#!/bin/sh
set -e

#---------------------------------------------------------------------
# Creates a sbuild chroot, builds a package, installs the resulting
# .deb, then runs the command provided by the .deb.
#---------------------------------------------------------------------

die()
{
    msg="$*"
    echo "ERROR: $msg" >&2
    exit 1
}

# The package we'll ask sbuild to build (we know its buildable since
# it's already in the archive :-)
#
# The advantage of choosing this particular package being that it runs
# *itself* at the end of its build.
pkg=procenv

resultdir=/var/cache/pbuilder/result

# Avoid conflict with ADT
unset TMPDIR

distro=$(lsb_release --id --short|tr '[A-Z]' '[a-z]' || :)
[ -z "$distro" ] && die "cannot establish distribution"

host_release=$(lsb_release --codename --short || :)
[ -z "$host_release" ] && die "cannot establish release running on host"

if [ "$distro" = debian ] ; then
    release=$(distro-info --testing)
    components="main"
    mirror="http://httpredir.debian.org/debian"
elif [ "$distro" = ubuntu ] ; then
    release=$(distro-info --devel)
    components="main universe"
    mirror="http://archive.ubuntu.com/ubuntu"
else
    die "need to know where archive is for distro '$distro'"
fi

# Have to redirect stderr to avoid ADT thinking the test has failed
# (the return code is still being checked, so this seems reasonable).
echo "INFO: Creating pbuilder chroot for release '$release'"
echo "+ pbuilder --create --debug --distribution $release --components '$components' --mirror '$mirror'"
pbuilder --create --debug \
    --distribution "$release" \
    --components "$components" \
    --mirror "$mirror" 2>&1

if [ ! -d "$resultdir" ] ; then
    die "cannot find directory $resultdir"
fi

# Use '--download-only' to avoid unpack which generates a
# signature warning to stderr, causing this test to fail.
echo "INFO: Downloading source for package '$pkg' release '$release'"
apt-get source --download-only "$pkg/$release"

dsc=$(ls ${pkg}*.dsc)

echo "INFO: Building package '$pkg' for release '$release' from '$dsc'"
pbuilder --build --debug "$dsc" 2>&1

arch=$(dpkg --print-architecture 2>/dev/null)
[ -z "$arch" ] && die "cannot establish architecture"

pkg_and_version=$(echo "$dsc"|sed 's/\.dsc$//g')
deb=${resultdir}/${pkg_and_version}_${arch}.deb

# Do what we can to check if the .deb looks usable (since we may not
# be able to install it to test it properly)
echo "INFO: Listing information on '$deb'"
dpkg --info "$deb"

echo "INFO: Listing contents of '$deb'"
dpkg --contents "$deb"

extract="$ADTTMP/extract"
echo "INFO: Extracting '$deb' to '$extract'"
dpkg --extract "$deb" "$extract"

echo "INFO: Trying to install package '$pkg' from '$deb'"
echo "INFO: (this might not succeed, that's not a bug)"
if dpkg -i "$deb" 2>&1 ; then
    # run the command to prove the build worked but also to expose the
    # auto-package-test environment used for this test.
    cmd=$pkg
    echo "INFO: Showing AutoPkgTest environment by running '$cmd' from package '$pkg'"
    "$cmd"
else
    echo "INFO: The install step failed. This can be expected if the host release is different than our target."
    echo "host release: $host_release"
    echo "target release: $release"
fi

echo "INFO: SUCCESS"