Stacked PRs with branches across forks

[chris-oo]

For most OSS projects including the ones I manage, branches don't live in the upstream repo and instead in forks that contributors submit as a PR back into the upstream repo. The FAQ mentions this isn't currently supported, but is this on the roadmap? I'm excited to use stacked PRs but unfortunately without this it's not very useful yet.

[liggitt]

+1, I was super-excited to try out the stacked workflow with something like etcd-io/etcd#21261, breaking that apart into a stack ... pushing to my personal fork worked great (https://github.com/liggitt/etcd/branches/all?query=protoc-stack&lastTab=overview), but it looks like the PR-opening doesn't yet work. Is the limitation only on the gh client side, and if so, is there a manual workaround to get the PRs opened to try out the server-side review workflows in the meantime?

When I tried submitting the stack just within my own fork anyway just to try out the PR flow, gh stack submit returned odd errors I'm not sure how to resolve

$ gh stack submit
? Multiple remotes found. Which remote should be used? origin
Pushing 13 branches to origin...
? Title for PR (branch protoc-stack/nil-safe): cleanup: use nil-safe getters
⚠ failed to create PR for protoc-stack/nil-safe: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between main and protoc-stack/nil-safe, Head ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/protocmp.Transform): test: use protocmp.Transform
⚠ failed to create PR for protoc-stack/protocmp.Transform: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/nil-safe and protoc-stack/protocmp.Transform, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/vet-errorf): vet: fix error message construction
⚠ failed to create PR for protoc-stack/vet-errorf: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/protocmp.Transform and protoc-stack/vet-errorf, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/messages-pointer): internal: pass messages by pointer
⚠ failed to create PR for protoc-stack/messages-pointer: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/vet-errorf and protoc-stack/messages-pointer, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/clone): internal: clone messages instead of shallow copy
⚠ failed to create PR for protoc-stack/clone: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/messages-pointer and protoc-stack/clone, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/mvccpb.Event): client: stop wrapping mvccpb.Event type
⚠ failed to create PR for protoc-stack/mvccpb.Event: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/clone and protoc-stack/mvccpb.Event, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/authpb.UserAddOptions): client: stop wrapping authpb.UserAddOptions type
⚠ failed to create PR for protoc-stack/authpb.UserAddOptions: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/mvccpb.Event and protoc-stack/authpb.UserAddOptions, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/client-pointers): client: stop passing proto by value
⚠ failed to create PR for protoc-stack/client-pointers: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/authpb.UserAddOptions and protoc-stack/client-pointers, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/client-Cmp-pointers): client: fix Cmp proto pass by value
⚠ failed to create PR for protoc-stack/client-Cmp-pointers: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/client-pointers and protoc-stack/client-Cmp-pointers, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/server-Snapshot-pointers): server: stop passing Snapshot by value
⚠ failed to create PR for protoc-stack/server-Snapshot-pointers: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/client-Cmp-pointers and protoc-stack/server-Snapshot-pointers, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/server-mvccpb.KeyValue-pointer): server: stop passing mvccpb.KeyValue by value
⚠ failed to create PR for protoc-stack/server-mvccpb.KeyValue-pointer: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/server-Snapshot-pointers and protoc-stack/server-mvccpb.KeyValue-pointer, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/etcdctl-pointers): etcdctl: stop passing proto by value
⚠ failed to create PR for protoc-stack/etcdctl-pointers: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/server-mvccpb.KeyValue-pointer and protoc-stack/etcdctl-pointers, Head ref must be a branch, Base ref must be a branch (createPullRequest)
? Title for PR (branch protoc-stack/drop-gogo): protoc stack/drop gogo
⚠ failed to create PR for protoc-stack/drop-gogo: creating PR: GraphQL: Head sha can't be blank, Base sha can't be blank, No commits between protoc-stack/etcdctl-pointers and protoc-stack/drop-gogo, Head ref must be a branch, Base ref must be a branch (createPullRequest)
✓ Pushed and synced 13 branches