| Commit message (Collapse) | Author | Age |
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Fix: Prevent OCI runtime directory remain
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This bug was introduced in https://github.com/containers/podman/pull/8906.
When we use 'podman rm/restart/stop/kill etc...' command to
the container running with --rm, the OCI runtime directory
remains at /run/<runtime name> (root user) or
/run/user/<user id>/<runtime name> (rootless user).
This bug could cause other bugs.
For example, when we checkpoint the container running with
--rm (podman checkpoint --export) and restore it
(podman restore --import) with crun, error message
"Error: OCI runtime error: crun: container `<container id>`
already exists" is outputted.
This error is caused by an attempt to restore the container with
the same container ID as the remaining OCI runtime's container ID.
Therefore, I fix that the cleanupRuntime() function runs to
remove the OCI runtime directory,
even if the container has already been removed by --rm option.
Signed-off-by: Toshiki Sonoda <sonoda.toshiki@fujitsu.com>
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This commit addresses three intertwined bugs to fix an issue when using
Gitlab runner on Podman. The three bug fixes are not split into
separate commits as tests won't pass otherwise; avoidable noise when
bisecting future issues.
1) Podman conflated states: even when asking to wait for the `exited`
state, Podman returned as soon as a container transitioned to
`stopped`. The issues surfaced in Gitlab tests to fail [1] as
`conmon`'s buffers have not (yet) been emptied when attaching to a
container right after a wait. The race window was extremely narrow,
and I only managed to reproduce with the Gitlab runner [1] unit
tests.
2) The clearer separation between `exited` and `stopped` revealed a race
condition predating the changes. If a container is configured for
autoremoval (e.g., via `run --rm`), the "run" process competes with
the "cleanup" process running in the background. The window of the
race condition was sufficiently large that the "cleanup" process has
already removed the container and storage before the "run" process
could read the exit code and hence waited indefinitely.
Address the exit-code race condition by recording exit codes in the
main libpod database. Exit codes can now be read from a database.
When waiting for a container to exit, Podman first waits for the
container to transition to `exited` and will then query the database
for its exit code. Outdated exit codes are pruned during cleanup
(i.e., non-performance critical) and when refreshing the database
after a reboot. An exit code is considered outdated when it is older
than 5 minutes.
While the race condition predates this change, the waiting process
has apparently always been fast enough in catching the exit code due
to issue 1): `exited` and `stopped` were conflated. The waiting
process hence caught the exit code after the container transitioned
to `stopped` but before it `exited` and got removed.
3) With 1) and 2), Podman is now waiting for a container to properly
transition to the `exited` state. Some tests did not pass after 1)
and 2) which revealed the third bug: `conmon` was executed with its
working directory pointing to the OCI runtime bundle of the
container. The changed working directory broke resolving relative
paths in the "cleanup" process. The "cleanup" process error'ed
before actually cleaning up the container and waiting "main" process
ran indefinitely - or until hitting a timeout. Fix the issue by
executing `conmon` with the same working directory as Podman.
Note that fixing 3) *may* address a number of issues we have seen in the
past where for *some* reason cleanup processes did not fire.
[1] https://gitlab.com/gitlab-org/gitlab-runner/-/issues/27119#note_970712864
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>
[MH: Minor reword of commit message]
Signed-off-by: Matthew Heon <mheon@redhat.com>
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Move Attach under the OCI Runtime interface
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With conmon-rs on the horizon, we need to disentangle Libpod from
legacy Conmon to the greatest extent possible. There are
definitely opportunities for codesharing between the two, but we
have to assume the implementations will be largely disjoint given
the different architectures.
Fortunately, most of the work has already been done in the past.
The conmon-managed OCI runtime mostly sits behind an interface,
with a few exceptions - the most notable of those being attach.
This PR thus moves Attach behind the interface, to ensure that we
can have attach implementations that don't use our existing unix
socket streaming if necessary.
Still to-do is conmon cleanup. There's a lot of code that removes
Conmon-specific files, or kills the Conmon PID, and all of it
will need to be refactored behind the interface.
[NO NEW TESTS NEEDED] Just moving some things around.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Update method signatures and structs to pass option to buildah code
```release-note
NONE
```
[NO NEW TESTS NEEDED]
Signed-off-by: Jhon Honce <jhonce@redhat.com>
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Most of these are no longer relevant, just drop the comments.
Most notable change: allow `podman kill` on paused containers.
Works just fine when I test it.
Signed-off-by: Matthew Heon <mheon@redhat.com>
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The linter ensures a common code style.
- use switch/case instead of else if
- use if instead of switch/case for single case statement
- add space between comment and text
- detect the use of defer with os.Exit()
- use short form var += "..." instead of var = var + "..."
- detect problems with append()
```
newSlice := append(orgSlice, val)
```
This could lead to nasty bugs because the orgSlice will be changed in
place if it has enough capacity too hold the new elements. Thus we
newSlice might not be a copy.
Of course most of the changes are just cosmetic and do not cause any
logic errors but I think it is a good idea to enforce a common style.
This should help maintainability.
Signed-off-by: Paul Holzinger <pholzing@redhat.com>
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The unparam linter is useful to detect unused function parameters and
return values.
Signed-off-by: Paul Holzinger <pholzing@redhat.com>
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This is an enhancement proposal for the checkpoint / restore feature of
Podman that enables container migration across multiple systems with
standard image distribution infrastructure.
A new option `--create-image <image>` has been added to the
`podman container checkpoint` command. This option tells Podman to
create a container image. This is a standard image with a single layer,
tar archive, that that contains all checkpoint files. This is similar to
the current approach with checkpoint `--export`/`--import`.
This image can be pushed to a container registry and pulled on a
different system. It can also be exported locally with `podman image
save` and inspected with `podman inspect`. Inspecting the image would
display additional information about the host and the versions of
Podman, criu, crun/runc, kernel, etc.
`podman container restore` has also been extended to support image
name or ID as input.
Suggested-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Radostin Stoyanov <radostin@redhat.com>
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Numerous issues remain, especially in tests/e2e.
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>
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Automated for .go files via gomove [1]:
`gomove github.com/containers/podman/v3 github.com/containers/podman/v4`
Remaining files via vgrep [2]:
`vgrep github.com/containers/podman/v3`
[1] https://github.com/KSubedi/gomove
[2] https://github.com/vrothberg/vgrep
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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CRIU supports checkpoint/restore of file locks. This feature is
required to checkpoint/restore containers running applications
such as MySQL.
Signed-off-by: Radostin Stoyanov <radostin@redhat.com>
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This adds the parameter '--print-stats' to 'podman container restore'.
With '--print-stats' Podman will measure how long Podman itself, the OCI
runtime and CRIU requires to restore a checkpoint and print out these
information. CRIU already creates process restore statistics which are
just read in addition to the added measurements. In contrast to just
printing out the ID of the restored container, Podman will now print
out JSON:
# podman container restore --latest --print-stats
{
"podman_restore_duration": 305871,
"container_statistics": [
{
"Id": "47b02e1d474b5d5fe917825e91ac653efa757c91e5a81a368d771a78f6b5ed20",
"runtime_restore_duration": 140614,
"criu_statistics": {
"forking_time": 5,
"restore_time": 67672,
"pages_restored": 14
}
}
]
}
The output contains 'podman_restore_duration' which contains the
number of microseconds Podman required to restore the checkpoint. The
output also includes 'runtime_restore_duration' which is the time
the runtime needed to restore that specific container. Each container
also includes 'criu_statistics' which displays the timing information
collected by CRIU.
Signed-off-by: Adrian Reber <areber@redhat.com>
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This adds the parameter '--print-stats' to 'podman container checkpoint'.
With '--print-stats' Podman will measure how long Podman itself, the OCI
runtime and CRIU requires to create a checkpoint and print out these
information. CRIU already creates checkpointing statistics which are
just read in addition to the added measurements. In contrast to just
printing out the ID of the checkpointed container, Podman will now print
out JSON:
# podman container checkpoint --latest --print-stats
{
"podman_checkpoint_duration": 360749,
"container_statistics": [
{
"Id": "25244244bf2efbef30fb6857ddea8cb2e5489f07eb6659e20dda117f0c466808",
"runtime_checkpoint_duration": 177222,
"criu_statistics": {
"freezing_time": 100657,
"frozen_time": 60700,
"memdump_time": 8162,
"memwrite_time": 4224,
"pages_scanned": 20561,
"pages_written": 2129
}
}
]
}
The output contains 'podman_checkpoint_duration' which contains the
number of microseconds Podman required to create the checkpoint. The
output also includes 'runtime_checkpoint_duration' which is the time
the runtime needed to checkpoint that specific container. Each container
also includes 'criu_statistics' which displays the timing information
collected by CRIU.
Signed-off-by: Adrian Reber <areber@redhat.com>
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The backend for `ps --sync` has been nonfunctional for a long
while now - probably since v2.0. It's questionable how useful the
flag is in modern Podman (the original case it was intended to
catch, Conmon gone via SIGKILL, should be handled now via pinging
the process with a signal to ensure it's still alive) but having
the ability to force a refresh of container state from the OCI
runtime is still useful.
Signed-off-by: Matthew Heon <mheon@redhat.com>
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This allows you to stop a container after a `podman stop` process
started, but did not finish, stopping the container (probably an
ignored stop signal, with no time to SIGKILL?). This is a very
narrow case, but once you're in it the only way to recover is a
`podman rm -f` of the container or extensive manual remediation
(you'd have to kill the container yourself, manually, and then
force a `podman ps --all --sync` to update its status from the
OCI runtime).
[NO NEW TESTS NEEDED] I have no idea how to verify this one -
we need to test that it actually started *during* the other stop
command, and that's nontrivial.
Signed-off-by: Matthew Heon <mheon@redhat.com>
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it allows to pass the current std streams down to the container.
conmon support: https://github.com/containers/conmon/pull/289
[NO TESTS NEEDED] it needs a new conmon.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Remove ERROR: Error stutter from logrus messages also.
[ NO TESTS NEEDED] This is just code cleanup.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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adrianreber/2021-07-12-checkpoint-restore-into-pod
Add support for checkpoint/restore into and out of pods
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This adds support to checkpoint containers out of pods and restore
container into pods.
It is only possible to restore a container into a pod if it has been
checkpointed out of pod. It is also not possible to restore a non pod
container into a pod.
The main reason this does not work is the PID namespace. If a non pod
container is being restored in a pod with a shared PID namespace, at
least one process in the restored container uses PID 1 which is already
in use by the infrastructure container. If someone tries to restore
container from a pod with a shared PID namespace without a shared PID
namespace it will also fail because the resulting PID namespace will not
have a PID 1.
Signed-off-by: Adrian Reber <areber@redhat.com>
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Implement container to container copy. Previously data could only be
copied from/to the host.
Fixes: #7370
Co-authored-by: Mehul Arora <aroram18@mcmaster.ca>
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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Signed-off-by: Matej Vasek <mvasek@redhat.com>
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The checkpoint archive compression was hardcoded to `archive.Gzip`.
There have been requests to make the used compression algorithm
selectable. There was especially the request to not compress the
checkpoint archive to be able to create faster checkpoints when not
compressing it.
This also changes the default from `gzip` to `zstd`. This change should
not break anything as the restore code path automatically handles
whatever compression the user provides during restore.
Signed-off-by: Adrian Reber <areber@redhat.com>
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The --trace has helped in early stages analyze Podman code. However,
it's contributing to dependency and binary bloat. The standard go
tooling can also help in profiling, so let's turn `--trace` into a NOP.
[NO TESTS NEEDED]
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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Traditionally, the path resolution for containers has been resolved on
the *host*; relative to the container's mount point or relative to
specified bind mounts or volumes.
While this works nicely for non-running containers, it poses a problem
for running ones. In that case, certain kinds of mounts (e.g., tmpfs)
will not resolve correctly. A tmpfs is held in memory and hence cannot
be resolved relatively to the container's mount point. A copy operation
will succeed but the data will not show up inside the container.
To support these kinds of mounts, we need to join the *running*
container's mount namespace (and PID namespace) when copying.
Note that this change implies moving the copy and stat logic into
`libpod` since we need to keep the container locked to avoid race
conditions. The immediate benefit is that all logic is now inside
`libpod`; the code isn't scattered anymore.
Further note that Docker does not support copying to tmpfs mounts.
Tests have been extended to cover *both* path resolutions for running
and created containers. New tests have been added to exercise the
tmpfs-mount case.
For the record: Some tests could be improved by using `start -a` instead
of a start-exec sequence. Unfortunately, `start -a` is flaky in the CI
which forced me to use the more expensive start-exec option.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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prune a dependency that was only being used for a simple struct. Should
correct checksum issue on tarballs
[NO TESTS NEEDED]
Fixes: #9355
Signed-off-by: baude <bbaude@redhat.com>
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We missed bumping the go module, so let's do it now :)
* Automated go code with github.com/sirkon/go-imports-rename
* Manually via `vgrep podman/v2` the rest
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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Signed-off-by: Matej Vasek <mvasek@redhat.com>
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Signed-off-by: Matej Vasek <mvasek@redhat.com>
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Add an API to libpod to resolve a path on the container. We can
refactor the code that was originally written for copy. Other
functions are requiring a proper path resolution, so libpod seems
like a reasonable home for sharing that code.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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container stop: release lock before calling the runtime
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Podman defers stopping the container to the runtime, which can take some
time. Keeping the lock while waiting for the runtime to complete the
stop procedure, prevents other commands from acquiring the lock as shown
in #8501.
To improve the user experience, release the lock before invoking the
runtime, and re-acquire the lock when the runtime is finished. Also
introduce an intermediate "stopping" to properly distinguish from
"stopped" containers etc.
Fixes: #8501
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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Signed-off-by: Zhuohan Chen <chen_zhuohan@163.com>
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When migrating a container with associated volumes, the content of
these volumes should be made available on the destination machine.
This patch enables container checkpoint/restore with named volumes
by including the content of volumes in checkpoint file. On restore,
volumes associated with container are created and their content is
restored.
The --ignore-volumes option is introduced to disable this feature.
Example:
# podman container checkpoint --export checkpoint.tar.gz <container>
The content of all volumes associated with the container are included
in `checkpoint.tar.gz`
# podman container checkpoint --export checkpoint.tar.gz --ignore-volumes <container>
The content of volumes is not included in `checkpoint.tar.gz`. This is
useful, for example, when the checkpoint/restore is performed on the
same machine.
# podman container restore --import checkpoint.tar.gz
The associated volumes will be created and their content will be
restored. Podman will exit with an error if volumes with the same
name already exist on the system or the content of volumes is not
included in checkpoint.tar.gz
# podman container restore --ignore-volumes --import checkpoint.tar.gz
Volumes associated with container must already exist. Podman will not
create them or restore their content.
Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>
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Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>
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This adds a new command, 'podman network reload', to reload the
networks of existing containers, forcing recreation of firewall
rules after e.g. `firewall-cmd --reload` wipes them out.
Under the hood, this works by calling CNI to tear down the
existing network, then recreate it using identical settings. We
request that CNI preserve the old IP and MAC address in most
cases (where the container only had 1 IP/MAC), but there will be
some downtime inherent to the teardown/bring-up approach. The
architecture of CNI doesn't really make doing this without
downtime easy (or maybe even possible...).
At present, this only works for root Podman, and only locally.
I don't think there is much of a point to adding remote support
(this is very much a local debugging command), but I think adding
rootless support (to kill/recreate slirp4netns) could be
valuable.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
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Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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We only use this channel in terminal attach, and it was not a
buffered channel originally, so it would block on trying to send
unless a receiver was ready. In the non-terminal case, there was
no receiver, so attach blocked forever. Buffer the channel for a
single bool so that it will never block, even if unused.
Fixes #8154
Signed-off-by: Matthew Heon <mheon@redhat.com>
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Basically, we want to force the application in the container to
(iff the container was made with a terminal) redraw said terminal
immediately after an attach completes, so the fresh Attach
session will be able to see what's going on (e.g. will have a
shell prompt). Our current attach functions are unfortunately
geared more towards `podman run` than `podman attach` and will
start forwarding resize events *immediately* instead of waiting
until the attach session is alive (much safer for short-lived
`podman run` sessions, but broken for the `podman attach` case).
To avoid a major rewrite, let's just manually send a SIGWINCH
after attach succeeds to force a redraw.
Fixes #6253
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Our previous flow was to perform a hijack before passing a
connection into Libpod, and then Libpod would attach to the
container's attach socket and begin forwarding traffic.
A problem emerges: we write the attach header as soon as the
attach complete. As soon as we write the header, the client
assumes that all is ready, and sends a Start request. This Start
may be processed *before* we successfully finish attaching,
causing us to lose output.
The solution is to handle hijacking inside Libpod. Unfortunately,
this requires a downright extensive refactor of the Attach and
HTTP Exec StartAndAttach code. I think the result is an
improvement in some places (a lot more errors will be handled
with a proper HTTP error code, before the hijack occurs) but
other parts, like the relocation of printing container logs, are
just *bad*. Still, we need this fixed now to get CI back into
good shape...
Fixes #7195
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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This was inspired by https://github.com/cri-o/cri-o/pull/3934 and
much of the logic for it is contained there. However, in brief,
a named return called "err" can cause lots of code confusion and
encourages using the wrong err variable in defer statements,
which can make them work incorrectly. Using a separate name which
is not used elsewhere makes it very clear what the defer should
be doing.
As part of this, remove a large number of named returns that were
not used anywhere. Most of them were once needed, but are no
longer necessary after previous refactors (but were accidentally
retained).
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Add a `context.Context` to the log APIs to allow for cancelling
streaming (e.g., via `podman logs -f`). This fixes issues for
the remote API where some go routines of the server will continue
writing and produce nothing but heat and waste CPU cycles.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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With the advent of Podman 2.0.0 we crossed the magical barrier of go
modules. While we were able to continue importing all packages inside
of the project, the project could not be vendored anymore from the
outside.
Move the go module to new major version and change all imports to
`github.com/containers/libpod/v2`. The renaming of the imports
was done via `gomove` [1].
[1] https://github.com/KSubedi/gomove
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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As part of APIv2 Attach, we need to be able to attach to freshly
created containers (in ContainerStateConfigured). This isn't
something Libpod is interested in supporting, so we use Init() to
get the container into ContainerStateCreated, in which attach is
possible. Problem: Init() will fail if dependencies are not
started, so a fresh container in a fresh pod will fail. The
simplest solution is to extend the existing recursive start code
from Start() to Init(), allowing dependency containers to be
started when we initialize the container (optionally, controlled
via bool).
Also, update some comments in container_api.go to make it more
clear how some of our major API calls work.
Fixes #6646
Signed-off-by: Matthew Heon <mheon@redhat.com>
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- misspell
- prealloc
- unparam
- nakedret
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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* Add ErrLostSync to report lost of sync when de-mux'ing stream
* Add logus.SetLevel(logrus.DebugLevel) when `go test -v` given
* Add context to debugging messages
Signed-off-by: Jhon Honce <jhonce@redhat.com>
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A few major fixes here:
- Support for attaching to Configured containers, to match Docker
behavior.
- Support for stream parameter has been improved (we now properly
handle cases where it is not set).
- Initial support for logs parameter has been added.
- Setting attach streams when the container has a terminal is now
supported.
- Errors are properly reported once the hijack has begun.
Signed-off-by: Matthew Heon <mheon@redhat.com>
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add the ability to attach to a running container. the tunnel side of this is not enabled yet as we have work on the endpoints and plumbing to do yet.
add the ability to exec a command in a running container. the tunnel side is also being deferred for same reason.
Signed-off-by: Brent Baude <bbaude@redhat.com>
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