feat(bootstrap): start etterminal over ssh and return session credentials - #3
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Config, the sentinel errors, and the throwaway XXX-prefixed id and passkey sent to etterminal, generated from crypto/rand.Text. Verified with go test -race, vet and golangci-lint on linux and windows.
TERM and the etterminal path are interpolated into a remote shell command, so both are checked against strict character sets; TERM also excludes '_', which etterminal uses as its stdin field separator (a TERM with '_' aborts etterminal on 7.0.0). A destination or user that ssh would read as an option, and a separate user combined with a destination that already names one, are rejected. Each ssh option is its own -o argument. Verified with the table tests, race detector and golangci-lint on linux and windows.
String, GoString and LogValue redact the passkey so it cannot reach fmt output, errors or slog by accident; the id stays visible for debugging. Verified through %v, %+v, %s, %#v, nested structs, Errorf and the slog JSON handler.
The first IDPASSKEY marker must be followed by exactly 16 and 32 alphanumeric characters; shell noise before it is ignored and malformed values are rejected without quoting passkey material. Verified with a table test covering noise, CRLF, truncation, wrong lengths and non-alphanumeric input.
Run executes ssh with inherited stdin and stderr so prompts work, captures stdout (capped at 1 MiB), cancels with interrupt then kill plus a WaitDelay, and ignores ssh's exit status when credentials arrive because etterminal daemonises. Failures produce one error with the exit status, a hint for 127 (etterminal missing) and 255 (ssh failed) and an excerpt cut before any passkey material. A server that does not regenerate the id triggers a logged warning. Tests fake ssh by re-executing the test binary, so they need no shell scripts. Verified with go test -race, vet and golangci-lint on linux and windows, and by hand against a local etserver 7.0.0 over ssh (success, missing etterminal, failed authentication).
Credentials redacted only through String, GoString and LogValue, so %d, %t and %o, encoding/json, encoding/xml and slog JSON or text of a struct or slice holding Credentials all printed the passkey. Format (fmt.Formatter) now covers every verb, MarshalJSON and MarshalText cover the encoders, and the redaction text is REDACTED to match protocol and seal. The doc names the renderings no method can reach: an unexported struct field, %p on a value, and encoding/gob. Verified with a rendering matrix test (fmt verbs, pointer, nested, slice, map, Errorf, json, xml, slog JSON and text), and by mutating Format, MarshalJSON and MarshalText to print the passkey, each of which turned the test red.
Mutation runs showed production lines whose removal left every test green: the no-regeneration warning guard, the interrupt-first cmd.Cancel, cmd.WaitDelay, the ssh found on PATH, the parse bounds and slash guards, control-character validation, the excerpt keeping the tail, the per-status hints and the malformed-passkey message. Each now has an assertion that fails without it. The cancel test is Unix only: the fake ssh traps os.Interrupt, records it, and opens a FIFO once its handler is installed, so the test cancels without sleeping and proves both the interrupt and the WaitDelay kill. Verified by mutating each pinned line and watching its test fail on an assertion.
When ssh exited 0 without credentials while a descendant still held its stdout, exec returned ErrWaitDelay and Run reported a start failure with no exit status, hint or output excerpt. ErrWaitDelay only follows a successful exit, so it now goes to the same missing-credentials report as any other status-0 run. Verified with a fake ssh that exits 0 while a grandchild keeps writing to the inherited stdout; the test failed with the start-failure error before the fix and passes after it.
Drop pointers to private design documents, name upstream's genCommand correctly, say that a marker past the output cap is lost, describe the excerpt length exactly, state that the terminal path admits a tilde on purpose, note that the first marker wins as in the upstream client, and say the no-regeneration warning applies to the command line on both hosts. The two character checks use strings.ContainsFunc. Verified with vet, golangci-lint on linux and windows, and go test -race.
Format, the marshalers and LogValue could not reach three renderings: fmt of a Credentials held in an unexported struct field, %p on a value, and encoding/gob. Each printed the passkey. The passkey now sits behind an unexported *string, read with Passkey() and set with NewCredentials, so reflection sees only an address and the encoders skip it. %#v quotes the id, and the doc says to hold Credentials in a named field because embedding promotes Format and the marshalers. Verified with the rendering matrix extended to the three bypasses, a LogValue kind check and a %#v row with a quote in the id; turning the field back into a plain string, renaming LogValue, dropping the quoting or breaking Passkey() each turns a test red.
No test reached the no-regeneration warning with a nil Logger, so removing the discard default would have shipped a nil pointer panic for callers that leave Logger unset. The new test runs that path with a nil Logger; removing the default makes it fail with a message instead of passing.
…ions waitDelay also bounds the wait for ssh's stdout to close after ssh exits, which the ErrWaitDelay branch relies on; the comment now says so. The two TerminalMain.cpp line citations name et-v7.0.0, since upstream master has moved. The exit1 failure row now requires the message to end with its status, because "status 1" also matched "status 127". Verified with vet, golangci-lint on linux and windows and go test -race.
The warning test compared the log against the passkey returned by the Credentials under test, and the parse table compared against Credentials built by the same constructor, so a broken accessor or constructor could make both sides agree or panic. Both now compare with values the code under test did not produce: the command line the fake ssh received, and the test constants. The fake's lingering child now outlasts waitDelay, so the linger row always goes through the ErrWaitDelay branch, and the Format doc says fmt handles %T and %p itself. Verified by making NewCredentials drop the passkey (both tests fail on assertions) and by raising waitDelay to 10s (the linger row still reaches ErrWaitDelay).
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WalkthroughThe new ChangesTerminal Bootstrap
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Run
participant SSH
participant parseCredentials
Run->>SSH: Start remote terminal command
SSH-->>Run: Return captured stdout and exit status
Run->>parseCredentials: Parse captured stdout
parseCredentials-->>Run: Return Credentials or parsing error
Merge Risk: 🔵 Low · up to Canceling startup after SSH prints credentials can still report success. The issue is bounded but should be fixed so cancellation reliably returns an error. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 35.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 37 functions across 11 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Inline comments:
In `@internal/bootstrap/bootstrap.go`:
- Around line 65-112: Update the credential-success path after cmd.Run and
parseCredentials so parsed credentials are returned only when ctx.Err() is nil;
when cancellation occurred, return the existing cancellation error instead, even
if SSH produced a complete credential record. Preserve the existing behavior
that accepts credentials after a nonzero SSH exit when the context was not
canceled.
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📒 Files selected for processing (12)
AGENTS.mdinternal/bootstrap/bootstrap.gointernal/bootstrap/bootstrap_test.gointernal/bootstrap/bootstrap_unix_test.gointernal/bootstrap/command.gointernal/bootstrap/command_test.gointernal/bootstrap/credentials.gointernal/bootstrap/credentials_test.gointernal/bootstrap/parse.gointernal/bootstrap/parse_test.gointernal/bootstrap/placeholder.gointernal/bootstrap/placeholder_test.go
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Copilot review overview
🟡 Changes recommended
Error excerpts can expose the generated passkey before an IDPASSKEY: marker.
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What changed in this PR
Adds internal/bootstrap to launch etterminal over SSH, parse session credentials, handle cancellation, and redact passkeys.
Changes:
- Adds validated SSH command construction and placeholder generation.
- Adds credential parsing, redaction, and safe error handling.
- Adds comprehensive cross-platform and process-handling tests.
A critical passkey-redaction issue remains in bootstrap.go.
| File | Description |
|---|---|
internal/bootstrap/placeholder.go |
Generates throwaway credentials. |
internal/bootstrap/placeholder_test.go |
Tests placeholder generation. |
internal/bootstrap/parse.go |
Parses IDPASSKEY output. |
internal/bootstrap/parse_test.go |
Tests parsing and redaction errors. |
internal/bootstrap/credentials.go |
Implements credential redaction. |
internal/bootstrap/credentials_test.go |
Tests safe rendering and encoding. |
internal/bootstrap/command.go |
Validates configuration and builds SSH commands. |
internal/bootstrap/command_test.go |
Tests validation and arguments. |
internal/bootstrap/bootstrap.go |
Runs SSH and handles process outcomes. |
internal/bootstrap/bootstrap_unix_test.go |
Tests Unix cancellation behavior. |
internal/bootstrap/bootstrap_test.go |
Tests bootstrap success and failures. |
AGENTS.md |
Documents the new package. |
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…ure output Run returned credentials after the caller cancelled when ssh had already printed them, so a Ctrl+C during bootstrap could still go on to connect; a cancelled ctx now wins. The failure excerpt was cut only at the first IDPASSKEY marker, so a remote side echoing the command line before failing put the generated passkey into the error, and against a server that does not regenerate that is the session passkey. The output is now passed through redactSecret, which removes the passkey and every 8-byte piece of it, so a copy split across lines or cut short is removed too. Verified with fake ssh modes that print credentials and hang, and that echo the command and fail, plus a table test of redactSecret with exact expected output; reverting each fix, stepping the window loop by 4, or wiping the whole output each turns a test red.
…asskey Redacting 8-byte windows of the generated passkey still let a copy wrapped into shorter chunks reach the error excerpt, and no window size scrubs every split reliably. Output that contains any 4-byte piece of the passkey is now withheld as a whole, replaced by a note; the exit status and hints are still reported. Only output wrapped at 3 columns or fewer could slip past, and ordinary banners do not trigger it because the passkey is uppercase base32. Verified with TestContainsPiece (wrapped at 7 and at 4, unaligned and last pieces, shorter pieces, unrelated text) and the echoing fake ssh; making the check a no-op, or stepping its loop by 2 with a short bound, turns them red.
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Summary
Adds
internal/bootstrap, which starts a session the way the upstream client does: it runs the systemsshto executeecho '<id>/<passkey>_<TERM>' | etterminal --verbose=0on the server and returns the id and passkey etterminal prints on itsIDPASSKEY:line. Nothing calls it yet;cmd/etwires it in a later phase._, because etterminal splits its stdin on_and aborts otherwise (measured against etserver 7.0.0). A destination or user that ssh would read as an option, and a separate user combined with a destination that already names one, are rejected before ssh runs. Each ssh option is its own-oargument.XXX, so etterminal generates fresh credentials and the passkey in use never appears on either command line. If a server echoes the placeholder back anyway, Run logs a warning and continues, as the upstream client does.IDPASSKEY:marker must be followed by exactly 16 and 32 alphanumeric characters; banner and shell noise before it is ignored, and errors never quote passkey material.WaitDelay(Windows kills directly). ssh's exit status does not decide success, because etterminal daemonises after printing its credentials.--terminal-path) and 255 (ssh could not connect or authenticate), and a%qexcerpt of the output cut before any marker. A successful ssh whose stdout is held open by a descendant is reported as missing credentials rather than a start failure.Credentialskeeps the passkey behind an unexported pointer, read withPasskey()and built withNewCredentials, so reflection-based renderings see only an address.Format,MarshalJSON,MarshalTextandLogValueprint it asREDACTED, matchingprotocolandseal.Tests fake ssh by re-executing the test binary, so they need no shell scripts and run on Windows too. A Unix-only test synchronises with the fake through a FIFO to prove the interrupt arrives and the
WaitDelaykill ends a child that ignores it, without sleeping.Related Issues
None.
Test Plan
go build ./...,go vet ./...,go test ./... -raceGOOS=windows go vet ./...,CGO_ENABLED=0 GOOS=windows GOARCH=arm64 go build ./...,GOOS=darwin go vet ./...golangci-lint run ./...andGOOS=windows golangci-lint run ./...,go build -tags ruleguard ./rules/Summary by CodeRabbit