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docs: Add note about oras behavior #6942

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6 changes: 6 additions & 0 deletions docs/reference/env-vars.md
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Expand Up @@ -218,11 +218,17 @@ The following environment variables control the configuration of the Nextflow ru

`NXF_SINGULARITY_CACHEDIR`
: Directory where remote Singularity images are stored. When using a computing cluster it must be a shared folder accessible from all compute nodes.
: :::note
The `NXF_SINGULARITY_CACHEDIR` variable is not applied when a container image is specified using an `oras://` URI. In that case, the image reference is passed directly to Singularity, independently of Nextflow's caching mechanism.
:::

`NXF_SINGULARITY_LIBRARYDIR`
: :::{versionadded} 21.09.0-edge
:::
: Directory where remote Singularity images are retrieved. It should be a directory accessible to all compute nodes.
: :::note
The `NXF_SINGULARITY_LIBRARYDIR` variable is not applied when a container image is specified using an `oras://` URI. In that case, the image reference is passed directly to Singularity, independently of Nextflow's caching mechanism.
:::

`NXF_SPACK_CACHEDIR`
: Directory where Spack environments are stored. When using a computing cluster it must be a shared folder accessible from all compute nodes.
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