Add a --quiet option to all.sh

The primary purpose is to use it to run all.sh -k -q in the pre-push hook, but
this can be useful in any circumstance where you're not interested in the full
output from each component and just want a short summary of which components
were run (and if any failed).

Note that only stdout from components is suppressed, stderr is preserved so
that errors are reported. This means components should avoid printing to
stderr in normal usage (ie in the absence of errors).

Currently all the `check_*` components obey this convention except:
- check_generate_test_code: unittest prints progress to stderr
- check_test_cases: lots of non-fatal warnings printed to stderr

These components will be fixed in follow-up commits.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

tests/scripts/all.sh

@@ -158,6 +158,7 @@ pre_initialize_variables () {
 
     MEMORY=0
     FORCE=0
+    QUIET=0
     KEEP_GOING=0
 
     # Seed value used with the --release-test option.
@@ -238,6 +239,7 @@ Special options:
   --list-components     List components supported on this platform and exit.
 
 General options:
+  -q|--quiet            Only output component names, and errors if any.
   -f|--force            Force the tests to overwrite any modified files.
   -k|--keep-going       Run all tests and report errors at the end.
   -m|--memory           Additional optional memory tests.
@@ -251,6 +253,7 @@ General options:
      --no-force         Refuse to overwrite modified files (default).
      --no-keep-going    Stop at the first error (default).
      --no-memory        No additional memory tests (default).
+     --no-quiet         Print full ouput from components.
      --out-of-source-dir=<path>  Directory used for CMake out-of-source build tests.
      --random-seed      Use a random seed value for randomized tests (default).
   -r|--release-test     Run this script in release mode. This fixes the seed value to ${RELEASE_SEED}.
@@ -317,6 +320,11 @@ msg()
     else
         current_section="$1"
     fi
+
+    if [ $QUIET -eq 1 ]; then
+        return
+    fi
+
     echo ""
     echo "******************************************************************"
     echo "* $current_section "
@@ -387,10 +395,12 @@ pre_parse_command_line () {
             --no-force) FORCE=0;;
             --no-keep-going) KEEP_GOING=0;;
             --no-memory) MEMORY=0;;
+            --no-quiet) QUIET=0;;
             --openssl) shift; OPENSSL="$1";;
             --openssl-legacy) shift; OPENSSL_LEGACY="$1";;
             --openssl-next) shift; OPENSSL_NEXT="$1";;
             --out-of-source-dir) shift; OUT_OF_SOURCE_DIR="$1";;
+            --quiet|-q) QUIET=1;;
             --random-seed) unset SEED;;
             --release-test|-r) SEED=$RELEASE_SEED;;
             --seed|-s) shift; SEED="$1";;
@@ -472,7 +482,7 @@ pre_setup_keep_going () {
             failure_summary="$failure_summary
 $text"
             failure_count=$((failure_count + 1))
-            echo "${start_red}^^^^$text^^^^${end_color}"
+            echo "${start_red}^^^^$text^^^^${end_color}" >&2
         fi
     }
     make () {
@@ -518,7 +528,23 @@ not() {
     ! "$@"
 }
 
+pre_setup_quiet_redirect () {
+    if [ $QUIET -ne 1 ]; then
+        redirect_out () {
+            "$@"
+        }
+    else
+        redirect_out () {
+            "$@" >/dev/null
+        }
+    fi
+}
+
 pre_print_configuration () {
+    if [ $QUIET -eq 1 ]; then
+        return
+    fi
+
     msg "info: $0 configuration"
     echo "MEMORY: $MEMORY"
     echo "FORCE: $FORCE"
@@ -591,6 +617,11 @@ pre_check_tools () {
                         "$ARMC6_CC" "$ARMC6_AR" "$ARMC6_FROMELF";;
     esac
 
+    # past this point, no call to check_tool, only printing output
+    if [ $QUIET -eq 1 ]; then
+        return
+    fi
+
     msg "info: output_env.sh"
     case $RUN_COMPONENTS in
         *_armcc*)
@@ -1580,8 +1611,17 @@ run_component () {
     # The cleanup function will restore it.
     cp -p "$CONFIG_H" "$CONFIG_BAK"
     current_component="$1"
-    "$@"
+
+    # Run the component code.
+    if [ $QUIET -eq 1 ]; then
+        # msg() is silenced, so just print the component name here
+        echo "${current_component#component_}"
+    fi
+    redirect_out "$@"
+
+    # Restore the build tree to a clean state.
     cleanup
+    current_component=""
 }
 
 # Preliminary setup
@@ -1598,6 +1638,7 @@ else
         "$@"
     }
 fi
+pre_setup_quiet_redirect
 pre_print_configuration
 pre_check_tools
 cleanup