go_modules update fails with local replaces

[sysradium]

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Package ecosystem

go

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Manifest location and content before the Dependabot update

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What you expected to see, versus what you actually saw

We have a following line in go.mod:

replace protogo v0.0.0-replace => ../../../dev/protodev/proto/protogo

• dependabot detects local replace and stubs it out with a folder 1c61b09cbe7c268a16b568954aff06d86f959ba8578b6f0e1c9afe5dd14e0489 and 2 empty files go.mod and main.go

• executes go get for each dependency

• executes go get without any parameters (https://github.com/dependabot/dependabot-core/blob/v0.225.0/go_modules/lib/dependabot/go_modules/file_updater/go_mod_updater.rb#L122C1-L122C1)

That go get fails with:

protogo/lead/legacy: package protogo/lead/legacy is not in GOROOT (/opt/go/src/protogo/lead/legacy)

I guess because stubbed does not contain any structure.

Commenting that line fixed the problem:

dependabot-core on  main [!] on 🐳 v24.0.2
➜ git diff

b/go_modules/lib/dependabot/go_modules/file_updater/go_mod_updater.rb
index 50c1883ec..18c535917 100644
--- a/go_modules/lib/dependabot/go_modules/file_updater/go_mod_updater.rb
+++ b/go_modules/lib/dependabot/go_modules/file_updater/go_mod_updater.rb
@@ -119,7 +119,7 @@ module Dependabot
             # Run `go get`'s internal validation checks against _each_ module in `go.mod`
             # by running `go get` w/o specifying any library. It finds problems like when a
             # module declares itself using a different name than specified in our `go.mod` etc.
-            run_go_get
+            # run_go_get

             # If we stubbed modules, don't run `go mod {tidy,vendor}` as
             # dependencies are incomplete

dependabot-core on  main [!] on 🐳 v24.0.2
➜ script/build go_modules
....

dependabot-core on  main [!] on 🐳 v24.0.2
➜  /usr/local/bin/dependabot update go_modules  -d /src  --updater-image=ghcr.io/dependabot/dependabot-updater-gomod:latest --pull=false our_company/our_repo

...
  proxy | 2023/08/04 12:36:18 [426] 200 http://host.docker.internal:57063/update_jobs/cli/mark_as_processed
updater | 2023/08/04 12:36:18 INFO Finished job processing
updater | 2023/08/04 12:36:18 INFO Results:
updater | +-------------------------------------------------------------------------------------------------------+
updater | |                                  Changes to Dependabot Pull Requests                                  |
updater | +---------+---------------------------------------------------------------------------------------------+
....

Maybe we should not execute go get if ANY local replaces were detected? I.e.:

# Bump the deps we want to upgrade using `go get lib@version`
run_go_get(dependencies)

# Run `go get`'s internal validation checks against _each_ module in `go.mod`
# by running `go get` w/o specifying any library. It finds problems like when a
# module declares itself using a different name than specified in our `go.mod` etc.
if substitutions.empty?
  run_go_get

# If we stubbed modules, don't run `go mod {tidy,vendor}` as
# dependencies are incomplete
if substitutions.empty?
  # go mod tidy should run before go mod vendor to ensure any
  # dependencies removed by go mod tidy are also removed from vendors.
  run_go_mod_tidy
  run_go_vendor
else
  substitute_all(substitutions.invert)
end

Native package manager behavior

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