fed41f4959
nix-home is (hopefully) gonna be a home-manager alternative for my home directory. Files are symlinked into the home directory via GNU stow (since that is a tried and tested tool), so first step is to set up the base code for that. Implements a small tool that reads a single environment variable and prints it to stdout. Change-Id: Ifa3fd9f9e1cedc52c3002196d3971b02cb840e80 Reviewed-on: https://cl.tvl.fyi/c/depot/+/4832 Tested-by: BuildkiteCI Reviewed-by: Profpatsch <mail@profpatsch.de> Autosubmit: Profpatsch <mail@profpatsch.de>
66 lines
1.8 KiB
Nix
66 lines
1.8 KiB
Nix
{ lib, pkgs, depot, ... }:
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let
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toNetstring = s:
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"${toString (builtins.stringLength s)}:${s},";
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toNetstringList = xs:
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lib.concatStrings (map toNetstring xs);
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toNetstringKeyVal = attrs:
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lib.concatStrings
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(lib.mapAttrsToList
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(k: v: toNetstring (toNetstring k + toNetstring v))
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attrs);
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python-netstring = depot.users.Profpatsch.writers.python3Lib {
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name = "netstring";
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} ''
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def read_netstring(bytes):
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(int_length, rest) = bytes.split(sep=b':', maxsplit=1)
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val = rest[:int(int_length)]
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# has to end on a ,
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assert(rest[len(val)] == ord(','))
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return (val, rest[len(val) + 1:])
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def read_netstring_key_val(bytes):
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(keyvalnet, rest) = read_netstring(bytes)
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(key, valnet) = read_netstring(keyvalnet)
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(val, nothing) = read_netstring(valnet)
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assert(nothing == b"")
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return (key, val, rest)
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def read_netstring_key_val_list(bytes):
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rest = bytes
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res = {}
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while rest != b"":
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(key, val, r) = read_netstring_key_val(rest)
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rest = r
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res[key] = val
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return res
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'';
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rust-netstring = depot.nix.writers.rustSimpleLib {
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name = "netstring";
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} ''
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pub fn to_netstring(s: &[u8]) -> Vec<u8> {
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let len = s.len();
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// length of the integer as ascii
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let i_len = ((len as f64).log10() as usize) + 1;
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let ns_len = i_len + 1 + len + 1;
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let mut res = Vec::with_capacity(ns_len);
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res.extend_from_slice(format!("{}:", len).as_bytes());
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res.extend_from_slice(s);
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res.push(b',');
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res
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}
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'';
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in depot.nix.readTree.drvTargets {
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inherit
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toNetstring
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toNetstringList
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toNetstringKeyVal
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python-netstring
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rust-netstring
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;
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}
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