feat(nix/drvSeqL): make build of a drv depend on unrelated drvs

This adds the star of NixCon 2017 from vuizvui, slightly reformatted and
now using yants. While it has some flaws, I realized that it is ideal to
run the tests of rustSimple{Lib,Bin} where the normal and the -tests
variant would have to be rebuilt if either the tests or the library /
executable itself changes.

Change-Id: Ie8f84f98c51c9fafc046eff916c8f0df7e8f224b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2528
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>
This commit is contained in:
sterni 2021-02-14 12:29:07 +01:00
parent 5a08316a3c
commit abbc538ef3

43
nix/drvSeqL/default.nix Normal file
View file

@ -0,0 +1,43 @@
{ depot, lib, pkgs, ... }:
let
inherit (depot.nix.yants)
defun
list
drv
;
/* Realize drvDeps, then return drvOut if that succeds.
* This can be used to make drvOut depend on the
* build success of all drvDeps without making each drvDep
* a dependency of drvOut.
* => drvOut is not rebuilt if drvDep changes
*/
drvSeqL = defun [ (list drv) drv drv ]
(drvDeps: drvOut:
let
drvOutOutputs = drvOut.outputs or ["out"];
in
pkgs.runCommandLocal drvOut.name {
# we inherit all attributes in order to replicate
# the original derivation as much as possible
outputs = drvOutOutputs;
passthru = drvOut.drvAttrs;
# depend on drvDeps (by putting it in builder context)
inherit drvDeps;
}
# the outputs of the original derivation are replicated
# by creating a symlink to the old output path
(lib.concatMapStrings (output: ''
target=${lib.escapeShellArg drvOut.${output}}
# if the target is already a symlink, follow it until its not;
# this is done to prevent too many dereferences
target=$(readlink -e "$target")
# link to the output
ln -s "$target" "${"$"}${output}"
'') drvOutOutputs));
in {
__functor = _: drvSeqL;
}