Extract common parts of quiet wrapper
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/tests/scripts/quiet/quiet b/tests/scripts/quiet/quiet
new file mode 100755
index 0000000..2279e6a
--- /dev/null
+++ b/tests/scripts/quiet/quiet
@@ -0,0 +1,65 @@
+#! /usr/bin/env bash
+#
+# Copyright The Mbed TLS Contributors
+# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+#
+# This swallows the output of the wrapped tool, unless there is an error.
+# This helps reduce excess logging in the CI.
+
+# If you are debugging a build / CI issue, you can get complete unsilenced logs
+# by un-commenting the following line (or setting VERBOSE_LOGS in your environment):
+# VERBOSE_LOGS=1
+
+# Locate original tool
+ORIGINAL_TOOL=$(type -ap "${TOOL}" | grep -v -Fx "$0" | head -n1)
+
+print_quoted_args() {
+ # similar to printf '%q' "$@"
+ # but produce more human-readable results for common/simple cases like "a b"
+ for a in "$@"; do
+ simple_pattern='^([[:alnum:]_+-]+=)?([[:alnum:] _=+-./:@]*)$'
+ if [[ $a =~ ' ' && $a =~ $simple_pattern ]]; then
+ # a has spaces, but no other special characters that need escaping
+ # (quoting after removing spaces yields no backslashes)
+ # simplify quoted form - e.g.:
+ # a b -> "a b"
+ # CFLAGS=a b -> CFLAGS="a b"
+ q="${BASH_REMATCH[1]}\"${BASH_REMATCH[2]}\""
+ else
+ # get bash to do the quoting (which may result in no quotes or escaping,
+ # if none is needed).
+ q=$(printf '%q' "$a")
+ fi
+ printf "%s " "$q"
+ done
+}
+
+if [[ ! " $* " =~ " --version " ]]; then
+ # Display the command being invoked - if it succeeds, this is all that will
+ # be displayed. Don't do this for invocations with --version, because
+ # this output is often parsed by scripts, so we don't want to modify it.
+ printf %s "${TOOL} "
+ print_quoted_args "$@"
+ echo
+fi
+
+if [[ " $@ " =~ $NO_SILENCE || -n "${VERBOSE_LOGS}" ]]; then
+ # Run original command with no output supression
+ exec "${ORIGINAL_TOOL}" "$@"
+else
+ # Run original command and capture output & exit status
+ TMPFILE=$(mktemp "quiet-${TOOL}.XXXXXX")
+ "${ORIGINAL_TOOL}" "$@" > "${TMPFILE}" 2>&1
+ EXIT_STATUS=$?
+
+ if [[ $EXIT_STATUS -ne 0 ]]; then
+ # On error, display the full output
+ cat "${TMPFILE}"
+ fi
+
+ # Remove tmpfile
+ rm "${TMPFILE}"
+
+ # Propagate the exit status
+ exit $EXIT_STATUS
+fi