update header comment and root check output

template-update.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-### update script for <ab-container> utility scripts
+### update script for <ab-container> container and utility scripts
 # version x.y.z
 # script by Asif Bacchus
 # usage of this script is subject to the license terms found at:
@@ -15,6 +15,13 @@ if ! command -v wget > /dev/null 2>&1; then
     exit 1
 fi
 
+# is user root or in the docker group?
+if [ ! "$( id -u )" -eq 0 ]; then
+    if ! id -Gn | grep docker > /dev/null; then
+        consoleError '1' "You must either be root or in the 'docker' group to pull container updates."
+    fi
+fi
+
 # zero counters
 updatesAvailable=0
 downloadFailed=0
@@ -24,6 +31,7 @@ updateSuccess=0
 
 # reference constants
 containerName=''
+containerUpdatePath='docker.asifbacchus.app/...'
 server='https://git.asifbacchus.app/ab-docker/scripts/raw/branch/master/'
 checksumFilename='checksums.sha256'
 
@@ -32,10 +40,23 @@ localScriptName='update.sh'
 repoScriptName="${containerName}-update.sh"
 updateFiles=""
 
-printf "\n*** Updating %s container service scripts ***\n\n" "$containerName"
+
+### update container
+printf "\n*** Updating %s container and service scripts ***\n\n" "$containerName"
+
+printf "Updating container:\n"
+if ! docker pull "$containerUpdatePath"; then
+    printf "There was an error updating the container. Try again later.\n\n"
+    exit 1
+else
+    "Container updated!\n"
+fi
 
 
-### download latest checksums
+### update scripts
+printf "Updating %s service scripts\n" "$containerName"
+
+## download latest checksums
 printf "Getting latest checksums from ab-git server... "
 if ! wget --quiet --tries=3 --timeout=10 -N "${server}${checksumFilename}"; then
     printf "[ERROR]\n"
@@ -45,8 +66,7 @@ else
     printf "[OK]\n"
 fi
 
-
-### check for updates to this script
+## check for updates to this script
 printf "Checking for updates to this script... "
 repoScriptChecksum=$( grep "$repoScriptName" "$checksumFilename" | grep -o '^\S*' )
 localScriptChecksum=$( sha256sum "$localScriptName" | grep -o '^\S*' )
@@ -72,8 +92,7 @@ else
     fi
 fi
 
-
-### update files
+## update files
 set -- dummy $updateFiles
 shift
 for file; do