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Support defining multiple stackage snapshots in module extension #1960

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avdv opened this issue Sep 15, 2023 · 1 comment
Open

Support defining multiple stackage snapshots in module extension #1960

avdv opened this issue Sep 15, 2023 · 1 comment
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P3 minor: not priorized

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avdv commented Sep 15, 2023 •
edited

Currently, there is no way to configure a stack_snapshot other than the default "stackage" one in a MODULE.bazel file.

Adding an attribute to the configuration tags by which we are able to identify and configure different snapshots would make a MODULE.bazel file look like this:

stackage = use_extension("@rules_haskell//extension:stackage_snapshot.bzl", "stack_snapshot")

stackage.snapshot(name = "stackage", local_snapshot = ...)

stackage.snapshot(name = "other-snapshot", local_snapshot = ...)

stackage.package(name = "vector") # default snapshot
stackage.package(name = "vector", snapshot = "stackage") # equivalent to the above

stackage.package(name = "megaparsec", snapshot = "other-snapshot")

use_repo(
  stackage,
  "stackage",
  "stackage-exe",
  "other-snapshot",
  "other-snapshot-exe"
)
@avdv avdv mentioned this issue Sep 15, 2023
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@avdv avdv self-assigned this Sep 15, 2023
@avdv avdv changed the title Support to define multiple stackage snapshots in module extenson Support to define multiple stackage snapshots in module extension Sep 15, 2023
@avdv avdv changed the title Support to define multiple stackage snapshots in module extension Support defining multiple stackage snapshots in module extension Sep 15, 2023
avdv added a commit that referenced this issue Sep 15, 2023
@avdv
bzlmod: Support defining more than one stack snapshot
3f191b9 
Add a `name` to the stack_snapshot tag which can be referenced from other tags
of the extension using the `snapshot` attribute.

The tags are then grouped by the snapshot name, and a stack snapshot is created.
Only the first snapshot sets up the global stack tool repository.

Fixes #1960
@avdv avdv mentioned this issue Sep 15, 2023
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avdv commented Sep 20, 2023

Given that there is an experimental isolate argument for the use_extension function in Bazel >= 6.3.0 (under the --experimental_isolated_extension_usages flag) it seems that this would be a better mechanism to support this use case.

In the meantime (if you cannot / do not want to use isolate = True), define auxiliary stack snapshots in an extension implementation.

See https://bazel.build/rules/lib/globals/module#use_extension and bazelbuild/bazel#18529

@avdv avdv added the P3 minor: not priorized label Oct 16, 2023
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Allow using multiple stack snapshots in a MODULE.bazel tweag/rules_haskell
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