releasekit/docs/roadmap/remediation.md

# Host-native launcher review findings

Reviewed the implementation from `bf07bed` through `0269648` against the
[feature roadmap](host-native-launchers.md) and
[implementation plan](implementation.md).

The maintained launchers select the Go host before preparing and running the
tool. API-only recovery prepares its private module on the host; printed Go
handoffs discover the host again when run. The CLI retains the native fallback
and saved-record selection. Application build targets still come from the
profile, and the public Go facades and dependency boundaries are unchanged.

## Make the adoption smoke command runnable

**Completed.** The smoke command runs the saved launcher through `sh`; verified with a non-executable file and a foreign target.

**Evidence:** The [adoption guide](../consumers/adoption.md#cli-tool-dependency)
tells readers to save the launcher as `releasekit` and run
`./releasekit version`. A newly saved shell file ordinarily lacks its execute
bit. In a disposable directory, the documented command failed with status 126
and “Permission denied.” Invoking the same snippet through `sh` ran a
module-registered fixture tool on Linux/amd64 with inherited
`GOOS=windows GOARCH=arm64`.

**Fix:** Use `sh ./releasekit version` in the smoke instructions, or give an
explicit `chmod +x ./releasekit` step before direct execution. Verify the
published instructions from a newly created file under a foreign target.

## Limit the recovery guarantee to GOOS and GOARCH

**Completed.** The CLI reference names the two target variables and identifies the shell syntax.

**Evidence:** The [CLI contract](../cli.md) says Go handoffs select the host
“independently of inherited cross-compilation settings.” The
[command formatter](../../cmd/releasekit/main.go) overrides `GOOS` and
`GOARCH` and retains other build settings. For example, building the actual CLI
with the native target, `CGO_ENABLED=1`, and an unavailable C compiler named
by `CC` still fails in `runtime/cgo`. This is consistent with the roadmap's
scope, but the CLI wording implies broader independence.

**Fix:** Say that generated Go handoffs set `GOOS` and `GOARCH` from the
selected Go toolchain at invocation time. Preserve the other inherited settings
and the existing workspace and toolchain overrides. The documented handoff
uses POSIX shell syntax; identify that syntax when telling operators where to
paste the command.

## Exercise a profile target that differs from the launcher host

**Evidence:** The binary-delivery case in
[`TestMultiModuleWoodpeckerDelivery`](../../cmd/releasekit/multi_module_woodpecker_test.go)
supplies a foreign target to the workflow and checks the uploaded
`core-v2.1.0-linux-amd64` asset. The profile itself selects `linux/amd64`.
On the Linux/amd64 review host, the test cannot distinguish using the
profile target from accidentally using the normalized launcher target. The
current build code still applies the selected profile target explicitly.

**Fix:** In that fixture, select a supported profile target distinct from the
host and assert the uploaded asset matches it. Where practical, inspect the
uploaded executable header as well as the name, so the test catches a
host-built payload with a profile-derived filename. Keep the existing local
forge fixture and native version check; the cross-built asset need not run on
the host.

## Reconcile the feature roadmap with the completed implementation

**Evidence:** The [feature roadmap](host-native-launchers.md) still declares
“implementation pending” and describes the pre-change launchers as the current
baseline. All six stages in the [implementation plan](implementation.md) are
marked complete, and the maintained launchers and recovery code implement the
host selection described there.

**Fix:** Mark the roadmap implemented and label the old baseline as historical,
or retire the completed planning documents after review. Preserve the planned
release-note entry for the next selected release version.

## Verification

`go test ./...`, `go run ./internal/apicheck`, and syntax checks for the
maintained shell scripts passed. The Go suite exercised real tool preparation,
Woodpecker command blocks with local fixtures, and later execution of printed
recovery commands. Disposable smoke probes also verified the maintainer
launcher forwards the child status and the manual retry preserves the calling
shell's target variables. The review made no changes to production code or
tests.

## Integration audit

The audit below examines how the new bootstrap paths interact with existing
invocation recipes, product checks, and publication recovery.

### Use the external Go executable in printed recovery commands

**Evidence:** Before host normalization, the
[command formatter](../../cmd/releasekit/main.go) emitted
`env GOWORK=off GOTOOLCHAIN=local go ...`, which resolves Go through `PATH`.
[Recovery preparation](../../internal/gotool/recovery.go) still executes an
external Go command. The new printed command uses bare `go` for both host
queries and the later tool invocation, so a function named `go` in the
operator's shell can intercept it. In a local rejected-push fixture, the
actual printed command reconciled the saved record in an ordinary shell.
With `go() { GOOS=windows GOARCH=arm64 command go "$@"; }` defined, the same
command failed with an exec format error. The function overrode the final
assignments even though the host queries reported the correct host. In this
case both paths exited with status 1, but only one produced a reconciliation
result.

**Fix:** Restore external command lookup for the host queries and tool
invocation, for example by using `env go -C ...` throughout the subshell.
Keep selection through the operator's current `PATH`, including executable
shims, and keep the exact record and exit status. Exercise a generated
handoff from a POSIX shell that defines a cross-build Go function; assert
the reconciliation result as well as the status.

### Explain how host normalization affects configured product checks

**Evidence:** The updated launchers export `GOOS` and `GOARCH` to the
ReleaseKit process. Existing [configured checks](../config.md) inherit that
process environment unless their `env` maps override it;
[`RunChecks`](../../cmd/releasekit/internal/cli/config.go) adds the configured
and ReleaseKit-owned values to the child. This differs from built-in
application compilation, which chooses its target from the profile. A
disposable consumer's check using shell defaults for an application target
passed with the previous direct `go tool` invocation and no target
variables, then failed through the updated launcher because it observed
`linux/amd64`. Adding explicit `GOOS=windows` and `GOARCH=arm64` to that
check's `env` restored its behavior.

**Fix:** In the launcher adoption guidance, explain that host variables
reach configured child checks and that checks which need an application
target should set it explicitly in their existing `env` map or command.
Link to the configuration contract. Keep the current environment overlay
semantics and the separate profile selection for built-in builds.

### Align direct source and standalone CI recipes with the launcher guidance

**Evidence:** The [README quick start](../../README.md) and
[CLI reference](../cli.md) still recommend bare `go run ./cmd/releasekit`
for source invocation. The [consumer delivery guide](../consumers/delivery.md#woodpecker-tag-workflows)
also recommends bare `go install ...@PIN` for consumers who install the
delivery executable separately. These older recipes remain target-sensitive
alongside the new host-native launchers. On Linux/amd64 with inherited
`GOOS=windows GOARCH=arm64`, the README's actual `version` command failed
with an exec format error. A versioned install from a disposable local
module proxy failed under the same variables with `GOBIN` set; the native
install succeeded and its binary ran.

**Fix:** Link these recipes to the host-selection instructions and make the
native target requirement explicit at the source invocation and at the
standalone installation step. Use the existing recipe where a copyable
command is useful. Keep the selected version, install location, and
`go run` exit-status caveat. An already installed native binary does not
need a new bootstrap step.

## Algorithmic audit

The host normalization itself adds a fixed number of Go invocations per
launch. The CLI renders a fixed argument list, so quoting and formatting take
time and space linear in the lengths of the directory and record paths. Go
dependency inspection and compilation retain their existing roles. The
findings below concern a pre-existing algorithm on the audited recovery path
and a new module-selection defect in the smoke recipe.

### Relocate recovery replacements in one pass without merging selectors

**Evidence:** The API-only path in
[`RecoveryTool`](../../internal/gotool/recovery.go) walks the parsed
`go.mod` replacements. It calls `modfile.AddReplace` for each relative
local replacement. In the pinned `golang.org/x/mod` implementation,
each call scans the entire replacement slice. With `R` total directives
and `L` relative local directives, relocation visits `O(R × L)` entries,
and takes quadratic time when all or most entries require relocation.
This loop predates host normalization and still runs before the new host
query.

The same loop can panic on a valid module that declares both an unversioned
and a version-specific replacement for the same dependency. When the
unversioned directive appears first and uses a relative path, calling
`AddReplace` with an empty old version treats both directives as matches
and clears the version-specific entry. The outer loop then visits that
cleared entry as if it were another relative replacement. In a disposable
API-only consumer with both forms for ReleaseKit, Go accepted the module
and validation passed. After a local hook rejected the tag push, ReleaseKit
saved the publication record, then panicked in `modfile.addReplace`. It
exited with status 2 instead of reporting the rejected push and a recovery
handoff.

**Fix:** Rewrite each relative right-hand path on its existing parsed
directive in one pass, preserving the exact left-hand path and version
selector. For example, update the typed replacement and its corresponding
syntax token before formatting. This takes `O(R)` directive visits plus
the bytes processed for the paths and avoids selector merging. Keep the
existing relocation policy, the separate synthetic replacement for the
original module, and the private module lifetime. Add a recovery fixture
with distinct local destinations for a wildcard and a version-specific
replacement. Check that the handoff preserves both directives, selects the
version-specific destination, and reports the original publication status.

### Anchor smoke-check module paths to the intended checkout

**Evidence:** The [multi-module smoke recipe](../../examples/multi-module/README.md)
replaced `go -C integrations/...` with subshells that run
`cd integrations/...` before host discovery. A shell with `CDPATH` set can
resolve these relative names in another checkout. In a disposable probe
with matching module paths under two directories, the published snippet
sent both nested checks to the checkout named by `CDPATH` and returned
success. If the other checkout has valid profiles and tools, the smoke
result can appear valid for the wrong candidate.

**Fix:** Use `cd ./integrations/ckconfig` and `cd ./integrations/core/v2`,
or clear `CDPATH` for those two directory changes. The number of lookups is
already fixed; the change corrects which directory is selected. Verify the
copyable recipe with a conflicting `CDPATH` entry.