standardized messages

Dockerfile

@@ -4,7 +4,7 @@ RUN apt-get update
 RUN apt-get install -y \
 	android-tools-adb \
 	android-tools-fastboot
-RUN pip3 install protobuf -q
+RUN pip3 install protobuf
 COPY . /magisk
 WORKDIR /magisk
 CMD bash reinstall-magisk-on-lineageos

reinstall-magisk-on-lineageos

@@ -5,6 +5,10 @@ set -e
 PHONE_ADB_SERIAL_NUMBER=${ADB_DEVICE} # The adb serial number can be found by running `adb devices`.
 if [$PHONE_ADB_SERIAL_NUMBER = '']; then
     PHONE_ADB_SERIAL_NUMBER=$(echo $(adb devices) | sed -rn 's/(^|(.* ))([^ ]*) device(( .*)|$)/\3/; T; p; q')
+    if [[ -n $PHONE_ADB_SERIAL_NUMBER ]]
+        print_message "ERROR: no suitable phone connected"
+        exit 1
+    fi
 fi
 
 print_message() {
@@ -154,15 +158,14 @@ check_magisk_app() {
     magisk_package_name_count=$(adb -s "$PHONE_ADB_SERIAL_NUMBER" shell pm list packages "$magisk_package_name" | wc -l)
     if [ "${magisk_package_name_count}" -eq 1 ]
     then
-        print_message " [OK] Magisk app seems to be installed on selected phone"
+        print_message "Magisk app seems to be installed on selected phone"
     elif [ "${magisk_package_name_count}" -eq 0 ]
     then
-        print_message " [ERROR] Magisk app seems not installed on selected phone. Exiting."
+        print_message "ERROR: Magisk app seems not installed on selected phone."
         exit -1
     else
-        print_message " [ERROR] More than one Magisk app entry is present:"
+        print_message "ERROR: More than one Magisk app entry is present:"
         adb -s "$PHONE_ADB_SERIAL_NUMBER" shell pm list packages "$magisk_package_name"
-        print_message "Exiting."
         exit -1
     fi
 }