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diff --git a/scripts/run_bisect.sh b/scripts/run_bisect.sh
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+#!/bin/sh
+#
+# Copyright 2020 Johannes Schauer Marin Rodrigues <josch@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# this script is part of debbisect and usually called by debbisect itself
+#
+# it accepts six or eight arguments:
+# 1. dependencies
+# 2. script name or shell snippet
+# 3. mirror URL
+# 4. architecture
+# 5. suite
+# 6. components
+# 7. (optional) second mirror URL
+# 8. (optional) package to upgrade
+#
+# It will create an ephemeral chroot using mmdebstrap using (3.) as mirror,
+# (4.) as architecture, (5.) as suite and (6.) as components, install the
+# dependencies given in (1.) and execute the script given in (2.).
+# Its output is the exit code of the script as well as a file ./pkglist
+# containing the output of "dpkg-query -W" inside the chroot.
+#
+# If not only six but eight arguments are given, then the second mirror URL
+# (7.) will be added to the apt sources and the single package (8.) will be
+# upgraded to its version from (7.).
+
+set -exu
+
+if [ $# -ne 6 ] && [ $# -ne 8 ]; then
+ echo "usage: $0 depends script mirror1 architecture suite components [mirror2 toupgrade]"
+ exit 1
+fi
+
+depends=$1
+script=$2
+mirror1=$3
+architecture=$4
+suite=$5
+components=$6
+
+if [ $# -eq 6 ]; then
+ mmdebstrap \
+ --verbose \
+ --aptopt='Acquire::Check-Valid-Until "false"' \
+ --variant=apt \
+ --components="$components" \
+ --include="$depends" \
+ --architecture="$architecture" \
+ --customize-hook='chroot "$1" sh -c "dpkg-query -W > /pkglist"' \
+ --customize-hook='download /pkglist ./debbisect.'"$DEBIAN_BISECT_TIMESTAMP"'.pkglist' \
+ --customize-hook='rm "$1"/pkglist' \
+ --customize-hook='chroot "$1" dpkg -l' \
+ --customize-hook="$script" \
+ "$suite" \
+ - \
+ "$mirror1" \
+ >/dev/null
+elif [ $# -eq 8 ]; then
+ mirror2=$7
+ toupgrade=$8
+ mmdebstrap \
+ --verbose \
+ --aptopt='Acquire::Check-Valid-Until "false"' \
+ --variant=apt \
+ --components="$components" \
+ --include="$depends" \
+ --architecture="$architecture" \
+ --customize-hook='echo "deb '"$mirror2 $suite $(echo "$components" | tr ',' ' ')"'" > "$1"/etc/apt/sources.list' \
+ --customize-hook='chroot "$1" apt-get update' \
+ --customize-hook='chroot "$1" env DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true apt-get --yes install --no-install-recommends '"$toupgrade" \
+ --customize-hook='chroot "$1" sh -c "dpkg-query -W > /pkglist"' \
+ --customize-hook='download /pkglist ./debbisect.'"$DEBIAN_BISECT_TIMESTAMP.$toupgrade"'.pkglist' \
+ --customize-hook='rm "$1"/pkglist' \
+ --customize-hook='chroot "$1" dpkg -l' \
+ --customize-hook="$script" \
+ "$suite" \
+ - \
+ "$mirror1" \
+ >/dev/null
+fi