lint: Fix shellcheck warnings, add comments

When the script was pulled out of the makefile, it was left as it was
written in the makefile to show the continuity with the original.  This
patch cleans up issues identified by shellcheck and adds comments.

Change-Id: I5e6573a4fdfbb397e15db38e2e3dfadeb3430573
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: http://review.coreboot.org/11931
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

1 files changed, 22 insertions, 15 deletions

diff --git a/util/lint/lint b/util/lint/lint
index fa47fb443e..e65ffaaefa 100755
--- a/util/lint/lint
+++ b/util/lint/lint
@@ -21,21 +21,25 @@ usage () {
 	printf "Usage: %s <lint|lint-stable> [--junit]\n" "$0"
 }
 
+#write to the junit xml file if --junit was specified
 junit_write () {
 	if [ "$JUNIT" -eq 1 ]; then
 		echo "$1" >> "$XMLFILE"
 	fi
 }
 
+#verify the first command line parameter
 if [ -z "$1" ] || [ "$1" != "lint" ] && [ "$1" != "lint-stable" ]; then
 	usage
 	exit 1
 fi
 
-LINTLOG=`mktemp .tmpconfig.lintXXXXX`;
-XMLFILE="$(dirname $0)/junit.xml"
+LINTLOG=$(mktemp .tmpconfig.lintXXXXX);
+XMLFILE="$(dirname "$0")/junit.xml"
 FAILED=0;
 
+#check optional second command line parameter.
+#TODO: Add real command line handling if anything more is added
 if [ "$2" = "--junit" ]; then
 	JUNIT=1
 	echo '<?xml version="1.0" encoding="utf-8"?>' > "$XMLFILE"
@@ -43,29 +47,32 @@ if [ "$2" = "--junit" ]; then
 else
 	JUNIT=0
 fi
-for script in util/lint/${1}-*; do
-	echo
-	echo "$(basename $script)"
-	grep "^# DESCR:" $script | sed "s,.*DESCR: *,,"
+
+#run all scripts of the requested type
+for script in "$(dirname "$0")/${1}-"*; do
+	printf "\n%s\n" "$(basename "$script")"
+	grep "^# DESCR:" "$script" | sed "s,.*DESCR: *,,"
 	echo "========"
-	junit_write "	<testcase classname='lint' name='$(basename $script)'>"
-	$script > $LINTLOG
-	if [ `cat $LINTLOG | wc -l` -eq 0 ]; then
+	junit_write "	<testcase classname='lint' name='$(basename "$script")'>"
+	$script > "$LINTLOG"
+
+	#if the lint script gives any output, that's a failure
+	if [ "$(wc -l < "$LINTLOG")" -eq 0 ]; then
 		echo "success"
 		junit_write "		<system-out><![CDATA[success]]></system-out>"
 	else
 		echo "test failed:"
-		cat $LINTLOG
+		cat "$LINTLOG"
 		junit_write "		<failure type='testFailed'><![CDATA["
-		junit_write "$(cat $LINTLOG)"
+		junit_write "$(cat "$LINTLOG")"
 		junit_write "]]></failure>"
-		rm -f $LINTLOG
-		FAILED=$(( $FAILED + 1 ))
+		rm -f "$LINTLOG"
+		FAILED=$(( FAILED + 1 ))
 	fi
 	echo "========"
 	junit_write '	</testcase>'
 done
 
-test $FAILED -eq 0 || { echo "ERROR: $FAILED test(s) failed."; rm -f $LINTLOG && exit 1; };
-rm -f $LINTLOG
+test $FAILED -eq 0 || { echo "ERROR: $FAILED test(s) failed."; rm -f "$LINTLOG" && exit 1; };
+rm -f "$LINTLOG"
 junit_write '</testsuite>'