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Merge pull request #4313 from NixOS/fastReplaceDeps

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Exponentially reduce computation time needed for replace-dependency by u...
This commit is contained in:
roconnor 2014-09-28 21:19:55 -04:00
commit 6b2ecc5b39
1 changed files with 14 additions and 12 deletions
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26
pkgs/build-support/replace-dependency.nix
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@ -49,8 +49,13 @@ let
referencesOf = drv: getAttr (discard (toString drv)) references;
dependsOnOld = drv: elem oldStorepath (referencesOf drv) ||
any dependsOnOld (referencesOf drv);
dependsOnOldMemo = listToAttrs (map
(drv: { name = discard (toString drv);
value = elem oldStorepath (referencesOf drv) ||
any dependsOnOld (referencesOf drv);
}) (builtins.attrNames references));
dependsOnOld = drv: getAttr (discard (toString drv)) dependsOnOldMemo;
drvName = drv:
discard (substring 33 (stringLength (builtins.baseNameOf drv)) (builtins.baseNameOf drv));
@ -65,15 +70,12 @@ let
rewrittenDeps = listToAttrs [ {name = discard (toString oldDependency); value = newDependency;} ];
rewrittenDerivations = drv:
if dependsOnOld drv
then listToAttrs [ {
name = discard (toString drv);
rewriteMemo = listToAttrs (map
(drv: { name = discard (toString drv);
value = rewriteHashes (builtins.storePath drv)
(filterAttrs (n: v: builtins.elem (builtins.storePath (discard (toString n))) (referencesOf drv)) rewriteMemo);
})
(filter dependsOnOld (builtins.attrNames references))) // rewrittenDeps;
value = rewriteHashes drv (rewrittenDeps // (fold (drv: acc:
(rewrittenDerivations drv) // acc
) {} (referencesOf drv)));
} ]
else {};
in assert (stringLength (drvName (toString oldDependency)) == stringLength (drvName (toString newDependency)));
getAttr (discard (toString drv)) (rewrittenDerivations drv)
getAttr (discard (toString drv)) rewriteMemo