Features
- A set of new commands has been added to manage secrets! The `podman secret create`, `podman secret inspect`, `podman secret ls` and `podman secret rm` commands have been added to handle secrets, along with the `--secret` option to `podman run` and `podman create` to add secrets to containers. The initial driver for secrets does not support encryption - this will be added in a future release.
- A new command to prune networks, `podman network prune`, has been added ([8673](https://github.com/containers/podman/issues/8673)).
- The `-v` option to `podman run` and `podman create` now supports a new volume option, `:U`, to chown the volume's source directory on the host to match the UID and GID of the container and prevent permissions issues ([7778](https://github.com/containers/podman/issues/7778)).
- Three new commands, `podman network exists`, `podman volume exists`, and `podman manifest exists`, have been added to check for the existence of networks, volumes, and manifest lists.
- The `podman cp` command can now copy files into directories mounted as `tmpfs` in a running container.
- The `podman volume prune` command will now list volumes that will be pruned when prompting the user whether to continue and perform the prune ([8913](https://github.com/containers/podman/issues/8913)).
- The Podman remote client's `podman build` command now supports the `--disable-compression`, `--excludes`, and `--jobs` options.
- The Podman remote client's `podman push` command now supports the `--format` option.
- The Podman remote client's `podman rm` command now supports the `--all` and `--ignore` options.
- The Podman remote client's `podman search` command now supports the `--no-trunc` and `--list-tags` options.
- The `podman play kube` command can now read in Kubernetes YAML from `STDIN` when `-` is specified as file name (`podman play kube -`), allowing input to be piped into the command for scripting ([8996](https://github.com/containers/podman/issues/8996)).
- The `podman generate systemd` command now supports a `--no-header` option, which disables creation of the header comment automatically added by Podman to generated unit files.
- The `podman generate kube` command can now generate `PersistentVolumeClaim` YAML for Podman named volumes ([5788](https://github.com/containers/podman/issues/5788)).
- The `podman generate kube` command can now generate YAML files containing multiple resources (pods or deployments) ([9129](https://github.com/containers/podman/issues/9129)).
Security
- This release resolves CVE-2021-20291, a deadlock vulnerability in the storage library caused by pulling a specially-crafted container image.
Changes
- The Podman remote client's `podman build` command no longer allows the `-v` flag to be used. Volumes are not yet supported with remote Podman when the client and service are on different machines.
- The `podman kill` and `podman stop` commands now print the name given by the user for each container, instead of the full ID.
- When the `--security-opt unmask=ALL` or `--security-opt unmask=/sys/fs/cgroup` options to `podman create` or `podman run` are given, Podman will mount cgroups into the container as read-write, instead of read-only ([8441](https://github.com/containers/podman/issues/8441)).
- The `podman rmi` command has been changed to better handle cases where an image is incomplete or corrupted, which can be caused by interrupted image pulls.
- The `podman rename` command has been improved to be more atomic, eliminating many race conditions that could potentially render a renamed container unusable.
- Detection of which OCI runtimes run using virtual machines and thus require custom SELinux labelling has been improved ([9582](https://github.com/containers/podman/issues/9582)).
- The hidden `--trace` option to `podman` has been turned into a no-op. It was used in very early versions for performance tracing, but has not been supported for some time.
- The `podman generate systemd` command now generates `RequiresMountsFor` lines to ensure necessary storage directories are mounted before systemd starts Podman.
- Podman will now emit a warning when `--tty` and `--interactive` are both passed, but `STDIN` is not a TTY. This will be made into an error in the next major Podman release some time next year.
Bugfixes
- Fixed a bug where rootless Podman containers joined to CNI networks could not receive traffic from forwarded ports ([9065](https://github.com/containers/podman/issues/9065)).
- Fixed a bug where `podman network create` with the `--macvlan` flag did not honor the `--gateway`, `--subnet`, and `--opt` options ([9167](https://github.com/containers/podman/issues/9167)).
- Fixed a bug where the `podman generate kube` command generated invalid YAML for privileged containers ([8897](https://github.com/containers/podman/issues/8897)).
- Fixed a bug where the `podman generate kube` command could not be used with containers that were not running.
- Fixed a bug where the `podman generate systemd` command could duplicate some parameters to Podman in generated unit files ([9776](https://github.com/containers/podman/issues/9776)).
- Fixed a bug where Podman did not add annotations specified in `containers.conf` to containers.
- Foxed a bug where Podman did not respect the `no_hosts` default in `containers.conf` when creating containers.
- Fixed a bug where the `--tail=0`, `--since`, and `--follow` options to the `podman logs` command did not function properly when using the `journald` log backend.
- Fixed a bug where specifying more than one container to `podman logs` when the `journald` log backend was in use did not function correctly.
- Fixed a bug where the `podman run` and `podman create` commands would panic if a memory limit was set, but the swap limit was set to unlimited ([9429](https://github.com/containers/podman/issues/9429)).
- Fixed a bug where the `--network` option to `podman run`, `podman create`, and `podman pod create` would error if the user attempted to specify CNI networks by ID, instead of name ([9451](https://github.com/containers/podman/issues/9451)).
- Fixed a bug where Podman's cgroup handling for cgroups v1 systems did not properly handle cases where a cgroup existed on some, but not all, controllers, resulting in errors from the `podman stats` command ([9252](https://github.com/containers/podman/issues/9252)).
- Fixed a bug where the `podman cp` did not properly handle cases where `/dev/stdout` was specified as the destination (it was treated identically to `-`) ([9362](https://github.com/containers/podman/issues/9362)).
- Fixed a bug where the `podman cp` command would create files with incorrect ownership ([9526](https://github.com/containers/podman/issues/9626)).
- Fixed a bug where the `podman cp` command did not properly handle cases where the destination directory did not exist.
- Fixed a bug where the `podman cp` command did not properly evaluate symlinks when copying out of containers.
- Fixed a bug where the `podman rm -fa` command would error when attempting to remove containers created with `--rm` ([9479](https://github.com/containers/podman/issues/9479)).
- Fixed a bug where the ordering of capabilities was nondeterministic in the `CapDrop` field of the output of `podman inspect` on a container ([9490](https://github.com/containers/podman/issues/9490)).
- Fixed a bug where the `podman network connect` command could be used with containers that were not initially connected to a CNI bridge network (e.g. containers created with `--net=host`) ([9496](https://github.com/containers/podman/issues/9496)).
- Fixed a bug where DNS search domains required by the `dnsname` CNI plugin were not being added to container's `resolv.conf` under some circumstances.
- Fixed a bug where the `--ignorefile` option to `podman build` was nonfunctional ([9570](https://github.com/containers/podman/issues/9570)).
- Fixed a bug where the `--timestamp` option to `podman build` was nonfunctional ([9569](https://github.com/containers/podman/issues/9569)).
- Fixed a bug where the `--iidfile` option to `podman build` could cause Podman to panic if an error occurred during the build.
- Fixed a bug where the `--dns-search` option to `podman build` was nonfunctional ([9574](https://github.com/containers/podman/issues/9574)).
- Fixed a bug where the `--pull-never` option to `podman build` was nonfunctional ([9573](https://github.com/containers/podman/issues/9573)).
- Fixed a bug where the `--build-arg` option to `podman build` would, when given a key but not a value, error (instead of attempting to look up the key as an environment variable) ([9571](https://github.com/containers/podman/issues/9571)).
- Fixed a bug where the `--isolation` option to `podman build` in the remote Podman client was nonfunctional.
- Fixed a bug where the `podman network disconnect` command could cause errors when the container that had a network removed was stopped and its network was cleaned up ([9602](https://github.com/containers/podman/issues/9602)).
- Fixed a bug where the `podman network rm` command did not properly check what networks a container was present in, resulting in unexpected behavior if `podman network connect` or `podman network disconnect` had been used with the network ([9632](https://github.com/containers/podman/issues/9632)).
- Fixed a bug where some errors with stopping a container could cause Podman to panic, and the container to be stuck in an unusable `stopping` state ([9615](https://github.com/containers/podman/issues/9615)).
- Fixed a bug where the `podman load` command could return 0 even in cases where an error occurred ([9672](https://github.com/containers/podman/issues/9672)).
- Fixed a bug where specifying storage options to Podman using the `--storage-opt` option would override all storage options. Instead, storage options are now overridden only when the `--storage-driver` option is used to override the current graph driver ([9657](https://github.com/containers/podman/issues/9657)).
- Fixed a bug where containers created with `--privileged` could request more capabilities than were available to Podman.
- Fixed a bug where `podman commit` did not use the `TMPDIR` environment variable to place temporary files created during the commit ([9825](https://github.com/containers/podman/issues/9825)).
- Fixed a bug where remote Podman could error when attempting to resize short-lived containers ([9831](https://github.com/containers/podman/issues/9831)).
- Fixed a bug where Podman was unusable on kernels built without `CONFIG_USER_NS`.
- Fixed a bug where the ownership of volumes created by `podman volume create` and then mounted into a container could be incorrect ([9608](https://github.com/containers/podman/issues/9608)).
- Fixed a bug where Podman volumes using a volume plugin could not pass certain options, and could not be used as non-root users.
- Fixed a bug where the `--tz` option to `podman create` and `podman run` did not properly validate its input.
API
- Fixed a bug where the `X-Registry-Auth` header did not accept `null` as a valid value.
- A new compat endpoint, `/auth`, has been added. This endpoint validates credentials against a registry ([9564](https://github.com/containers/podman/issues/9564)).
- Fixed a bug where the compat Build endpoint for Images specified labels using the wrong type (array vs map). Both formats will be accepted now.
- Fixed a bug where the compat Build endpoint for Images did not report that it successfully tagged the built image in its response.
- Fixed a bug where the compat Create endpoint for Images did not provide progress information on pulling the image in its response.
- Fixed a bug where the compat Push endpoint for Images did not properly handle the destination (used a query parameter, instead of a path parameter).
- Fixed a bug where the compat Push endpoint for Images did not send the progress of the push and the digest of the pushed image in the response body.
- Fixed a bug where the compat List endpoint for Networks returned null, instead of an empty array (`[]`), when no networks were present ([9293](https://github.com/containers/podman/issues/9293)).
- Fixed a bug where the compat List endpoint for Networks returned nulls, instead of empty maps, for networks that do not have Labels and/or Options.
- The Libpod Inspect endpoint for networks (`/libpod/network/$ID/json`) now has an alias at `/libpod/network/$ID` ([9691](https://github.com/containers/podman/issues/9691)).
- Fixed a bug where the libpod Inspect endpoint for Networks returned a 1-size array of results, instead of a single result ([9690](https://github.com/containers/podman/issues/9690)).
- The Compat List endpoint for Networks now supports the legacy format for filters in parallel with the current filter format ([9526](https://github.com/containers/podman/issues/9526)).
- Fixed a bug where the compat Create endpoint for Containers did not properly handle tmpfs filesystems specified with options ([9511](https://github.com/containers/podman/issues/9511)).
- Fixed a bug where the compat Create endpoint for Containers did not create bind-mount source directories ([9510](https://github.com/containers/podman/issues/9510)).
- Fixed a bug where the compat Create endpoint for Containers did not properly handle the `NanoCpus` option ([9523](https://github.com/containers/podman/issues/9523)).
- Fixed a bug where the Libpod create endpoint for Containers has a misnamed field in its JSON.
- Fixed a bug where the compat List endpoint for Containers did not populate information on forwarded ports ([9553](https://github.com/containers/podman/issues/9553))
- Fixed a bug where the compat List endpoint for Containers did not populate information on container CNI networks ([9529](https://github.com/containers/podman/issues/9529)).
- Fixed a bug where the compat and libpod Stop endpoints for Containers would ignore a timeout of 0.
- Fixed a bug where the compat and libpod Resize endpoints for Containers did not set the correct terminal sizes (dimensions were reversed) ([9756](https://github.com/containers/podman/issues/9756)).
- Fixed a bug where the compat Remove endpoint for Containers would not return 404 when attempting to remove a container that does not exist ([9675](https://github.com/containers/podman/issues/9675)).
- Fixed a bug where the compat Prune endpoint for Volumes would still prune even if an invalid filter was specified.
- Numerous bugs related to filters have been addressed.
Misc
- Updated Buildah to v1.20.0
- Updated the containers/storage library to v1.28.1
- Updated the containers/image library to v5.10.5
- Updated the containers/common library to v0.35.4