Revert "- removed debug ouptut"

This reverts commit 4c09537776.

home_external/.bash_aliases

@@ -40,6 +40,11 @@ alias dirsizes='du -kh --apparent-size --max-depth=1 | sort -hr'
 alias start_x11_vnc="x11vnc -many -display :0 -no6 -rfbport 5900 -auth /var/run/lightdm/root/:0 -rfbauth $HOME/.vnc/passwd"
 
 
+commandExists() {
+   type $1 2 >& 1 > /dev/null
+}
+
+
 rsyncLink() {
    source=$1;
    linkSource="$(realpath $source)";
@@ -47,18 +52,25 @@ rsyncLink() {
    shift;
    dest=$1;
    shift;
-   echo "rsync $DEFAULT_RSYNC --one-file-system --link-dest=$linkSource $source $dest $*;"
    rsync $DEFAULT_RSYNC --one-file-system --link-dest=$linkSource $source $dest $*;
 }
 
 
 updateSystem() {
+   executeAndNotify "doUpdateSystem $1" "system updated" "system update failed"
+}
+
+
+doUpdateSystem() {
    updatePackages $1;
    updateFlatpak $1;
 }
 
 
 updateFlatpak() {
+   if [[ ! $(commandExists flatpak) ]]; then
+      return 1;
+   fi
    noconfirm=
    if [[ $1 == "-y" ]]; then
       noconfirm="--assumeyes";
@@ -76,7 +88,7 @@ doUpdateFlatpak() {
 # executes command and notifies upon failure
 execute() {
    dir="$(pwd)";
-   dir=${dir##*/};
+   dir=${dir##*/}; # cut off previous path (/path/to/foo.txt -> foo.txt)
    if [[ -n "$2" ]]; then
       errLog=$2;
    else
@@ -100,17 +112,9 @@ executeAndNotify () {
       winLog="execution of \"$1\" succeeded";
    fi
 
-   echo ""
-   echo "******************************************"
-   echo "executeAndNotify \"$1\" \"$winLog\" \"$3\""
-   echo "******************************************"
-   echo ""
-
    if ! execute "$1" "$3"; then # arguments in quotes so they are interpreted as ONE argument each by execute()
-      echo "failed \"$1\" -> \"$3\""
       return 1;
    fi
-   echo "succeeded \"$1\" -> \"$winLog\""
    notifyInfo "$dir: $winLog";
 }
 
@@ -123,11 +127,19 @@ finds () {
 
 # sends a desktop-notification with an icon signalling an error
 notifyError () {
-   notify-send "$1" --icon=data-warning;
+   if [[ ! $(commandExists notify-send) ]]; then
+      echo "ERROR: $1";
+   else
+      notify-send "$1" --icon=data-warning;
+   fi
 }
 
 
 # sends a desktop-notification with an icon signalling a simple information
 notifyInfo () {
-   notify-send "$1" --icon=preferences-desktop-notification;
+   if [[ ! $(commandExists notify-send) ]]; then
+      echo "INFO: $1";
+   else
+      notify-send "$1" --icon=preferences-desktop-notification;
+   fi
 }