#!/bin/bash
#
# Copyright 2019 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Verify handling of Unicode filenames.

# --- begin runfiles.bash initialization ---
set -euo pipefail
if [[ ! -d "${RUNFILES_DIR:-/dev/null}" && ! -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
  if [[ -f "$0.runfiles_manifest" ]]; then
    export RUNFILES_MANIFEST_FILE="$0.runfiles_manifest"
  elif [[ -f "$0.runfiles/MANIFEST" ]]; then
    export RUNFILES_MANIFEST_FILE="$0.runfiles/MANIFEST"
  elif [[ -f "$0.runfiles/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
    export RUNFILES_DIR="$0.runfiles"
  fi
fi
if [[ -f "${RUNFILES_DIR:-/dev/null}/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
  source "${RUNFILES_DIR}/bazel_tools/tools/bash/runfiles/runfiles.bash"
elif [[ -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
  source "$(grep -m1 "^bazel_tools/tools/bash/runfiles/runfiles.bash " \
            "$RUNFILES_MANIFEST_FILE" | cut -d ' ' -f 2-)"
else
  echo >&2 "ERROR: cannot find @bazel_tools//tools/bash/runfiles:runfiles.bash"
  exit 1
fi
# --- end runfiles.bash initialization ---

source "$(rlocation "io_bazel/src/test/shell/integration_test_setup.sh")" \
  || { echo "integration_test_setup.sh not found!" >&2; exit 1; }

case "$(uname -s | tr [:upper:] [:lower:])" in
msys*|mingw*|cygwin*)
  declare -r is_windows=true
  ;;
*)
  declare -r is_windows=false
  ;;
esac

if "$is_windows"; then
  export MSYS_NO_PATHCONV=1
  export MSYS2_ARG_CONV_EXCL="*"
fi

#### SETUP #############################################################

function unicode_filenames_test_setup() {
  touch WORKSPACE
  mkdir -p pkg/srcs

  cat >pkg/BUILD <<'EOF'
load(":rules.bzl", "ls_srcs")
ls_srcs(
  name = "ls_srcs",
  srcs = glob(["srcs/**/*"]),
)
EOF

  cat >pkg/rules.bzl <<'EOF'
def _ls_srcs(ctx):
  out = ctx.actions.declare_file(ctx.attr.name)
  ctx.actions.run_shell(
    inputs = ctx.files.srcs,
    outputs = [out],
    command = 'find -L . > "$1"',
    arguments = [out.path],
  )
  return DefaultInfo(
    files = depset(direct = [out]),
  )

ls_srcs = rule(
  _ls_srcs,
  attrs = {"srcs": attr.label_list(allow_files = True)},
)
EOF
}

function has_iso_8859_1_locale() {
  charmap="$(LC_ALL=en_US.ISO-8859-1 locale charmap 2>/dev/null)"
  [[ "${charmap}" == "ISO-8859-1" ]]
}

function has_utf8_locale() {
  charmap="$(LC_ALL=en_US.UTF-8 locale charmap 2>/dev/null)"
  [[ "${charmap}" == "UTF-8" ]]
}

function test_utf8_source_artifact() {
  # Bazel relies on the JVM for filename encoding, and can only support
  # UTF-8 if either a UTF-8 or ISO-8859-1 locale is available.
  if ! "$is_windows"; then
    if ! has_iso_8859_1_locale && ! has_utf8_locale; then
      echo "Skipping test (no ISO-8859-1 or UTF-8 locale)."
      echo "Available locales (need ISO-8859-1 or UTF-8):"
      locale -a
      return
    fi
  fi

  unicode_filenames_test_setup

  touch 'pkg/srcs/regular file.txt'

  mkdir pkg/srcs/subdir
  touch 'pkg/srcs/subdir/file.txt'

  # >>> u"pkg/srcs/ünïcödë fïlë.txt".encode("utf8")
  # 'pkg/srcs/\xc3\xbcn\xc3\xafc\xc3\xb6d\xc3\xab f\xc3\xafl\xc3\xab.txt'
  touch "$(printf '%b' 'pkg/srcs/\xc3\xbcn\xc3\xafc\xc3\xb6d\xc3\xab f\xc3\xafl\xc3\xab.txt')"

  # On systems without an ISO-8859-1 locale, the environment locale must be
  # the same as the file encoding.
  #
  # This doesn't affect systems that do have an ISO-8859-1 locale, because the
  # Bazel launcher will force it to be used.
  bazel shutdown
  LC_ALL=en_US.UTF-8 bazel build //pkg:ls_srcs >$TEST_log 2>&1 || fail "Should build"
  bazel shutdown

  assert_contains "pkg/srcs/regular file.txt" bazel-bin/pkg/ls_srcs
  assert_contains "pkg/srcs/subdir/file.txt" bazel-bin/pkg/ls_srcs
  assert_contains "pkg/srcs/ünïcödë fïlë.txt" bazel-bin/pkg/ls_srcs
}

function test_traditional_encoding_source_artifact() {
  # Windows and macOS require filesystem paths to be valid Unicode. Linux and
  # the traditional BSDs typically don't, so their paths can contain arbitrary
  # non-NUL bytes.
  case "$(uname -s | tr [:upper:] [:lower:])" in
  linux|freebsd)
    ;;
  *)
    echo "Skipping test." && return
    ;;
  esac

  # Bazel relies on the JVM for filename encoding, and can only support
  # traditional encodings if it can roundtrip through ISO-8859-1.
  if ! has_iso_8859_1_locale; then
    echo "Skipping test (no ISO-8859-1 locale)."
    echo "Available locales (need en_US.ISO-8859-1):"
    locale -a
    return
  fi

  unicode_filenames_test_setup

  # >>> u"pkg/srcs/TRADITIONAL ünïcödë fïlë.txt".encode("iso-8859-1")
  # 'pkg/srcs/TRADITIONAL \xfcn\xefc\xf6d\xeb f\xefl\xeb.txt'
  touch "$(printf '%b' 'pkg/srcs/TRADITIONAL \xfcn\xefc\xf6d\xeb f\xefl\xeb.txt')"

  bazel build //pkg:ls_srcs >$TEST_log 2>&1 || fail "Should build"
  assert_contains "pkg/srcs/TRADITIONAL " bazel-bin/pkg/ls_srcs
}

run_suite "Tests for handling of Unicode filenames"