macOS: Remove flags
In particular, UF_IMMUTABLE (uchg) needs to be cleared to allow the
path to be garbage-collected or optimised.
See https://github.com/NixOS/nixpkgs/issues/25819.
+ the file from being garbage-collected.
(cherry picked from commit b5bdfdef73
)
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@ -571,6 +571,16 @@ static void canonicalisePathMetaData_(const Path & path, uid_t fromUid, InodesSe
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{
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checkInterrupt();
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#if __APPLE__
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/* Remove flags, in particular UF_IMMUTABLE which would prevent
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the file from being garbage-collected. FIXME: Use
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setattrlist() to remove other attributes as well. */
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if (lchflags(path.c_str(), 0)) {
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if (errno != ENOTSUP)
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throw SysError(format("clearing flags of path ‘%1%’") % path);
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}
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#endif
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struct stat st;
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if (lstat(path.c_str(), &st))
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throw SysError(format("getting attributes of path ‘%1%’") % path);
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