utils/lib.sh: make uWSGI installation available for all distros

support: ubuntu, debin, fedora, archlinux

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Makefile

@@ -84,11 +84,11 @@ test.pylint: pyenvinstall
 	$(call cmd,pylint,searx/testing.py)
 
 test.sh:
-	shellcheck -x utils/lxc.sh
 	shellcheck -x utils/lib.sh
 	shellcheck -x utils/filtron.sh
 	shellcheck -x utils/searx.sh
 	shellcheck -x utils/morty.sh
+	shellcheck -x utils/lxc.sh
 	shellcheck -x .config.sh
 
 test.pep8: pyenvinstall

utils/lib.sh

@@ -692,18 +692,37 @@ apache_dissable_site() {
 # -----
 
 uWSGI_SETUP="${uWSGI_SETUP:=/etc/uwsgi}"
+uWSGI_USER=
+uWSGI_GROUP=
+
+# How distros manage uWSGI apps is very different.  From uWSGI POV read:
+# - https://uwsgi-docs.readthedocs.io/en/latest/Management.html
 
 case $DIST_ID-$DIST_VERS in
     ubuntu-*|debian-*)
         # init.d --> /usr/share/doc/uwsgi/README.Debian.gz
+        # For uWSGI debian uses the LSB init process, this might be changed
+        # one day, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=833067
         uWSGI_APPS_AVAILABLE="${uWSGI_SETUP}/apps-available"
         uWSGI_APPS_ENABLED="${uWSGI_SETUP}/apps-enabled"
         ;;
     arch-*)
         # systemd --> /usr/lib/systemd/system/uwsgi@.service
-        uWSGI_APPS_AVAILABLE="${uWSGI_SETUP}"
+        # For uWSGI archlinux uses systemd template units, see
+        # - http://0pointer.de/blog/projects/instances.html
+        # - https://uwsgi-docs.readthedocs.io/en/latest/Systemd.html#one-service-per-app-in-systemd
+        uWSGI_APPS_AVAILABLE="${uWSGI_SETUP}/apps-archlinux"
         uWSGI_APPS_ENABLED="${uWSGI_SETUP}"
         ;;
+    fedora-*)
+        # systemd --> /usr/lib/systemd/system/uwsgi.service
+        # The unit file starts uWSGI in emperor mode (/etc/uwsgi.ini), see
+        # - https://uwsgi-docs.readthedocs.io/en/latest/Emperor.html
+        uWSGI_APPS_AVAILABLE="${uWSGI_SETUP}/apps-available"
+        uWSGI_APPS_ENABLED="${uWSGI_SETUP}.d"
+        uWSGI_USER="uwsgi"
+        uWSGI_GROUP="uwsgi"
+        ;;
     *)
         info_msg "$DIST_ID-$DIST_VERS: uWSGI not yet implemented"
         ;;
@@ -723,10 +742,25 @@ uWSGI_restart() {
 
     case $DIST_ID-$DIST_VERS in
         ubuntu-*|debian-*)
+            # the 'service' method seems broken in that way, that it (re-)starts
+            # the whole uwsgi process.
             service uwsgi restart "${CONF%.*}"
             ;;
         arch-*)
+            # restart systemd template instance
+            if uWSGI_app_available "${CONF}"; then
                 systemctl restart "uwsgi@${CONF%.*}"
+            else
+                info_msg "in systemd template mode: ${CONF} not installed (nothing to restart)"
+            fi
+            ;;
+        fedora-*)
+            # in emperor mode, just touch the file to restart
+            if uWSGI_app_enabled "${CONF}"; then
+                touch "${uWSGI_APPS_ENABLED}/${CONF}"
+            else
+                info_msg "in uWSGI emperor mode: ${CONF} not installed (nothing to restart)"
+            fi
             ;;
         *)
             err_msg "$DIST_ID-$DIST_VERS: uWSGI not yet implemented"
@@ -765,7 +799,7 @@ uWSGI_install_app() {
                      root root 644
     uWSGI_enable_app "${pos_args[1]}"
     uWSGI_restart "${pos_args[1]}"
-    info_msg "installed uWSGI app: ${pos_args[1]}"
+    info_msg "uWSGI app: ${pos_args[1]} is installed"
 }
 
 uWSGI_remove_app() {
@@ -797,6 +831,10 @@ uWSGI_app_enabled() {
             systemctl -q is-enabled "uwsgi@${CONF%.*}"
             exit_val=$?
             ;;
+        fedora-*)
+            [[ -f "${uWSGI_APPS_ENABLED}/${CONF}" ]]
+            exit_val=$?
+            ;;
         *)
             # FIXME
             err_msg "$DIST_ID-$DIST_VERS: uWSGI not yet implemented"
@@ -821,14 +859,22 @@ uWSGI_enable_app() {
     case $DIST_ID-$DIST_VERS in
         ubuntu-*|debian-*)
             mkdir -p "${uWSGI_APPS_ENABLED}"
-            pushd "${uWSGI_APPS_ENABLED}" >/dev/null
+            rm -f "${uWSGI_APPS_ENABLED}/${CONF}"
-            rm -f "$CONF"
+            ln -s "${uWSGI_APPS_AVAILABLE}/${CONF}" "${uWSGI_APPS_ENABLED}/${CONF}"
-            ln -s "${uWSGI_APPS_AVAILABLE}/${CONF}" .
-            popd >/dev/null
             info_msg "enabled uWSGI app: ${CONF} (restart required)"
             ;;
         arch-*)
-            systemctl enable "uwsgi@${CONF%.*}"
+            mkdir -p "${uWSGI_APPS_ENABLED}"
+            rm -f "${uWSGI_APPS_ENABLED}/${CONF}"
+            ln -s "${uWSGI_APPS_AVAILABLE}/${CONF}" "${uWSGI_APPS_ENABLED}/${CONF}"
+            info_msg "enabled uWSGI app: ${CONF} (restart required)"
+            ;;
+        fedora-*)
+            mkdir -p "${uWSGI_APPS_ENABLED}"
+            rm -f "${uWSGI_APPS_ENABLED}/${CONF}"
+            ln -s "${uWSGI_APPS_AVAILABLE}/${CONF}" "${uWSGI_APPS_ENABLED}/${CONF}"
+            chown "${uWSGI_USER}:${uWSGI_GROUP}" "${uWSGI_APPS_ENABLED}/${CONF}"
+            info_msg "enabled uWSGI app: ${CONF}"
             ;;
         *)
             # FIXME
@@ -843,7 +889,7 @@ uWSGI_disable_app() {
 
     local CONF="$1"
     if [[ -z $CONF ]]; then
-        err_msg "uWSGI_enable_app: missing arguments"
+        err_msg "uWSGI_disable_app: missing arguments"
         return 42
     fi
 
@@ -856,6 +902,11 @@ uWSGI_disable_app() {
         arch-*)
             systemctl stop "uwsgi@${CONF%.*}"
             systemctl disable "uwsgi@${CONF%.*}"
+            rm -f "${uWSGI_APPS_ENABLED}/${CONF}"
+            ;;
+        fedora-*)
+            # in emperor mode, just remove the app.ini file
+            rm -f "${uWSGI_APPS_ENABLED}/${CONF}"
             ;;
         *)
             # FIXME

utils/lxc.sh

@@ -344,7 +344,7 @@ add_subordinate_ids() {
 
 del_subordinate_ids() {
     local out
-    local exit_value
+    local exit_val
     if  grep "root:${HOST_USER_ID}:1" /etc/subuid -qs; then
         # TODO: root user is always in use by process 1, how can we remove subordinates?
         info_msg "remove lxd permission to map ${HOST_USER_ID}'s user/group id through"

utils/morty.sh

@@ -96,6 +96,11 @@ To activate morty in searx, add result_proxy to your settings.yml::
   result_proxy:
       url : ${PUBLIC_URL_MORTY}/
 
+  server:
+      ...
+      image_proxy : True # Proxying image results through searx
+      ...
+
 further read: ${DOCS_URL}/admin/morty.html
 
 EOF

utils/searx.sh

@@ -43,6 +43,9 @@ case $DIST_ID in
  git build-essential libxslt-dev zlib1g-dev libffi-dev libssl-dev "
         ;;
     arch)           # pacman packages
+        # FIXME:
+        # - /usr/lib/uwsgi/http_plugin.so: cannot open shared object file: No such file or directory !!!
+        # - /usr/lib/uwsgi/systemd_logger_plugin.so: cannot open shared object file: No such file or directory !!!
         SEARX_PACKAGES="\
  python python-pip python-lxml python-babel \
  uwsgi uwsgi-plugin-python \

utils/templates/etc/uwsgi/apps-archlinux/searx.ini

@@ -0,0 +1,66 @@
+[uwsgi]
+
+# uWSGI core
+# ----------
+#
+# https://uwsgi-docs.readthedocs.io/en/latest/Options.html#uwsgi-core
+
+# Who will run the code
+uid = ${SERVICE_USER}
+gid = ${SERVICE_GROUP}
+
+# chdir to specified directory before apps loading
+chdir = ${SEARX_SRC}/searx
+
+# searx configuration (settings.yml)
+env = SEARX_SETTINGS_PATH=${SEARX_SETTINGS_PATH}
+
+# disable logging for privacy
+logger = systemd
+disable-logging = false
+
+# The right granted on the created socket
+chmod-socket = 666
+
+# Plugin to use and interpretor config
+single-interpreter = true
+
+# enable master process
+master = true
+
+# load apps in each worker instead of the master
+lazy-apps = true
+
+# load uWSGI plugins
+plugin = python,http,systemd_logger
+
+# By default the Python plugin does not initialize the GIL.  This means your
+# app-generated threads will not run.  If you need threads, remember to enable
+# them with enable-threads.  Running uWSGI in multithreading mode (with the
+# threads options) will automatically enable threading support. This *strange*
+# default behaviour is for performance reasons.
+enable-threads = true
+
+
+# plugin: python
+# --------------
+#
+# https://uwsgi-docs.readthedocs.io/en/latest/Options.html#plugin-python
+
+# load a WSGI module
+module = searx.webapp
+
+# set PYTHONHOME/virtualenv
+virtualenv = ${SEARX_PYENV}
+
+# add directory (or glob) to pythonpath
+pythonpath = ${SEARX_SRC}
+
+
+# plugin http
+# -----------
+#
+# https://uwsgi-docs.readthedocs.io/en/latest/Options.html#plugin-http
+
+# Native HTTP support: https://uwsgi-docs.readthedocs.io/en/latest/HTTP.html
+http = ${SEARX_INTERNAL_URL}