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This reverts commit 531514e8231e7f42efb7e7992d62e516f9577363.
Closes: https://github.com/containers/libpod/issues/2926
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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simplify the rootless implementation to use a single user namespace
for all the running containers.
This makes the rootless implementation behave more like root Podman,
where each container is created in the host environment.
There are multiple advantages to it: 1) much simpler implementation as
there is only one namespace to join. 2) we can join namespaces owned
by different containers. 3) commands like ps won't be limited to what
container they can access as previously we either had access to the
storage from a new namespace or access to /proc when running from the
host. 4) rootless varlink works. 5) there are only two ways to enter
in a namespace, either by creating a new one if no containers are
running or joining the existing one from any container.
Containers created by older Podman versions must be restarted.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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from _LIBPOD to _CONTAINERS. The same change was done in buildah
unshare.
This is necessary for podman to detect we are running in a rootless
environment and work properly from a "buildah unshare" session.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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we use "podman info" to reconfigure the runtime after a reboot, but we
don't propagate the error message back if something goes wrong.
Closes: https://github.com/containers/libpod/issues/2584
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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from the clone man page:
On the cris and s390 architectures, the order of the first two
arguments is reversed:
long clone(void *child_stack, unsigned long flags,
int *ptid, int *ctid,
unsigned long newtls);
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1672714
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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when joining an existing namespace, we were not maintaining the
current working directory, causing commands like export -o to fail
when they weren't referring to absolute paths.
Closes: https://github.com/containers/libpod/issues/2381
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Because the varlink server honors the socket activation protocol,
LISTEN_PID has to be adjusted with the new PID.
https://varlink.org/FAQ.html#how-does-socket-activation-work
Signed-off-by: Harald Hoyer <harald@redhat.com>
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If realloc fails, then buffer will be leaked, this change frees up the buffer.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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Add the possibility to join directly the user and mount namespace
without looking up the parent of the user namespace.
We need this in order to be able the conmon process, as the mount
namespace is kept alive only there.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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the issue is caused by the Go Runtime that messes up with the process
signals, overriding SIGSETXID and SIGCANCEL which are used internally
by glibc. They are used to inform all the threads to update their
stored uid/gid information. This causes a hang on the set*id glibc
wrappers since the handler installed by glibc is never invoked.
Since we are running with only one thread, we don't really need to
update other threads or even the current thread as we are not using
getuid/getgid before the execvp.
Closes: https://github.com/containers/libpod/issues/1625
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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change the tests to use chroot to set a numeric UID/GID.
Go syscall.Credential doesn't change the effective UID/GID of the
process.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #1372
Approved by: mheon
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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #1371
Approved by: rhatdan
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Closes: #1206
Approved by: giuseppe
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Closes: https://github.com/projectatomic/libpod/issues/1189
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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rootless: unshare mount namespace
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unshare the mount namespace as well when creating an user namespace so
that we are the owner of the mount namespace and we can mount FUSE
file systems on Linux 4.18. Tested on Fedora Rawhide:
podman --storage-opt overlay.fuse_program=/usr/bin/fuse-overlayfs run alpine echo hello
hello
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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use execvp instead of exec so that we keep the PATH environment
variable and the lookup for the "podman" executable works.
Closes: https://github.com/projectatomic/libpod/issues/1070
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #1072
Approved by: mheon
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After we re-exec in the userNS os.Getuid() returns the new UID (= 0)
which is not what we want to use.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #1048
Approved by: mheon
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Additional groups are not allowed in an userNS.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #936
Approved by: rhatdan
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When running podman as non root user always create an userNS and let
the OCI runtime use it.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #936
Approved by: rhatdan
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