self tests: cater for /bin/ksh symlinked to Zsh

* t/self-check-reexec.tap: When searching for a suitable non-Bash
shells, be sure to reject any shell that is Zsh "in disguise" (as
can be found on some Debian systems, where /bin/ksh can be symlinked
to /bin/zsh4).  This is required because our testsuite does not
support older versions of Zsh, and that was causing the test to fail
in the setup just described.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --git a/t/self-check-reexec.tap b/t/self-check-reexec.tap
index 7b91008..e19a681 100755 (executable)
--- a/t/self-check-reexec.tap
+++ b/t/self-check-reexec.tap
@@ -48,7 +48,12 @@ for non_bash_shell in \
 do
   test "$non_bash_shell" = : && break
   $non_bash_shell -c 'exit 0' || continue
-  $non_bash_shell -c 'test -n "$BASH_VERSION"' && continue
+  # Be sure to reject also any shell that is Zsh "in disguise" (as can
+  # be found on some Debian systems, where /bin/ksh can be symlinked to
+  # /bin/zsh4).  This is required because our testsuite does not support
+  # older versions of Zsh, and that has caused spurious failures in the
+  # past.
+  $non_bash_shell -c 'test -n "$ZSH_VERSION$BASH_VERSION"' && continue
   break
 done