Refactoring, making error messages nicer, & lcov

Directory name for bro core coverage changed to "coverage", error
messages made nicer. Use `make html` in testing/coverage to create
logs in HTML format when lcov exists on the system.

.gitignore

@@ -1,2 +1,3 @@
 build
 tmp
+*.gcov

testing/Makefile

@@ -8,7 +8,7 @@ brief: make-brief coverage
 distclean:
 	@rm -f coverage.log
 	$(MAKE) -C btest $@
-	$(MAKE) -C bro-core-coverage $@
+	$(MAKE) -C coverage $@
 
 make-verbose:
 	@for repo in $(DIRS); do (cd $$repo && make -s ); done
@@ -23,5 +23,5 @@ coverage:
 	@echo "Complete test suite code coverage:"
 	@./scripts/coverage-calc "brocov.tmp.*" coverage.log `pwd`/../scripts
 	@rm -f brocov.tmp.*
-	@cd bro-core-coverage && make coverage
+	@cd coverage && make coverage
 

testing/coverage/Makefile

@@ -7,3 +7,9 @@ cleanup:
 
 distclean: cleanup
 	@find ../../ -name "*.gcno" -exec rm {} \;
+
+html:
+	@(cd ../../; if which lcov; then\
+		lcov --capture --directory . --output-file coverage.info \
+		&& genhtml coverage.info && rm coverage.info; \
+	fi)

testing/coverage/README

@@ -0,0 +1,13 @@
+On a Bro build configured with --enable-coverage, this script produces a code coverage report after Bro has been invoked. The intended application of this script is after the btest testsuite has run. This combination (btests first, coverage computation afterward) happens automatically when running "make" in the testing directory.  This script puts .gcov files (which are included in .gitignore) alongside the corresponding source files.
+
+This depends on gcov, which should come with your gcc. If gcov is not installed, the script will abort with an error message.
+
+TODO: Use `make html` as make target in this directory to output the html files that gcov can create (must have lcov on system).
+
+The goal of code-coverage.sh script is to automate code coverage testing. See the following steps for the code structure:
+	1. Run test suite
+ 	2. Check for .gcda files existing.
+	3a. Run gcov (-p to preserve path)
+	3b. Prune .gcov files for objects outside of the Bro tree
+	4a. Analyze .gcov files generated and create summary file
+	4b. Send .gcov files to appropriate path

testing/coverage/code_coverage.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # On a Bro build configured with --enable-coverage, this script
 # produces a code coverage report after Bro has been invoked. The
@@ -17,7 +17,7 @@
 #	4b. Send .gcov files to appropriate path
 #
 CURR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" # Location of script
-BASE="$(realpath "${CURR}/../../")"
+BASE="$(readlink -f "${CURR}/../../")"
 TMP="${CURR}/tmp.$$"
 mkdir -p $TMP
 
@@ -96,14 +96,20 @@ done
 echo "ok"
 
 # 3a. Run gcov (-p to preserve path) and move into tmp directory
+# ... if system does not have gcov installed, exit with message.
 echo -n "Creating coverage files... "
-( cd "$TMP" && find "$BASE" -name "*.o" -exec gcov -p {} > /dev/null 2>&1 \; )
-NUM_GCOVS=$(ls "$TMP"/*.gcov | wc -l)
-if [ $NUM_GCOVS -eq 0 ]; then
+if which gcov; then
+	( cd "$TMP" && find "$BASE" -name "*.o" -exec gcov -p {} > /dev/null 2>&1 \; )
+	NUM_GCOVS=$(find "$TMP" -name *.gcov | wc -l)
+	if [ $NUM_GCOVS -eq 0 ]; then
 		echo "no gcov files produced, aborting"
 		exit 1
+	fi
+	echo "ok, $NUM_GCOVS coverage files"
+else
+	echo "gcov is not installed on system, aborting"
+	exit 1
 fi
-echo "ok, $NUM_GCOVS coverage files"
 
 # 3b. Prune gcov files that fall outside of the Bro tree:
 # Look for files containing gcov's slash substitution character "#"