From 15352decf8fd834627d05fb619dd523f50101977 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Alex=20Benn=C3=A9e?= Date: Tue, 17 Jul 2018 17:11:26 +0100 Subject: [PATCH] docker: perform basic binfmt_misc validation in docker.py MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Setting up binfmt_misc is outside of the scope of the docker.py script but we can at least validate it with any given executable so we have a more useful error message than the sed line of deboostrap failing cryptically. Signed-off-by: Alex Bennée Reported-by: Richard Henderson --- tests/docker/docker.py | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/tests/docker/docker.py b/tests/docker/docker.py index 2f81c6b13b..d3006d4dae 100755 --- a/tests/docker/docker.py +++ b/tests/docker/docker.py @@ -112,6 +112,31 @@ def _copy_binary_with_libs(src, dest_dir): so_path = os.path.dirname(l) _copy_with_mkdir(l , dest_dir, so_path) + +def _check_binfmt_misc(executable): + """Check binfmt_misc has entry for executable in the right place. + + The details of setting up binfmt_misc are outside the scope of + this script but we should at least fail early with a useful + message if it won't work.""" + + binary = os.path.basename(executable) + binfmt_entry = "/proc/sys/fs/binfmt_misc/%s" % (binary) + + if not os.path.exists(binfmt_entry): + print ("No binfmt_misc entry for %s" % (binary)) + return False + + with open(binfmt_entry) as x: entry = x.read() + + qpath = "/usr/bin/%s" % (binary) + if not re.search("interpreter %s\n" % (qpath), entry): + print ("binfmt_misc for %s does not point to %s" % (binary, qpath)) + return False + + return True + + def _read_qemu_dockerfile(img_name): # special case for Debian linux-user images if img_name.startswith("debian") and img_name.endswith("user"): @@ -315,6 +340,11 @@ class BuildCommand(SubCommand): # Create a docker context directory for the build docker_dir = tempfile.mkdtemp(prefix="docker_build") + # Validate binfmt_misc will work + if args.include_executable: + if not _check_binfmt_misc(args.include_executable): + return 1 + # Is there a .pre file to run in the build context? docker_pre = os.path.splitext(args.dockerfile)[0]+".pre" if os.path.exists(docker_pre): -- 2.11.0