fedora: improve error handling

Interrupt build process when error encountered.

scripts_fedora/02_install_groups.sh

@@ -15,3 +15,5 @@ yum install -c $PWD/yum.conf $YUM_OPTS -y --installroot=$INSTALLDIR $PKGGROUPS |
 yum update -c $PWD/yum.conf $YUM_OPTS -y --installroot=$INSTALLDIR || RETCODE=1
 
 umount mnt/proc
+
+exit $RETCODE

scripts_fedora/04_install_qubes.sh

@@ -4,9 +4,11 @@ mount -t proc proc $PWD/mnt/proc
 
 echo "--> Installing RPMs..."
 export YUM0=$PWD/yum_repo_qubes
-yum install -c $PWD/yum.conf $YUM_OPTS -y --installroot=$(pwd)/mnt @qubes-vm
+yum install -c $PWD/yum.conf $YUM_OPTS -y --installroot=$(pwd)/mnt @qubes-vm || RETCODE=1
 
 echo "--> Installing 3rd party apps"
-$SCRIPTSDIR/add_3rd_party_software.sh
+$SCRIPTSDIR/add_3rd_party_software.sh || RETCODE=1
 
 umount $PWD/mnt/proc
+
+exit $RETCODE

scripts_fedora/add_3rd_party_software.sh

@@ -2,6 +2,6 @@
 
 INSTALLDIR=$PWD/mnt
 
-rpm -i --root=$INSTALLDIR $SCRIPTSDIR/3rd_party_software/adobe-release-x86_64-*.noarch.rpm
+rpm -i --root=$INSTALLDIR $SCRIPTSDIR/3rd_party_software/adobe-release-x86_64-*.noarch.rpm || exit 1
 rpm --import --root=$INSTALLDIR mnt/etc/pki/rpm-gpg/RPM-GPG-KEY-adobe-linux
-yum install -c $PWD/yum.conf $YUM_OPTS -y --installroot=$INSTALLDIR flash-plugin
+yum install -c $PWD/yum.conf $YUM_OPTS -y --installroot=$INSTALLDIR flash-plugin || exit 1