Add our own little tool to call getgroups(2) because it's too hard to

find a portable shell command that does it.

Makefile.in

@@ -72,6 +72,9 @@ $(OBJS): config.h
 tls: $(TLS_OBJ)
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(TLS_OBJ) $(LIBS)
 
+getgroups: getgroups.o
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $< $(LIBS)
+
 Makefile: Makefile.in configure config.status
 	echo "WARNING: You need to run ./config.status --recheck"
 

getgroups.c

+/*
+ * Copyright (C) 2002 by Martin Pool
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/**
+ * @file getgroups.c
+ *
+ * Print out the gids of all groups for the current user.  This is
+ * like `id -G` on Linux, but it's too hard to find a portable
+ * equivalent.
+ **/
+
+#include "rsync.h"
+
+int main(int argc, char *argv[])
+{
+	int n, i;
+	gid_t list[NGROUPS];
+
+	if ((n = getgroups(NGROUPS, list)) == -1) {
+		perror("getgroups");
+		return 1;
+	}
+
+	for (i = 0; i < n; i++) 
+		printf("%u ", list[i]);
+	printf("\n");
+		
+	return 0;
+}