dolang-shell-modules 0.1.0

Stock embedded Do modules for the shell.
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import shell sys

pub def bin exe = nil
  let vfs_exe = shell.vfs_exe()
  if vfs_exe
    return vfs_exe

  let exe = (exe || shell.exe).canonical()
  let bin = exe.with_stem "dolang-vfs"
  let bin_meta = bin.metadata follow: false

  if (bin_meta.type != :FILE:)
    throw "VFS helper is not a regular file: $bin"
  if (sys.os_info().family != :WINDOWS:)
    let exe_meta = exe.metadata follow: false
    if (bin_meta.uid != exe_meta.uid)
      throw "VFS helper owner does not match interpreter: $bin"
    if (bin_meta.gid != exe_meta.gid)
      throw "VFS helper group does not match interpreter: $bin"
    if ((bin_meta.mode & 0o7777) != (exe_meta.mode & 0o7777))
      throw "VFS helper permissions do not match interpreter: $bin"

  bin