fix-up & enhance advanced error handling

new (internal used) functions:
- _exit
- _exit_report
- _exit_sigint

these are used to fix several (wrong) error handlings.

new environment variable:
- UNATTENDED_PATCHING

by default we assume unattended patching, i.e. if an error occurs during
the patch, reset or any other process we will report the error and
auto close the shell. this is needed as we source functions and code and
so cannot simply terminate a master process. instead the whole shell will
be terminated so if an error occurs nothing else will be executed (and you
should notice easily that something is wrong).

without that a (serious) error can still continue the rest of a function
and you likely not even noticing the error itself.

you can use:

export UNATTENDED_PATCHING=0

before or after sourcing init.sh and it will *NOT* auto-close the shell.
that way you can check the output and fix any issues.

Signed-off-by: steadfasterX <steadfasterX@gmail.com>

Scripts/Common/Functions.sh

@@ -21,11 +21,22 @@ _fetchError(){
     local error_line_number="$2";
     local last_func="$3";
     local file=$(echo "$4" | sed "s#$DOS_WORKSPACE_ROOT#\$DOS_WORKSPACE_ROOT#g");
+
+    # ignore when pressing TAB or sim.
+    if [[ "$file" =~ .*bash_completion ]];then return; fi
+    case $last_func in
+	command_not_found_handle|_filedir) return;;
+    esac
+
     if [ ! -z "$last_func" ] && [ ! -z "$file" ];then
 	echo -e "\e[0;31mERROR: $file -> ${last_func}() ended with status >${last_status}< at line >$((error_line_number -1))<\e[0m";
+    elif [ ! -z "$last_func" ];then
+	echo -e "\e[0;31mERROR: ${last_func}() ended with status >${last_status}< at line >$((error_line_number -1))<\e[0m";
     else
 	echo -e "\e[0;31mERROR: last command ended with status >${last_status}< at line >$((error_line_number -1))<\e[0m";
     fi
+    export TR_ERR=$last_status
+    _exit_report
 }
 export -f _fetchError;
 
@@ -72,7 +83,7 @@ enterAndClear() {
 export -f enterAndClear;
 
 gitReset() {
-	git add -A && git reset --hard;
+	(git add -A && git reset --hard) || true;
 }
 export -f gitReset;
 
@@ -86,16 +97,22 @@ applyPatchReal() {
 					git format-patch -1 HEAD --zero-commit --no-signature --output="$currentWorkingPatch";
 				fi;
 			fi;
+		else
+		    echo "Applying (git am): $currentWorkingPatch - FAILED"
+		    git am --abort || true
+		    echo "Applying (patch fallback): $currentWorkingPatch"
+		    patch -r - --no-backup-if-mismatch --forward --ignore-whitespace --verbose -p1 < $currentWorkingPatch
 		fi;
 	else
-		git apply "$@";
 		echo "Applying (as diff): $currentWorkingPatch";
+		git apply "$@";
 	fi;
 }
 export -f applyPatchReal;
 
 applyPatch() {
 	currentWorkingPatch=$1;
+	set -E
 	if [ -f "$currentWorkingPatch" ]; then
 		if git apply --check "$@" &> /dev/null; then
 			applyPatchReal "$@";
@@ -108,11 +125,13 @@ applyPatch() {
 					echo "Applied (as 3way): $currentWorkingPatch";
 				else
 					echo -e "\e[0;31mERROR: Cannot apply: $currentWorkingPatch\e[0m";
+					false
 				fi;
 			fi;
 		fi;
 	else
 		echo -e "\e[0;31mERROR: Patch doesn't exist: $currentWorkingPatch\e[0m";
+		false
 	fi;
 }
 export -f applyPatch;

Scripts/init.sh

@@ -111,14 +111,15 @@ umask 0022;
 
 export TR_ERR=0
 export TR_PID=$$
+unset nokill
+if [ -z "$UNATTENDED_PATCHING" ];then export UNATTENDED_PATCHING=1;fi
 
 set -E;	#required for resetEnv()
 resetEnv(){
     trap - ERR EXIT USR2 SIGINT SIGHUP TERM
     echo -e "\n\e[0;32mThe environment has been reset.\e[0m\nRemember to always '\e[0;31msource ../../Scripts/init.sh\e[0m' before building.\n"
     set +E +f
-}
-export -f resetEnv
+}; export -f resetEnv
 
 # print result
 # will also ensure the corresponding status code gets returned properly
@@ -129,8 +130,47 @@ _errorReport(){
 	echo -e "\n\e[0;32m[FINAL RESULT] No error detected (please check the above output nevertheless!)\e[0m"
     fi
     return $TR_ERR
-}
-export -f _errorReport
+}; export -f _errorReport
+
+# exit
+_exit(){
+    if [ "$1" == "noreset" ] || [ $TR_ERR -eq 0 ] ;then
+	echo -e "Ended with $TR_ERR.\nThe shell env has NOT been reset, type: resetEnv if needed.\n"
+    else
+	if [ -z "$nokill" ];then nokill=0;fi
+	resetEnv
+	echo -e "\nExecution has been STOPPED (TR_ERR=$TR_ERR)."
+	if [ "$UNATTENDED_PATCHING" -eq 1 ];then
+	    echo -e "\n\e[0;31mPressing any key or waiting 10s will close this shell (set UNATTENDED_PATCHING=0 to disable auto-close)!\e[0m"
+	    read -t 10 -p "- press any key to exit the shell NOW (auto closes after 10s) -" DUMMY || true
+	else
+	    read -p "- press any key to exit the shell NOW -" DUMMY || true
+	fi
+	_SPIDS=$(ps -s $TR_PID -o pid= | tr '\n' ' ')
+	if [ -z "$_SPIDS" ];then
+	    echo -e "... ok, no childs running (I am: $TR_PID)"
+	else
+	    echo -e "... killing childs: $_SPIDS"
+	    kill -9 $_SPIDS
+	fi
+	if [ $nokill -eq 0 ];then
+	    echo "... killing shell: $TR_PID"
+	    kill -9 $TR_PID
+	fi
+    fi
+}; export -f _exit
+
+# exit & reset & report
+_exit_report(){
+    _errorReport
+    _exit
+}; export -f _exit_report
+
+# exit without reset/kill
+_exit_sigint(){
+    echo -e "\n\nCTRL+C pressed or process has been terminated.."
+    _exit noreset
+}; export _exit_sigint
 
 # trap and print errors
 # ERR: needed to fetch aborts when set -e is set
@@ -138,8 +178,8 @@ trap 'E=$?; \
       [ $E -ne 0 ] && _fetchError $E $LINENO $FUNCNAME $BASH_SOURCE \
       && export TR_ERR=$((TR_ERR + $E))' EXIT ERR
 
-trap _errorReport USR2
-trap resetEnv SIGINT SIGHUP TERM
+trap _exit_report SIGUSR2 USR2
+trap _exit_sigint SIGINT SIGHUP TERM
 
 gpgVerifyGitHead() {
 	if [ -r "$DOS_TMP_GNUPG/pubring.kbx" ]; then