cmdutil: replace unix pipe handshake with file lock
The pipe handshake cannot be implemented with Windows detached process, which
disables handle inheritance.
Fix 2/3 for issue421
adding a
79abf14474dc tip
% make sure we notice the change of mode if the cached size == -1
n 0 -1 unset a
M a
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
d69afc33ff8a
not executable -- whew