80 lines
2.8 KiB
Nix
80 lines
2.8 KiB
Nix
{ runCommand, nix, lib }:
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# Replace a single dependency in the requisites tree of drv, propagating
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# the change all the way up the tree, without a full rebuild. This can be
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# useful, for example, to patch a security hole in libc and still use your
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# system safely without rebuilding the world. This should be a short term
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# solution, as soon as a rebuild can be done the properly rebuild derivation
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# should be used. The old dependency and new dependency MUST have the same-length
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# name, and ideally should have close-to-identical directory layout.
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#
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# Example: safe-firefox = replace-dependency {
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# drv = firefox;
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# old-dependency = glibc;
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# new-dependency = overrideDerivation glibc (attrs: {
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# patches = attrs.patches ++ [ ./fix-glibc-hole.patch ];
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# });
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# };
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# This will rebuild glibc with your security patch, then copy over firefox
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# (and all of its dependencies) without rebuilding further.
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{ drv, old-dependency, new-dependency }:
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with lib;
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let
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references = import (runCommand "references.nix" { exportReferencesGraph = [ "graph" drv ]; } ''
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(echo {
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while read path
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do
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echo " \"$path\" = ["
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read count
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read count
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while [ "0" != "$count" ]
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do
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read ref_path
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if [ "$ref_path" != "$path" ]
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then
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echo " (builtins.storePath $ref_path)"
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fi
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count=$(($count - 1))
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done
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echo " ];"
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done < graph
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echo }) > $out
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'').outPath;
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discard = builtins.unsafeDiscardStringContext;
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old-storepath = builtins.storePath (discard (toString old-dependency));
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references-of = drv: getAttr (discard (toString drv)) references;
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depends-on-old = drv: elem old-storepath (references-of drv) ||
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any depends-on-old (references-of drv);
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drv-name = drv:
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discard (substring 33 (stringLength (builtins.baseNameOf drv)) (builtins.baseNameOf drv));
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rewrite-hashes = drv: hashes: runCommand (drv-name drv) { nixStore = "${nix}/bin/nix-store"; } ''
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$nixStore --dump ${drv} | sed 's|${baseNameOf drv}|'$(basename $out)'|g' | sed -e ${
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concatStringsSep " -e " (mapAttrsToList (name: value:
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"'s|${baseNameOf name}|${baseNameOf value}|g'"
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) hashes)
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} | $nixStore --restore $out
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'';
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rewritten-deps = listToAttrs [ {name = discard (toString old-dependency); value = new-dependency;} ];
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rewritten-derivations = drv:
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if depends-on-old drv
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then listToAttrs [ {
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name = discard (toString drv);
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value = rewrite-hashes drv (rewritten-deps // (fold (drv: acc:
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(rewritten-derivations drv) // acc
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) {} (references-of drv)));
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} ]
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else {};
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in assert (stringLength (drv-name (toString old-dependency)) == stringLength (drv-name (toString new-dependency)));
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getAttr (discard (toString drv)) (rewritten-derivations drv)
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