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Improve description of Running and Paused booleans

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Commit abd72d4008 added
a "FIXME" comment to the container "State", mentioning
that a container cannot be both "Running" and "Paused".

This comment was incorrect, because containers on
Linux actually _must_ be running in order to be
paused.

This patch adds additional information both in a
comment, and in the API documentation to clarify
that these booleans are not mutually exclusive.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2017-05-19 12:29:54 +02:00
parent ab83b924bc
commit b654b6244d
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GPG key ID: 76698F39D527CE8C
3 changed files with 19 additions and 5 deletions
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16
api/swagger.yaml
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@ -3107,10 +3107,22 @@ paths:
type: "object" type: "object"
properties: properties:
Status: Status:
description: "The status of the container. For example, `running` or `exited`." description: |
The status of the container. For example, `"running"` or `"exited"`.
type: "string" type: "string"
enum: ["created", "running", "paused", "restarting", "removing", "exited", "dead"]
Running: Running:
description: "Whether this container is running." description: |
Whether this container is running.
Note that a running container can be _paused_. The `Running` and `Paused`
booleans are not mutually exclusive:
When pausing a container (on Linux), the cgroups freezer is used to suspend
all processes in the container. Freezing the process requires the process to
be running. As a result, paused containers are both `Running` _and_ `Paused`.
Use the `Status` field instead to determin if a container's state is "running".
type: "boolean" type: "boolean"
Paused: Paused:
description: "Whether this container is paused." description: "Whether this container is paused."

2
api/types/types.go
View file

@ -277,7 +277,7 @@ type Health struct {
// ContainerState stores container's running state // ContainerState stores container's running state
// it's part of ContainerJSONBase and will return by "inspect" command // it's part of ContainerJSONBase and will return by "inspect" command
type ContainerState struct { type ContainerState struct {
Status string Status string // String representation of the container state. Can be one of "created", "running", "paused", "restarting", "removing", "exited", or "dead"
Running bool Running bool
Paused bool Paused bool
Restarting bool Restarting bool

6
container/state.go
View file

@ -17,8 +17,10 @@ import (
// functions defined against State to run against Container. // functions defined against State to run against Container.
type State struct { type State struct {
sync.Mutex sync.Mutex
// FIXME: Why do we have both paused and running if a // Note that `Running` and `Paused` are not mutually exclusive:
// container cannot be paused and running at the same time? // When pausing a container (on Linux), the cgroups freezer is used to suspend
// all processes in the container. Freezing the process requires the process to
// be running. As a result, paused containers are both `Running` _and_ `Paused`.
Running bool Running bool
Paused bool Paused bool
Restarting bool Restarting bool