Timeout when installing GHC

[nmattia]

Describe the bug

I'm seeing timeouts when installing the GHC bindist with rules_haskell:

ERROR: An error occurred during the fetch of repository 'rules_haskell_ghc_linux_amd64':
   Traceback (most recent call last):
	File "/var/tmp/bazel-output/external/rules_haskell/haskell/ghc_bindist.bzl", line 192, column 31, in _ghc_bindist_impl
		execute_or_fail_loudly(
	File "/var/tmp/bazel-output/external/rules_haskell/haskell/private/workspace_utils.bzl", line 25, column 13, in execute_or_fail_loudly
		fail("\n".join(["Command failed: " + " ".join(arguments), exec_result.stderr]))
Error in fail: Command failed: make install -f relocatable.mk
Timed out

For now I'm patching the rules to bump the execute timeout to 3 times the default (3 * 600 seconds). The command is installing (copying) several Gigabytes of data and it seems to take longer than ten minutes on machines with slow IO.

diff --git a/haskell/private/workspace_utils.bzl b/haskell/private/workspace_utils.bzl
index df851329..980b3e16 100644
--- a/haskell/private/workspace_utils.bzl
+++ b/haskell/private/workspace_utils.bzl
@@ -19,6 +19,8 @@ def execute_or_fail_loudly(
         environment = environment,
         quiet = True,
         working_directory = working_directory,
+        # triple the default timeout because e.g. copying GHC is slow (1.5G)
+        timeout = 3 * 600,
     )
     if exec_result.return_code != 0:
         arguments = [_as_string(x) for x in arguments]

Would it make sense to add timeout as an argument to execute_or_fail_loudly and specify a greater timeout in the make install call? Or is there a reason why it would get completely stuck and throw a timeout error? Unfortunately I have not managed to reproduce this reliably and can't confirm that increasing the timeout fixes the issue for good (i.e. can't rule out there's another cause beyond GHC being absurdly large)

Environment

• OS name + version: Linux, Ubuntu Focal 20.04.6 LTS
• Bazel version: 7.3.1
• Version of the rules: 1.0