Implement askpass support #1354
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bjorn3
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This makes it slightly easier to add options in the future.
In practice I didn't observe any dangerous fds leaking to the editor process. Only the sockets used for communication with the parent process got leaked. The parent process already does not blindly trust writes to those sockets, so leaking them is fine. Still as a defence-in-depth when for example a PAM module forgets to close a file, add the missing mark_fds_as_cloexec anyway.
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This is still missing tests.
Fixes #1249