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What happens if I push all of nixpkgs
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{ beforeDir, afterDir, evalSystem,}:
let # Usually we expect a derivation, but when evaluating in multiple separate steps, we pass # nix store paths around. These need to be turned into (fake) derivations again to track # dependencies properly. # We use two steps for evaluation, because we compare results from two different checkouts. # CI additionalls spreads evaluation across multiple workers. before = if lib.isDerivation beforeDir then beforeDir else lib.toDerivation beforeDir; after = if lib.isDerivation afterDir then afterDir else lib.toDerivation afterDir;
/* Computes the key difference between two attrs
{ added: [ <keys only in the second object> ], removed: [ <keys only in the first object> ], changed: [ <keys with different values between the two objects> ], rebuilds: [ <keys in the second object with values not present at all in first object> ], } */ diff = old: new: let filterKeys = cond: attrs: lib.attrNames (lib.filterAttrs cond attrs); oldOutputs = lib.pipe old [ (lib.mapAttrsToList (_: lib.attrValues)) lib.concatLists (lib.flip lib.genAttrs (_: true)) ]; in { added = filterKeys (n: _: !(old ? ${n})) new; removed = filterKeys (n: _: !(new ? ${n})) old; changed = filterKeys ( n: v: # Filter out attributes that don't exist anymore (new ? ${n})
# Filter out attributes that are the same as the new value && (v != (new.${n})) ) old; # A "rebuild" is every attrpath ... rebuilds = filterKeys ( _: pkg: # ... that has at least one output ... lib.any ( output: # ... which has not been built in "old" already. !(oldOutputs ? ${output}) ) (lib.attrValues pkg) ) new; };
getAttrs = dir: let raw = builtins.readFile "${dir}/${evalSystem}/paths.json"; # The file contains Nix paths; we need to ignore them for evaluation purposes, # else there will be a "is not allowed to refer to a store path" error. data = builtins.unsafeDiscardStringContext raw; in builtins.fromJSON data;
beforeAttrs = getAttrs before; afterAttrs = getAttrs after; diffAttrs = diff beforeAttrs afterAttrs; diffJson = writeText "diff.json" (builtins.toJSON diffAttrs);inrunCommand "diff" { } '' mkdir -p $out/${evalSystem}
cp -r ${before} $out/before cp -r ${after} $out/after cp ${diffJson} $out/${evalSystem}/diff.json''