forked from lix-project/lix
5cd72598fe
Impure derivations are derivations that can produce a different result
every time they're built. Example:
stdenv.mkDerivation {
name = "impure";
__impure = true; # marks this derivation as impure
outputHashAlgo = "sha256";
outputHashMode = "recursive";
buildCommand = "date > $out";
};
Some important characteristics:
* This requires the 'impure-derivations' experimental feature.
* Impure derivations are not "cached". Thus, running "nix-build" on
the example above multiple times will cause a rebuild every time.
* They are implemented similar to CA derivations, i.e. the output is
moved to a content-addressed path in the store. The difference is
that we don't register a realisation in the Nix database.
* Pure derivations are not allowed to depend on impure derivations. In
the future fixed-output derivations will be allowed to depend on
impure derivations, thus forming an "impurity barrier" in the
dependency graph.
* When sandboxing is enabled, impure derivations can access the
network in the same way as fixed-output derivations. In relaxed
sandboxing mode, they can access the local filesystem.
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|---|---|---|
| .. | ||
| build | ||
| builtins | ||
| tests | ||
| binary-cache-store.cc | ||
| binary-cache-store.hh | ||
| build-result.hh | ||
| builtins.hh | ||
| ca-specific-schema.sql | ||
| content-address.cc | ||
| content-address.hh | ||
| crypto.cc | ||
| crypto.hh | ||
| daemon.cc | ||
| daemon.hh | ||
| derivations.cc | ||
| derivations.hh | ||
| derived-path.cc | ||
| derived-path.hh | ||
| dummy-store.cc | ||
| export-import.cc | ||
| filetransfer.cc | ||
| filetransfer.hh | ||
| fs-accessor.hh | ||
| gc-store.hh | ||
| gc.cc | ||
| globals.cc | ||
| globals.hh | ||
| http-binary-cache-store.cc | ||
| legacy-ssh-store.cc | ||
| local-binary-cache-store.cc | ||
| local-fs-store.cc | ||
| local-fs-store.hh | ||
| local-store.cc | ||
| local-store.hh | ||
| local.mk | ||
| lock.cc | ||
| lock.hh | ||
| log-store.hh | ||
| machines.cc | ||
| machines.hh | ||
| make-content-addressed.cc | ||
| make-content-addressed.hh | ||
| misc.cc | ||
| names.cc | ||
| names.hh | ||
| nar-accessor.cc | ||
| nar-accessor.hh | ||
| nar-info-disk-cache.cc | ||
| nar-info-disk-cache.hh | ||
| nar-info.cc | ||
| nar-info.hh | ||
| nix-store.pc.in | ||
| optimise-store.cc | ||
| parsed-derivations.cc | ||
| parsed-derivations.hh | ||
| path-info.cc | ||
| path-info.hh | ||
| path-with-outputs.cc | ||
| path-with-outputs.hh | ||
| path.cc | ||
| path.hh | ||
| pathlocks.cc | ||
| pathlocks.hh | ||
| profiles.cc | ||
| profiles.hh | ||
| realisation.cc | ||
| realisation.hh | ||
| references.cc | ||
| references.hh | ||
| remote-fs-accessor.cc | ||
| remote-fs-accessor.hh | ||
| remote-store.cc | ||
| remote-store.hh | ||
| repair-flag.hh | ||
| s3-binary-cache-store.cc | ||
| s3-binary-cache-store.hh | ||
| s3.hh | ||
| sandbox-defaults.sb | ||
| sandbox-minimal.sb | ||
| sandbox-network.sb | ||
| schema.sql | ||
| serve-protocol.hh | ||
| sqlite.cc | ||
| sqlite.hh | ||
| ssh-store.cc | ||
| ssh.cc | ||
| ssh.hh | ||
| store-api.cc | ||
| store-api.hh | ||
| store-cast.hh | ||
| uds-remote-store.cc | ||
| uds-remote-store.hh | ||
| worker-protocol.hh | ||