mirror of https://github.com/pulumi/pulumi.git
a244de9092
We previously changed how the Go language host retrieves information
about a Go module:
before: go list -m -json -mod=mod all
after: go list -m -json $importPath1 $importPath1
This change made it possible for us to supprot running in vendored mode
which allowed for use of private plugins that are not go-get-able.
This uncovered a corner case in the `go` command's behavior
when running in module mode:
If a package is listed in the go.mod
but it's not imported by the current module,
`go list -m -json $importPath` will not list its Dir in the output
even if it's present in the module cache.
For example, given a go.mod file that declares a dependency
but code that doesn't import it, as of Go 1.20.5,
export GOMODCACHE=$(mktemp -d)
go mod download -json
go list -m -json $importPath
The output of `go mod download` will include information
about the dependency and the `Dir` where it was downloaded,
but `go list -m` will not.
Unfortunately, we can't just use `go mod download`
because that breaks vendoring:
vendored dependencies cannot always be redownloaded.
To resolve this issue,
we switch to a two-pass variant to gather this information:
- Run `go list -m` to get whatever information we can locally.
This will be sufficient for the majority of use cases.
- For the handful of cases where the dependency isn't imported,
we'll use `go mod download -json` to download them on-demand
and get their location from that instead.
The `go mod download` step will take place only if we're in module mode.
In vendor mode, we'll work with what we have.
Resolves #13301
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