18e6db0f21
eprintenv is a debugging tool, as such the code should probably not crash when the environment variable we want to look at is missing. But we can print a warning instead. Change-Id: I41a24dc0c1cc488587563b85c1adbd089dd364f2 Reviewed-on: https://cl.tvl.fyi/c/depot/+/2525 Tested-by: BuildkiteCI Reviewed-by: Profpatsch <mail@profpatsch.de>
49 lines
1.4 KiB
Nix
49 lines
1.4 KiB
Nix
{ depot, pkgs, ... }:
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let
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bins = depot.nix.getBins pkgs.coreutils [ "printf" "echo" "cat" "printenv" ]
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// depot.nix.getBins pkgs.fdtools [ "multitee" ]
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;
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debugExec = msg: depot.nix.writeExecline "debug-exec" {} [
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"if" [
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"fdmove" "-c" "1" "2"
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"if" [ bins.printf "%s: " msg ]
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"if" [ bins.echo "$@" ]
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]
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"$@"
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];
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eprintf = depot.nix.writeExecline "eprintf" {} [
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"fdmove" "-c" "1" "2" bins.printf "$@"
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];
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eprint-stdin = depot.nix.writeExecline "eprint-stdin" {} [
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"pipeline" [ bins.multitee "0-1,2" ] "$@"
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];
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eprintenv = depot.nix.writeExecline "eprintenv" { readNArgs = 1; } [
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"ifelse" [ "fdmove" "-c" "1" "2" bins.printenv "$1" ]
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[ "$@" ]
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"if" [ eprintf "eprintenv: could not find \"\${1}\" in the environment\n" ]
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"$@"
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];
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# remove everything but a few selected environment variables
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runInEmptyEnv = keepVars:
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let
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importas = pkgs.lib.concatMap (var: [ "importas" "-i" var var ]) keepVars;
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# we have to explicitely call export here, because PATH is probably empty
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export = pkgs.lib.concatMap (var: [ "${pkgs.execline}/bin/export" var ''''${${var}}'' ]) keepVars;
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in depot.nix.writeExecline "empty-env" {}
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(importas ++ [ "emptyenv" ] ++ export ++ [ "${pkgs.execline}/bin/exec" "$@" ]);
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in {
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inherit
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debugExec
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eprintf
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eprint-stdin
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eprintenv
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runInEmptyEnv
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;
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}
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