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The references set seems to have been unused since `LegacySSHStore`
references were first created in
caa5793b4a74049ee37dd88eb1c5b785456ce40d.
The method decls never were upstream, and accidentally added by me in
062533f7cdb74026096ca8c7d5b6e393893d59ef (probably due to `git rerere`).
Sorry!
This reduces the diff from #3746.
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This adds a new store operation 'addMultipleToStore' that reads a
number of NARs and ValidPathInfos from a Source, allowing any number
of store paths to be copied in a single call. This is much faster on
high-latency links when copying a lot of small files, like .drv
closures.
For example, on a connection with an 50 ms delay:
Before:
$ nix copy --to 'unix:///tmp/proxy-socket?root=/tmp/dest-chroot' \
/nix/store/90jjw94xiyg5drj70whm9yll6xjj0ca9-hello-2.10.drv \
--derivation --no-check-sigs
real 0m57.868s
user 0m0.103s
sys 0m0.056s
After:
real 0m0.690s
user 0m0.017s
sys 0m0.011s
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We did this in the same spirit of the dummy value that's present in
libstore/path.hh
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