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nixpkgs/nixos/lib/utils.nix

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pkgs: with pkgs.lib;
rec {
# Escape a path according to the systemd rules, e.g. /dev/xyzzy
# becomes dev-xyzzy. FIXME: slow.
escapeSystemdPath = s:
replaceChars ["/" "-" " "] ["-" "\\x2d" "\\x20"] (substring 1 (stringLength s) s);
}