#!/bin/sh
# Copyright 2023 Huawei Cloud Computing Technology Co., Ltd.
#
# 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.


set -eu

readonly JUST="${PWD}/bin/tool-under-test"
readonly LBR="${TEST_TMPDIR}/local-build-root"
readonly TOOLS_DIR="${TEST_TMPDIR}/tools"
readonly OUT="${TEST_TMPDIR}/out"
BUILD_ARGS="--local-build-root ${LBR}"
if [ -n "${COMPATIBLE:-}" ]; then
  BUILD_ARGS="$BUILD_ARGS --compatible"
fi

# Have tools in the "outside environment" to later demonstrate
# that the action was _not_ rerun.
mkdir -p "${TOOLS_DIR}"
cat > "${TOOLS_DIR}/tree" <<'EOF'
#!/bin/sh
mkdir -p $1/hello/world/tree
echo Hello World > $1/hello/world/tree/hello.txt
echo -n World > $1/hello/world/tree/name.txt
EOF
chmod 755 "${TOOLS_DIR}/tree"
cat > "${TOOLS_DIR}/large" <<'EOF'
#!/bin/sh
for _ in `seq 1 10000`
do
  echo This is a really large file 1234567890 >> $1
done
EOF
chmod 755 "${TOOLS_DIR}/large"


touch WORKSPACE
cat > TARGETS <<'EOF'
{ "large":
  { "type": "generic"
  , "arguments_config": ["ENV"]
  , "outs": ["out.txt"]
  , "cmds": ["${TOOLS}/large out.txt"]
  , "env": {"type": "var", "name": "ENV"}
  }
, "tree":
  { "type": "generic"
  , "arguments_config": ["ENV"]
  , "out_dirs": ["out"]
  , "cmds": ["${TOOLS}/tree out"]
  , "env": {"type": "var", "name": "ENV"}
  }
, "": {"type": "install", "dirs": [["large", "out"], ["tree", "out"]]}
}
EOF

cat TARGETS

# Build to fill the cache
"${JUST}" build ${BUILD_ARGS} -L '["env", "PATH='"${PATH}"'"]' \
          -D '{"ENV": {"TOOLS": "'${TOOLS_DIR}'"}}' 2>&1

# Demonstrate that from now on, we don't build anything any more
rm -rf "${TOOLS_DIR}"

# Verify the large file is in cache
"${JUST}" install ${BUILD_ARGS} -L '["env", "PATH='"${PATH}"'"]' -o "${OUT}/out-large" \
          -D '{"ENV": {"TOOLS": "'${TOOLS_DIR}'"}}' large 2>&1
wc -c "${OUT}/out-large/out.txt"
test $(cat "${OUT}/out-large/out.txt" | wc -c) -gt 100000

# Now test non-rotating gc; this does not affect how far the
# cache. At the end, we also repeat it serveral time to demontstrate
# that things don't fall out of cache.

LEFT_OVER_REMOVE_DIR="${LBR}/protocol-dependent/remove-me-$$-xxx"
EPHEMERAL_DIR="${LBR}/protocol-dependent/generation-0/ephemeral"

mkdir -p "${LEFT_OVER_REMOVE_DIR}/xxx"
mkdir -p "${EPHEMERAL_DIR}/xxx"

"${JUST}" gc --local-build-root "${LBR}" --no-rotate 2>&1

echo "Checking that ${EPHEMERAL_DIR} was removed"
[ -e "${EPHEMERAL_DIR}" ] && exit 1 || :
echo "Checking that ${LEFT_OVER_REMOVE_DIR} was removed"
[ -e "${LEFT_OVER_REMOVE_DIR}" ] && exit 1 || :

"${JUST}" gc --local-build-root "${LBR}" --no-rotate 2>&1
"${JUST}" gc --local-build-root "${LBR}" --no-rotate 2>&1

# collect garbage
"${JUST}" gc --local-build-root "${LBR}" 2>&1

# Use the tree
"${JUST}" build ${BUILD_ARGS} -L '["env", "PATH='"${PATH}"'"]' \
          -D '{"ENV": {"TOOLS": "'${TOOLS_DIR}'"}}' tree 2>&1

# collect garbage again
"${JUST}" gc --local-build-root "${LBR}" 2>&1

# Verify the build root is now small
tar cvf "${OUT}/root.tar" "${LBR}" 2>&1
wc -c "${OUT}/root.tar"
test $(cat "${OUT}/root.tar" | wc -c) -lt 100000

# Verify that the tree is fully in cache
"${JUST}" install ${BUILD_ARGS} -L '["env", "PATH='"${PATH}"'"]' -o "${OUT}/out-tree" \
          -D '{"ENV": {"TOOLS": "'${TOOLS_DIR}'"}}' tree 2>&1
ls -R "${OUT}/out-tree"
test -f "${OUT}/out-tree/out/hello/world/tree/hello.txt"
test -f "${OUT}/out-tree/out/hello/world/tree/name.txt"
test "$(cat "${OUT}/out-tree/out/hello/world/tree/name.txt")" = "World"

# check if all files in generation 0 have been linked and not copied
readonly NON_LINKED_FILES=$(find ${LBR}/protocol-dependent/generation-0 -type f -exec sh -c 'test $(stat -c %h {}) != 2' \; -print)
echo
echo "Files with link count!=2:"
echo "${NON_LINKED_FILES:-"<none>"}"
echo
test -z "${NON_LINKED_FILES}"

echo OK