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path: root/libpod/container_exec.go
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* Remove all instances of named return "err" from LibpodMatthew Heon2020-07-09
| | | | | | | | | | | | | | | | | 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>
* move go module to v2Valentin Rothberg2020-07-06
| | | | | | | | | | | | | | | 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>
* Enable detached exec for remoteMatthew Heon2020-06-02
| | | | | | | | | | | | | | | | | | | | | | | The biggest obstacle here was cleanup - we needed a way to remove detached exec sessions after they exited, but there's no way to tell if an exec session will be attached or detached when it's created, and that's when we must add the exit command that would do the removal. The solution was adding a delay to the exit command (5 minutes), which gives sufficient time for attached exec sessions to retrieve the exit code of the session after it exits, but still guarantees that they will be removed, even for detached sessions. This requires Conmon 2.0.17, which has the new `--exit-delay` flag. As part of the exit command rework, we can drop the hack we were using to clean up exec sessions (remove them as part of inspect). This is a lot cleaner, and I'm a lot happier about it. Otherwise, this is just plumbing - we need a bindings call for detached exec, and that needed to be added to the tunnel mode backend for entities. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Enable cleanup processes for detached execMatthew Heon2020-05-20
| | | | | | | | | | | | | | | | | | | | | | The cleanup command creation logic is made public as part of this and wired such that we can call it both within SpecGen (to make container exit commands) and from the ABI detached exec handler. Exit commands are presently only used for detached exec, but theoretically could be turned on for all exec sessions if we wanted (I'm declining to do this because of potential overhead). I also forgot to copy the exit command from the exec config into the ExecOptions struct used by the OCI runtime, so it was not being added. There are also two significant bugfixes for exec in here. One is for updating the status of running exec sessions - this was always failing as I had coded it to remove the exit file *before* reading it, instead of after (oops). The second was that removing a running exec session would always fail because I inverted the check to see if it was running. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Add ability to clean up exec sessions with cleanupMatthew Heon2020-05-20
| | | | | | | | | | | | | | We need to be able to use cleanup processes to remove exec sessions as part of detached exec. This PR adds that ability. A new flag is added to `podman container cleanup`, `--exec`, to specify an exec session to be cleaned up. As part of this, ensure that `ExecCleanup` can clean up exec sessions that were running, but have since exited. This ensures that we can come back to an exec session that was running but has since stopped, and clean it up. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Add backend code for detached execMatthew Heon2020-05-20
| | | | | | | | | | | | As part of the massive exec rework, I stubbed out a function for non-detached exec, which is implemented here. It's largely similar to the existing exec functions, but missing a few pieces. This also involves implemented a new OCI runtime call for detached exec. Again, very similar to the other functions, but with a few missing pieces. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Add exit commands to exec sessionsMatthew Heon2020-05-20
| | | | | | | | | | | These are required for detached exec, where they will be used to clean up and remove exec sessions when they exit. As part of this, move all Exec related functionality for the Conmon OCI runtime into a separate file; the existing one was around 2000 lines. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Prune stale exec sessions on inspectMatthew Heon2020-05-14
| | | | | | | | | | | | | | | | | | | | The usual flow for exec is going to be: - Create exec session - Start and attach to exec session - Exec session exits, attach session terminates - Client does an exec inspect to pick up exit code The safest point to remove the exec session, without doing any database changes to track stale sessions, is to remove during the last part of this - the single inspect after the exec session exits. This is definitely different from Docker (which would retain the exec session for up to 10 minutes after it exits, where we will immediately discard) but should be close enough to be not noticeable in regular usage. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Don't fail when saving exec status fails on removed ctrMatthew Heon2020-05-14
| | | | | | | We can't save the exec session, but it's because the container is entirely gone, so no point erroring. Signed-off-by: Matthew Heon <mheon@redhat.com>
* Ensure that Streams are set to defaults for HTTP attachMatthew Heon2020-05-14
| | | | | | | | | | | If not overridden, we should use the attach configuration given when the exec session was first created. Also, setting streams should not conflict with a TTY - the two are allowed together with Attach and should be allowed together here. Signed-off-by: Matthew Heon <mheon@redhat.com>
* Add an initial implementation of HTTP-forwarded execMatthew Heon2020-05-14
| | | | | | | | | | | | | | | This is heavily based off the existing exec implementation, but does not presently share code with it, to try and ensure we don't break anything. Still to do: - Add code sharing with existing exec implementation - Wire in the frontend (exec HTTP endpoint) - Move all exec-related code in oci_conmon_linux.go into a new file - Investigate code sharing between HTTP attach and HTTP exec. Signed-off-by: Matthew Heon <mheon@redhat.com>
* v2podman attach and execBrent Baude2020-04-05
| | | | | | | | 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>
* Merge pull request #5573 from mheon/add_basic_exec_endpointsOpenShift Merge Robot2020-03-26
|\ | | | | Implement APIv2 Exec Create and Inspect Endpoints
| * Add bindings for Container Exec Create + InspectMatthew Heon2020-03-26
| | | | | | | | | | | | | | Also adds some basic tests for these two. More tests are needed but will have to wait for state to be finished. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
| * Implement APIv2 Exec Create and Inspect EndpointsMatthew Heon2020-03-23
| | | | | | | | | | | | Start and Resize require further implementation work. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* | Ensure that exec sends resize eventsMatthew Heon2020-03-25
|/ | | | | | | | | | | | | | | We previously tried to send resize events only after the exec session successfully started, which makes sense (we might drop an event or two that came in before the exec session started otherwise). However, the start function blocks, so waiting actually means we send no resize events at all, which is obviously worse than losing a few.. Sending resizes before attach starts seems to work fine in my testing, so let's do that until we get bug reports that it doesn't work. Fixes #5584 Signed-off-by: Matthew Heon <mheon@redhat.com>
* Add inspect for exec sessionsMatthew Heon2020-03-18
| | | | | | | This produces detailed information about the configuration of an exec session in a format suitable for the new HTTP API. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Add structure for new exec session tracking to DBMatthew Heon2020-03-18
As part of the rework of exec sessions, we need to address them independently of containers. In the new API, we need to be able to fetch them by their ID, regardless of what container they are associated with. Unfortunately, our existing exec sessions are tied to individual containers; there's no way to tell what container a session belongs to and retrieve it without getting every exec session for every container. This adds a pointer to the container an exec session is associated with to the database. The sessions themselves are still stored in the container. Exec-related APIs have been restructured to work with the new database representation. The originally monolithic API has been split into a number of smaller calls to allow more fine-grained control of lifecycle. Support for legacy exec sessions has been retained, but in a deprecated fashion; we should remove this in a few releases. Signed-off-by: Matthew Heon <matthew.heon@pm.me>