nixpkgs/pkgs/build-support/build-bazel-package/default.nix

142 lines
4.9 KiB
Nix

{ stdenv, bazel, cacert, enableNixHacks ? true }:
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 $out
runHook postInstall
'';
dontFixup = true;
outputHashMode = "recursive";
outputHashAlgo = "sha256";
outputHash = fetchAttrs.sha256;
});
nativeBuildInputs = fBuildAttrs.nativeBuildInputs or [] ++ [ (if enableNixHacks then (bazel.override { enableNixHacks = true; }) else bazel) ];
preHook = fBuildAttrs.preHook or "" + ''
export bazelOut="$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 sandboxes the execution of the tools it invokes, so even though we are
# calling the correct nix wrappers, the values of the environment variables
# the wrappers are expecting will not be set. So instead of relying on the
# wrappers picking them up, pass them in explicitly via `--copt`, `--linkopt`
# and related flags.
#
copts=()
host_copts=()
for flag in $NIX_CFLAGS_COMPILE; do
copts+=( "--copt=$flag" )
host_copts+=( "--host_copt=$flag" )
done
for flag in $NIX_CXXSTDLIB_COMPILE; do
copts+=( "--copt=$flag" )
host_copts+=( "--host_copt=$flag" )
done
linkopts=()
host_linkopts=()
for flag in $NIX_LD_FLAGS; do
linkopts+=( "--linkopt=$flag" )
host_linkopts+=( "--host_linkopt=$flag" )
done
BAZEL_USE_CPP_ONLY_TOOLCHAIN=1 \
USER=homeless-shelter \
bazel \
--output_base="$bazelOut" \
--output_user_root="$bazelUserRoot" \
build \
-j $NIX_BUILD_CORES \
"''${copts[@]}" \
"''${host_copts[@]}" \
"''${linkopts[@]}" \
"''${host_linkopts[@]}" \
$bazelFlags \
$bazelTarget
runHook postBuild
'';
})