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We can easily tell if we're going to deadlock by comparing lock
IDs before actually taking the lock. Add a few checks for this in
common places where deadlocks might occur.
This does not yet cover pod operations, where detection is more
difficult (and costly) due to the number of locks being involved
being higher than 2.
Also, add some error wrapping on the Podman side, so we can tell
people to use `system renumber` when it occurs.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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If we attempt to label a volume and the file system
does not support labeling, then just warn. SELinux
may or may not work, on the volume.
There is no way to setup a private label on a newly
created volume without using the container mountlabel.
If we don't have a mount label at the time of creation of
the volume, the only option we have is to create a shared
label.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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`gocritic` is a powerful linter that helps in preventing certain kinds
of errors as well as enforcing a coding style.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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When you try and create a new volume with the name of a volume
that already exists, you presently get a thoroughly unhelpful
error from `mkdir` as the volume attempts to create the
directory it will be mounted at. An EEXIST out of mkdir is not
particularly helpful to Podman users - it doesn't explain that
the name is already taken by another volume.
The solution here is potentially racy as the runtime is not
locked, so someone else could take the name while we're still
getting things set up, but that's a narrow timing window, and we
will still return an error - just an error that's not as good as
this one.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Also, ensure that we don't try to mount them without root - it
appears that it can somehow not error and report that mount was
successful when it clearly did not succeed, which can induce this
case.
We reuse the `--force` flag to indicate that a volume should be
removed even after unmount errors. It seems fairly natural to
expect that --force will remove a volume that is otherwise
presenting problems.
Finally, ignore EINVAL on unmount - if the mount point no longer
exists our job is done.
Fixes: #4247
Fixes: #4248
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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When we fail to remove a container's SHM, that's an error, and we
need to report it as such. This may be part of our lingering
storage woes.
Also, remove MNT_DETACH. It may be another cause of the storage
removal failures.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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When volume options and the local volume driver are specified,
the volume is intended to be mounted using the 'mount' command.
Supported options will be used to volume the volume before the
first container using it starts, and unmount the volume after the
last container using it dies.
This should work for any local filesystem, though at present I've
only tested with tmpfs and btrfs.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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This will require a 'podman system renumber' after being applied
to get lock numbers for existing volumes.
Add the DB backend code for rewriting volume configs and use it
for updating lock numbers as part of 'system renumber'.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Begin to separate the internal structures and frontend for
inspect on volumes. We can't rely on keeping internal data
structures for external presentation - separating presentation
and internal data format is good practice.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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the compilation demands of having libpod in main is a burden for the
remote client compilations. to combat this, we should move the use of
libpod structs, vars, constants, and functions into the adapter code
where it will only be compiled by the local client.
this should result in cleaner code organization and smaller binaries. it
should also help if we ever need to compile the remote client on
non-Linux operating systems natively (not cross-compiled).
Signed-off-by: baude <bbaude@redhat.com>
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Instead of rewriting the logic, reuse the standard logic we use
for removing containers, which is much better tested.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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The Commit test is blatantly wrong and testing buggy behavior. We
should be commiting the destination, if anything - and more
likely nothing at all.
When force-removing volumes, don't remove the volumes of
containers we need to remove. This can lead to a chicken and the
egg problem where the container removes the volume before we can.
When we re-add volume locks this could lead to deadlocks. I don't
really want to deal with this, and this doesn't seem a
particularly harmful quirk, so we'll let this slide until we get
a bug report.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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This swaps the previous handling (parse all volume mounts on the
container and look for ones that might refer to named volumes)
for the new, explicit named volume lists stored per-container.
It also deprecates force-removing volumes that are in use. I
don't know how we want to handle this yet, but leaving containers
that depend on a volume that no longer exists is definitely not
correct.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Before, there were SELinux denials when a volume was bind-mounted by podman play kube.
Partially fix this by setting the default private label for mounts created by play kube (with DirectoryOrCreate)
For volumes mounted as Directory, the user will have to set their own SELinux permissions on the mount point
also remove left over debugging print statement
Signed-off-by: Peter Hunt <pehunt@redhat.com>
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In lipod, we now log major events that occurr. These events
can be displayed using the `podman events` command. Each
event contains:
* Type (container, image, volume, pod...)
* Status (create, rm, stop, kill, ....)
* Timestamp in RFC3339Nano format
* Name (if applicable)
* Image (if applicable)
The format of the event and the varlink endpoint are to not
be considered stable until cockpit has done its enablement.
Signed-off-by: baude <bbaude@redhat.com>
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I was looking into why we have locks in volumes, and I'm fairly
convinced they're unnecessary.
We don't have a state whose accesses we need to guard with locks
and syncs. The only real purpose for the lock was to prevent
concurrent removal of the same volume.
Looking at the code, concurrent removal ought to be fine with a
bit of reordering - one or the other might fail, but we will
successfully evict the volume from the state.
Also, remove the 'prune' bool from RemoveVolume. None of our
other API functions accept it, and it only served to toggle off
more verbose error messages.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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Remove runtime's lockDir as it is no longer needed after the lock
rework.
Add a trivial in-memory lock manager for unit testing
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
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Add support for podman volume and its subcommands.
The commands supported are:
podman volume create
podman volume inspect
podman volume ls
podman volume rm
podman volume prune
This is a tool to manage volumes used by podman. For now it only handle
named volumes, but eventually it will handle all volumes used by podman.
Signed-off-by: umohnani8 <umohnani@redhat.com>
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