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commitIdFromGitRepo: fix stackoverflow if many branches are used.

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If many branches are created than builtins.match stack overflows because
of a bug in libstdc++: see https://github.com/NixOS/nix/issues/2147
This commit is contained in:
Jörg Thalheim 2020-07-17 10:38:38 +01:00
parent 3829979d8d
commit d7e89fa661
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1 changed files with 7 additions and 3 deletions
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10
lib/sources.nix
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@ -145,10 +145,14 @@ rec {
# packed-refs file, so we have to grep through it:
then
let fileContent = readFile packedRefsName;
matchRef = match (".*\n([^\n ]*) " + file + "\n.*") fileContent;
in if matchRef == null
matchRef = builtins.match "([a-z0-9]+) ${file}";
isRef = s: builtins.isString s && (matchRef s) != null;
# there is a bug in libstdc++ leading to stackoverflow for long strings:
# https://github.com/NixOS/nix/issues/2147#issuecomment-659868795
refs = builtins.filter isRef (builtins.split "\n" fileContent);
in if refs == []
then throw ("Could not find " + file + " in " + packedRefsName)
else lib.head matchRef
else lib.head (matchRef (lib.head refs))
else throw ("Not a .git directory: " + path);
in readCommitFromFile "HEAD";