Fix/improve output on errors

kerl

@@ -196,7 +196,7 @@ autoclean() {
         tmplf="$(mktemp "$TMP_DIR"/kerl.XXXXXX)"
         test -f "$BUILD_LOGFILE" && cp -f "$BUILD_LOGFILE" "$tmplf"
         # Cleaning current build
-        cd - 1>/dev/null 2>&1 || return 1
+        cd - 1>/dev/null 2>&1 || return 0
         test -n "$1" && ${_KERL_SCRIPT} cleanup "$1"
         # Copy BUILD_LOGFILE back to keep track of all attempts until success
         mkdir -p "$(dirname "$BUILD_LOGFILE")"
@@ -1664,9 +1664,7 @@ do_install() {
 
     [ -n "$KERL_RELEASE_TARGET" ] && [ -f bin/cerl ] && cp bin/cerl "$absdir/bin"
 
-    if ! list_add installations "$build_name $absdir"; then
-        exit_install
-    fi
+    list_add installations "$build_name $absdir"
 
     emit_activate "$rel" "$build_name" "$absdir" >"$absdir"/activate
     emit_activate_fish "$rel" "$build_name" "$absdir" >"$absdir"/activate.fish
@@ -1789,7 +1787,7 @@ do_plt() {
         fi
     else
         error "no Erlang/OTP installation is currently active"
-        return 2
+        return 1
     fi
 }
 
@@ -1798,10 +1796,8 @@ print_buildopts() {
     if [ -f "$buildopts" ]; then
         notice "The build options for the active installation are:"
         cat "$buildopts"
-        return 0
     else
         error "the build options for the active installation are not available."
-        return 1
     fi
 }
 
@@ -2052,9 +2048,9 @@ list_add() {
                 return 0
             fi
         done <"$KERL_BASE_DIR/otp_$1"
-        echo "$2" >>"$KERL_BASE_DIR/otp_$1" || return 1
+        echo "$2" >>"$KERL_BASE_DIR/otp_$1"
     else
-        echo "$2" >"$KERL_BASE_DIR/otp_$1" || return 1
+        echo "$2" >"$KERL_BASE_DIR/otp_$1"
     fi
 }
 
@@ -2374,14 +2370,15 @@ path)
                     match="$ins"
                 else
                     error "too many matching installations."
-                    exit 2
+                    exit 1
                 fi
             fi
         done
         if [ -n "$match" ]; then
             echo "$match"
         else
-            error "no matching installation found." && exit 1
+            error "no matching installation found."
+            exit 1
         fi
     fi
     ;;