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nixpkgs/pkgs/build-support/build-bazel-package/default.nix
Nikolay Amiantov 4dad0ae560 buildBazelPackage: cleanup hacks and enforce them for all builds
Timestamp verification skip is no longer needed (not sure why). Generally we
better off always using the environment hack for all packages because that
ensures all NIX_* flags are correctly applied.

One possible improvement in future is to filter only NIX_* variables to
passthru in Bazel.
2019-07-17 10:40:38 +03:00

125 lines
4.1 KiB
Nix

{ stdenv, bazel, cacert }:
args@{ name, bazelFlags ? [], bazelTarget, buildAttrs, fetchAttrs, ... }:
let
fArgs = removeAttrs args [ "buildAttrs" "fetchAttrs" ];
fBuildAttrs = fArgs // buildAttrs;
fFetchAttrs = fArgs // removeAttrs fetchAttrs [ "sha256" ];
in stdenv.mkDerivation (fBuildAttrs // {
inherit name bazelFlags bazelTarget;
deps = stdenv.mkDerivation (fFetchAttrs // {
name = "${name}-deps";
inherit bazelFlags bazelTarget;
nativeBuildInputs = fFetchAttrs.nativeBuildInputs or [] ++ [ bazel ];
preHook = fFetchAttrs.preHook or "" + ''
export bazelOut="$(echo ''${NIX_BUILD_TOP}/output | sed -e 's,//,/,g')"
export bazelUserRoot="$(echo ''${NIX_BUILD_TOP}/tmp | sed -e 's,//,/,g')"
export HOME="$NIX_BUILD_TOP"
# This is needed for git_repository with https remotes
export GIT_SSL_CAINFO="${cacert}/etc/ssl/certs/ca-bundle.crt"
'';
buildPhase = fFetchAttrs.buildPhase or ''
runHook preBuild
# Bazel computes the default value of output_user_root before parsing the
# flag. The computation of the default value involves getting the $USER
# from the environment. I don't have that variable when building with
# sandbox enabled. Code here
# https://github.com/bazelbuild/bazel/blob/9323c57607d37f9c949b60e293b573584906da46/src/main/cpp/startup_options.cc#L123-L124
#
# On macOS Bazel will use the system installed Xcode or CLT toolchain instead of the one in the PATH unless we pass BAZEL_USE_CPP_ONLY_TOOLCHAIN
# We disable multithreading for the fetching phase since it can lead to timeouts with many dependencies/threads:
# https://github.com/bazelbuild/bazel/issues/6502
BAZEL_USE_CPP_ONLY_TOOLCHAIN=1 \
USER=homeless-shelter \
bazel \
--output_base="$bazelOut" \
--output_user_root="$bazelUserRoot" \
fetch \
--loading_phase_threads=1 \
$bazelFlags \
$bazelTarget
runHook postBuild
'';
installPhase = fFetchAttrs.installPhase or ''
runHook preInstall
# Remove all built in external workspaces, Bazel will recreate them when building
rm -rf $bazelOut/external/{bazel_tools,\@bazel_tools.marker}
rm -rf $bazelOut/external/{embedded_jdk,\@embedded_jdk.marker}
rm -rf $bazelOut/external/{local_*,\@local_*}
# Patching markers to make them deterministic
find $bazelOut/external -name '@*\.marker' -exec sed -i \
-e 's, -\?[0-9][0-9]*$, 1,' \
-e '/^ENV:TMP.*/d' \
'{}' \;
# Remove all vcs files
rm -rf $(find $bazelOut/external -type d -name .git)
rm -rf $(find $bazelOut/external -type d -name .svn)
rm -rf $(find $bazelOut/external -type d -name .hg)
# Patching symlinks to remove build directory reference
find $bazelOut/external -type l | while read symlink; do
new_target="$(readlink "$symlink" | sed "s,$NIX_BUILD_TOP,NIX_BUILD_TOP,")"
rm "$symlink"
ln -sf "$new_target" "$symlink"
done
cp -r $bazelOut/external $out
runHook postInstall
'';
dontFixup = true;
allowedRequisites = [];
outputHashMode = "recursive";
outputHashAlgo = "sha256";
outputHash = fetchAttrs.sha256;
});
nativeBuildInputs = fBuildAttrs.nativeBuildInputs or [] ++ [ (bazel.override { enableNixHacks = true; }) ];
preHook = fBuildAttrs.preHook or "" + ''
export bazelOut="$NIX_BUILD_TOP/output"
export bazelUserRoot="$NIX_BUILD_TOP/tmp"
export HOME="$NIX_BUILD_TOP"
'';
preConfigure = ''
mkdir -p "$bazelOut"
cp -r $deps $bazelOut/external
chmod -R +w $bazelOut
find $bazelOut -type l | while read symlink; do
ln -sf $(readlink "$symlink" | sed "s,NIX_BUILD_TOP,$NIX_BUILD_TOP,") "$symlink"
done
'' + fBuildAttrs.preConfigure or "";
buildPhase = fBuildAttrs.buildPhase or ''
runHook preBuild
BAZEL_USE_CPP_ONLY_TOOLCHAIN=1 \
USER=homeless-shelter \
bazel \
--output_base="$bazelOut" \
--output_user_root="$bazelUserRoot" \
build \
-j $NIX_BUILD_CORES \
$bazelFlags \
$bazelTarget
runHook postBuild
'';
})