add update relevant replacements

init.sh

@@ -3,6 +3,71 @@
 ICINGAWEB2_FILE_APACHE_DEFAULT=/etc/apache2/sites-available/000-default.conf
 ICINGAWEB2_FILE_APACHE_PORTS=/etc/apache2/ports.conf
 ICINGAWEB2_PORT=8080
+ICINGAWEB2_WEBROOT=/data/usr/icingaweb2
+ICINGAWEB2_WEBROOT_INIT=/data-init/usr/icingaweb2
+
+## the webroot under /data is code from the image, config and state live in
+## /data/etc/icingaweb2 and the database. when the image ships another icingaweb2
+## version, the webroot has to follow, otherwise old assets, templates and modules
+## run against the new php library (e.g. missing css/icinga/csp-config-editor.less).
+## modules which are not part of the image stay untouched
+icingaweb2_update_webroot() {
+    local version_old version_new module_path module
+
+    ## nothing to compare without the webroot template from the image
+    [ -d "$ICINGAWEB2_WEBROOT_INIT" ] || return 0
+
+    if [ ! -d "$ICINGAWEB2_WEBROOT" ]; then
+        echo create icingaweb2 webroot from image
+        mkdir -p "$ICINGAWEB2_WEBROOT"
+        cp -a "$ICINGAWEB2_WEBROOT_INIT"/. "$ICINGAWEB2_WEBROOT"/
+        chown -R 33:33 "$ICINGAWEB2_WEBROOT"
+        return 0
+    fi
+
+    version_old="$(cat "$ICINGAWEB2_WEBROOT/VERSION" 2>/dev/null)"
+    version_new="$(cat "$ICINGAWEB2_WEBROOT_INIT/VERSION" 2>/dev/null)"
+
+    ## skip when the image carries no version to compare against
+    [ -n "$version_new" ] || return 0
+
+    ## skip when the webroot already runs the version from the image
+    [ "$version_old" != "$version_new" ] || return 0
+
+    echo "replace icingaweb2 webroot: ${version_old:-unknown} -> $version_new"
+
+    ## keep one backup of the replaced webroot for comparisons
+    rm -rf "${ICINGAWEB2_WEBROOT}.bak"
+    if ! cp -ax "$ICINGAWEB2_WEBROOT" "${ICINGAWEB2_WEBROOT}.bak"; then
+        echo "backup of $ICINGAWEB2_WEBROOT failed, keeping the current webroot" >&2
+        return 1
+    fi
+
+    ## replace the modules shipped by the image, self installed ones are kept
+    for module_path in "$ICINGAWEB2_WEBROOT_INIT"/modules/*/; do
+        [ -d "$module_path" ] || continue
+        module="$(basename "$module_path")"
+        echo "replace module $module"
+        rm -rf "$ICINGAWEB2_WEBROOT/modules/$module"
+    done
+
+    ## VERSION is the marker of this replacement, so it is replaced too
+    rm -rf "$ICINGAWEB2_WEBROOT"/application \
+           "$ICINGAWEB2_WEBROOT"/public \
+           "$ICINGAWEB2_WEBROOT"/schema \
+           "$ICINGAWEB2_WEBROOT"/doc \
+           "$ICINGAWEB2_WEBROOT"/VERSION
+    cp -a "$ICINGAWEB2_WEBROOT_INIT"/. "$ICINGAWEB2_WEBROOT"/
+
+    chown -R 33:33 "$ICINGAWEB2_WEBROOT"
+
+    for module_path in "$ICINGAWEB2_WEBROOT"/modules/*/; do
+        [ -d "$module_path" ] || continue
+        module="$(basename "$module_path")"
+        [ -d "$ICINGAWEB2_WEBROOT_INIT/modules/$module" ] \
+            || echo "keep module $module (not part of the image)"
+    done
+}
 
 ## init icinga config files if need
 if [ -z "$(ls -A /data)" ]; then
@@ -32,6 +97,11 @@ if [ -z "$(ls -A /data)" ]; then
     fi
 fi
 
+## follow the icingaweb2 version of the image, also when /data is already populated
+if ! icingaweb2_update_webroot; then
+    echo "warning: icingaweb2 webroot does not match the image version" >&2
+fi
+
 ## apache setup
 if [ ! -z "$ICINGAWEB2_PORT" ]; then
     echo set icingaweb2 apache ports