Add test-in-container infrastructure.

* Makefile (testroot.pristine): New rules to initialize the
test-in-container "testroot".
* Makerules (all-testsuite): Add tests-container.
* Rules (tests-expected): Add tests-container.
(binaries-all-tests): Likewise.
(tests-container): New, run these tests in the testroot container.
* support/Makefile (others): Add *-container, support_paths.c,
xmkdirp, and links-dso-program.
* support/links-dso-program-c.c: New.
* support/links-dso-program.cc: New.
* support/test-container.c: New.
* support/shell-container.c: New.
* support/echo-container.c: New.
* support/true-container.c: New.
* support/xmkdirp.c: New.
* support/xsymlink.c: New.
* support/support_paths.c: New.
* support/support.h: Add support paths prototypes.
* support/xunistd.h: Add xmkdirp () and xsymlink ().

* nss/tst-nss-test3.c: Convert to test-in-container.
* nss/tst-nss-test3.root/: New.

1 files changed, 66 insertions, 0 deletions

diff --git a/support/xmkdirp.c b/support/xmkdirp.c
new file mode 100644
index 0000000000..fada0452ea
--- /dev/null
+++ b/support/xmkdirp.c
@@ -0,0 +1,66 @@
+/* Error-checking replacement for "mkdir -p".
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <support/support.h>
+#include <support/check.h>
+#include <support/xunistd.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+/* Equivalent of "mkdir -p".  Any failures cause FAIL_EXIT1 so no
+   return code is needed.  */
+
+void
+xmkdirp (const char *path, mode_t mode)
+{
+  struct stat s;
+  const char *slash_p;
+  int rv;
+
+  if (path[0] == 0)
+    return;
+
+  if (stat (path, &s) == 0)
+    {
+      if (S_ISDIR (s.st_mode))
+	return;
+      errno = EEXIST;
+      FAIL_EXIT1 ("mkdir_p (\"%s\", 0%o): %m", path, mode);
+    }
+
+  slash_p = strrchr (path, '/');
+  if (slash_p != NULL)
+    {
+      while (slash_p > path && slash_p[-1] == '/')
+	--slash_p;
+      if (slash_p > path)
+	{
+	  char *parent = xstrndup (path, slash_p - path);
+	  xmkdirp (parent, mode);
+	  free (parent);
+	}
+    }
+
+  rv = mkdir (path, mode);
+  if (rv != 0)
+    FAIL_EXIT1 ("mkdir_p (\"%s\", 0%o): %m", path, mode);
+
+  return;
+}