summaryrefslogtreecommitdiff
path: root/libpod/container_path_resolution.go
Commit message (Collapse)AuthorAge
* podman cp: support copying on tmpfs mountsValentin Rothberg2021-03-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Enable whitespace linterPaul Holzinger2021-02-11
| | | | | | | | Use the whitespace linter and fix the reported problems. [NO TESTS NEEDED] Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
* Enable stylecheck linterPaul Holzinger2021-02-11
| | | | | | | | Use the stylecheck linter and fix the reported problems. [NO TESTS NEEDED] Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
* workdir presence checksValentin Rothberg2021-01-26
| | | | | | | | | | | | | | | | | | A container's workdir can be specified via the CLI via `--workdir` and via an image config with the CLI having precedence. Since images have a tendency to specify workdirs without necessarily shipping the paths with the root FS, make sure that Podman creates the workdir. When specified via the CLI, do not create the path, but check for its existence and return a human-friendly error. NOTE: `crun` is performing a similar check that would yield exit code 127. With this change, however, Podman performs the check and yields exit code 126. Since this is specific to `crun`, I do not consider it to be a breaking change of Podman. Fixes: #9040 Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
* libpod: add (*Container).ResolvePath()Valentin Rothberg2021-01-26
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>