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path: root/libpod/container_api.go
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* Force Attach() to send a SIGWINCH and redrawMatthew Heon2020-09-10
| | | | | | | | | | | | | | | | | | 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>
* Send HTTP Hijack headers after successful attachMatthew Heon2020-08-27
| | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Switch all references to github.com/containers/libpod -> podmanDaniel J Walsh2020-07-28
| | | | Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* 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>
* log API: add context to allow for cancellingValentin Rothberg2020-07-09
| | | | | | | | | 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>
* 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>
* Allow recursive dependency start with Init()Matthew Heon2020-06-18
| | | | | | | | | | | | | | | | | | | | 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>
* Turn on More lintersDaniel J Walsh2020-06-15
| | | | | | | | | - misspell - prealloc - unparam - nakedret Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* WIP V2 attach bindings and testJhon Honce2020-05-13
| | | | | | | | * 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>
* Improve APIv2 support for AttachMatthew Heon2020-04-13
| | | | | | | | | | | | | | 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>
* 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>
* 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>
* Revert "exec: get the exit code from sync pipe instead of file"Matthew Heon2020-03-09
| | | | | | | | | This reverts commit 4b72f9e4013411208751df2a92ab9f322d4da5b2. Continues what began with revert of d3d97a25e8c87cf741b2e24ac01ef84962137106 in previous commit. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Revert "Exec: use ErrorConmonRead"Matthew Heon2020-03-09
| | | | | | | | | This reverts commit d3d97a25e8c87cf741b2e24ac01ef84962137106. This does not resolve the issues we expected it would, and has some unexpected side effects with the upcoming exec rework. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Revert "exec: fix error code when conmon fails"Matthew Heon2020-03-09
| | | | | | | | | This reverts commit 4632b81c81a73025a960e339f40bc805f8a6c70a. We are reverting #5373 as well, which lays the foundation for this commit, so it has to go as well. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Fix spelling mistakes in code found by codespellDaniel J Walsh2020-03-07
| | | | Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* exec: fix error code when conmon failsPeter Hunt2020-03-04
| | | | | | this is a cosmetic change that makes sure podman returns a sane error code when conmon dies underneath it Signed-off-by: Peter Hunt <pehunt@redhat.com>
* Exec: use ErrorConmonReadPeter Hunt2020-03-03
| | | | | | | | Before, we were using -1 as a bogus value in podman to signify something went wrong when reading from a conmon pipe. However, conmon uses negative values to indicate the runtime failed, and return the runtime's exit code. instead, we should use a bogus value that is actually bogus. Define that value in the define package as MinInt32 (-1<< 31 - 1), which is outside of the range of possible pids (-1 << 31) Signed-off-by: Peter Hunt <pehunt@redhat.com>
* exec: get the exit code from sync pipe instead of filePeter Hunt2020-03-03
| | | | | | | | Before, we were getting the exit code from the file, in which we waited an arbitrary amount of time (5 seconds) for the file, and segfaulted if we didn't find it. instead, we should be a bit more certain conmon has sent the exit code. Luckily, it sends the exit code along the sync pipe fd, so we can read it from there Adapt the ExecContainer interface to pass along a channel to get the pid and exit code from conmon, to be able to read both from the pipe Signed-off-by: Peter Hunt <pehunt@redhat.com>
* Allow devs to set labels in container images for default capabilities.Daniel J Walsh2020-03-02
| | | | | | | | | | | | | | | | This patch allows users to specify the list of capabilities required to run their container image. Setting a image/container label "io.containers.capabilities=setuid,setgid" tells podman that the contained image should work fine with just these two capabilties, instead of running with the default capabilities, podman will launch the container with just these capabilties. If the user or image specified capabilities that are not in the default set, the container will print an error message and will continue to run with the default capabilities. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* Merge pull request #5347 from baude/apiv2waitOpenShift Merge Robot2020-03-02
|\ | | | | rework apiv2 wait endpoint|binding
| * rework apiv2 wait endpoint|bindingBrent Baude2020-02-28
| | | | | | | | | | | | | | | | added the ability to wait on a condition (stopped, running, paused...) for a container. if a condition is not provided, wait will default to the stopped condition which uses the original wait code paths. if the condition is stopped, the container exit code will be returned. also, correct a mux issue we discovered. Signed-off-by: Brent Baude <bbaude@redhat.com>
* | Ensure that exec sessions inherit supplemental groupsMatthew Heon2020-02-28
|/ | | | | | | | This corrects a regression from Podman 1.4.x where container exec sessions inherited supplemental groups from the container, iff the exec session did not specify a user. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* add pkg/capabilitiesValentin Rothberg2020-02-14
| | | | | | | | | Add pkg/capabibilities to deal with capabilities. The code has been copied from Docker (and attributed with the copyright) but changed significantly to only do what we really need. The code has also been simplified and will perform better due to removed redundancy. Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
* Add an API for Attach over HTTP APIMatthew Heon2020-01-16
| | | | | | | | | | | | | | | | | | | | | | | | | | The new APIv2 branch provides an HTTP-based remote API to Podman. The requirements of this are, unfortunately, incompatible with the existing Attach API. For non-terminal attach, we need append a header to what was copied from the container, to multiplex STDOUT and STDERR; to do this with the old API, we'd need to copy into an intermediate buffer first, to handle the headers. To avoid this, provide a new API to handle all aspects of terminal and non-terminal attach, including closing the hijacked HTTP connection. This might be a bit too specific, but for now, it seems to be the simplest approach. At the same time, add a Resize endpoint. This needs to be a separate endpoint, so our existing channel approach does not work here. I wanted to rework the rest of attach at the same time (some parts of it, particularly how we start the Attach session and how we do resizing, are (in my opinion) handled much better here. That may still be on the table, but I wanted to avoid breaking existing APIs in this already massive change. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* if container is not in a pid namespace, stop all processesDaniel J Walsh2019-12-19
| | | | | | | | | When a container is in a PID namespace, it is enought to send the stop signal to the PID 1 of the namespace, only send signals to all processes in the container when the container is not in a pid namespace. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* Reap exec sessions on cleanup and removalMatthew Heon2019-12-12
| | | | | | | | | | | | | | | | | | | | | | We currently rely on exec sessions being removed from the state by the Exec() API itself, on detecting the session stopping. This is not a reliable method, though. The Podman frontend for exec could be killed before the session ended, or another Podman process could be holding the lock and prevent update (most notable in `run --rm`, when a container with an active exec session is stopped). To resolve this, add a function to reap active exec sessions from the state, and use it on cleanup (to clear sessions after the container stops) and remove (to do the same when --rm is passed). This is a bit more complicated than it ought to be because Kata and company exist, and we can't guarantee the exec session has a PID on the host, so we have to plumb this through to the OCI runtime. Fixes #4666 Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Add ContainerStateRemovingMatthew Heon2019-11-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When Libpod removes a container, there is the possibility that removal will not fully succeed. The most notable problems are storage issues, where the container cannot be removed from c/storage. When this occurs, we were faced with a choice. We can keep the container in the state, appearing in `podman ps` and available for other API operations, but likely unable to do any of them as it's been partially removed. Or we can remove it very early and clean up after it's already gone. We have, until now, used the second approach. The problem that arises is intermittent problems removing storage. We end up removing a container, failing to remove its storage, and ending up with a container permanently stuck in c/storage that we can't remove with the normal Podman CLI, can't use the name of, and generally can't interact with. A notable cause is when Podman is hit by a SIGKILL midway through removal, which can consistently cause `podman rm` to fail to remove storage. We now add a new state for containers that are in the process of being removed, ContainerStateRemoving. We set this at the beginning of the removal process. It notifies Podman that the container cannot be used anymore, but preserves it in the DB until it is fully removed. This will allow Remove to be run on these containers again, which should successfully remove storage if it fails. Fixes #3906 Signed-off-by: Matthew Heon <mheon@redhat.com>
* podman: add support for specifying MACJakub Filak2019-11-06
| | | | | | | | I basically copied and adapted the statements for setting IP. Closes #1136 Signed-off-by: Jakub Filak <jakub.filak@sap.com>
* Switch to bufio Reader for exec streamsPeter Hunt2019-10-31
| | | | | | | | There were many situations that made exec act funky with input. pipes didn't work as expected, as well as sending input before the shell opened. Thinking about it, it seemed as though the issues were because of how os.Stdin buffers (it doesn't). Dropping this input had some weird consequences. Instead, read from os.Stdin as bufio.Reader, allowing the input to buffer before passing it to the container. Signed-off-by: Peter Hunt <pehunt@redhat.com>
* Add ensureState helper for checking container stateMatthew Heon2019-10-28
| | | | | | | | | | | | | | | | We have a lot of checks for container state scattered throughout libpod. Many of these need to ensure the container is in one of a given set of states so an operation may safely proceed. Previously there was no set way of doing this, so we'd use unique boolean logic for each one. Introduce a helper to standardize state checks. Note that this is only intended to replace checks for multiple states. A simple check for one state (ContainerStateRunning, for example) should remain a straight equality, and not use this new helper. Signed-off-by: Matthew Heon <mheon@redhat.com>
* Add a MissingRuntime implementationMatthew Heon2019-10-15
| | | | | | | | | | | | | | | | | When a container is created with a given OCI runtime, but then it is uninstalled or removed from the configuration file, Libpod presently reacts very poorly. The EvictContainer code can potentially remove these containers, but we still can't see them in `podman ps` (aside from the massive logrus.Errorf messages they create). Providing a minimal OCI runtime implementation for missing runtimes allows us to behave better. We'll be able to retrieve containers from the database, though we still pop up an error for each missing runtime. For containers which are stopped, we can remove them as normal. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Move OCI runtime implementation behind an interfaceMatthew Heon2019-10-10
| | | | | | | | | | | | For future work, we need multiple implementations of the OCI runtime, not just a Conmon-wrapped runtime matching the runc CLI. As part of this, do some refactoring on the interface for exec (move to a struct, not a massive list of arguments). Also, add 'all' support to Kill and Stop (supported by runc and used a bit internally for removing containers). Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* Podman-remote run should wait for exit codeDaniel J Walsh2019-09-12
| | | | | | | | This change matches what is happening on the podman local side and should eliminate a race condition. Also exit commands on the server side should start to return to client. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* Use exit code constantsDaniel J Walsh2019-09-12
| | | | | | | We have leaked the exit number codess all over the code, this patch removes the numbers to constants. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
* libpod: avoid polling container statusGiuseppe Scrivano2019-09-04
| | | | | | | | | | | | | | | | | | | | | | | use the inotify backend to be notified on the container exit instead of polling continuosly the runtime. Polling the runtime slowns significantly down the podman execution time for short lived processes: $ time bin/podman run --rm -ti fedora true real 0m0.324s user 0m0.088s sys 0m0.064s from: $ time podman run --rm -ti fedora true real 0m4.199s user 0m5.339s sys 0m0.344s Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
* exec: run with user specified on container startPeter Hunt2019-08-20
| | | | | | | Before, if the container was run with a specified user that wasn't root, exec would fail because it always set to root unless respecified by user. instead, inherit the user from the container start. Signed-off-by: Peter Hunt <pehunt@redhat.com>
* Merge pull request #3690 from adrianreber/ignore-static-ipOpenShift Merge Robot2019-08-05
|\ | | | | restore: added --ignore-static-ip option
| * restore: added --ignore-static-ip optionAdrian Reber2019-08-02
| | | | | | | | | | | | | | | | | | | | If a container is restored multiple times from an exported checkpoint with the help of '--import --name', the restore will fail if during 'podman run' a static container IP was set with '--ip'. The user can tell the restore process to ignore the static IP with '--ignore-static-ip'. Signed-off-by: Adrian Reber <areber@redhat.com>
* | Ensure we generate a 'stopped' event on force-removeMatthew Heon2019-07-31
|/ | | | | | | | | | | | | | When forcibly removing a container, we are initiating an explicit stop of the container, which is not reflected in 'podman events'. Swap to using our standard 'stop()' function instead of a custom one for force-remove, and move the event into the internal stop function (so internal calls also register it). This does add one more database save() to `podman remove`. This should not be a terribly serious performance hit, and does have the desirable side effect of making things generally safer. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
* move editing of exitCode to runtimePeter Hunt2019-07-23
| | | | | | | | | There's no way to get the error if we successfully get an exit code (as it's just printed to stderr instead). instead of relying on the error to be passed to podman, and edit based on the error code, process it on the varlink side instead Also move error codes to define package Signed-off-by: Peter Hunt <pehunt@redhat.com>
* Implement conmon execPeter Hunt2019-07-22
| | | | | | | | | | | | | | | | | | | | | | This includes: Implement exec -i and fix some typos in description of -i docs pass failed runtime status to caller Add resize handling for a terminal connection Customize exec systemd-cgroup slice fix healthcheck fix top add --detach-keys Implement podman-remote exec (jhonce) * Cleanup some orphaned code (jhonce) adapt remote exec for conmon exec (pehunt) Fix healthcheck and exec to match docs Introduce two new OCIRuntime errors to more comprehensively describe situations in which the runtime can error Use these different errors in branching for exit code in healthcheck and exec Set conmon to use new api version Signed-off-by: Jhon Honce <jhonce@redhat.com> Signed-off-by: Peter Hunt <pehunt@redhat.com>
* golangci-lint round #3baude2019-07-21
| | | | | | | this is the third round of preparing to use the golangci-lint on our code base. Signed-off-by: baude <bbaude@redhat.com>
* Merge pull request #3443 from adrianreber/rootfs-changes-migrationOpenShift Merge Robot2019-07-19
|\ | | | | Include changes to the container's root file-system in the checkpoint archive
| * Add --ignore-rootfs option for checkpoint/restoreAdrian Reber2019-07-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The newly added functionality to include the container's root file-system changes into the checkpoint archive can now be explicitly disabled. Either during checkpoint or during restore. If a container changes a lot of files during its runtime it might be more effective to migrated the root file-system changes in some other way and to not needlessly increase the size of the checkpoint archive. If a checkpoint archive does not contain the root file-system changes information it will automatically be skipped. If the root file-system changes are part of the checkpoint archive it is also possible to tell Podman to ignore these changes. Signed-off-by: Adrian Reber <areber@redhat.com>
| * Fix typo in checkpoint/restore related textsAdrian Reber2019-07-11
| | | | | | | | Signed-off-by: Adrian Reber <areber@redhat.com>
* | Remove exec PID files after use to prevent memory leaksMatthew Heon2019-07-18
| | | | | | | | | | | | | | | | | | | | | | | | We have another patch running to do the same for exit files, with a much more in-depth explanation of why it's necessary. Suffice to say that persistent files in tmpfs tied to container CGroups lead to significant memory allocations that last for the lifetime of the file. Based on a patch by Andrea Arcangeli (aarcange@redhat.com). Signed-off-by: Matthew Heon <mheon@redhat.com>
* | golangci-lint pass number 2baude2019-07-11
|/ | | | | | clean up and prepare to migrate to the golangci-linter Signed-off-by: baude <bbaude@redhat.com>
* Merge pull request #3324 from marcov/detach-keys-configurableOpenShift Merge Robot2019-07-01
|\ | | | | libpod: specify a detach keys sequence in libpod.conf
| * libpod: fix hang on container start and attachMarco Vedovati2019-06-26
| | | | | | | | | | | | | | | | | | | | When a container is attached upon start, the WaitGroup counter may never be decremented if an error is raised before start, causing the caller to hang. Synchronize with the start & attach goroutine using a channel, to be able to detect failures before start. Signed-off-by: Marco Vedovati <mvedovati@suse.com>
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