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, 4 insertions, 0 deletions

diff --git a/support/xunistd.h b/support/xunistd.h
index 5fe5dae818..cdd4e8d92d 100644
--- a/support/xunistd.h
+++ b/support/xunistd.h
@@ -43,6 +43,10 @@ void xunlink (const char *path);
 long xsysconf (int name);
 long long xlseek (int fd, long long offset, int whence);
 void xftruncate (int fd, long long length);
+void xsymlink (const char *target, const char *linkpath);
+
+/* Equivalent of "mkdir -p".  */
+void xmkdirp (const char *, mode_t);
 
 /* Read the link at PATH.  The caller should free the returned string
    with free.  */