From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42607) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ffWBX-0000cV-Sk for qemu-devel@nongnu.org; Tue, 17 Jul 2018 16:03:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ffWBS-0001gK-WD for qemu-devel@nongnu.org; Tue, 17 Jul 2018 16:02:59 -0400 Received: from mail-wr1-x42e.google.com ([2a00:1450:4864:20::42e]:39782) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1ffWBS-0001fn-On for qemu-devel@nongnu.org; Tue, 17 Jul 2018 16:02:54 -0400 Received: by mail-wr1-x42e.google.com with SMTP id h10-v6so2397349wre.6 for ; Tue, 17 Jul 2018 13:02:54 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= Date: Tue, 17 Jul 2018 20:55:52 +0100 Message-Id: <20180717195553.9111-18-alex.bennee@linaro.org> In-Reply-To: <20180717195553.9111-1-alex.bennee@linaro.org> References: <20180717195553.9111-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PATCH v3 for 3.0 17/18] docker: perform basic binfmt_misc validation in docker.py List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: cota@braap.org, famz@redhat.com, berrange@redhat.com, f4bug@amsat.org, richard.henderson@linaro.org, balrogg@gmail.com, aurelien@aurel32.net, agraf@suse.de Cc: qemu-devel@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= 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 523f4b95a2..a3f5b0c1b0 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): -- 2.17.1