More CI (#3)

- ci only: use a separate zig cache dir for each run
- use `tools/bazel` everywhere.
- remove arm64 tests. They don't give enough value to be worth the
  brittle environment.
- remove windows execution, except for launcher. Ditto. I will probably
  bring them back.

ci/launcher

@@ -5,8 +5,10 @@
 
 set -xeuo pipefail
 
-ZIG=${ZIG:-$(bazel run "$@" --run_under=echo @zig_sdk//:zig)}
+echo "--- which zig"
+ZIG=${ZIG:-$(tools/bazel run "$@" --run_under=echo @zig_sdk//:zig)}
 
+echo "--- compile launcher.zig for various architectures"
 for target in \
     aarch64-linux-gnu.2.19 \
     aarch64-macos-none \
@@ -17,15 +19,9 @@ do
     $ZIG build-exe -fno-emit-bin -target $target toolchain/launcher.zig
 done
 
+echo "--- zig fmt --check toolchain/launcher.zig"
 $ZIG fmt --check toolchain/launcher.zig
 
+echo "--- zig test toolchain/launcher.zig"
 # until bazel-zig-cc gets a zig toolchain, run launcher's unit tests here.
 $ZIG test toolchain/launcher.zig
-
-# ReleaseSafe because of https://github.com/ziglang/zig/issues/14036
-$ZIG test \
-    -OReleaseSafe \
-    -target x86_64-windows-gnu \
-    --test-cmd wine64-stable \
-    --test-cmd-bin \
-    toolchain/launcher.zig

ci/launcher-wine64

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
+set -xeuo pipefail
+
+echo "--- which zig"
+ZIG=${ZIG:-$(tools/bazel run "$@" --run_under=echo @zig_sdk//:zig)}
+
+echo "--- test toolchain/launcher.zig via wine64"
+# ReleaseSafe because of https://github.com/ziglang/zig/issues/14036
+$ZIG test \
+    -OReleaseSafe \
+    -target x86_64-windows-gnu \
+    --test-cmd wine64-stable \
+    --test-cmd-bin \
+    toolchain/launcher.zig

ci/list_toolchains_platforms

@@ -7,13 +7,13 @@ set -euo pipefail
 
 indent() { sed 's/^/    /'; }
 
-echo "Available toolchains:"
-bazel query --noshow_progress '@zig_sdk//toolchain:*' | indent
-echo "Available platforms:"
-bazel query --noshow_progress '@zig_sdk//platform:*' | indent
-echo "Available libc aware toolchains:"
-bazel query --noshow_progress '@zig_sdk//libc_aware/toolchain:*' | indent
-echo "Available libc aware platforms:"
-bazel query --noshow_progress '@zig_sdk//libc_aware/platform:*' | indent
-echo "Available libc variants:"
-bazel query --noshow_progress "attr(constraint_setting, @zig_sdk//libc:variant, @zig_sdk//...)" | indent
+echo "--- Available toolchains:"
+tools/bazel query --noshow_progress '@zig_sdk//toolchain:*' | indent
+echo "--- Available platforms:"
+tools/bazel query --noshow_progress '@zig_sdk//platform:*' | indent
+echo "--- Available libc aware toolchains:"
+tools/bazel query --noshow_progress '@zig_sdk//libc_aware/toolchain:*' | indent
+echo "--- Available libc aware platforms:"
+tools/bazel query --noshow_progress '@zig_sdk//libc_aware/platform:*' | indent
+echo "--- Available libc variants:"
+tools/bazel query --noshow_progress "attr(constraint_setting, @zig_sdk//libc:variant, @zig_sdk//...)" | indent

ci/test

@@ -5,24 +5,26 @@
 
 set -xeuo pipefail
 
-BAZEL_ZIG_CC_CACHE_PREFIX=${BAZEL_ZIG_CC_CACHE_PREFIX:-/tmp/bazel-zig-cc}
-mkdir -p "${BAZEL_ZIG_CC_CACHE_PREFIX}"
-
 # check a very hermetic setup with a single target. Re-building all of
 # them takes a long time, so using only one. If we ever decide to build all
 # targets, we will need to exclude Go, since go dynamically links to glibc on
 # linux.
-bazel build "$@" \
+echo "--- build a single target with very hermetic sandbox"
+tools/bazel build "$@" \
     --experimental_use_hermetic_linux_sandbox \
     --sandbox_add_mount_pair=/proc \
     //test/c:which_libc_linux_amd64_gnu.2.19
 
 # then test everything else with the standard sandbox
-bazel test "$@" ...
+echo "--- bazel test $@ ..."
+tools/bazel test "$@" ...
 
-# Ensure that github.com/ziglang/zig/issues/13050 does not regress
-find "$BAZEL_ZIG_CC_CACHE_PREFIX" -name mutex_destructor.o -execdir file '{}' \; | \
-    sort | uniq -c | sort -rn > /tmp/got_cache
+echo "--- ensure github.com/ziglang/zig/issues/13050 does not regress"
+find "${BAZEL_ZIG_CC_CACHE_PREFIX:-/tmp/bazel-zig-cc}" \
+    -name mutex_destructor.o -execdir file '{}' \; \
+    | sort \
+    | uniq -c \
+    | sort -rn > /tmp/got_cache
 
 diff -u ci/testdata/want_cache /tmp/got_cache || {
     >&2 echo "ERROR: unexpected artifacts. This is TODO."