From: Zoltán Felleg <zoltan.felleg@userrendszerhaz.hu>
Date: Tue, 11 Jan 2022 13:56:18 +0000 (+0100)
Subject: Updated scripts to create containers from a base image.
X-Git-Url: http://git.useribm.hu/?a=commitdiff_plain;h=f3f33d5cc2d405d2d9f5ef913676e1d4bd16c872;p=user-lxc.git

Updated scripts to create containers from a base image.
---

diff --git a/scripts/create-base.sh b/scripts/create-base.sh
new file mode 100755
index 0000000..6764ccd
--- /dev/null
+++ b/scripts/create-base.sh
@@ -0,0 +1,401 @@
+#!/bin/sh
+
+
+USAGE="Usage: $(basename $0) <container operating system>"
+
+if [ $# -ne 1 ]
+then
+    echo "$USAGE" >&2
+    exit 1
+fi
+
+if [ ! -f /etc/lxc/lxc.conf ]
+then
+    echo "No lxc system configuration found" >&2
+    exit 1
+fi
+
+backup_old_container()
+{
+    if [ -z "$OLD_CONTAINER_NAME" ]
+    then
+        return 0
+    fi
+
+    if [ -d $OLD_CONTAINER_BACKUP_PATH ]
+    then
+        rm -Rf ${OLD_CONTAINER_BACKUP_PATH}.old
+        mv $OLD_CONTAINER_BACKUP_PATH ${OLD_CONTAINER_BACKUP_PATH}.old
+    fi
+
+    OLD_CONTAINER_STATE=$(lxc-info --name=$OLD_CONTAINER_NAME --state 2>/dev/null \
+                              | cut -f 2 -d ':' | tr -d ' ')
+    case "$OLD_CONTAINER_STATE" in
+        "RUNNING")
+            echo "Stopping (the old) container $OLD_CONTAINER_NAME"
+            lxc-stop --name=$OLD_CONTAINER_NAME
+	    echo "Stopped (the old) container $OLD_CONTAINER_NAME"
+            ;;
+        "STOPPED")
+            ;;
+        *)
+            echo "Unknown container state: $OLD_CONTAINER_STATE" >&2
+            exit 1
+            ;;
+    esac
+
+    mv $OLD_CONTAINER_PATH $OLD_CONTAINER_BACKUP_PATH
+}
+
+install_packages()
+{
+    case "$DISTRIBUTION" in
+        "CentOS")
+            YUM_CONFIG=$SCRIPT_PATH/yum.conf.centos
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
+            if [ -n "$ROOT_PACKAGES" ]
+            then
+                yum --assumeyes \
+                    --config=$YUM_CONFIG \
+                    --disablerepo=* \
+                    --enablerepo=local-* \
+                    --installroot=$CONTAINER_BUILDROOT \
+                    --releasever=$YUM_RELEASEVER \
+                    install $ROOT_PACKAGES
+            fi
+            if [ -n "$BASE_PACKAGES" ]
+            then
+                yum --assumeyes \
+                    --config=$YUM_CONFIG \
+                    --disablerepo=* \
+                    --enablerepo=local-* \
+                    --installroot=$CONTAINER_BUILDROOT \
+                    --releasever=$YUM_RELEASEVER \
+                    install $BASE_PACKAGES
+            fi
+            yum --assumeyes \
+                --config=$YUM_CONFIG \
+                --disablerepo=* \
+                --enablerepo=local-* \
+                --installroot=$CONTAINER_BUILDROOT \
+                --releasever=$YUM_RELEASEVER \
+                clean all
+            ;;
+        "Fedora")
+            DNF_CONFIG=$SCRIPT_PATH/dnf.conf.fedora
+            DNF_RELEASEVER=$DISTRIBUTION_VERSION
+            if [ -n "$ROOT_PACKAGES" ]
+            then
+                dnf --assumeyes \
+                    --config=$DNF_CONFIG \
+                    --disablerepo=* \
+                    --enablerepo=local-* \
+                    --installroot=$CONTAINER_BUILDROOT \
+                    --releasever=$DNF_RELEASEVER \
+                    install $ROOT_PACKAGES
+            fi
+            if [ -n "$BASE_PACKAGES" ]
+            then
+                dnf --assumeyes \
+                    --config=$DNF_CONFIG \
+                    --disablerepo=* \
+                    --enablerepo=local-* \
+                    --installroot=$CONTAINER_BUILDROOT \
+                    --releasever=$DNF_RELEASEVER \
+                    install $BASE_PACKAGES
+            fi
+            dnf --assumeyes \
+                --config=$DNF_CONFIG \
+                --disablerepo=* \
+                --enablerepo=local-* \
+                --installroot=$CONTAINER_BUILDROOT \
+                --releasever=$DNF_RELEASEVER \
+                clean all
+            ;;
+        "Rocky")
+            YUM_CONFIG=$SCRIPT_PATH/yum.conf.rocky
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
+            if [ -n "$ROOT_PACKAGES" ]
+            then
+                yum --assumeyes \
+                    --config=$YUM_CONFIG \
+                    --disablerepo=* \
+                    --enablerepo=local-* \
+                    --installroot=$CONTAINER_BUILDROOT \
+                    --releasever=$YUM_RELEASEVER \
+                    install $ROOT_PACKAGES
+            fi
+            if [ -n "$BASE_PACKAGES" ]
+            then
+                yum --assumeyes \
+                    --config=$YUM_CONFIG \
+                    --disablerepo=* \
+                    --enablerepo=local-* \
+                    --installroot=$CONTAINER_BUILDROOT \
+                    --releasever=$YUM_RELEASEVER \
+                    install $BASE_PACKAGES
+            fi
+            yum --assumeyes \
+                --config=$YUM_CONFIG \
+                --disablerepo=* \
+                --enablerepo=local-* \
+                --installroot=$CONTAINER_BUILDROOT \
+                --releasever=$YUM_RELEASEVER \
+                clean all
+            ;;
+    esac
+}
+
+create_build_path()
+{
+    echo "Creating and populating the container build directory."
+
+    mkdir --parents $CONTAINER_BUILDROOT
+
+    sed --expression="s|__CONTAINER_PATH__|$CONTAINER_PATH|" \
+        <$CONTAINER_SOURCE_PATH/config \
+        >$CONTAINER_BUILD_PATH/config
+    if [ -d $CONTAINER_SOURCE_PATH/hooks ]
+    then
+        cp --archive $CONTAINER_SOURCE_PATH/hooks $CONTAINER_BUILD_PATH
+    fi
+
+    echo "Created and populated the container build directory."
+}
+
+create_environment_file()
+{
+    ENV_FILE=$(mktemp)
+
+
+    echo "Creating environment file."
+
+    echo "SCRIPT_PATH=$SCRIPT_PATH" >>$ENV_FILE
+    echo "BASE_PATH=$BASE_PATH" >>$ENV_FILE
+    echo "BACKUPS_PATH=$BACKUPS_PATH" >>$ENV_FILE
+    echo "BUILD_PATH=$BUILD_PATH" >>$ENV_FILE
+    echo "FILESYSTEMS_PATH=$FILESYSTEMS_PATH" >>$ENV_FILE
+    echo "SOURCES_PATH=$SOURCES_PATH" >>$ENV_FILE
+    echo "SSH_KEYS_PATH=$SSH_KEYS_PATH" >>$ENV_FILE
+    echo >>$ENV_FILE
+    echo "CONTAINER_BASENAME=$CONTAINER_BASENAME" >>$ENV_FILE
+    echo "CONTAINER_NAME=$CONTAINER_NAME" >>$ENV_FILE
+    echo "CONTAINER_OS=$CONTAINER_OS" >>$ENV_FILE
+    echo "CONTAINER_PATH=$CONTAINER_PATH" >>$ENV_FILE
+    echo "CONTAINER_BUILD_PATH=$CONTAINER_BUILD_PATH" >>$ENV_FILE
+    echo "CONTAINER_FILESYSTEMS_PATH=$CONTAINER_FILESYSTEMS_PATH" >>$ENV_FILE
+    echo "CONTAINER_SOURCE_PATH=$CONTAINER_SOURCE_PATH" >>$ENV_FILE
+    echo "CONTAINER_BUILDROOT=$CONTAINER_BUILDROOT" >>$ENV_FILE
+    echo >>$ENV_FILE
+    echo "OLD_CONTAINER_NAME=$OLD_CONTAINER_NAME" >>$ENV_FILE
+    echo "OLD_CONTAINER_PATH=$OLD_CONTAINER_PATH" >>$ENV_FILE
+    echo "OLD_CONTAINER_BACKUP_PATH=$OLD_CONTAINER_BACKUP_PATH" >>$ENV_FILE
+
+    echo "Environment file created."
+}
+
+set_variables()
+{
+    CONTAINER_OS_PARAMETER=$1
+
+
+    echo "Setting variables."
+
+    CONTAINER_BASENAME="base"
+    CONTAINER_NAME_PARAMETER="${CONTAINER_BASENAME}.$CONTAINER_OS_PARAMETER"
+
+    LXC_PATH=$(grep '^lxc.lxcpath' /etc/lxc/lxc.conf \
+               | cut -f 2 -d '=' | tr -d ' ')
+
+    SCRIPT_PATH=$(dirname $(realpath $0))
+    BASE_PATH=$(dirname $SCRIPT_PATH)
+    BACKUPS_PATH=$BASE_PATH/backups
+    BUILD_PATH=$BASE_PATH/build
+    FILESYSTEMS_PATH=$BASE_PATH/filesystems
+    SOURCES_PATH=$BASE_PATH/sources
+    SSH_KEYS_PATH=$BASE_PATH/user-ssh
+
+    CONTAINER_SOURCE_PATH=$SOURCES_PATH/$CONTAINER_NAME_PARAMETER
+
+    if [ ! -d $CONTAINER_SOURCE_PATH ]
+    then
+        echo "No source found for $CONTAINER_NAME_PARAMETER" >&2
+        return 1
+    fi
+
+    if [ ! -f $CONTAINER_SOURCE_PATH/config ]
+    then
+        echo "No config file found for $CONTAINER_NAME_PARAMETER" >&2
+        return 2
+    fi
+
+    if [ ! -f $CONTAINER_SOURCE_PATH/envvars ]
+    then
+        echo "No envvars file found for $CONTAINER_NAME_PARAMETER" >&2
+        return 3
+    fi
+
+    source $CONTAINER_SOURCE_PATH/envvars
+    RC=$?
+    if [ $RC -ne 0 ]
+    then
+        echo "Could not source $CONTAINER_SOURCE_PATH/envvars, rc: $RC" >&2
+        return 4
+    fi
+
+    if [ -z "$DISTRIBUTION" ]
+    then
+        echo "No DISTRIBUTION variable set in envvars file" >&2
+        return 5
+    fi
+    if [ -z "$DISTRIBUTION_VERSION" ]
+    then
+        echo "No DISTRIBUTION_VERSION variable set in envvars file" >&2
+        return 6
+    fi
+
+    case "$DISTRIBUTION" in
+        "CentOS")
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
+            ;;
+        "Fedora")
+            DNF_RELEASEVER=$DISTRIBUTION_VERSION
+            ;;
+        "Rocky")
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
+            ;;
+        *)
+            echo "Unknown distribution: $DISTRIBUTION" >&2
+            return 7
+            ;;
+    esac
+
+    DISTRIBUTION_FIRST_CHAR=$(echo "$DISTRIBUTION" | cut -c 1 | tr '[A-Z]' '[a-z]')
+    CONTAINER_OS="${DISTRIBUTION_FIRST_CHAR}$DISTRIBUTION_VERSION"
+
+    if [ "$CONTAINER_OS_PARAMETER" != "$CONTAINER_OS" ]
+    then
+        echo "Container operating system mismatch." >&2
+        return 8
+    fi
+
+    CONTAINER_NAME="${CONTAINER_BASENAME}.$CONTAINER_OS"
+
+    CONTAINER_PATH=$LXC_PATH/$CONTAINER_NAME
+    CONTAINER_BUILD_PATH=$BUILD_PATH/$CONTAINER_NAME
+
+    if [ -d $CONTAINER_BUILD_PATH ]
+    then
+        echo "The build directory already exists." >&2
+        return 9
+    fi
+
+    CONTAINER_BUILDROOT=$CONTAINER_BUILD_PATH/rootfs
+
+    OLD_CONTAINER_NAME=$(lxc-ls -1 | grep "^${CONTAINER_NAME}$")
+    OLD_CONTAINER_PATH=$LXC_PATH/$OLD_CONTAINER_NAME
+    OLD_CONTAINER_BACKUP_PATH=$BACKUPS_PATH/$OLD_CONTAINER_NAME
+
+    echo "All variables set."
+}
+
+preinstall()
+{
+    if [ -d $CONTAINER_SOURCE_PATH/preinstall ]
+    then
+        cp --archive $CONTAINER_SOURCE_PATH/preinstall $CONTAINER_BUILDROOT
+        chmod 755 $CONTAINER_BUILDROOT/preinstall/*.sh
+        for SCRIPT in $CONTAINER_BUILDROOT/preinstall/*.sh
+        do
+            echo $SCRIPT $ENV_FILE
+            $SCRIPT $ENV_FILE
+        done
+    fi
+
+    mkdir $CONTAINER_BUILDROOT/dev
+    mkdir $CONTAINER_BUILDROOT/proc
+    mount -o bind /dev $CONTAINER_BUILDROOT/dev
+    mount -t proc proc $CONTAINER_BUILDROOT/proc
+}
+
+postinstall()
+{
+    if [ -d $CONTAINER_SOURCE_PATH/postinstall ]
+    then
+        cp --archive $CONTAINER_SOURCE_PATH/postinstall $CONTAINER_BUILDROOT
+        if [ -f $CONTAINER_SOURCE_PATH/postinstall/copy.list ]
+        then
+            grep -v '^#' $CONTAINER_SOURCE_PATH/postinstall/copy.list | while read LINE
+            do
+                SRC_HOST=$(echo "$LINE" | cut -f 1 -d ' ')
+                SRC_PATH=$(echo "$LINE" | cut -f 2 -d ' ')
+                TGT_PATH=$(echo "$LINE" | cut -f 3 -d ' ')
+                scp -pr -i $SSH_KEYS_PATH/scripts \
+                    root@${SRC_HOST}:$SRC_PATH \
+                    $CONTAINER_BUILDROOT/postinstall/install/$TGT_PATH
+            done
+        fi
+    fi
+    if [ -d $CONTAINER_BUILDROOT/postinstall ]
+    then
+        chmod 755 $CONTAINER_BUILDROOT/postinstall/*.sh
+        for SCRIPT in $CONTAINER_BUILDROOT/postinstall/*.sh
+        do
+            POSTINSTALL_SCRIPT=$(echo $SCRIPT | sed "s|^$CONTAINER_BUILDROOT||")
+            echo chroot $CONTAINER_BUILDROOT $POSTINSTALL_SCRIPT
+            chroot $CONTAINER_BUILDROOT $POSTINSTALL_SCRIPT
+        done
+    fi
+
+    umount $CONTAINER_BUILDROOT/dev
+    umount $CONTAINER_BUILDROOT/proc
+}
+
+firstboot()
+{
+    if [ -d $CONTAINER_SOURCE_PATH/firstboot ]
+    then
+        cp --archive $CONTAINER_SOURCE_PATH/firstboot $CONTAINER_BUILDROOT
+        chmod 755 $CONTAINER_BUILDROOT/firstboot/*.sh
+        for SCRIPT in $CONTAINER_BUILDROOT/firstboot/*.sh
+        do
+            FIRSTBOOT_SCRIPT=$(echo $SCRIPT | sed "s|^$CONTAINER_BUILDROOT||")
+            echo lxc-attach --name=$CONTAINER_NAME -- $FIRSTBOOT_SCRIPT
+            lxc-attach --name=$CONTAINER_NAME -- $FIRSTBOOT_SCRIPT
+        done
+    fi
+}
+
+set_variables $1
+RC=$?
+if [ $RC -ne 0 ]
+then
+    echo "Could not set variables, rc: $RC" >&2
+    exit $RC
+fi
+
+echo "Starting at $(date)"
+
+create_environment_file
+
+create_build_path
+
+preinstall
+
+install_packages
+
+postinstall
+
+backup_old_container
+
+################################################################
+# move the new container to its place                          #
+################################################################
+mv $CONTAINER_BUILD_PATH $CONTAINER_PATH
+
+################################################################
+# remove the environment file                                  #
+################################################################
+rm -f $ENV_FILE
+
+echo "Finishing at $(date)"
diff --git a/scripts/create-container.sh b/scripts/create-container.sh
index 5281af4..bbe698c 100755
--- a/scripts/create-container.sh
+++ b/scripts/create-container.sh
@@ -9,273 +9,376 @@ then
     exit 1
 fi
 
-if [ -f /etc/lxc/lxc.conf ]
+if [ ! -f /etc/lxc/lxc.conf ]
 then
-    LXC_PATH=$(grep '^lxc.lxcpath' /etc/lxc/lxc.conf \
-               | cut -f 2 -d '=' | tr -d ' ')
-else
     echo "No lxc system configuration found" >&2
     exit 1
 fi
 
-SCRIPT_PATH=$(dirname $(realpath $0))
-BASE_PATH=$(dirname $SCRIPT_PATH)
-BACKUPS_PATH=$BASE_PATH/backups
-BUILD_PATH=$BASE_PATH/build
-FILESYSTEMS_PATH=$BASE_PATH/filesystems
-SOURCES_PATH=$BASE_PATH/sources
-SSH_KEYS_PATH=$BASE_PATH/user-ssh
-
-source $SCRIPT_PATH/functions
-RC=$?
-if [ $RC -ne 0 ]
-then
-    echo "Could not source functions: $RC" >&2
-    exit $RC
-fi
-
-CONTAINER_BASENAME=$(basename $1)
-CONTAINER_FILESYSTEMS_PATH=$FILESYSTEMS_PATH/$CONTAINER_BASENAME
-CONTAINER_SOURCE_PATH=$SOURCES_PATH/$CONTAINER_BASENAME
-
-################################################################
-# exit if no source exists for the container                   #
-################################################################
-if [ ! -d $CONTAINER_SOURCE_PATH ]
-then
-    echo "No source found for $CONTAINER_BASENAME" >&2
-    exit 1
-fi
-source $CONTAINER_SOURCE_PATH/envvars
-
-case "$DISTRIBUTION" in
-    "CentOS")
-        YUM_RELEASEVER=$DISTRIBUTION_VERSION
-        ;;
-    "Fedora")
-        DNF_RELEASEVER=$DISTRIBUTION_VERSION
-        ;;
-    *)
-        echo "Unknown distribution: $DISTRIBUTION" >&2
-        exit 1
-        ;;
-esac
-DISTRIBUTION_FIRST_CHAR=$(echo "$DISTRIBUTION" | cut -c 1 | tr '[A-Z]' '[a-z]')
-CONTAINER_OS="${DISTRIBUTION_FIRST_CHAR}$DISTRIBUTION_VERSION"
-PREV_DISTRIBUTION_VERSION=$(( $DISTRIBUTION_VERSION - 1 ))
-PREV_CONTAINER_OS="${DISTRIBUTION_FIRST_CHAR}$PREV_DISTRIBUTION_VERSION"
-
-CONTAINER_NAME="${CONTAINER_BASENAME}.$CONTAINER_OS"
-
-CONTAINER_PATH=$LXC_PATH/$CONTAINER_NAME
-CONTAINER_BUILD_PATH=$BUILD_PATH/$CONTAINER_NAME
-
-CONTAINER_START_ORDER=$(grep -w $CONTAINER_BASENAME $SOURCES_PATH/start-order.txt \
-                            | awk '{print $2}')
-
-################################################################
-# exit if the container does not have a start order            #
-################################################################
-if [ -z "$CONTAINER_START_ORDER" ]
-then
-    echo "The container does not have a start order." >&2
-    exit 1
-fi
-
-################################################################
-# exit if the container build directory already exists         #
-################################################################
-if [ -d $CONTAINER_BUILD_PATH ]
-then
-    echo "The build directory already exists." >&2
-    exit 1
-fi
-
-echo "Starting at $(date)"
-
-################################################################
-# find the old container if it exists                          #
-################################################################
-lxc-ls -1 | grep "^${CONTAINER_NAME}$" >/dev/null 2>&1
-if [ $? -eq 0 ]
-then
-    OLD_CONTAINER_NAME=$CONTAINER_NAME
-else
-    PREV_CONTAINER_NAME="${CONTAINER_BASENAME}.$PREV_CONTAINER_OS"
-    lxc-ls -1 | grep "^${PREV_CONTAINER_NAME}$" >/dev/null 2>&1
-    if [ $? -eq 0 ]
+backup_old_container()
+{
+    if [ -z "$OLD_CONTAINER_NAME" ]
     then
-        OLD_CONTAINER_NAME=$PREV_CONTAINER_NAME
+        return 0
     fi
-fi
-OLD_CONTAINER_PATH=$LXC_PATH/$OLD_CONTAINER_NAME
-OLD_CONTAINER_BACKUP_PATH=$BACKUPS_PATH/$OLD_CONTAINER_NAME
-
-################################################################
-# create the environment file                                  #
-################################################################
-ENV_FILE=$(mktemp)
-
-echo "SCRIPT_PATH=$SCRIPT_PATH" >>$ENV_FILE
-echo "BASE_PATH=$BASE_PATH" >>$ENV_FILE
-echo "BACKUPS_PATH=$BACKUPS_PATH" >>$ENV_FILE
-echo "BUILD_PATH=$BUILD_PATH" >>$ENV_FILE
-echo "FILESYSTEMS_PATH=$FILESYSTEMS_PATH" >>$ENV_FILE
-echo "SOURCES_PATH=$SOURCES_PATH" >>$ENV_FILE
-echo "SSH_KEYS_PATH=$SSH_KEYS_PATH" >>$ENV_FILE
-echo >>$ENV_FILE
-echo "CONTAINER_BASENAME=$CONTAINER_BASENAME" >>$ENV_FILE
-echo "CONTAINER_NAME=$CONTAINER_NAME" >>$ENV_FILE
-echo "CONTAINER_OS=$CONTAINER_OS" >>$ENV_FILE
-echo "CONTAINER_PATH=$CONTAINER_PATH" >>$ENV_FILE
-echo "CONTAINER_BUILD_PATH=$CONTAINER_BUILD_PATH" >>$ENV_FILE
-echo "CONTAINER_FILESYSTEMS_PATH=$CONTAINER_FILESYSTEMS_PATH" >>$ENV_FILE
-echo "CONTAINER_SOURCE_PATH=$CONTAINER_SOURCE_PATH" >>$ENV_FILE
-echo >>$ENV_FILE
-echo "OLD_CONTAINER_NAME=$OLD_CONTAINER_NAME" >>$ENV_FILE
-echo "OLD_CONTAINER_PATH=$OLD_CONTAINER_PATH" >>$ENV_FILE
-echo "OLD_CONTAINER_BACKUP_PATH=$OLD_CONTAINER_BACKUP_PATH" >>$ENV_FILE
 
-################################################################
-# create and populate the container build directory            #
-################################################################
-echo "Creating the container build directory."
-mkdir --parents $CONTAINER_BUILD_PATH/rootfs
-
-echo "Creating container config and hooks."
-sed --expression="s|__CONTAINER_FILESYSTEMS_PATH__|$CONTAINER_FILESYSTEMS_PATH|" \
-    --expression="s|__CONTAINER_PATH__|$CONTAINER_PATH|" \
-    --expression="s|__CONTAINER_START_ORDER__|$CONTAINER_START_ORDER|" \
-    <$CONTAINER_SOURCE_PATH/config \
-    >$CONTAINER_BUILD_PATH/config
-if [ -d $CONTAINER_SOURCE_PATH/hooks ]
-then
-    cp --archive $CONTAINER_SOURCE_PATH/hooks $CONTAINER_BUILD_PATH
-fi
+    if [ -d $OLD_CONTAINER_BACKUP_PATH ]
+    then
+        rm -Rf ${OLD_CONTAINER_BACKUP_PATH}.old
+        mv $OLD_CONTAINER_BACKUP_PATH ${OLD_CONTAINER_BACKUP_PATH}.old
+    fi
 
-################################################################
-# execute preinstall phase                                     #
-################################################################
-echo "Executing preinstall phase."
-preinstall $ENV_FILE
+    OLD_CONTAINER_STATE=$(lxc-info --name=$OLD_CONTAINER_NAME --state 2>/dev/null \
+                              | cut -f 2 -d ':' | tr -d ' ')
+    case "$OLD_CONTAINER_STATE" in
+        "RUNNING")
+            echo "Stopping (the old) container $OLD_CONTAINER_NAME"
+            lxc-stop --name=$OLD_CONTAINER_NAME
+	    echo "Stopped (the old) container $OLD_CONTAINER_NAME"
+            ;;
+        "STOPPED")
+            ;;
+        *)
+            echo "Unknown container state: $OLD_CONTAINER_STATE" >&2
+            exit 1
+            ;;
+    esac
 
-################################################################
-# install packages into the container                          #
-################################################################
-case "$DISTRIBUTION" in
-    "CentOS")
-        YUM_CONFIG=$SCRIPT_PATH/yum.conf.centos
-        yum --assumeyes \
-            --config=$YUM_CONFIG \
-            --disableplugin=fastestmirror \
-            --disablerepo=* \
-            --enablerepo=local-* \
-            --installroot=$CONTAINER_BUILD_PATH/rootfs \
-            --releasever=$YUM_RELEASEVER \
-            install $BASE_PACKAGES
-        if [ -n "$SPEC_PACKAGES" ]
-        then
+    mv $OLD_CONTAINER_PATH $OLD_CONTAINER_BACKUP_PATH
+}
+
+copy_and_install()
+{
+    case "$DISTRIBUTION" in
+        "CentOS")
+            YUM_CONFIG=$SCRIPT_PATH/yum.conf.centos
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
+            cp --archive --link \
+                $LXC_PATH/base.$CONTAINER_OS/rootfs/* \
+                $CONTAINER_BUILDROOT
+            if [ -n "$SPEC_PACKAGES" ]
+            then
+                yum --assumeyes \
+                    --config=$YUM_CONFIG \
+                    --disablerepo=* \
+                    --enablerepo=local-* \
+                    --installroot=$CONTAINER_BUILDROOT \
+                    --releasever=$YUM_RELEASEVER \
+                    install $SPEC_PACKAGES
+            fi
             yum --assumeyes \
                 --config=$YUM_CONFIG \
-                --disableplugin=fastestmirror \
                 --disablerepo=* \
                 --enablerepo=local-* \
-                --installroot=$CONTAINER_BUILD_PATH/rootfs \
+                --installroot=$CONTAINER_BUILDROOT \
                 --releasever=$YUM_RELEASEVER \
-                install $SPEC_PACKAGES
-        fi
-        yum --assumeyes \
-            --config=$YUM_CONFIG \
-            --disableplugin=fastestmirror \
-            --disablerepo=* \
-            --enablerepo=local-* \
-            --installroot=$CONTAINER_BUILD_PATH/rootfs \
-            --releasever=$YUM_RELEASEVER \
-            clean all
-        ;;
-    "Fedora")
-        DNF_CONFIG=$SCRIPT_PATH/dnf.conf.fedora
-        if [ -n "$ROOT_PACKAGES" ]
-        then
+                clean all
+            ;;
+        "Fedora")
+            DNF_CONFIG=$SCRIPT_PATH/dnf.conf.fedora
+            DNF_RELEASEVER=$DISTRIBUTION_VERSION
+            cp --archive --link \
+                $LXC_PATH/base.$CONTAINER_OS/rootfs/* \
+                $CONTAINER_BUILDROOT
+            if [ -n "$SPEC_PACKAGES" ]
+            then
+                dnf --assumeyes \
+                    --config=$DNF_CONFIG \
+                    --disablerepo=* \
+                    --enablerepo=local-* \
+                    --installroot=$CONTAINER_BUILDROOT \
+                    --releasever=$DNF_RELEASEVER \
+                    install $SPEC_PACKAGES
+            fi
             dnf --assumeyes \
                 --config=$DNF_CONFIG \
                 --disablerepo=* \
                 --enablerepo=local-* \
-                --installroot=$CONTAINER_BUILD_PATH/rootfs \
+                --installroot=$CONTAINER_BUILDROOT \
                 --releasever=$DNF_RELEASEVER \
-                install $ROOT_PACKAGES
-        fi
-        dnf --assumeyes \
-            --config=$DNF_CONFIG \
-            --disablerepo=* \
-            --enablerepo=local-* \
-            --installroot=$CONTAINER_BUILD_PATH/rootfs \
-            --releasever=$DNF_RELEASEVER \
-            install $BASE_PACKAGES
-        dnf --assumeyes \
-            --config=$DNF_CONFIG \
-            --disablerepo=* \
-            --enablerepo=local-* \
-            --installroot=$CONTAINER_BUILD_PATH/rootfs \
-            --releasever=$DNF_RELEASEVER \
-            install $SPEC_PACKAGES
-        dnf --assumeyes \
-            --config=$DNF_CONFIG \
-            --disablerepo=* \
-            --enablerepo=local-* \
-            --installroot=$CONTAINER_BUILD_PATH/rootfs \
-            --releasever=$DNF_RELEASEVER \
-            clean all
-        ;;
-esac
+                clean all
+            ;;
+        "Rocky")
+            YUM_CONFIG=$SCRIPT_PATH/yum.conf.rocky
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
+            cp --archive --link \
+                $LXC_PATH/base.$CONTAINER_OS/rootfs/* \
+                $CONTAINER_BUILDROOT
+            if [ -n "$SPEC_PACKAGES" ]
+            then
+                yum --assumeyes \
+                    --config=$YUM_CONFIG \
+                    --disablerepo=* \
+                    --enablerepo=local-* \
+                    --installroot=$CONTAINER_BUILDROOT \
+                    --releasever=$YUM_RELEASEVER \
+                    install $SPEC_PACKAGES
+            fi
+            yum --assumeyes \
+                --config=$YUM_CONFIG \
+                --disablerepo=* \
+                --enablerepo=local-* \
+                --installroot=$CONTAINER_BUILDROOT \
+                --releasever=$YUM_RELEASEVER \
+                clean all
+            ;;
+    esac
+}
 
-################################################################
-# execute postinstall phase                                    #
-################################################################
-echo "Executing postinstall phase."
-postinstall $ENV_FILE
+create_build_path()
+{
+    echo "Creating and populating the container build directory."
 
-################################################################
-# rename the backup of the old container if needed             #
-################################################################
-if [ -n "$OLD_CONTAINER_NAME" ]
-then
-    if [ -d $OLD_CONTAINER_BACKUP_PATH ]
+    mkdir --parents $CONTAINER_BUILDROOT
+
+    sed --expression="s|__CONTAINER_FILESYSTEMS_PATH__|$CONTAINER_FILESYSTEMS_PATH|" \
+        --expression="s|__CONTAINER_PATH__|$CONTAINER_PATH|" \
+        --expression="s|__CONTAINER_START_ORDER__|$CONTAINER_START_ORDER|" \
+        <$CONTAINER_SOURCE_PATH/config \
+        >$CONTAINER_BUILD_PATH/config
+    if [ -d $CONTAINER_SOURCE_PATH/hooks ]
     then
-        rm -Rf ${OLD_CONTAINER_BACKUP_PATH}.old
-        mv $OLD_CONTAINER_BACKUP_PATH ${OLD_CONTAINER_BACKUP_PATH}.old
+        cp --archive $CONTAINER_SOURCE_PATH/hooks $CONTAINER_BUILD_PATH
     fi
-fi
 
-################################################################
-# shut down the old container if needed                        #
-################################################################
-if [ -n "$OLD_CONTAINER_NAME" ]
-then
-    OLD_CONTAINER_STATE=$(lxc-info --name=$OLD_CONTAINER_NAME --state 2>/dev/null | cut -f 2 -d ':' | tr -d ' ')
-    case "$OLD_CONTAINER_STATE" in
-        "RUNNING")
-            echo "Stopping container $OLD_CONTAINER_NAME"
-            lxc-stop --name=$OLD_CONTAINER_NAME
-            echo "Stopped container $OLD_CONTAINER_NAME"
+    echo "Created and populated the container build directory."
+}
+
+create_environment_file()
+{
+    ENV_FILE=$(mktemp)
+
+
+    echo "Creating environment file."
+
+    echo "SCRIPT_PATH=$SCRIPT_PATH" >>$ENV_FILE
+    echo "BASE_PATH=$BASE_PATH" >>$ENV_FILE
+    echo "BACKUPS_PATH=$BACKUPS_PATH" >>$ENV_FILE
+    echo "BUILD_PATH=$BUILD_PATH" >>$ENV_FILE
+    echo "FILESYSTEMS_PATH=$FILESYSTEMS_PATH" >>$ENV_FILE
+    echo "SOURCES_PATH=$SOURCES_PATH" >>$ENV_FILE
+    echo "SSH_KEYS_PATH=$SSH_KEYS_PATH" >>$ENV_FILE
+    echo >>$ENV_FILE
+    echo "CONTAINER_BASENAME=$CONTAINER_BASENAME" >>$ENV_FILE
+    echo "CONTAINER_NAME=$CONTAINER_NAME" >>$ENV_FILE
+    echo "CONTAINER_OS=$CONTAINER_OS" >>$ENV_FILE
+    echo "CONTAINER_PATH=$CONTAINER_PATH" >>$ENV_FILE
+    echo "CONTAINER_BUILD_PATH=$CONTAINER_BUILD_PATH" >>$ENV_FILE
+    echo "CONTAINER_FILESYSTEMS_PATH=$CONTAINER_FILESYSTEMS_PATH" >>$ENV_FILE
+    echo "CONTAINER_SOURCE_PATH=$CONTAINER_SOURCE_PATH" >>$ENV_FILE
+    echo "CONTAINER_BUILDROOT=$CONTAINER_BUILDROOT" >>$ENV_FILE
+    echo >>$ENV_FILE
+    echo "OLD_CONTAINER_NAME=$OLD_CONTAINER_NAME" >>$ENV_FILE
+    echo "OLD_CONTAINER_PATH=$OLD_CONTAINER_PATH" >>$ENV_FILE
+    echo "OLD_CONTAINER_BACKUP_PATH=$OLD_CONTAINER_BACKUP_PATH" >>$ENV_FILE
+
+    echo "Environment file created."
+}
+
+set_variables()
+{
+    CONTAINER_NAME_PARAMETER=$1
+
+
+    echo "Setting variables."
+
+    CONTAINER_BASENAME=$(basename $CONTAINER_NAME_PARAMETER)
+
+    LXC_PATH=$(grep '^lxc.lxcpath' /etc/lxc/lxc.conf \
+               | cut -f 2 -d '=' | tr -d ' ')
+
+    SCRIPT_PATH=$(dirname $(realpath $0))
+    BASE_PATH=$(dirname $SCRIPT_PATH)
+    BACKUPS_PATH=$BASE_PATH/backups
+    BUILD_PATH=$BASE_PATH/build
+    FILESYSTEMS_PATH=$BASE_PATH/filesystems
+    SOURCES_PATH=$BASE_PATH/sources
+    SSH_KEYS_PATH=$BASE_PATH/user-ssh
+
+    CONTAINER_FILESYSTEMS_PATH=$FILESYSTEMS_PATH/$CONTAINER_BASENAME
+    CONTAINER_SOURCE_PATH=$SOURCES_PATH/$CONTAINER_BASENAME
+
+    if [ ! -d $CONTAINER_SOURCE_PATH ]
+    then
+        echo "No source found for $CONTAINER_BASENAME" >&2
+        return 1
+    fi
+
+    if [ ! -f $CONTAINER_SOURCE_PATH/config ]
+    then
+        echo "No config file found for $CONTAINER_BASENAME" >&2
+        return 2
+    fi
+
+    if [ ! -f $CONTAINER_SOURCE_PATH/envvars ]
+    then
+        echo "No envvars file found for $CONTAINER_BASENAME" >&2
+        return 3
+    fi
+
+    source $CONTAINER_SOURCE_PATH/envvars
+    RC=$?
+    if [ $RC -ne 0 ]
+    then
+        echo "Could not source $CONTAINER_SOURCE_PATH/envvars, rc: $RC" >&2
+        return 4
+    fi
+
+    if [ -z "$DISTRIBUTION" ]
+    then
+        echo "No DISTRIBUTION variable set in envvars file" >&2
+        return 5
+    fi
+    if [ -z "$DISTRIBUTION_VERSION" ]
+    then
+        echo "No DISTRIBUTION_VERSION variable set in envvars file" >&2
+        return 6
+    fi
+
+    case "$DISTRIBUTION" in
+        "CentOS")
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
             ;;
-        "STOPPED")
+        "Fedora")
+            DNF_RELEASEVER=$DISTRIBUTION_VERSION
+            ;;
+        "Rocky")
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
             ;;
         *)
-            echo "Unknown container state: $OLD_CONTAINER_STATE" >&2
-            exit 1
+            echo "Unknown distribution: $DISTRIBUTION" >&2
+            return 7
             ;;
     esac
-fi
 
-################################################################
-# back up the old container if needed                          #
-################################################################
-if [ -n "$OLD_CONTAINER_NAME" ]
+    DISTRIBUTION_FIRST_CHAR=$(echo "$DISTRIBUTION" | cut -c 1 | tr '[A-Z]' '[a-z]')
+    CONTAINER_OS="${DISTRIBUTION_FIRST_CHAR}$DISTRIBUTION_VERSION"
+
+    if [ ! -d $LXC_PATH/base.$CONTAINER_OS ]
+    then
+        echo "The container does not have a base container." >&2
+        return 8
+    fi
+
+    CONTAINER_NAME="${CONTAINER_BASENAME}.$CONTAINER_OS"
+
+    CONTAINER_PATH=$LXC_PATH/$CONTAINER_NAME
+    CONTAINER_BUILD_PATH=$BUILD_PATH/$CONTAINER_NAME
+
+    if [ -d $CONTAINER_BUILD_PATH ]
+    then
+        echo "The build directory already exists." >&2
+        return 9
+    fi
+
+    CONTAINER_BUILDROOT=$CONTAINER_BUILD_PATH/rootfs
+
+    CONTAINER_START_ORDER=$(grep -w $CONTAINER_BASENAME $SOURCES_PATH/start-order.txt \
+                                | awk '{print $2}')
+
+    if [ -z "$CONTAINER_START_ORDER" ]
+    then
+        echo "The container does not have a start order." >&2
+        return 10
+    fi
+
+    OLD_CONTAINER_NAME=$(lxc-ls -1 | grep -w "^$CONTAINER_BASENAME")
+    #OLD_CONTAINER_OS=$(echo $OLD_CONTAINER_NAME | sed 's/.*\.\([^\.]*\)$/\1/')
+    OLD_CONTAINER_PATH=$LXC_PATH/$OLD_CONTAINER_NAME
+    OLD_CONTAINER_BACKUP_PATH=$BACKUPS_PATH/$OLD_CONTAINER_NAME
+
+    echo "All variables set."
+}
+
+preinstall()
+{
+    if [ -d $CONTAINER_SOURCE_PATH/preinstall ]
+    then
+        cp --archive $CONTAINER_SOURCE_PATH/preinstall $CONTAINER_BUILDROOT
+        chmod 755 $CONTAINER_BUILDROOT/preinstall/*.sh
+        for SCRIPT in $CONTAINER_BUILDROOT/preinstall/*.sh
+        do
+            echo $SCRIPT $ENV_FILE
+            $SCRIPT $ENV_FILE
+        done
+    fi
+
+    mkdir $CONTAINER_BUILDROOT/dev
+    mkdir $CONTAINER_BUILDROOT/proc
+    mount -o bind /dev $CONTAINER_BUILDROOT/dev
+    mount -t proc proc $CONTAINER_BUILDROOT/proc
+}
+
+postinstall()
+{
+    if [ -d $CONTAINER_SOURCE_PATH/postinstall ]
+    then
+        cp --archive $CONTAINER_SOURCE_PATH/postinstall $CONTAINER_BUILDROOT
+        if [ -f $CONTAINER_SOURCE_PATH/postinstall/copy.list ]
+        then
+            grep -v '^#' $CONTAINER_SOURCE_PATH/postinstall/copy.list | while read LINE
+            do
+                SRC_HOST=$(echo "$LINE" | cut -f 1 -d ' ')
+                SRC_PATH=$(echo "$LINE" | cut -f 2 -d ' ')
+                TGT_PATH=$(echo "$LINE" | cut -f 3 -d ' ')
+                scp -pr -i $SSH_KEYS_PATH/scripts \
+                    root@${SRC_HOST}:$SRC_PATH \
+                    $CONTAINER_BUILDROOT/postinstall/install/$TGT_PATH
+            done
+        fi
+    fi
+    if [ -d $CONTAINER_BUILDROOT/postinstall ]
+    then
+        chmod 755 $CONTAINER_BUILDROOT/postinstall/*.sh
+        for SCRIPT in $CONTAINER_BUILDROOT/postinstall/*.sh
+        do
+            POSTINSTALL_SCRIPT=$(echo $SCRIPT | sed "s|^$CONTAINER_BUILDROOT||")
+            echo chroot $CONTAINER_BUILDROOT $POSTINSTALL_SCRIPT
+            chroot $CONTAINER_BUILDROOT $POSTINSTALL_SCRIPT
+        done
+    fi
+
+    umount $CONTAINER_BUILDROOT/dev
+    umount $CONTAINER_BUILDROOT/proc
+}
+
+firstboot()
+{
+    if [ -d $CONTAINER_SOURCE_PATH/firstboot ]
+    then
+        cp --archive $CONTAINER_SOURCE_PATH/firstboot $CONTAINER_BUILDROOT
+        chmod 755 $CONTAINER_BUILDROOT/firstboot/*.sh
+        for SCRIPT in $CONTAINER_BUILDROOT/firstboot/*.sh
+        do
+            FIRSTBOOT_SCRIPT=$(echo $SCRIPT | sed "s|^$CONTAINER_BUILDROOT||")
+            echo lxc-attach --name=$CONTAINER_NAME -- $FIRSTBOOT_SCRIPT
+            lxc-attach --name=$CONTAINER_NAME -- $FIRSTBOOT_SCRIPT
+        done
+    fi
+}
+
+set_variables $1
+RC=$?
+if [ $RC -ne 0 ]
 then
-    mv $OLD_CONTAINER_PATH $OLD_CONTAINER_BACKUP_PATH
+    echo "Could not set variables, rc: $RC" >&2
+    exit $RC
 fi
 
+echo "Starting at $(date)"
+
+create_environment_file
+
+create_build_path
+
+preinstall
+
+copy_and_install
+
+postinstall
+
+backup_old_container
+
 ################################################################
 # move the new container to its place                          #
 ################################################################
@@ -284,17 +387,17 @@ mv $CONTAINER_BUILD_PATH $CONTAINER_PATH
 ################################################################
 # start up the new container                                   #
 ################################################################
-echo "Starting container $CONTAINER_NAME"
+echo "Starting (the new) container $CONTAINER_NAME"
 lxc-start --name=$CONTAINER_NAME --daemon
 
-echo "Waiting for container $CONTAINER_NAME to start up."
+echo "Waiting for (the new) container $CONTAINER_NAME to start up."
 lxc-wait --name=$CONTAINER_NAME --state=RUNNING
 
 ################################################################
 # execute firstboot phase                                      #
 ################################################################
 echo "Executing firstboot phase."
-firstboot $ENV_FILE
+firstboot
 
 ################################################################
 # remove the environment file                                  #
diff --git a/scripts/functions b/scripts/functions
deleted file mode 100644
index 6f7308e..0000000
--- a/scripts/functions
+++ /dev/null
@@ -1,95 +0,0 @@
-preinstall()
-{
-    ENV_FILE=$1
-
-    source $ENV_FILE
-    CONTAINER_ROOTFS=$CONTAINER_BUILD_PATH/rootfs
-
-    if [ -d $CONTAINER_SOURCE_PATH/preinstall ]
-    then
-        cp --archive $CONTAINER_SOURCE_PATH/preinstall $CONTAINER_ROOTFS
-        chmod 755 $CONTAINER_ROOTFS/preinstall/*.sh
-        for SCRIPT in $CONTAINER_ROOTFS/preinstall/*.sh
-        do
-            echo $SCRIPT $ENV_FILE
-            $SCRIPT $ENV_FILE
-        done
-    fi
-
-    mkdir $CONTAINER_ROOTFS/dev
-    mkdir $CONTAINER_ROOTFS/proc
-    mount -o bind /dev $CONTAINER_ROOTFS/dev
-    mount -t proc proc $CONTAINER_ROOTFS/proc
-}
-
-postinstall()
-{
-    ENV_FILE=$1
-
-    source $ENV_FILE
-    CONTAINER_ROOTFS=$CONTAINER_BUILD_PATH/rootfs
-
-    if [ -d $CONTAINER_SOURCE_PATH/postinstall ]
-    then
-        cp --archive $CONTAINER_SOURCE_PATH/postinstall $CONTAINER_ROOTFS
-        if [ -f $CONTAINER_ROOTFS/postinstall/run.list ]
-        then
-            grep -v '^#' $CONTAINER_ROOTFS/postinstall/run.list | while read LINE
-            do
-                TGT_HOST=$(echo "$LINE" | cut -f 1 -d ' ')
-                TGT_USER=$(echo "$LINE" | cut -f 2 -d ' ')
-                TGT_PATH=$(echo "$LINE" | cut -f 3 -d ' ')
-                ssh -i $SSH_KEYS_PATH/scripts -l $TGT_USER $TGT_HOST $TGT_PATH
-            done
-        fi
-        if [ -f $CONTAINER_ROOTFS/postinstall/copy.list ]
-        then
-            grep -v '^#' $CONTAINER_ROOTFS/postinstall/copy.list | while read LINE
-            do
-                SRC_HOST=$(echo "$LINE" | cut -f 1 -d ' ')
-                SRC_PATH=$(echo "$LINE" | cut -f 2 -d ' ')
-                TGT_PATH=$(echo "$LINE" | cut -f 3 -d ' ')
-                if [ ! -d $CONTAINER_ROOTFS/postinstall/install/$TGT_PATH ]
-                then
-                    mkdir $CONTAINER_ROOTFS/postinstall/install/$TGT_PATH
-                fi
-                scp -pr -i $SSH_KEYS_PATH/scripts \
-                    root@${SRC_HOST}:$SRC_PATH \
-                    $CONTAINER_ROOTFS/postinstall/install/$TGT_PATH
-            done
-        fi
-    fi
-    if [ -d $CONTAINER_ROOTFS/postinstall ]
-    then
-        chmod 755 $CONTAINER_ROOTFS/postinstall/*.sh
-        for SCRIPT in $CONTAINER_ROOTFS/postinstall/*.sh
-        do
-            POSTINSTALL_SCRIPT=$(echo $SCRIPT | sed "s|^$CONTAINER_ROOTFS||")
-            echo chroot $CONTAINER_ROOTFS $POSTINSTALL_SCRIPT
-            chroot $CONTAINER_ROOTFS $POSTINSTALL_SCRIPT
-        done
-    fi
-
-    umount $CONTAINER_ROOTFS/dev
-    umount $CONTAINER_ROOTFS/proc
-}
-
-firstboot()
-{
-    ENV_FILE=$1
-
-    source $ENV_FILE
-    CONTAINER_ROOTFS=$CONTAINER_PATH/rootfs
-
-    if [ -d $CONTAINER_SOURCE_PATH/firstboot ]
-    then
-        cp --archive $CONTAINER_SOURCE_PATH/firstboot $CONTAINER_ROOTFS
-        chmod 755 $CONTAINER_ROOTFS/firstboot/*.sh
-        for SCRIPT in $CONTAINER_ROOTFS/firstboot/*.sh
-        do
-            FIRSTBOOT_SCRIPT=$(echo $SCRIPT | sed "s|^$CONTAINER_ROOTFS||")
-            echo lxc-attach --name=$CONTAINER_NAME -- $FIRSTBOOT_SCRIPT
-            lxc-attach --name=$CONTAINER_NAME -- $FIRSTBOOT_SCRIPT
-        done
-    fi
-}
diff --git a/scripts/update-base.sh b/scripts/update-base.sh
new file mode 100755
index 0000000..b3fd22e
--- /dev/null
+++ b/scripts/update-base.sh
@@ -0,0 +1,178 @@
+#!/bin/sh
+
+
+USAGE="Usage: $(basename $0) <container operating system>"
+
+if [ $# -ne 1 ]
+then
+    echo "$USAGE" >&2
+    exit 1
+fi
+
+if [ ! -f /etc/lxc/lxc.conf ]
+then
+    echo "No lxc system configuration found" >&2
+    exit 1
+fi
+
+update_packages()
+{
+    case "$DISTRIBUTION" in
+        "CentOS")
+            YUM_CONFIG=$SCRIPT_PATH/yum.conf.centos
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
+            yum --assumeyes \
+                --config=$YUM_CONFIG \
+                --disablerepo=* \
+                --enablerepo=local-* \
+                --installroot=$CONTAINER_PATH \
+                --releasever=$YUM_RELEASEVER \
+                update
+            yum --assumeyes \
+                --config=$YUM_CONFIG \
+                --disablerepo=* \
+                --enablerepo=local-* \
+                --installroot=$CONTAINER_PATH \
+                --releasever=$YUM_RELEASEVER \
+                clean all
+            ;;
+        "Fedora")
+            DNF_CONFIG=$SCRIPT_PATH/dnf.conf.fedora
+            DNF_RELEASEVER=$DISTRIBUTION_VERSION
+            dnf --assumeyes \
+                --config=$DNF_CONFIG \
+                --disablerepo=* \
+                --enablerepo=local-* \
+                --installroot=$CONTAINER_PATH \
+                --releasever=$DNF_RELEASEVER \
+                update
+            dnf --assumeyes \
+                --config=$DNF_CONFIG \
+                --disablerepo=* \
+                --enablerepo=local-* \
+                --installroot=$CONTAINER_PATH \
+                --releasever=$DNF_RELEASEVER \
+                clean all
+            ;;
+        "Rocky")
+            YUM_CONFIG=$SCRIPT_PATH/yum.conf.rocky
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
+            yum --assumeyes \
+                --config=$YUM_CONFIG \
+                --disablerepo=* \
+                --enablerepo=local-* \
+                --installroot=$CONTAINER_PATH \
+                --releasever=$YUM_RELEASEVER \
+                update
+            yum --assumeyes \
+                --config=$YUM_CONFIG \
+                --disablerepo=* \
+                --enablerepo=local-* \
+                --installroot=$CONTAINER_PATH \
+                --releasever=$YUM_RELEASEVER \
+                clean all
+            ;;
+    esac
+}
+
+set_variables()
+{
+    CONTAINER_OS_PARAMETER=$1
+
+
+    echo "Setting variables."
+
+    CONTAINER_BASENAME="base"
+    CONTAINER_NAME_PARAMETER="${CONTAINER_BASENAME}.$CONTAINER_OS_PARAMETER"
+
+    LXC_PATH=$(grep '^lxc.lxcpath' /etc/lxc/lxc.conf \
+               | cut -f 2 -d '=' | tr -d ' ')
+
+    SCRIPT_PATH=$(dirname $(realpath $0))
+    BASE_PATH=$(dirname $SCRIPT_PATH)
+    SOURCES_PATH=$BASE_PATH/sources
+
+    CONTAINER_SOURCE_PATH=$SOURCES_PATH/$CONTAINER_NAME_PARAMETER
+
+    if [ ! -d $CONTAINER_SOURCE_PATH ]
+    then
+        echo "No source found for $CONTAINER_NAME_PARAMETER" >&2
+        return 1
+    fi
+
+    if [ ! -f $CONTAINER_SOURCE_PATH/config ]
+    then
+        echo "No config file found for $CONTAINER_NAME_PARAMETER" >&2
+        return 2
+    fi
+
+    if [ ! -f $CONTAINER_SOURCE_PATH/envvars ]
+    then
+        echo "No envvars file found for $CONTAINER_NAME_PARAMETER" >&2
+        return 3
+    fi
+
+    source $CONTAINER_SOURCE_PATH/envvars
+    RC=$?
+    if [ $RC -ne 0 ]
+    then
+        echo "Could not source $CONTAINER_SOURCE_PATH/envvars, rc: $RC" >&2
+        return 4
+    fi
+
+    if [ -z "$DISTRIBUTION" ]
+    then
+        echo "No DISTRIBUTION variable set in envvars file" >&2
+        return 5
+    fi
+    if [ -z "$DISTRIBUTION_VERSION" ]
+    then
+        echo "No DISTRIBUTION_VERSION variable set in envvars file" >&2
+        return 6
+    fi
+
+    case "$DISTRIBUTION" in
+        "CentOS")
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
+            ;;
+        "Fedora")
+            DNF_RELEASEVER=$DISTRIBUTION_VERSION
+            ;;
+        "Rocky")
+            YUM_RELEASEVER=$DISTRIBUTION_VERSION
+            ;;
+        *)
+            echo "Unknown distribution: $DISTRIBUTION" >&2
+            return 7
+            ;;
+    esac
+
+    DISTRIBUTION_FIRST_CHAR=$(echo "$DISTRIBUTION" | cut -c 1 | tr '[A-Z]' '[a-z]')
+    CONTAINER_OS="${DISTRIBUTION_FIRST_CHAR}$DISTRIBUTION_VERSION"
+
+    if [ "$CONTAINER_OS_PARAMETER" != "$CONTAINER_OS" ]
+    then
+        echo "Container operating system mismatch." >&2
+        return 8
+    fi
+
+    CONTAINER_NAME="${CONTAINER_BASENAME}.$CONTAINER_OS"
+
+    CONTAINER_PATH=$LXC_PATH/$CONTAINER_NAME
+
+    echo "All variables set."
+}
+
+set_variables $1
+RC=$?
+if [ $RC -ne 0 ]
+then
+    echo "Could not set variables, rc: $RC" >&2
+    exit $RC
+fi
+
+echo "Starting at $(date)"
+
+update_packages
+
+echo "Finishing at $(date)"