The crash occurred because writeCreds got called twice, and writeFileProtected
neglected to close its file handle, so the file was open for write when
written the second time.
It seems unncessary and suboptimal that writeCreds gets called twice.
One call is from getRemoteCredPair and the other from setRemoteCredPair'.
What happens is that in the enableremote case, code that also runs at
initremote does unncessary work. Might be possible to improve that, but
I've gone for the simple fix.
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