Remove 'grp' and merge into 'nss' and 'posix'

The majority of grp routines are entry points for nss functionality.
This commit removes the 'grp' subdirectory and moves all nss-relevant
functionality and all tests to 'nss', and the 'setgroups' stub into
'posix' (alongside the 'getgroups' stub).  References to grp/ are
accordingly changed.  In addition, compat-initgroups.c, a fallback
implementation of initgroups is renamed to initgroups-fallback.c so that
the build system does not confuse it for nss_compat/compat-initgroups.c.

Build time improves very slightly; e.g. down from an average of 45.5s to
44.5s on an 8-thread mobile x86_64 CPU.
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/nss/testgrp.c b/nss/testgrp.c
new file mode 100644
index 0000000000..892cfaaa21
--- /dev/null
+++ b/nss/testgrp.c
@@ -0,0 +1,41 @@
+#include <grp.h>
+#include <pwd.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+int
+main (int argc, char *argv[])
+{
+  uid_t me;
+  struct passwd *my_passwd;
+  struct group *my_group = NULL;
+  char **members;
+
+  me = getuid ();
+  my_passwd = getpwuid (me);
+  if (my_passwd == NULL)
+    printf ("Cannot find user entry for UID %d\n", me);
+  else
+    {
+      printf ("My login name is %s.\n", my_passwd->pw_name);
+      printf ("My uid is %d.\n", (int)(my_passwd->pw_uid));
+      printf ("My home directory is %s.\n", my_passwd->pw_dir);
+      printf ("My default shell is %s.\n", my_passwd->pw_shell);
+
+      my_group = getgrgid (my_passwd->pw_gid);
+      if (my_group == NULL)
+	printf ("No data for group %d found\n", my_passwd->pw_gid);
+      else
+	{
+	  printf ("My default group is %s (%d).\n",
+		  my_group->gr_name, (int)(my_passwd->pw_gid));
+	  printf ("The members of this group are:\n");
+	  for (members = my_group->gr_mem; *members != NULL; ++members)
+	    printf ("  %s\n", *members);
+	}
+    }
+
+  return my_passwd && my_group ? EXIT_SUCCESS : EXIT_FAILURE;
+}