[master] d208f376e vtest: make the basename of the test directory available as vtcid

[Nils Goroll]

commit d208f376e6c706a962686a20413b814efccd24d0
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Fri Jun 23 12:41:01 2023 +0200

    vtest: make the basename of the test directory available as vtcid
    
    to have available a unique string for concurrently running tests
    which is not a path.

diff --git a/bin/varnishtest/vtc.c b/bin/varnishtest/vtc.c
index 12647c6ee..55080ac27 100644
--- a/bin/varnishtest/vtc.c
+++ b/bin/varnishtest/vtc.c
@@ -600,6 +600,11 @@ exec_file(const char *fn, const char *script, const char *tmpdir,
 	/* Move into our tmpdir */
 	AZ(chdir(tmpdir));
 	macro_def(vltop, NULL, "tmpdir", "%s", tmpdir);
+	p = strrchr(tmpdir, '/');
+	AN(p);
+	p++;
+	AN(*p);
+	macro_def(vltop, NULL, "vtcid", "%s", p);
 
 	/* Drop file to tell what was going on here */
 	f = fopen("INFO", "w");