Add generic support for running tests as root.

By setting `ASROOT=1` in a unit test makefile a test will now run as
root, using `sudo -n`.

This patch allows us to simplify the pidfilefn() test.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

pidfilefn.c

@@ -120,7 +120,11 @@ int pidfile_signal(const char *pidfile, int signal)
 
 /********************************* UNIT TESTS ************************************/
 #ifdef UNITTEST
-#define PIDFILE "/tmp/pidfilefn.test.pid"
+#include <paths.h>
+#include "lite.h"
+
+extern char *__progname;
+static char PIDFILE[42];
 
 static void sigterm_handler(int signo)
 {
@@ -131,10 +135,15 @@ static void sigalrm_handler(int signo)
 {
 	printf("Testing pidfile() ...\n");
 	pidfile(NULL);
+
+	if (!fexist(PIDFILE))
+		err(1, "pidfile() failed creating %s", PIDFILE);
 }
 
 int main(void)
 {
+	snprintf(PIDFILE, sizeof(PIDFILE), "%s%s.pid", _PATH_VARRUN, __progname);
+
 	signal(SIGTERM, sigterm_handler);
 	signal(SIGALRM, sigalrm_handler);
 	alarm(1);
@@ -145,8 +154,6 @@ int main(void)
 	else
 		printf("We got signal!\n");
 
-	system("ls -ld " PIDFILE);
-
 	printf("Reading pid file, should be %d ...\n", getpid());
         printf("=> %d\n", pidfile_read(PIDFILE));
 

pidfilefn.mk

@@ -1,5 +1,5 @@
-OBJS        = pidfile.o chomp.o
-TARGET      = $(OBJS) pidfilefn.test clean
-CPPFLAGS    = -D_PATHS_H_ -D_PATH_VARRUN="\"/tmp/\""
+OBJS        = pidfile.o chomp.o fexist.o
+ASROOT      = 1
+TARGET      = clean $(OBJS) pidfilefn.test
 
 include rules.mk

rules.mk

@@ -25,6 +25,13 @@ REDIRECT    = >/dev/null
 MAKEFLAGS   = --no-print-directory --silent
 endif
 
+# Some tests may need to be run as root, e.g. pidfile()
+ifeq ($(ASROOT), 1)
+SUDO        = sudo -n
+else
+SUDO        =
+endif
+
 # Default install paths
 prefix     ?= /usr/local
 libdir     ?= $(prefix)/lib
@@ -40,10 +47,11 @@ incdir     ?= $(prefix)/include
 	$(PRINT) "  LINK    $(subst $(ROOTDIR)/,,$(shell pwd)/)$@\n"
 	$(Q)$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-Map,$@.map -o $@ $^ $(LDLIBS$(LDLIBS-$(@)))
 
+.PHONY: %.test
 %.test: %.c
 	$(PRINT) "  TEST    $(subst $(ROOTDIR)/,,$(shell pwd)/)$(@:.test=)\n"
 	$(Q)$(CC) $(CFLAGS) $(CPPFLAGS) -g -o $@ -DUNITTEST $< $(OBJS)
-	$(Q)@./$@ $(REDIRECT)
+	$(Q)$(SUDO) ./$@ $(REDIRECT)
 
 
 # Default build rules for both main and unit test makefiles