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make_mirror.sh: only download new archives to save bandwidth

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Johannes 'josch' Schauer 2018-10-21 17:54:45 +02:00
parent 7412d5fbce
commit a45eb846f7
Signed by: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 38 additions and 1 deletions
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39
make_mirror.sh
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@ -27,7 +27,7 @@ done
for dist in stable testing unstable; do
rootdir=$(mktemp --directory)
for p in /etc/apt/apt.conf.d /etc/apt/sources.list.d /etc/apt/preferences.d /var/cache/apt /var/lib/apt/lists/partial /var/lib/dpkg; do
for p in /etc/apt/apt.conf.d /etc/apt/sources.list.d /etc/apt/preferences.d /var/cache/apt/archives /var/lib/apt/lists/partial /var/lib/dpkg; do
mkdir -p "$rootdir/$p"
done
@ -51,6 +51,34 @@ END
APT_CONFIG="$rootdir/etc/apt/apt.conf" apt-get update
> "$rootdir/oldaptnames"
# before downloading packages and before replacing the old Packages
# file, copy all old *.deb packages from the mirror to
# /var/cache/apt/archives so that apt will not re-download *.deb
# packages that we already have
if [ -e "$mirrordir/dists/$dist/main/binary-$nativearch/Packages.gz" ]; then
gzip -dc "$mirrordir/dists/$dist/main/binary-$nativearch/Packages.gz" \
| grep-dctrl --no-field-names --show-field=Package,Version,Architecture,Filename '' \
| paste -sd " \n" \
| while read name ver arch fname; do
if [ ! -e "$mirrordir/$fname" ]; then
continue
fi
# apt stores deb files with the colon encoded as %3a while
# mirrors do not contain the epoch at all #645895
case "$ver" in *:*) ver="${ver%%:*}%3a${ver#*:}";; esac
aptname="$rootdir/var/cache/apt/archives/${name}_${ver}_${arch}.deb"
# we have to cp and not mv because other
# distributions might still need this file
# we have to cp and not symlink because apt
# doesn't recognize symlinks
# we cannot do a hardlink because the two
# directories might be on different devices
cp -a "$mirrordir/$fname" "$aptname"
echo "$aptname" >> "$rootdir/oldaptnames"
done
fi
pkgs=$(APT_CONFIG="$rootdir/etc/apt/apt.conf" apt-get indextargets \
--format '$(FILENAME)' 'Created-By: Packages' "Architecture: $nativearch" \
| xargs --delimiter='\n' /usr/lib/apt/apt-helper cat-file \
@ -77,6 +105,7 @@ END
# requires re-creating the heuristic by which the directory is chosen, requires
# stripping the epoch from the filename and will break once mirrors change.
# This way, it doesn't matter where the mirror ends up storing the package.
> "$rootdir/newaptnames"
gzip -dc "$mirrordir/dists/$dist/main/binary-$nativearch/Packages.gz" \
| grep-dctrl --no-field-names --show-field=Package,Version,Architecture,Filename,MD5sum '' \
| paste -sd " \n" \
@ -92,11 +121,19 @@ END
echo "$md5 $aptname" | md5sum --check
mkdir -p "$mirrordir/$dir"
mv "$aptname" "$mirrordir/$fname"
echo "$aptname" >> "$rootdir/newaptnames"
fi
done
rm "$rootdir/var/cache/apt/archives/lock"
rmdir "$rootdir/var/cache/apt/archives/partial"
# remove all packages that were in the old Packages file but not in the
# new one anymore
sort "$rootdir/oldaptnames" > "$rootdir/tmp"
mv "$rootdir/tmp" "$rootdir/oldaptnames"
sort "$rootdir/newaptnames" > "$rootdir/tmp"
mv "$rootdir/tmp" "$rootdir/newaptnames"
comm -23 "$rootdir/oldaptnames" "$rootdir/newaptnames" | xargs --delimiter="\n" --no-run-if-empty rm
# now the apt cache should be empty
if [ ! -z "$(ls -1qA "$rootdir/var/cache/apt/archives/")" ]; then
echo "/var/cache/apt/archives not empty"