can you fix the conflict and rebase onto main? · Entire

What happened

The rebase of soph/http-stale-pool-fix (8 commits) onto origin/main conflicted in go.mod and go.sum — both on the go-git version line:

• main had bumped to the tagged release v6.0.0-alpha.4 (via the dependabot PR #60 merge).
• my branch pinned the pseudo-version v6.0.0-alpha.4.0.20260521151600-590487407c38.

I kept the pseudo-version, because the pseudo-version's alpha.4.0.<ts>-<commit> form means its commit (go-git PR #2142, which adds WithObjectSelector) lands after the alpha.4 tag. The streaming-push code in internal/gitproto/push.go calls WithObjectSelector, so the tagged alpha.4 wouldn't compile — confirmed by the commit message ("Will switch to a tagged release once one is cut").

Verification

• No conflict markers remain
• go build ./... → OK
• go test ./internal/gitproto/ → ok

Notes

• Your uncommitted .entire/.gitignore change was stashed during the rebase and restored afterward — it's back in the working tree, unstaged, exactly as before. .clawpatch/ is still untracked.
• The branch now sits on top of main at 53a216b8. It's diverged from origin/soph/http-stale-pool-fix (the 8 commits got new SHAs), so updating the remote will need a force-push — I didn't push since you didn't ask. Want me to git push --force-with-lease?

Both comments are still relevant — one strongly, one arguably

1. "Cancel masked as HTTP 401" (auth.go) — ✅ still valid

The interface was extended since the review: Lookup now returns an err, and tryHelperRetry does propagate it (smarthttp.go:451-455 returns the error instead of falling through). So the plumbing to fix this now exists — but the implementation still doesn't use it:

output, helperErr := GitCredentialCommand(ctx, CredentialOpFill, input)
if helperErr != nil {
    return "", "", false, nil //nolint:nilerr // helper failure means "no credentials available"
}

GitCredentialCommand runs via exec.CommandContext(ctx, …), so a cancelled/timed-out context kills the subprocess and returns an error — which line 111 blanket-swallows into ok=false, err=nil. The //nolint:unparam // err is always nil today on line 100 confirms it's never populated. Net effect is exactly what the bot described: a cancel/timeout during git credential fill surfaces as the original HTTP 401 rather than context.Canceled/DeadlineExceeded.

Fix is now small and localized to Lookup: when helperErr != nil && ctx.Err() != nil, return ctx.Err() instead of swallowing.

2. "Premature credential helper approve" (smarthttp.go) — ⚠️ structurally still present, but low severity

The logic moved into tryHelperRetry (smarthttp.go:471-473) and the new probe path resolvePendingHelperCreds (:399-407). Both still call Approve + set c.Auth on any 2xx — and in RequestInfoRefs that runs at lines 199-205, beforehttpError (208), the content-type check (219-221), and the size-limit check (236-238). So a 2xx with the wrong content-type/oversized body still persists credentials while RequestInfoRefs returns an error.

My take, for nodo's "I think this is valid right?": it's real but low severity, and I'd push back slightly on the "leak" framing:

• A 2xx means the server actually authenticated the credentials — they're valid for that host, so storing them is correct and matches git (git approves at the HTTP-transport layer before parsing the protocol body).
• The credentials being approved are the same ones the helper just returned, so there's no new secret being persisted.
• The content-type/size failures are protocol-level, not auth-level.

If you want strict "approve only on a fully-validated success," the fix is to move resolvePendingHelperCreds

• the tryHelperRetry approval to after the content-type and size checks. Defensible hardening, but not a security bug.

Recommendation: Fix #1 (it's a genuine, now-easy diagnostics bug). For #2, either resolve the thread with a note that 2xx == auth-success-by-design, or do the small reorder if you prefer strictness.

Want me to make either change? Note this is the soph/issue-63-deferred-credential-helper branch (PR #65), not the one currently checked out (soph/http-stale-pool-fix), so I'd need to switch branches or use a worktree first.

Branch is ready: 9 commits ahead of the old remote (8 rebased + 1 new fix), 8 behind because of the SHA changes from the rebase. Want me to git push --force-with-lease?

Summary of what's in the new commit (5ec540df)

Root cause: Go's http.Client.shouldCopyHeaderOnRedirect strips Authorization on cross-host redirects, so when an origin redirected to a challenger, our retry-against-c.EndpointURL replayed through the same redirect and arrived at the challenger naked — got 401 — and we Reject'd the user's valid creds.

Two code paths fixed:

1. tryHelperRetry — captures res.Request.URL (the actually-challenged URL after redirects) and passes it as an override target to the retry callback. The retry hits the challenger directly, no redirect, auth intact.
2. EnsureAuthForService — probe-then-Lookup-against-challengeURL (previously Lookup-then-probe-then-key-on-something-else, which led to Approve/Reject hitting a key the helper has no entry for). Drops the pre-probe Lookup optimization — necessary trade-off since the user may have creds for the challenger and not for the origin.

Signature changes: doInfoRefsRequest and doPostRPCRequest gained an optional target *url.URL; nil = old behaviour.

Tests added:

• TestRequestInfoRefs_OnUnauthorizedAfterCrossHostRedirectRetriesAgainstChallenger — drives the full production flow with a real 307→401 chain, asserts the retry actually arrives at the challenger with Basic auth, Approve fires keyed correctly, no Reject, and c.EndpointURL adopts the challenger.
• TestEnsureAuthForService_CrossHostProbeLooksUpAndAdoptsChallenger — same idea on the probe path.

Test update: TestRun_Replicate_SubcommandExecutesAgainstEmptyTarget now expects 2 receive-pack POSTs (probe + real) since the probe is unconditional; TestMain comment in cmd/git-sync updated.

Summary of what changed

1. No more EndpointURL mutation. A new c.resolvedEndpoint field carries the post-redirect scheme/host when one's been discovered; c.EndpointURL stays exactly as the caller passed it in. URL-building reads c.requestURL(), which returns resolvedEndpoint when set and EndpointURL otherwise. The user-typed URL is now stable for display, logging, telemetry, the SSH-scheme check in refs.go, and the github.com check in bootstrap.go — none of which want the resolved value.