__nextcloud: fix shellcheck

Mostly simply because of php inline code .. also because of the argument
generation for the installation setup.

type/__nextcloud/explorer/config

@@ -5,7 +5,6 @@
 
 
 # Get the installdir
-user="$( cat "$__object/parameter/user" )"
 installdir="$( "$__type_explorer/installdir" )"
 
 # Check if the tools are available
@@ -14,9 +13,11 @@ if [ -d "$installdir" ]; then
 
     # if those files exist, everything should be good
     if [ -f "occ" ] && [ -f "config/config.php" ]; then
-        # dump out config instead of fuzz every possible option through
+        # Dump out config instead of fuzz every possible option through
         # `occ config:system:get`. Or parse through the whole json or
         # yaml-like output of `occ config:list system --private`.
+        #
+        # shellcheck disable=SC2016  # cause of the php inline code
         php -r 'require("lib/private/Config.php"); $config = new OC\Config("config/");
                 function printv($key, $value) {printf("%s = %s\n", $key, $value);}
                 foreach($config->getKeys() as $key){

type/__nextcloud/explorer/version

@@ -13,7 +13,8 @@ if [ -d "$installdir" ]; then
 
     # if those files exist, everything should be good
     if [ -f "occ" ] && [ -f "version.php" ]; then
-        # detect php version with the version file
+        # Detect php version with the version file.
+        # shellcheck disable=SC2016  # cause of the php inline code
         php -r 'require("version.php"); print($OC_VersionString);'
     fi
 fi

type/__nextcloud/gencode-remote

@@ -91,6 +91,8 @@ fi
 
 # Check if the nextcloud application needs to be installed.
 # This checks the state of the configuration, not of the directory.
+#
+# shellcheck disable=SC2089  # disabled to write args string
 if ! grep -q -F "installed = 1" "$__object/explorer/config"; then
     # argument construction
     occ_install_args=""
@@ -159,8 +161,9 @@ if ! grep -q -F "installed = 1" "$__object/explorer/config"; then
     fi
 
 
-    # Execute the install command
-    occ maintenance:install $occ_install_args
+    # Execute the install command.
+    # generated parameters will be splited in the remote shell
+    occ maintenance:install "$occ_install_args"
 
     # send install message
     echo installed >> "$__messages_out"

type/__nextcloud/map-conf-changes.sh

@@ -57,6 +57,7 @@ conf_base() {
         value="$(cat "$__object/parameter/$1")"
         if ! testparam "$2" "$value"; then
             # set it because it does not exist
+            # shellcheck disable=SC2059  # $3 contains patterns
             printf "php occ config:system:$3\n" "$2" "$value"
         fi
     else
@@ -122,6 +123,7 @@ conf_array() {
         # else, default behaviour of the array
         else
             # save counter of the next free index
+            # shellcheck disable=SC1004  # the \ is required for awk
             counter=$( awk -v FS=" = " -v name="$2" '
                         BEGIN { counter = 0 }
                         split($1, header, "|") == 2 && header[1] ~ /^[[:digit:]]+$/ && header[2] == name \
@@ -156,6 +158,8 @@ conf_array() {
         if [ -z "$install" ]; then
             # interate through the leftover values
             # remove them, as they should not exist (at least can be)
+            #
+            # shellcheck disable=SC2034  # $equal left for readability
             while read -r start equal value; do
                 # remove those specific elements from the array
                 printf "php occ config:system:delete '%s' '%s' --error-if-not-exists\n" \