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authorEelco Dolstra <eelco.dolstra@logicblox.com>2014-07-10T09·51+0200
committerEelco Dolstra <eelco.dolstra@logicblox.com>2014-07-10T09·58+0200
commit04170d06bf7d17f882c01d3ab98885e0f3e46d2f (patch)
tree16acb88f8044f865bfbb846df666d622f151301c /src/libstore/build.cc
parent2c3a8f787ba9da49feafdec4022534184e0a96a3 (diff)
nix-copy-closure: Fix race condition
There is a long-standing race condition when copying a closure to a
remote machine, particularly affecting build-remote.pl: the client
first asks the remote machine which paths it already has, then copies
over the missing paths. If the garbage collector kicks in on the
remote machine between the first and second step, the already-present
paths may be deleted. The missing paths may then refer to deleted
paths, causing nix-copy-closure to fail. The client now performs both
steps using a single remote Nix call (using ‘nix-store --serve’),
locking all paths in the closure while querying.

I changed the --serve protocol a bit (getting rid of QueryCommand), so
this breaks the SSH substituter from older versions. But it was marked
experimental anyway.

Fixes #141.
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