tests/init.sh: add helpers for running set of programs

This introduces three new helpers:
prog_set_subtract subtracts one program set from another,
test_pure_prog_set runs strace check on a set of programs,
test_trace_expr tests trace expressions.

* tests/init.sh (prog_set_subtract, test_pure_prog_set,
test_trace_expr): New functions.

diff --git a/tests/init.sh b/tests/init.sh
index 20d095f3bd85c5c5e7bfbaa166cfb6acca4f59f2..0d82dd39ef5433e5145eabe3d690806d86d171a3 100644 (file)
--- a/tests/init.sh
+++ b/tests/init.sh
@@ -262,6 +262,75 @@ grep_pid_status()
        cat < "/proc/$pid/status" | grep "$@"
 }
 
+# Subtracts one program set from another.
+# If an optional regular expression is specified, the lines in the minuend file
+# that match this regular expression are elso excluded from the output.
+#
+# Usage: prog_set_subtract minuend_file subtrahend_file [subtrahend_regexp]
+prog_set_subtract()
+{
+       local min sub re pat
+       min="$1"; shift
+       sub="$1"; shift
+       re="${1-}"
+       pat="$re|$(sed 's/[[:space:]].*//' < "$sub" | tr -s '\n' '|')"
+       grep -E -v -x -e "$pat" < "$min"
+}
+
+# Usage: test_pure_prog_set [--expfile FILE] COMMON_ARGS < tests_file
+# stdin should consist of lines in "test_name strace_args..." format.
+test_pure_prog_set()
+{
+       local expfile
+
+       expfile="$EXP"
+
+       while [ -n "$1" ]; do
+               case "$1" in
+               --expfile)
+                       shift
+                       expfile="$1"
+                       shift
+                       ;;
+               *)
+                       break
+                       ;;
+               esac
+       done
+
+       while read -r t prog_args; do {
+               # skip lines beginning with "#" symbol
+               [ "${t###}" = "$t" ] || continue
+
+               try_run_prog "../$t" || continue
+               run_strace $prog_args "$@" "../$t" > "$expfile"
+               match_diff "$LOG" "$expfile"
+       } < /dev/null; done
+}
+
+# Run strace against list of programs put in "$NAME.in" and then against the
+# rest of pure_executables.list with the expectation of empty output in the
+# latter case.
+#
+# Usage: source this file after init.sh and call:
+#   test_trace_expr subtrahend_regexp strace_args
+# Environment:
+#   $NAME:     test name, used for "$NAME.in" file containing list of tests
+#              for positive trace expression match;
+#   $srcdir:   used to find pure_executables.list and "$NAME.in" files.
+# Files created:
+#   negative.list: File containing list of tests for negative match.
+test_trace_expr()
+{
+       local subtrahend_regexp
+       subtrahend_regexp="$1"; shift
+       test_pure_prog_set "$@" < "$srcdir/$NAME.in"
+       prog_set_subtract "$srcdir/pure_executables.list" "$srcdir/$NAME.in" \
+               "$subtrahend_regexp" > negative.list
+       test_pure_prog_set --expfile /dev/null -qq -esignal=none "$@" \
+               < negative.list
+}
+
 check_prog cat
 check_prog rm