Make docker-entrypoint.sh posix compliant

docker-entrypoint.sh

@@ -1,29 +1,31 @@
-#!/bin/bash
-set -e
+#!/bin/sh
+set -eu
 
 # version_greater A B returns whether A > B
-function version_greater() {
-	[[ "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1" ]];
+version_greater() {
+	[ "$(printf '%s\n' "$@" | sort -t '.' -n -k1,1 -k2,2 -k3,3 -k4,4 | head -n 1)" != "$1" ]
 }
 
 # return true if specified directory is empty
-function directory_empty() {
-    [ -n "$(find "$1"/ -prune -empty)" ]
+directory_empty() {
+    [ -z "$(ls -A "$1/")" ]
 }
 
-function run_as() {
-  if [[ $EUID -eq 0 ]]; then
-    su - www-data -s /bin/bash -c "$1"
+run_as() {
+  if [ "$(id -u)" = 0 ]; then
+    su - www-data -s /bin/sh -c "$1"
   else
-    bash -c "$1"
+    sh -c "$1"
   fi
 }
 
-installed_version="0.0.0~unknown"
+installed_version="0.0.0.0"
 if [ -f /var/www/html/version.php ]; then
-    installed_version=$(php -r 'require "/var/www/html/version.php"; echo implode(".", $OC_Version);')
+    # shellcheck disable=SC2016
+    installed_version="$(php -r 'require "/var/www/html/version.php"; echo implode(".", $OC_Version);')"
 fi
-image_version=$(php -r 'require "/usr/src/nextcloud/version.php"; echo implode(".", $OC_Version);')
+# shellcheck disable=SC2016
+image_version="$(php -r 'require "/usr/src/nextcloud/version.php"; echo implode(".", $OC_Version);')"
 
 if version_greater "$installed_version" "$image_version"; then
     echo "Can't start Nextcloud because the version of the data ($installed_version) is higher than the docker image version ($image_version) and downgrading is not supported. Are you sure you have pulled the newest image version?"
@@ -31,10 +33,10 @@ if version_greater "$installed_version" "$image_version"; then
 fi
 
 if version_greater "$image_version" "$installed_version"; then
-    if [ "$installed_version" != "0.0.0~unknown" ]; then
-        run_as 'php /var/www/html/occ app:list' > /tmp/list_before
+    if [ "$installed_version" != "0.0.0.0" ]; then
+        run_as 'php /var/www/html/occ app:list' | sed -n "/Enabled:/,/Disabled:/p" > /tmp/list_before
     fi
-    if [[ $EUID -eq 0 ]]; then
+    if [ "$(id -u)" = 0 ]; then
       rsync_options="-rlDog --chown www-data:root"
     else
       rsync_options="-rlD"
@@ -42,17 +44,17 @@ if version_greater "$image_version" "$installed_version"; then
     rsync $rsync_options --delete --exclude /config/ --exclude /data/ --exclude /custom_apps/ --exclude /themes/ /usr/src/nextcloud/ /var/www/html/
 
     for dir in config data custom_apps themes; do
-        if [ ! -d /var/www/html/"$dir" ] || directory_empty /var/www/html/"$dir"; then
-            rsync $rsync_options --include /"$dir"/ --exclude '/*' /usr/src/nextcloud/ /var/www/html/
+        if [ ! -d "/var/www/html/$dir" ] || directory_empty "/var/www/html/$dir"; then
+            rsync $rsync_options --include "/$dir/" --exclude '/*' /usr/src/nextcloud/ /var/www/html/
         fi
     done
 
-    if [ "$installed_version" != "0.0.0~unknown" ]; then
+    if [ "$installed_version" != "0.0.0.0" ]; then
         run_as 'php /var/www/html/occ upgrade --no-app-disable'
 
-        run_as 'php /var/www/html/occ app:list' > /tmp/list_after
+        run_as 'php /var/www/html/occ app:list' | sed -n "/Enabled:/,/Disabled:/p" > /tmp/list_after
         echo "The following apps have beed disabled:"
-        diff <(sed -n "/Enabled:/,/Disabled:/p" /tmp/list_before) <(sed -n "/Enabled:/,/Disabled:/p" /tmp/list_after) | grep '<' | cut -d- -f2 | cut -d: -f1
+        diff /tmp/list_before /tmp/list_after | grep '<' | cut -d- -f2 | cut -d: -f1
         rm -f /tmp/list_before /tmp/list_after
     fi
 fi