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Add nix patch to implement builtins.catchAll

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This commit is contained in:
Rodrigo Arias 2025-10-13 17:25:13 +02:00
parent 019826d09e
commit 59d7374f78
3 changed files with 71 additions and 218 deletions
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1
overlay.nix
View File

@ -36,6 +36,7 @@ let
mpich = callPackage ./pkgs/mpich/default.nix { mpich = prev.mpich; };
nanos6 = callPackage ./pkgs/nanos6/default.nix { };
nanos6Debug = final.nanos6.override { enableDebug = true; };
nix = callPackage ./pkgs/nix/default.nix { nix = prev.nix; };
nixtools = callPackage ./pkgs/nixtools/default.nix { };
# Broken because of pkgsStatic.libcap
# See: https://github.com/NixOS/nixpkgs/pull/268791

64
pkgs/nix/add-catchAll.patch Normal file
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@ -0,0 +1,64 @@
From 3aa73c21e3afc91522a6121b0d591af6925b4ba6 Mon Sep 17 00:00:00 2001
From: Rodrigo Arias Mallo <rodarima@gmail.com>
Date: Mon, 13 Oct 2025 16:05:30 +0200
Subject: [PATCH] Add builtins.catchAll to catch all types of errors
Allows fetching multiple Git repositories with builtin.fetchGit and
catching any errors thrown by the builtin, in opposition to the builtin
tryEval.
---
src/libexpr/primops.cc | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 36a67a39d..3b26f9f43 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -849,6 +849,44 @@ static RegisterPrimOp primop_tryEval({
.fun = prim_tryEval,
});
+/* Like tryEval but catch all errors. Success => {success=true; value=something;},
+ * else => {success=false; value=false;} */
+static void prim_catchAll(EvalState & state, const PosIdx pos, Value * * args, Value & v)
+{
+ auto attrs = state.buildBindings(3);
+ try {
+ state.forceValue(*args[0], pos);
+ attrs.insert(state.sValue, args[0]);
+ attrs.alloc("success").mkBool(true);
+ attrs.alloc("msg").mkNull();
+ } catch (Error & e) {
+ attrs.alloc(state.sValue).mkBool(false);
+ attrs.alloc("success").mkBool(false);
+ attrs.alloc("msg").mkString(e.msg());
+ }
+ v.mkAttrs(attrs);
+}
+
+static RegisterPrimOp primop_catchAll({
+ .name = "__catchAll",
+ .args = {"e"},
+ .doc = R"(
+ Try to shallowly evaluate *e*. Return a set containing the
+ attributes `success` (`true` if *e* evaluated successfully,
+ `false` if an error was thrown) and `value`, equalling *e* if
+ successful and `false` otherwise. In contrast with `tryEval`,
+ `catchAll` will prevent all errors from being thrown, including
+ for those created by `abort` and type errors generated by
+ builtins. Also note that this doesn't evaluate *e* deeply, so
+ `let e = { x = throw ""; }; in (builtins.catchAll e).success`
+ will be `true`. Using `builtins.deepSeq` one can get the expected
+ result: `let e = { x = throw ""; }; in
+ (builtins.catchAll (builtins.deepSeq e e)).success` will be
+ `false`.
+ )",
+ .fun = prim_catchAll,
+});
+
/* Return an environment variable. Use with care. */
static void prim_getEnv(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
--
2.51.0

222
pkgs/nix/default.nix
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@ -1,219 +1,7 @@
{ lib, fetchurl, fetchFromGitHub, callPackage
, storeDir ? "/nix/store"
, stateDir ? "/nix/var"
, confDir ? "/etc"
, boehmgc
, stdenv, llvmPackages_6
}:
{ nix }:
let
common =
{ lib, stdenv, fetchpatch, perl, curl, bzip2, sqlite, openssl ? null, xz
, bash, coreutils, gzip, gnutar
, pkg-config, boehmgc, perlPackages, libsodium, brotli, boost, editline, nlohmann_json
, autoreconfHook, autoconf-archive, bison, flex, libxml2, libxslt, docbook5, docbook_xsl_ns
, jq, libarchive, rustc, cargo
# Used by tests
, gmock
, busybox-sandbox-shell
, storeDir
, stateDir
, confDir
, withLibseccomp ? lib.any (lib.meta.platformMatch stdenv.hostPlatform) libseccomp.meta.platforms, libseccomp
, withAWS ? stdenv.isLinux || stdenv.isDarwin, aws-sdk-cpp
, name, suffix ? "", src, crates ? null
}:
let
sh = busybox-sandbox-shell;
nix = stdenv.mkDerivation rec {
inherit name src;
version = lib.getVersion name;
is24 = lib.versionAtLeast version "2.4pre";
isExactly23 = lib.versionAtLeast version "2.3" && lib.versionOlder version "2.4";
VERSION_SUFFIX = suffix;
outputs = [ "out" "dev" "man" "doc" ];
nativeBuildInputs =
[ pkg-config ]
++ lib.optionals is24 [ autoreconfHook autoconf-archive bison flex libxml2 libxslt
docbook5 docbook_xsl_ns jq gmock ];
buildInputs =
[ curl openssl sqlite xz bzip2 nlohmann_json
brotli boost editline
]
++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium
++ lib.optionals is24 [ libarchive rustc cargo ]
++ lib.optional withLibseccomp libseccomp
++ lib.optional withAWS
((aws-sdk-cpp.override {
apis = ["s3" "transfer"];
customMemoryManagement = false;
}).overrideDerivation (args: {
patches = args.patches or [] ++ [(fetchpatch {
url = "https://github.com/edolstra/aws-sdk-cpp/commit/7d58e303159b2fb343af9a1ec4512238efa147c7.patch";
sha256 = "103phn6kyvs1yc7fibyin3lgxz699qakhw671kl207484im55id1";
})];
}));
propagatedBuildInputs = [ boehmgc ];
# Seems to be required when using std::atomic with 64-bit types
NIX_LDFLAGS = lib.optionalString (stdenv.hostPlatform.system == "armv5tel-linux" || stdenv.hostPlatform.system == "armv6l-linux") "-latomic";
preConfigure =
# Copy libboost_context so we don't get all of Boost in our closure.
# https://github.com/NixOS/nixpkgs/issues/45462
''
mkdir -p $out/lib
cp -pd ${boost}/lib/{libboost_context*,libboost_thread*,libboost_system*} $out/lib
rm -f $out/lib/*.a
${lib.optionalString stdenv.isLinux ''
chmod u+w $out/lib/*.so.*
patchelf --set-rpath $out/lib:${stdenv.cc.cc.lib}/lib $out/lib/libboost_thread.so.*
''}
'' +
# Unpack the Rust crates.
lib.optionalString is24 ''
tar xvf ${crates} -C nix-rust/
mv nix-rust/nix-vendored-crates* nix-rust/vendor
'' +
# For Nix-2.3, patch around an issue where the Nix configure step pulls in the
# build system's bash and other utilities when cross-compiling
lib.optionalString (stdenv.buildPlatform != stdenv.hostPlatform && isExactly23) ''
mkdir tmp/
substitute corepkgs/config.nix.in tmp/config.nix.in \
--subst-var-by bash ${bash}/bin/bash \
--subst-var-by coreutils ${coreutils}/bin \
--subst-var-by bzip2 ${bzip2}/bin/bzip2 \
--subst-var-by gzip ${gzip}/bin/gzip \
--subst-var-by xz ${xz}/bin/xz \
--subst-var-by tar ${gnutar}/bin/tar \
--subst-var-by tr ${coreutils}/bin/tr
mv tmp/config.nix.in corepkgs/config.nix.in
'';
configureFlags =
[ "--with-store-dir=${storeDir}"
"--localstatedir=${stateDir}"
"--sysconfdir=${confDir}"
"--disable-init-state"
"--enable-gc"
]
++ lib.optionals stdenv.isLinux [
"--with-sandbox-shell=${sh}/bin/busybox"
]
++ lib.optional (
stdenv.hostPlatform != stdenv.buildPlatform && stdenv.hostPlatform ? nix && stdenv.hostPlatform.nix ? system
) ''--with-system=${stdenv.hostPlatform.nix.system}''
# RISC-V support in progress https://github.com/seccomp/libseccomp/pull/50
++ lib.optional (!withLibseccomp) "--disable-seccomp-sandboxing";
makeFlags = [ "profiledir=$(out)/etc/profile.d" ];
installFlags = [ "sysconfdir=$(out)/etc" ];
doInstallCheck = false;
# socket path becomes too long otherwise
#preInstallCheck = lib.optional stdenv.isDarwin ''
# export TMPDIR=$NIX_BUILD_TOP
#'';
separateDebugInfo = stdenv.isLinux;
enableParallelBuilding = true;
meta = {
description = "Powerful package manager that makes package management reliable and reproducible";
longDescription = ''
Nix is a powerful package manager for Linux and other Unix systems that
makes package management reliable and reproducible. It provides atomic
upgrades and rollbacks, side-by-side installation of multiple versions of
a package, multi-user package management and easy setup of build
environments.
'';
homepage = "https://nixos.org/";
license = lib.licenses.lgpl2Plus;
maintainers = [ lib.maintainers.eelco ];
platforms = lib.platforms.unix;
outputsToInstall = [ "out" "man" ];
};
passthru = {
perl-bindings = stdenv.mkDerivation {
pname = "nix-perl";
inherit version;
inherit src;
postUnpack = "sourceRoot=$sourceRoot/perl";
# This is not cross-compile safe, don't have time to fix right now
# but noting for future travellers.
nativeBuildInputs =
[ perl pkg-config curl nix libsodium boost autoreconfHook autoconf-archive ];
configureFlags =
[ "--with-dbi=${perlPackages.DBI}/${perl.libPrefix}"
"--with-dbd-sqlite=${perlPackages.DBDSQLite}/${perl.libPrefix}"
nix.overrideAttrs (old: {
patches = (old.patches or []) ++ [
./add-catchAll.patch
];
preConfigure = "export NIX_STATE_DIR=$TMPDIR";
preBuild = "unset NIX_INDENT_MAKE";
};
};
};
in nix;
in rec {
nix = nixUnstable;
nixUnstable = lib.lowPrio (callPackage common rec {
name = "nix-2.4${suffix}";
suffix = "pre7534_b92f58f6";
#src = /home/Computational/rarias/nix/nix-rodarima;
src = fetchFromGitHub {
owner = "rodarima";
repo = "nix";
rev = "3a642187c33ed46d952d3a50a83b2576b704fab7";
sha256 = "0s8is2czpkcj1x1kcjqgbnsbbl03w3fwjjiclsd44zh1ij3wb90s";
};
crates = fetchurl {
url = "https://hydra.nixos.org/build/118797694/download/1/nix-vendored-crates-2.4pre7534_b92f58f6.tar.xz";
sha256 = "a4c2612bbd81732bbb899bc0c230e07b16f6b6150ffbb19c4907dedbbc2bf9fc";
};
inherit storeDir stateDir confDir boehmgc;
});
nixFlakes = lib.lowPrio (callPackage common rec {
name = "nix-2.4${suffix}";
suffix = "pre20200521_00b562c";
src = fetchFromGitHub {
owner = "NixOS";
repo = "nix";
rev = "00b562c87ec4c3bbe514f5dc1f4d1c41f66f66bf";
sha256 = "0s8is2czpkcj1x1kcjqgbnsbbl03w3fwjjiclsd44zh1ij3wb90s";
};
crates = fetchurl {
url = "https://hydra.nixos.org/build/118093786/download/1/nix-vendored-crates-2.4pre20200501_941f952.tar.xz";
sha256 = "060f4n5srdbb8vsj0m14aqch7im79a4h5g3nrs41p1xc602vhcdl";
};
inherit storeDir stateDir confDir boehmgc;
});
}
})