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https://github.com/NixOS/nixpkgs.git
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29 lines
1 KiB
Nix
29 lines
1 KiB
Nix
pkgs: with pkgs.lib;
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rec {
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# Check whenever fileSystem is needed for boot
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fsNeededForBoot = fs: fs.neededForBoot
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|| elem fs.mountPoint [ "/" "/nix" "/nix/store" "/var" "/var/log" "/var/lib" "/etc" ];
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# Check whenever `b` depends on `a` as a fileSystem
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# FIXME: it's incorrect to simply use hasPrefix here: "/dev/a" is not a parent of "/dev/ab"
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fsBefore = a: b: ((any (x: elem x [ "bind" "move" ]) b.options) && (a.mountPoint == b.device))
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|| (hasPrefix a.mountPoint b.mountPoint);
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# Escape a path according to the systemd rules, e.g. /dev/xyzzy
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# becomes dev-xyzzy. FIXME: slow.
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escapeSystemdPath = s:
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replaceChars ["/" "-" " "] ["-" "\\x2d" "\\x20"]
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(if hasPrefix "/" s then substring 1 (stringLength s) s else s);
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# Returns a system path for a given shell package
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toShellPath = shell:
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if types.shellPackage.check shell then
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"/run/current-system/sw${shell.shellPath}"
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else if types.package.check shell then
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throw "${shell} is not a shell package"
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else
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shell;
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}
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