tests: add library for LD_PRELOAD to manipulate with time() in tests

The cal command generates output that depends on time(). For reliable
regression tests we need to use still same time. It seems that LD_PRELOAD is
pretty simple way.

Signed-off-by: Karel Zak <kzak@redhat.com>

2 files changed, 33 insertions, 1 deletions

diff --git a/tests/helpers/Makefile.am b/tests/helpers/Makefile.am
index 13eaae1e9..6c514e7c7 100644
--- a/tests/helpers/Makefile.am
+++ b/tests/helpers/Makefile.am
@@ -1,5 +1,11 @@
 include $(top_srcdir)/config/include-Makefile.am
 
 noinst_PROGRAMS = mnt_test_sysinfo
+mnt_test_sysinfo_SOURCES = mnt_test_sysinfo.c
+
+
+noinst_LTLIBRARIES = libpreload-time.la
+
+libpreload_time_la_SOURCES = libpreload-time.c
+libpreload_time_la_LDFLAGS = -shared -rpath `pwd`  -avoid-version
 
-mnt_test_sysinfo_SOURCES = mnt_test_sysinfo.c 
diff --git a/tests/helpers/libpreload-time.c b/tests/helpers/libpreload-time.c
new file mode 100644
index 000000000..e69795098
--- /dev/null
+++ b/tests/helpers/libpreload-time.c
@@ -0,0 +1,26 @@
+
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <time.h>
+#include <sys/time.h>
+
+time_t
+time(time_t *t)
+{
+	time_t tt = 0;
+	char *e = getenv("TEST_TIME");
+
+	if (e && isdigit((unsigned char) *e))
+		tt = atol(e);
+	else {
+		struct timeval tv;
+
+		if (gettimeofday(&tv, NULL) == 0)
+			tt = tv.tv_sec;
+	}
+	if (t)
+		*t = tt;
+
+	return tt;
+}