lib: add shortcuts for fake hashes (fakeSha256, fakeSha512)

Fake hashes can be used as placeholders for all the places, where
Nix expression requires a hash, but we don't yet have one.

This should be more convenient than following:
- echo|sha256sum, copy into clipboard, go to editor, paste into previously
  edited place
- search nixpkgs for a random package, copy it's hash to cliboard, go to
  editor, paste into previously edited place

Nix can add support for these fake hashes. In that case printed error should contain
only 1 hash, so no more problem "which of two hashes from error should I use?"

Idea by irc:Synthetica
This commit is contained in:
danbst 2019-01-10 15:08:50 +02:00
parent 7d864c6bd6
commit 68a6b47b8c
2 changed files with 5 additions and 0 deletions

View file

@ -132,6 +132,7 @@ let
mergeAttrsWithFunc mergeAttrsConcatenateValues
mergeAttrsNoOverride mergeAttrByFunc mergeAttrsByFuncDefaults
mergeAttrsByFuncDefaultsClean mergeAttrBy
fakeSha256 fakeSha512
nixType imap;
});
in lib

View file

@ -270,4 +270,8 @@ rec {
starting at zero.
*/
imap = imap1;
# Fake hashes. Can be used as hash placeholders, when computing hash ahead isn't trivial
fakeSha256 = "0000000000000000000000000000000000000000000000000000000000000000";
fakeSha512 = "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000";
}