Given these same exact functions are both now available in
opencontainers/runc (libcontainer/system) package, and we only use the
`SetSubreaper` today from the shim, there seems to be no reason for
duplication.
Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
Could issues where when exec processes fail the wait block is not
released.
Second, you could not dump stacks if the reaper loop locks up.
Third, the publisher was not waiting on the correct pid.
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
By replacing grpc with ttrpc, we can reduce total memory runtime
requirements and binary size. With minimal code changes, the shim can
now be controlled by the much lightweight protocol, reducing the total
memory required per container.
When reviewing this change, take particular notice of the generated shim
code.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
The syscall package is locked down and the comment in [1] advises to
switch code to use the corresponding package from golang.org/x/sys. Do
so and replace usage of package syscall with package
golang.org/x/sys/{unix,windows} where applicable.
[1] https://github.com/golang/go/blob/master/src/syscall/syscall.go#L21-L24
This will also allow to get updates and fixes for syscall wrappers
without having to use a new go version.
Errno, Signal and SysProcAttr aren't changed as they haven't been
implemented in x/sys/. Stat_t from syscall is used if standard library
packages (e.g. os) require it. syscall.ENOTSUP, syscall.SIGKILL and
syscall.SIGTERM are used for cross-platform files.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Mounting as MS_SLAVE here breaks use cases which want to use
rootPropagation=shared in order to expose mounts to the host (and other
containers binding the same subtree), mounting as e.g. MS_SHARED is pointless
in this context so just remove.
Having done this we also need to arrange to manually clean up the mounts on
delete, so do so.
Note that runc will also setup root as required by rootPropagation, defaulting
to MS_PRIVATE.
Fixes#1132.
Signed-off-by: Ian Campbell <ian.campbell@docker.com>
Update go-runc to master with portability fixes.
Subreaper only exists on Linux, and only Linux runs the shim in a
mount namespace.
With these changes the shim compiles on Darwin, which means the
whole build compiles without errors now.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
