From 4b9ca5a62ef1e5ecc7d0cd74ac56311ec73a0f5c Mon Sep 17 00:00:00 2001
From: Holger Levsen <holger@layer-acht.org>
Date: Sun, 19 Oct 2014 00:27:04 +0200
Subject: reproducible: add locking for reproducible schroot creation (which
 happens daily)

---
 bin/reproducible_setup_schroot.sh | 118 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100755 bin/reproducible_setup_schroot.sh

(limited to 'bin/reproducible_setup_schroot.sh')

diff --git a/bin/reproducible_setup_schroot.sh b/bin/reproducible_setup_schroot.sh
new file mode 100755
index 00000000..70f40f5a
--- /dev/null
+++ b/bin/reproducible_setup_schroot.sh
@@ -0,0 +1,118 @@
+#!/bin/bash
+
+# Copyright 2012-2014 Holger Levsen <holger@layer-acht.org>
+# Copyright      2013 Antonio Terceiro <terceiro@debian.org>
+# Copyright      2014 Joachim Breitner <nomeata@debian.org>
+# released under the GPLv=2
+
+. /srv/jenkins/bin/common-functions.sh
+common_init "$@"
+
+# bootstraps a new chroot for schroot, and then moves it into the right location
+
+# $1 = schroot name
+# $2 = base distro
+# $3 $4 ... = extra packages to install
+
+if [ $# -lt 2 ]; then
+	echo "usage: $0 TARGET DISTRO [backports] CMD [ARG1 ARG2 ...]"
+	exit 1
+fi
+TARGET="$1"
+shift
+DISTRO="$1"
+shift
+
+if [ "$1" == "backports" ] ; then
+	BACKPORTS="deb $MIRROR ${DISTRO}-backports main"
+	BACKPORTSSRC="deb-src $MIRROR ${DISTRO}-backports main"
+	shift
+fi
+
+if [ ! -d "$CHROOT_BASE" ]; then
+	echo "Directory $CHROOT_BASE does not exist, aborting."
+	exit 1
+fi
+
+export CHROOT_TARGET=$(mktemp -d -p $CHROOT_BASE/ schroot-install-$TARGET-XXXX)
+if [ -z "$CHROOT_TARGET" ]; then
+	echo "Could not create a directory to create the chroot in, aborting."
+	exit 1
+fi
+
+bootstrap() {
+	mkdir -p "$CHROOT_TARGET/etc/dpkg/dpkg.cfg.d"
+	echo force-unsafe-io > "$CHROOT_TARGET/etc/dpkg/dpkg.cfg.d/02dpkg-unsafe-io"
+
+	echo "Bootstraping $DISTRO into $CHROOT_TARGET now."
+	sudo debootstrap $DISTRO $CHROOT_TARGET $MIRROR
+
+	echo -e '#!/bin/sh\nexit 101'              | sudo tee   $CHROOT_TARGET/usr/sbin/policy-rc.d >/dev/null
+	sudo chmod +x $CHROOT_TARGET/usr/sbin/policy-rc.d
+	echo 'Acquire::http::Proxy "$http_proxy";' | sudo tee    $CHROOT_TARGET/etc/apt/apt.conf.d/80proxy >/dev/null
+	echo "deb-src $MIRROR $DISTRO main"        | sudo tee -a $CHROOT_TARGET/etc/apt/sources.list > /dev/null
+	echo "${BACKPORTS}"                        | sudo tee -a $CHROOT_TARGET/etc/apt/sources.list >/dev/null
+	echo "${BACKPORTSSRC}"                     | sudo tee -a $CHROOT_TARGET/etc/apt/sources.list >/dev/null
+
+	sudo chroot $CHROOT_TARGET apt-get update
+	if [ -n "$1" ] ; then
+		sudo chroot $CHROOT_TARGET apt-get install -y --no-install-recommends "$@"
+	fi
+}
+
+cleanup() {
+	if [ -d $CHROOT_TARGET ]; then
+		sudo rm -rf --one-file-system $CHROOT_TARGET || fuser -mv $CHROOT_TARGET
+	fi
+}
+trap cleanup INT TERM EXIT
+bootstrap $@
+
+trap - INT TERM EXIT
+
+# aquire a write lock in any case
+touch $DBDCHROOT_WRITELOCK
+if [ -f $DBDCHROOT_READLOCK ] ; then
+	# patiently wait for our users to using the schroot
+	for i in $(seq 0 100) ; do
+		sleep 15
+		echo "sleeping 15s, debbindiff schroot is locked and used."
+		if [ ! -f $DBDCHROOT_READLOCK ] ; then
+			break
+		fi
+	done
+	if [ -f $DBDCHROOT_READLOCK ] ; then
+		echo "Warning: lock $DBDCHROOT_READLOCK still exists, exiting."
+		exit 1
+	fi
+fi
+
+# pivot the new schroot in place
+rand=$RANDOM
+if [ -d $SCHROOT_BASE/"$TARGET" ]
+then
+	sudo mv $SCHROOT_BASE/"$TARGET" $SCHROOT_BASE/"$TARGET"-"$rand"
+fi
+
+sudo mv $CHROOT_TARGET $SCHROOT_BASE/"$TARGET"
+
+if [ -d $SCHROOT_BASE/"$TARGET"-"$rand" ]
+then
+	sudo rm -rf --one-file-system $SCHROOT_BASE/"$TARGET"-"$rand"
+fi
+
+# write the schroot config
+echo "Writing configuration"
+sudo tee /etc/schroot/chroot.d/jenkins-"$TARGET" <<-__END__
+	[jenkins-$TARGET]
+	description=Jenkins schroot $TARGET
+	directory=$SCHROOT_BASE/$TARGET
+	type=directory
+	root-users=jenkins
+	source-root-users=jenkins
+	union-type=aufs
+	__END__
+
+# remove the lock
+rm $DBDCHROOT_WRITELOCK
+
-- 
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