The Bun.env scrub and filterProcessEnv used isValidEnvName (strict shell
identifier shape), which deleted standard Windows variables like
ProgramFiles(x86) and CommonProgramFiles(x86). procmgr.ts imports this
module before resolving the shell and reads Bun.env['ProgramFiles(x86)']
to find Git Bash under 32-bit Program Files, so installations that only
had Git there were no longer discovered and failed with 'No bash shell
found'.
The unsafe cases for native execve are '=' or NUL in names and NUL in
values, not parentheses. Introduce isSafeEnvName covering exactly those
cases and use it for the in-place Bun.env scrub and the spawn-env
filter. Keep isValidEnvName (strict) for dotenv parsing, where strict
shell-identifier shape is the right contract.
can1357
4b6be0b0df