1 files changed, 75 insertions, 0 deletions
diff --git a/hooks/eatmydata/extract.sh b/hooks/eatmydata/extract.sh
new file mode 100755
index 0000000..7ffe8e5
--- /dev/null
+++ b/hooks/eatmydata/extract.sh
@@ -0,0 +1,75 @@
+#!/bin/sh
+
+set -eu
+
+if [ "${MMDEBSTRAP_VERBOSITY:-1}" -ge 3 ]; then
+	set -x
+fi
+
+rootdir="$1"
+
+if [ -e "$rootdir/var/lib/dpkg/arch" ]; then
+	chrootarch=$(head -1 "$rootdir/var/lib/dpkg/arch")
+else
+	chrootarch=$(dpkg --print-architecture)
+fi
+
+trusted=
+eval "$(apt-config shell trusted Dir::Etc::trusted/f)"
+trustedparts=
+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 -r uri fname size hash; do
+		echo "processing $fname" >&2
+		if [ -e "$tmpdir/$fname" ]; then
+			echo "$tmpdir/$fname already exists" >&2
+			exit 1
+		fi
+		[ -z "$hash" ] && hash="Checksum-FileSize:$size"
+		env --chdir="$tmpdir" APT_CONFIG="$tmpfile" /usr/lib/apt/apt-helper download-file "$uri" "$fname" "$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"
+				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" "$rootdir/usr/bin/dpkg.distrib"
+cat << END > "$rootdir/usr/bin/dpkg"
+#!/bin/sh
+exec /usr/bin/eatmydata /usr/bin/dpkg.distrib "\$@"
+END
+chmod +x "$rootdir/usr/bin/dpkg"
+cat << END  >> "$rootdir/var/lib/dpkg/diversions"
+/usr/bin/dpkg
+/usr/bin/dpkg.distrib
+:
+END