Fix atf-sh's integration_test

With the move of atf-sh into /usr/libexec in r267181, some of the
tests in the integration_test program broke because they could not
execute atf-sh from the path any longer.

This slipped through because I do have a local atf installation in
my home directory that appears in my path, hence the tests could
still execute my own version.

Fix this by forcing /usr/libexec to appear at the beginning of the
path when attempting to execute atf-sh.

To make upgrading easy (and to avoid an unnecessary entry in UPDATING),
make integration_test depend on the Makefile so that a rebuild of the
shell script is triggered.  This requires a hack in the *.test.mk files
to ensure the Makefile is not treated as a source to the generated
program.  Ugly, I know, but I don't have a better way of doing this at
the moment.  Will think of one once I address the TODO in the *.test.mk
files that suggests generalizing the file generation functionality.

PR:		191052
Reviewed by:	Garrett Cooper

1 files changed, 2 insertions, 1 deletions

diff --git a/share/mk/plain.test.mk b/share/mk/plain.test.mk
index 99685ef1d966..f26bab3e42ef 100644
--- a/share/mk/plain.test.mk
+++ b/share/mk/plain.test.mk
@@ -57,7 +57,8 @@ CLEANFILES+= ${_T} ${_T}.tmp
 PLAIN_TESTS_SH_SED_${_T}?= # empty
 PLAIN_TESTS_SH_SRC_${_T}?= ${_T}.sh
 ${_T}: ${PLAIN_TESTS_SH_SRC_${_T}}
-	cat ${.ALLSRC} | sed ${PLAIN_TESTS_SH_SED_${_T}} >${.TARGET}.tmp
+	cat ${.ALLSRC:N*Makefile*} \
+	    | sed ${PLAIN_TESTS_SH_SED_${_T}} >${.TARGET}.tmp
 	chmod +x ${.TARGET}.tmp
 	mv ${.TARGET}.tmp ${.TARGET}
 .endfor