The pipe's FDs got inherited by ssh and it did something that kept them
open even once it exited. Probably involving passing them on to the ssh
mux daemon.
Set close on exec, and all is well.
Kept Annex.Ssh not using processTranscript even though it no longer
hangs when it does use it, just because processTranscript is overkill
there.
This commit was supported by the NSF-funded DataLad project.
This is much clearer to follow.
I've tested this, and it still has the problem described in
doc/bugs/occasional_hang_with_p2pstdio.mdwn
Which I think indicates that problem is not with my code, but something
else. ghc runtime? Something crazy ssh does in this situation? Unsure..
Fix race condition in ssh warmup that caused git-annex to get stuck and
never process some while when run with high levels of concurrency.
So far, I've isolated the problem to processTranscript, which hangs
reading output from ssh in this situation. I don't yet understand why
processTranscript behaves that way.
Since here we don't care about the ssh output, and only want to /dev/null
it, changed to not use processTranscript, avoiding its problem.
This commit was supported by the NSF-funded DataLad project.
Some blake hash varieties were not yet available in that version.
Rather than tracking exact details of what cryptonite supported when,
disable blake unless using a current cryptonite.
Avoid creating transfer info file before transfer lock is created and
locked.
The wrong order for one thing caused transfer info to be overwritten
when a transfer was already in progress.
But worse, it caused checkTransfer to see the transfer info,
and so lock the transfer lock in order to verify the transfer was not in
progress. Which in a concurrent situation, prevented the transferrer
from locking the transfer lock, so it failed with "transfer already in
progress".
Note that the transferinfo command does not lock the transfer lock
before creating the transfer info. But, that's only run after
recvkey is running, and recvkey does lock the transfer lock, so that
seems more or less ok. (Other than being a super complicated legacy mess
that the P2P code has mostly obsoleted now.)
This commit was supported by the NSF-funded DataLad project.
