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Add structure for new exec session tracking to DB

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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>
This commit is contained in:
Matthew Heon
2020-02-04 16:56:07 -05:00
parent f138405b46
commit 118e78c5d6
19 changed files with 1430 additions and 489 deletions
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13
libpod/define/errors.go
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@ -20,6 +20,10 @@ var (
// ErrNoSuchVolume indicates the requested volume does not exist
ErrNoSuchVolume = errors.New("no such volume")
// ErrNoSuchExecSession indicates that the requested exec session does
// not exist.
ErrNoSuchExecSession = errors.New("no such exec session")
// ErrCtrExists indicates a container with the same name or ID already
// exists
ErrCtrExists = errors.New("container already exists")
@ -29,10 +33,16 @@ var (
ErrImageExists = errors.New("image already exists")
// ErrVolumeExists indicates a volume with the same name already exists
ErrVolumeExists = errors.New("volume already exists")
// ErrExecSessionExists indicates an exec session with the same ID
// already exists.
ErrExecSessionExists = errors.New("exec session already exists")
// ErrCtrStateInvalid indicates a container is in an improper state for
// the requested operation
ErrCtrStateInvalid = errors.New("container state improper")
// ErrExecSessionStateInvalid indicates that an exec session is in an
// improper state for the requested operation
ErrExecSessionStateInvalid = errors.New("exec session state improper")
// ErrVolumeBeingUsed indicates that a volume is being used by at least one container
ErrVolumeBeingUsed = errors.New("volume is being used")
@ -90,6 +100,9 @@ var (
// ErrVolumeRemoved indicates that the volume has already been removed and
// no further operations can be performed on it
ErrVolumeRemoved = errors.New("volume has already been removed")
// ErrExecSessionRemoved indicates that the exec session has already
// been removed and no further operations can be performed on it.
ErrExecSessionRemoved = errors.New("exec session has already been removed")
// ErrDBClosed indicates that the connection to the state database has
// already been closed