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{ stdenv, bin, lib }:
name:
{
# a string to pass as stdin to the execline script
stdin ? ""
# a program wrapping the acutal execline invocation;
# should be in Bernstein-chaining style
, builderWrapper ? bin.exec
# additional arguments to pass to the derivation
, derivationArgs ? {}
}:
# the execline script as a nested list of string,
# representing the blocks;
# see docs of `escapeExecline`.
execline:
# those arguments can’t be overwritten
assert !derivationArgs ? system;
assert !derivationArgs ? name;
assert !derivationArgs ? builder;
assert !derivationArgs ? args;
derivation (derivationArgs // {
# TODO: what about cross?
inherit (stdenv) system;
inherit name;
# okay, `builtins.toFile` does not accept strings
# that reference drv outputs. This means we need
# to pass the script and stdin as envvar;
# this might clash with another passed envar,
# so we give it a long & unique name
_runExeclineScript =
let
escape = (import ./escape.nix { inherit lib; });
in escape.escapeExecline execline;
_runExeclineStdin = stdin;
passAsFile = [
"_runExeclineScript"
"_runExeclineStdin"
] ++ derivationArgs.passAsFile or [];
# the default, exec acts as identity executable
builder = builderWrapper;
args = [
bin.importas # import script file as $script
"-ui" # drop the envvar afterwards
"script" # substitution name
"_runExeclineScriptPath" # passed script file
# TODO: can we scrap stdin via builderWrapper?
bin.importas # do the same for $stdin
"-ui"
"stdin"
"_runExeclineStdinPath"
bin.redirfd # now we
"-r" # read the file
"0" # into the stdin of execlineb
"$stdin" # that was given via stdin
bin.execlineb # the actual invocation
# TODO: depending on the use-case, -S0 might not be enough
# in all use-cases, then a wrapper for execlineb arguments
# should be added (-P, -S, -s).
"-S0" # set $@ inside the execline script
"-W" # die on syntax error
"$script" # substituted by importas
];
})
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