Improved error message when encountering unsupported file types
Fixes #269.
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@ -551,9 +551,9 @@ static void canonicalisePathMetaData_(const Path & path, uid_t fromUid, InodesSe
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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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/* Really make sure that the path is of a supported type. This
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has already been checked in dumpPath(). */
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assert(S_ISREG(st.st_mode) || S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode));
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/* Really make sure that the path is of a supported type. */
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if (!(S_ISREG(st.st_mode) || S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode)))
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throw Error(format("file ‘%1%’ has an unsupported type") % path);
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/* Fail if the file is not owned by the build user. This prevents
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us from messing up the ownership/permissions of files
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