apt.conf" apt-get --yes install $pkgs
# to be able to also test gpg verification, we need to create a mirror
mkdir -p "$mirrordir/dists/$dist/" "$mirrordir/dists/$dist/main/binary-$nativearch/"
curl --location "$mirror/dists/$dist/Release" > "$mirrordir/dists/$dist/Release"
curl --location "$mirror/dists/$dist/Release.gpg" > "$mirrordir/dists/$dist/Release.gpg"
curl --location "$mirror/dists/$dist/main/binary-$nativearch/Packages.gz" > "$mirrordir/dists/$dist/main/binary-$nativearch/Packages.gz"
# the deb files downloaded by apt must be moved to their right locations in the
# pool directory
#
# Instead of parsing the Packages file, we could also attempt to move the deb
# files ourselves to the appropriate pool directories. But that approach
# requires re-creating the heuristic by which the directory is chosen, requires
# stripping the epoch from the filename and will break once mirrors change.
# This way, it doesn't matter where the mirror ends up storing the package.
gzip -dc "$mirrordir/dists/$dist/main/binary-$nativearch/Packages.gz" \
| grep-dctrl --no-field-names --show-field=Package,Version,Architecture,Filename,MD5sum '' \
| paste -sd " \n" \
| while read name ver arch fname md5; do
dir="${fname%/*}"
basename="${fname##*/}"
# apt stores deb files with the colon encoded as %3a while
# mirrors do not contain the epoch at all #645895
case "$ver" in *:*) ver="${ver%%:*}%3a${ver#*:}";; esac
aptname="$rootdir/var/cache/apt/archives/${name}_${ver}_${arch}.deb"
if [ -e "$aptname" ]; then
# make sure that we found the right file by checking its hash
echo "$md5 $aptname" | md5sum --check
mkdir -p "$mirrordir/$dir"
mv "$aptname" "$mirrordir/$fname"
fi
done
rm "$rootdir/var/cache/apt/archives/lock"
rmdir "$rootdir/var/cache/apt/archives/partial"
# now the apt cache should be empty
if [ ! -z "$(ls -1qA "$rootdir/var/cache/apt/archives/")" ]; then
echo "/var/cache/apt/archives not empty"
exit 1
fi
rm -r "$rootdir"
done