josch/mmdebstrap
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hooks/eatmydata: download instead of copy-ing from host

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This commit is contained in:
Johannes 'josch' Schauer 2020-08-17 19:01:27 +02:00
parent 95400ee1e2
commit 05d8b5f253
Signed by: josch
GPG key ID: F2CBA5C78FBD83E1
3 changed files with 72 additions and 5 deletions
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5
hooks/eatmydata/README.txt Normal file
View file

@ -0,0 +1,5 @@
Adding this directory with --hook-directory will result in mmdebstrap using
dpkg inside an eatmydata wrapper script. This will result in spead-ups on
systems where sync() takes some time. Using --dpkgopt=force-unsafe-io will have
a lesser effect compared to eatmydata. See:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=613428

15
hooks/eatmydata/customize.sh
View file

@ -4,7 +4,22 @@ set -exu
rootdir="$1"
if [ -e "$rootdir/var/lib/dpkg/arch" ]; then
chrootarch=$(head -1 "$rootdir/var/lib/dpkg/arch")
else
chrootarch=$(dpkg --print-architecture)
fi
libdir="/usr/lib/$(dpkg-architecture -a $chrootarch -q DEB_HOST_MULTIARCH)"
# if eatmydata was actually installed properly, then we are not removing
# anything here
if ! chroot "$rootdir" dpkg-query --list eatmydata; then
rm "$rootdir/usr/bin/eatmydata"
fi
if ! chroot "$rootdir" dpkg-query --list libeatmydata1; then
rm "$rootdir$libdir"/libeatmydata.so*
fi
mv "$rootdir/usr/bin/dpkg.orig" "$rootdir/usr/bin/dpkg"
sync

53
hooks/eatmydata/extract.sh
View file

@ -4,10 +4,57 @@ set -exu
rootdir="$1"
libdir="/usr/lib/$(dpkg-architecture -q DEB_HOST_MULTIARCH)"
if [ -e "$rootdir/var/lib/dpkg/arch" ]; then
chrootarch=$(head -1 "$rootdir/var/lib/dpkg/arch")
else
chrootarch=$(dpkg --print-architecture)
fi
eval $(apt-config shell trusted Dir::Etc::trusted/f)
eval $(apt-config shell trustedparts Dir::Etc::trustedparts/d)
tmpfile=$(mktemp --tmpdir="$rootdir/tmp")
cat << END > "$tmpfile"
Apt::Architecture "$chrootarch";
Apt::Architectures "$chrootarch";
Dir "$rootdir";
Dir::Etc::Trusted "$trusted";
Dir::Etc::TrustedParts "$trustedparts";
END
# we run "apt-get download --print-uris" in a temporary directory, to make sure
# that the packages do not already exist in the current directory, or otherwise
# nothing will be printed for them
tmpdir=$(mktemp --directory --tmpdir="$rootdir/tmp")
env --chdir="$tmpdir" APT_CONFIG="$tmpfile" apt-get download --print-uris eatmydata libeatmydata1 \
| sed -ne "s/^'\([^']\+\)'\s\+\([^\s]\+\)\s\+\([0-9]\+\)\s\+\(SHA256:[a-f0-9]\+\)$/\1 \2 \3 \4/p" \
| while read uri fname size hash; do
echo "processing $fname" >&2
if [ -e "$tmpdir/$fname" ]; then
echo "$tmpdir/$fname already exists" >&2
exit 1
fi
env --chdir="$tmpdir" APT_CONFIG="$tmpfile" /usr/lib/apt/apt-helper download-file "$uri" "$fname" Checksum-FileSize:"$size" "$hash"
case "$fname" in
eatmydata_*_all.deb)
mkdir -p "$rootdir/usr/bin"
dpkg-deb --fsys-tarfile "$tmpdir/$fname" \
| tar --directory="$rootdir/usr/bin" --strip-components=3 --extract --verbose ./usr/bin/eatmydata
;;
libeatmydata1_*_$chrootarch.deb)
libdir="/usr/lib/$(dpkg-architecture -a $chrootarch -q DEB_HOST_MULTIARCH)"
mkdir -p "$rootdir$libdir"
cp -a $libdir/libeatmydata* "$rootdir$libdir"
cp -a /usr/bin/eatmydata "$rootdir/usr/bin"
dpkg-deb --fsys-tarfile "$tmpdir/$fname" \
| tar --directory="$rootdir$libdir" --strip-components=4 --extract --verbose --wildcards ".$libdir/libeatmydata.so*"
;;
*)
echo "unexpected filename: $fname" >&2
exit 1
;;
esac
rm "$tmpdir/$fname"
done
rm "$tmpfile"
rmdir "$tmpdir"
mv "$rootdir/usr/bin/dpkg" "$rootdir/usr/bin/dpkg.orig"
cat << END > "$rootdir/usr/bin/dpkg"
#!/bin/sh