Batch contexts

This page describes contexts the Batch workflow can use in expressions for calculating YAML attribute values.
Batch Contexts
Context name
Description
flow
Information about the main workflow settings, defaults, etc. See flow context for details.
project
Information about the project. See project context for details.
params
A mapping of global workflow parameters. For more information, see params context.​
env
Contains environment variables set in workflow defaults. For more information, see env context .
tags
A set of job tags set in workflow defaults. See tags context for details.
volumes
Contains a mapping of volume definitions. For more information, see volumes context.
images
Contains a mapping of docker images from workflow config. See images context for details.
strategy
Contains information about strategies from flow defaults. See strategy context for details.
matrix
Contains combination data generated by the tasks.strategy.matrix. See matrix context for details.
needs
Contains outputs generated by tasks from tasks.needs. See needs context for details.
flow context
The flowcontext contains information about the workflow: its ID, title, etc.
Property name
Type
Description
flow.flow_id
str
The workflow's ID. It is automatically generated based on the workflow's YAML filename with a dropped suffix. You can override the property by setting the flow.id attribute.
flow.project_id
str
The project's ID. It is automatically generated based on the name of the project folder. You can override it using project.id attribute. Check the project configuration for details.
flow.workspace
LocalPath
A path to the workspace (the root folder of the project).
flow.title
str
The workflow's title. Set the flow.title attribute to override the auto-calculated value.
project context
The projectcontext contains information about the project: its ID, owner, etc.
Property name
Type
Description
project.id
str
The project's ID. It is automatically generated based on the name of the project folder. You can override it using project.id attribute. Check the project configuration for details. This context property is an alias to flow.project_id .
project.owner
str
The project's owner. See also: the project configuration.
project.role
str
The project's role. Set the project.role attribute to override the auto-calculated value.
params context
Parameter described in the params attribute .
Property name
Type
Description
params.<param-name>
str
The value of a specific parameter.
env context
The env context contains environment variables that have been set in the workflow defaults. For more information about setting environment variables in your workflow, see "Batch workflow syntax."
The env context syntax allows you to use the value of an environment variable in your workflow file. If you want to use the value of an environment variable inside a job, use your operating system's standard method for reading environment variables.
Property name
Type
Description
env.<env-name>
str
The value of a specific environment variable.
tags context
A set of job tags.
Tags available in this context are combined from system tags (project:<project-id>, flow:<flow-id>, task:<task-id>), and flow default tags (see defaults.tags attribute).
Property name
Type
Description
tags
set[str]
This context changes for each job. You can access this context from any job.
volumes context
Contains information about volumes defined in the volumes section  of a batch workflow.
Property name
Type
Description
volumes.<volume-id>.id
str
The volume definition identifier. For more information, see volumes.<volume-id> section.
volumes.<volume-id>.remote
URL
Remote volume URI, e.g. storage:path/to.
For more information, see volumes.<volume-id>.remote attribute.
volumes.<volume-id>.mount
RemotePath
The path inside a job by which the volume should be mounted.
For more information, see volumes.<volume-id>.mount attribute.
volumes.<volume-id>.read_only
bool
True if the volume is mounted in read-only mode, False otherwise.
For more information, see volumes.<volume-id>.read_only attribute.
volumes.<volume-id>.local
 None
In batch workflows, this property is always None.
volumes.<volume-id>.full_local_path
LocalPath or None
Full version of local property.
volumes.<volume-id>.ref
str
A volume reference that can be used as a task.volumes item. The calculated value looks like storage:path/to:/mnt/path:rw.
The value is assembled from the remote, mount, and read_only properties.
volumes.<volume-id>.ref_ro
str
Like ref but read-only mode is enforced.
volumes.<volume-id>.ref_rw
str
Like ref but read-write mode is enforced.
images context
Contains information about images defined in the images section of a batch workflow.
Property name
Type
Description
images.<image-id>.id
str
The image definition identifier. For more information, see images.<image-id> section.
images.<image-id>.ref
str
The image reference. For more information, see images.<image-id>.ref attribute.
images.<image-id>.context
None
In batch workflows, this property is always None.
images.<image-id>.full_context_path
None
In batch workflows, this property is always None.
images.<image-id>.dockerfile
None
In batch workflows, this property is always None.
images.<image-id>.full_dockerfile_path
None
In batch workflows, this property is always None.
images.<image-id>.build_args
list[str]
In batch workflows, this property is always [](empty list).
images.<image-id>.env
dict[str, str]
In batch workflows, this property is always {}(empty dict).
images.<image-id>.volumes
list[str]
In batch workflows, this property is always [](empty list).
strategy context
Contains information about some strategies of execution set in the flow defaults.
Property name
Type
Description
strategy.fail_fast
bool
Task failure processing strategy. For more information, see defaults.fail_fast attribute.
strategy.max_parallel
int
The maximum number of tasks that can be executed at the same time. For more information, see defaults.max_parallel attribute.
matrix context
Contains parameters from a combination generated by the tasks.strategy.matrix attribute.
Property name
Type
Description
matrix.<param-name>
bool or int or float or str or None
The matrix parameter value for the current combination.
needs context
Contains outputs generated by tasks that were specified in the tasks.needs attribute. Refer to the set-output command reference to learn how to generate outputs.
Property name
Type
Description
needs.<task-id>.result
str
State of the completed task <task-id>. Can be one of the following: "succedded", "failed", "cancelled", "skipped".
needs.<task-id>.outputs.<output-name>
str
The value of the <output-name> output produced by the <task-id> task.