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Diffstat (limited to 'src/globals.hh')
| -rw-r--r-- | src/globals.hh | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/globals.hh b/src/globals.hh index 2fb9fe7476d3..8d8c63bd7565 100644 --- a/src/globals.hh +++ b/src/globals.hh @@ -30,6 +30,21 @@ extern string dbHash2Paths; */ extern string dbSuccessors; +/* dbSubstitutes :: Hash -> [Hash] + + Each pair $(h, [hs])$ tells Nix that it can realise any of the + fstate expressions referenced by the hashes in $hs$ to obtain a Nix + archive that, when unpacked, will produce a path with hash $h$. + + The main purpose of this is for distributed caching of derivates. + One system can compute a derivate with hash $h$ and put it on a + website (as a Nix archive), for instance, and then another system + can register a substitute for that derivate. The substitute in + this case might be an fstate expression that fetches the Nix + archive. +*/ +extern string dbSubstitutes; + /* Path names. */ |