For every Label
instance
l
, the string representation str(l)
has the property that Label(str(l)) == l
, regardless of where the Label()
call occurs.
Members
Label
Label Label(input)
Label
object, in the context of the package where the calling .bzl
source file lives. If the given value is already a Label
, it is returned unchanged.For macros, a related function, native.package_relative_label()
, converts the input into a Label
in the context of the package currently being constructed. Use that function to mimic the string-to-label conversion that is automatically done by label-valued rule attributes.
Parameters
Parameter | Description |
---|---|
input
|
string; or Label ;
requiredThe input label string or Label object. If a Label object is passed, it's returned as is. |
name
string Label.nameThe name of the target referred to by this label. For instance:
Label("@@foo//pkg/foo:abc").name == "abc"
package
string Label.packageThe name of the package containing the target referred to by this label, without the repository name. For instance:
Label("@@repo//pkg/foo:abc").package == "pkg/foo"
relative
Label Label.relative(relName)Experimental. This API is experimental and may change at any time. Please do not depend on it. It may be enabled on an experimental basis by setting
--+incompatible_enable_deprecated_label_apis
Deprecated. This method behaves surprisingly when used with an argument containing an apparent repo name. Prefer
Label.same_package_label()
, native.package_relative_label()
, or Label()
instead.Resolves a label that is either absolute (starts with //
) or relative to the current package. If this label is in a remote repository, the argument will be resolved relative to that repository. If the argument contains a repository name, the current label is ignored and the argument is returned as-is, except that the repository name is rewritten if it is in the current repository mapping. Reserved labels will also be returned as-is.
For example:
Label("//foo/bar:baz").relative(":quux") == Label("//foo/bar:quux") Label("//foo/bar:baz").relative("//wiz:quux") == Label("//wiz:quux") Label("@repo//foo/bar:baz").relative("//wiz:quux") == Label("@repo//wiz:quux") Label("@repo//foo/bar:baz").relative("//visibility:public") == Label("//visibility:public") Label("@repo//foo/bar:baz").relative("@other//wiz:quux") == Label("@other//wiz:quux")
If the repository mapping passed in is {'@other' : '@remapped'}
, then the following remapping will take place:
Label("@repo//foo/bar:baz").relative("@other//wiz:quux") == Label("@remapped//wiz:quux")
Parameters
Parameter | Description |
---|---|
relName
|
required The label that will be resolved relative to this one. |
repo_name
string Label.repo_nameThe canonical name of the repository containing the target referred to by this label, without any leading at-signs (
@
). For instance, Label("@@foo//bar:baz").repo_name == "foo"
same_package_label
Label Label.same_package_label(target_name)Creates a label in the same package as this label with the given target name.
Parameters
Parameter | Description |
---|---|
target_name
|
required The target name of the new label. |
workspace_name
string Label.workspace_nameExperimental. This API is experimental and may change at any time. Please do not depend on it. It may be enabled on an experimental basis by setting
--+incompatible_enable_deprecated_label_apis
Deprecated. The field name "workspace name" is a misnomer here; use the identically-behaving
Label.repo_name
instead.The canonical name of the repository containing the target referred to by this label, without any leading at-signs (@
). For instance,
Label("@@foo//bar:baz").workspace_name == "foo"
workspace_root
string Label.workspace_rootReturns the execution root for the repository containing the target referred to by this label, relative to the execroot. For instance:
Label("@repo//pkg/foo:abc").workspace_root == "external/repo"