Codex's install.ps1 puts %LOCALAPPDATA%\Programs\OpenAI\Codex\bin on PATH.
That folder is a junction to ~\.codex\packages\standalone\current\bin, and
current is a junction to releases\<version>-<target>, retargeted by each
update. filepath.EvalSymlinks leaves junctions alone since Go 1.23, so
magpie saw the binary only as ...\Programs\OpenAI\Codex\bin\codex.exe:
- howInstalled didn't find .codex/packages/standalone in its path, so the
Agents page showed the version with no newest version and no update.
- installedVersion's stamp was that unchanged path plus size and mtime.
npm's archive, which install.ps1's legacy layout copies from, gives every
version's codex.exe the same 1985 mtime. So a new release was asked again
only if its size happened to differ, else after the 24h memo.
proc.RealPath is now the path Windows opens (GetFinalPathNameByHandle),
junctions followed, and filepath.EvalSymlinks elsewhere. cliupdate's
howInstalled and installedVersion and proc.Version use it.
TestCodexInstallPs1Junctions (Windows) builds install.ps1's layout with
mklink /J, two releases whose codex.exe have the same bytes and mtime. It
checks that codex is recognized as self-updated (codex update) and that
retargeting current makes the version asked again. On the Windows box
(10.0.0.132, sandboxed USERPROFILE/APPDATA/LOCALAPPDATA) it fails on the old
code (howInstalled nil; "0.161.0" after the update) and passes on the new.
The rest of the agent package fails on Windows with the same 17 tests
before and after (TestFolderVarsAreListed, TestAside*, TestVSCodium, ...),
which CI never runs there. `codex update` on Windows is in codex.exe 0.162.0
(win32-x64): it runs install.ps1. The layout was read from
https://chatgpt.com/codex/install.ps1.
Not tried with a real install.ps1 install (it rewrites the user's PATH in
the registry). go test -tags nogui ./internal/agent ./internal/proc
./internal/provider ./internal/library (macOS), gofmt, and go vet for
GOOS=linux and windows pass.