Process core dump from named which failed to start

When named failed to start and produced core dump, the core file wasn't
processed by GDB because of run.sh script exiting immediately. This
remedies the limitation, simplifies the surrounding code, and makes the
script shellcheck clean.

bin/tests/system/run.sh.in

@@ -115,20 +115,14 @@ eval "$(cd "${srcdir}" && ./get_ports.sh -p "$baseport" -t "$systest")"
 
 restart=false
 
-start_servers_failed() {
-    echoinfo "I:$systest:starting servers failed"
-    echofail "R:$systest:FAIL"
-    echoend  "E:$systest:$(date_with_args)"
-    exit 1
-}
-
 start_servers() {
     echoinfo "I:$systest:starting servers"
     if $restart; then
-        $PERL start.pl --restart --port "$PORT" "$systest" || start_servers_failed
-    else
-        restart=true
-        $PERL start.pl --port "$PORT" "$systest" || start_servers_failed
+        restart_opt="--restart"
+    fi
+    if ! $PERL start.pl ${restart_opt} --port "$PORT" "$systest"; then
+        echoinfo "I:$systest:starting servers failed"
+        return 1
     fi
 }
 
@@ -205,29 +199,38 @@ status=0
 run=0
 # Run the tests
 if [ -r "$systest/tests.sh" ]; then
-    start_servers
-    ( cd "$systest" && $SHELL tests.sh "$@" )
-    status=$?
-    run=$((run+1))
-    stop_servers || status=1
+    if start_servers; then
+        ( cd "$systest" && $SHELL tests.sh "$@" )
+        status=$?
+        run=$((run+1))
+        stop_servers || status=1
+    else
+        status=1
+    fi
 fi
 
-if [ -n "$PYTEST" ]; then
-    run=$((run+1))
-    for test in $(cd "${systest}" && find . -name "tests*.py"); do
-        start_servers
-        rm -f "$systest/$test.status"
-        test_status=0
-        (cd "$systest" && "$PYTEST" -v "$test" "$@" || echo "$?" > "$test.status") | SYSTESTDIR="$systest" cat_d
-        if [ -f "$systest/$test.status" ]; then
-            echo_i "FAILED"
-            test_status=$(cat "$systest/$test.status")
-        fi
-        status=$((status+test_status))
-        stop_servers || status=1
-    done
-else
-    echoinfo "I:$systest:pytest not installed, skipping python tests"
+if [ $status -eq 0 ]; then
+    if [ -n "$PYTEST" ]; then
+        run=$((run+1))
+        for test in $(cd "${systest}" && find . -name "tests*.py"); do
+            if start_servers; then
+                rm -f "$systest/$test.status"
+                test_status=0
+                (cd "$systest" && "$PYTEST" -v "$test" "$@" || echo "$?" > "$test.status") | SYSTESTDIR="$systest" cat_d
+                if [ -f "$systest/$test.status" ]; then
+                    echo_i "FAILED"
+                    test_status=$(cat "$systest/$test.status")
+                fi
+                status=$((status+test_status))
+                stop_servers || status=1
+            else
+                status=1
+                break
+            fi
+        done
+    else
+        echoinfo "I:$systest:pytest not installed, skipping python tests"
+    fi
 fi
 
 if [ "$run" -eq "0" ]; then
@@ -291,9 +294,9 @@ fi
 print_outstanding_files() {
     if test -d ${srcdir}/../../../.git; then
         git status -su --ignored "${systest}/" 2>/dev/null | \
-        sed -n -e 's|^?? \(.*\)|I:'${systest}':file \1 not removed|p' \
-            -e 's|^!! \(.*/named.run\)$|I:'${systest}':file \1 not removed|p' \
-            -e 's|^!! \(.*/named.memstats\)$|I:'${systest}':file \1 not removed|p'
+        sed -n -e 's|^?? \(.*\)|I:'"${systest}"':file \1 not removed|p' \
+            -e 's|^!! \(.*/named.run\)$|I:'"${systest}"':file \1 not removed|p' \
+            -e 's|^!! \(.*/named.memstats\)$|I:'"${systest}"':file \1 not removed|p'
     fi
 }