New rootless container subsystems rely on the "user namespaces"
Linux feature. In order to create a container from a regular user the
user uid and subuids mapped to the uid space inside of container.
There are different default configurations used for different
container subsystems:
1. Rootless Docker[1] maps the user ID to 0, the subuids to range
starting from 1.
2. Rootless RunC[2] from OCI by default maps the user ID to 0 and
ignores the subuids.
3. LXC[3] maps the subuids to range from 0. UID not participates
in the mapping.
The LXC variant does not allow to work on same files simultaneusly
inside and outside of a container. Variant suggested by other
container susbsystems assumes that files owned by user should be
owned by root in a container environment.
In order to simplify Yocto compilation in such rootless containers I
want to allow to start the bitbake from root user in user namespace
and allow software compilation from root user in the described
configuration. Additionally I want to provide minimal dockerfile
suitable for the core-image-sato image compilation.
--
[1] https://docs.docker.com/engine/security/rootless/
[2] https://github.com/opencontainers/runc#rootless-containers
[3]
https://linuxcontainers.org/lxc/getting-started/#creating-unprivileged-containers-as-a-user
---
meta/classes/insane.bbclass | 4 ++--
meta/classes/sanity.bbclass | 10 +++++++-
meta/recipes-core/coreutils/coreutils_8.31.bb | 1 +
scripts/docker/Dockerfile | 19 +++++++++++++++
scripts/docker/oe-rootless-docker | 24 +++++++++++++++++++
5 files changed, 55 insertions(+), 3 deletions(-)
create mode 100644 scripts/docker/Dockerfile
create mode 100755 scripts/docker/oe-rootless-docker
diff --git a/meta/classes/insane.bbclass b/meta/classes/insane.bbclass
index 0564f9c2a4..3599ce3e6a 100644
--- a/meta/classes/insane.bbclass
+++ b/meta/classes/insane.bbclass
@@ -876,12 +876,12 @@ def package_qa_check_host_user(path, name, d, elf,
messages):
raise
else:
check_uid = int(d.getVar('HOST_USER_UID'))
- if stat.st_uid == check_uid:
+ if check_uid != 0 and stat.st_uid == check_uid:
package_qa_add_message(messages, "host-user-contaminated", "%s: %s
is owned by uid %d, which is the same as the user running bitbake. This may be
due to host contamination" % (pn, package_qa_clean_path(path, d, name),
check_uid))
return False
check_gid = int(d.getVar('HOST_USER_GID'))
- if stat.st_gid == check_gid:
+ if check_gid != 0 and stat.st_gid == check_gid:
package_qa_add_message(messages, "host-user-contaminated", "%s: %s
is owned by gid %d, which is the same as the user running bitbake. This may be
due to host contamination" % (pn, package_qa_clean_path(path, d, name),
check_gid))
return False
return True
diff --git a/meta/classes/sanity.bbclass b/meta/classes/sanity.bbclass
index 63ab6cf3df..a1eba62589 100644
--- a/meta/classes/sanity.bbclass
+++ b/meta/classes/sanity.bbclass
@@ -742,7 +742,15 @@ def check_sanity_everybuild(status, d):
# it makes sense to always run them.
if 0 == os.getuid():
- raise_sanity_error("Do not use Bitbake as root.", d)
+ userns = False
+ with open("/proc/self/uid_map") as f:
+ for line in f:
+ fields = line.split()
+ if fields[0] == "0" and fields[1] != "0":
+ userns = True
+ break
+ if not userns:
+ raise_sanity_error("Do not use Bitbake as root.", d)
# Check the Python version, we now have a minimum of Python 3.4
import sys
diff --git a/meta/recipes-core/coreutils/coreutils_8.31.bb
b/meta/recipes-core/coreutils/coreutils_8.31.bb
index 57b2c1bdba..2f8009331a 100644
--- a/meta/recipes-core/coreutils/coreutils_8.31.bb
+++ b/meta/recipes-core/coreutils/coreutils_8.31.bb
@@ -28,6 +28,7 @@ SRC_URI[sha256sum] =
"ff7a9c918edce6b4f4b2725e3f9b37b0c4d193531cac49a48b56c4d0d3
EXTRA_OECONF_class-native = "--without-gmp"
EXTRA_OECONF_class-target = "--enable-install-program=arch,hostname
--libexecdir=${libdir}"
EXTRA_OECONF_class-nativesdk = "--enable-install-program=arch,hostname"
+EXTRA_OECONF_append = " FORCE_UNSAFE_CONFIGURE=1"
# acl and xattr are not default features
#
diff --git a/scripts/docker/Dockerfile b/scripts/docker/Dockerfile
new file mode 100644
index 0000000000..4a143d6aa1
--- /dev/null
+++ b/scripts/docker/Dockerfile
@@ -0,0 +1,19 @@
+FROM ubuntu:18.04
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get -y update --fix-missing
+
+# Configure locale for Python3
+RUN DEBIAN_FRONTEND=noninteractive apt-get -y install locales ; \
+ DEBIAN_FRONTEND=noninteractive dpkg-reconfigure locales && \
+ locale-gen en_US.UTF-8 && \
+ update-locale LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8
+
+ENV LANG=en_US.UTF-8
+ENV LC_ALL=en_US.UTF-8
+
+# Install Yocto native dependencies
+RUN DEBIAN_FRONTEND=noninteractive apt-get -y install \
+ wget git-core diffstat unzip texinfo gcc-multilib \
+ build-essential chrpath socat cpio python python3 python3-pip
python3-pexpect \
+ xz-utils debianutils iputils-ping python3-git python3-jinja2
libegl1-mesa libsdl1.2-dev \
+ pylint3 xterm gawk
diff --git a/scripts/docker/oe-rootless-docker
b/scripts/docker/oe-rootless-docker
new file mode 100755
index 0000000000..1efcc82280
--- /dev/null
+++ b/scripts/docker/oe-rootless-docker
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+usage () {
+CMD=$(basename $0)
+cat <<EOF
+Usage: $CMD [docker-build|docker-run]
+ docker-build Build Dockerfile locally
+ docker-run Run rootless docker image suitable for image compilation
+EOF
+}
+
+if ! [ -n "${DOCKER_HOST}" -a "$(stat -c '%U' "${DOCKER_HOST#*://}"
2>/dev/null)" = "$(whoami)" ] ; then
+ echo "Install rootless docker according to the
https://docs.docker.com/engine/security/rootless/";
+ exit 1
+fi
+
+if [ "$1" = "docker-build" ]; then
+ docker build -t poky-docker $(dirname $(readlink -f $0))
+elif [ "$1" = "docker-run" ]; then
+ docker run -ti -v ${HOME}:${HOME} -v ${PWD}:${PWD} --workdir ${PWD} -e
HOME poky-docker
+else
+ usage
+ exit 0
+fi
--
2.17.1
--
_______________________________________________
Openembedded-core mailing list
Openembedded-core@lists.openembedded.org
http://lists.openembedded.org/mailman/listinfo/openembedded-core
