runcon: ensure --compute runs the file it inspects

* src/runcon.c (main): With -c avoid searching the path
to ensure the file specified to --compute is executed.
* tests/misc/runcon-compute.sh: Add a new test.
* tests/local.mk: Reference the new test.
* NEWS: Mention the bug fix.
Reported in https://bugs.debian.org/1013924

2 files changed, 29 insertions, 0 deletions

diff --git a/tests/local.mk b/tests/local.mk
index 0f7778619..0496c2873 100644
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -351,6 +351,7 @@ all_tests =					\
   tests/misc/readlink-fp-loop.sh		\
   tests/misc/readlink-root.sh			\
   tests/misc/realpath.sh			\
+  tests/misc/runcon-compute.sh			\
   tests/misc/runcon-no-reorder.sh		\
   tests/misc/sha1sum.pl				\
   tests/misc/sha1sum-vec.pl			\
diff --git a/tests/misc/runcon-compute.sh b/tests/misc/runcon-compute.sh
new file mode 100755
index 000000000..1c4e0c060
--- /dev/null
+++ b/tests/misc/runcon-compute.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+# Ensure that runcon -c uses absolute file names
+
+# Copyright (C) 2022 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program 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 General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ runcon
+
+# Create an executable that's sure to fail
+printf '%s\n' '#!/bin/sh' 'exit 1' >> 'true' || framework_failure_
+chmod a+x 'true' || framework_failure_
+
+returns_ 1 runcon -c true || fail=1
+
+Exit $fail