forked from lix-project/lix
6644b6099b
This exploits the hermetic nature of flake evaluation to speed up
repeated evaluations of a flake output attribute.
For example (doing 'nix build' on an already present package):
$ time nix build nixpkgs:firefox
real 0m1.497s
user 0m1.160s
sys 0m0.139s
$ time nix build nixpkgs:firefox
real 0m0.052s
user 0m0.038s
sys 0m0.007s
The cache is ~/.cache/nix/eval-cache-v1.sqlite, which has entries like
INSERT INTO Attributes VALUES(
X'92a907d4efe933af2a46959b082cdff176aa5bfeb47a98fabd234809a67ab195',
'packages.firefox',
1,
'/nix/store/pbalzf8x19hckr8cwdv62rd6g0lqgc38-firefox-67.0.drv /nix/store/g6q0gx0v6xvdnizp8lrcw7c4gdkzana0-firefox-67.0 out');
where the hash 92a9... is a fingerprint over the flake store path and
the contents of the lockfile. Because flakes are evaluated in pure
mode, this uniquely identifies the evaluation result.
|
||
|---|---|---|
| .. | ||
| add-to-store.cc | ||
| build.cc | ||
| cat.cc | ||
| command.cc | ||
| command.hh | ||
| copy.cc | ||
| doctor.cc | ||
| dump-path.cc | ||
| edit.cc | ||
| eval.cc | ||
| flake-template.nix | ||
| flake.cc | ||
| hash.cc | ||
| installables.cc | ||
| legacy.cc | ||
| legacy.hh | ||
| local.mk | ||
| log.cc | ||
| ls.cc | ||
| main.cc | ||
| optimise-store.cc | ||
| path-info.cc | ||
| ping-store.cc | ||
| progress-bar.cc | ||
| progress-bar.hh | ||
| repl.cc | ||
| run.cc | ||
| search.cc | ||
| shell.cc | ||
| show-config.cc | ||
| show-derivation.cc | ||
| sigs.cc | ||
| upgrade-nix.cc | ||
| verify.cc | ||
| why-depends.cc | ||