Separate bootstrap from envsetup.
'. env_setup/bootstrap.sh' will do a full install and setup of all
packages while '. env_setup/env_setup.sh' will check for installation
and only run setup if necessary. Both will set all appropriate
enviroment variables.
How 'full' vs 'check' is implemented depends on the thing being setup.
Since CIPD is very fast it treats them the same, but since virtualenv
and pip install are slow it checks to see if all packages are installed
and only installs if some are missing. It does not check versions.
Since users previously ran '. env_setup/setup.sh', that path is
preserved as a symlink.
Change-Id: Icef50d44efe579fdb3dcebe31da37453452f07ca
Bug: 42
diff --git a/env_setup/env_setup.sh b/env_setup/env_setup.sh
new file mode 100644
index 0000000..bed3fbd
--- /dev/null
+++ b/env_setup/env_setup.sh
@@ -0,0 +1,72 @@
+# Copyright 2019 The Pigweed Authors
+#
+# 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
+#
+# https://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.
+
+# This script must be tested on bash, zsh, and dash.
+
+function _abspath () {
+ python -c "import os.path; print(os.path.abspath('$@'))"
+}
+
+# Shell: bash.
+if test -n "$BASH"; then
+ PW_SETUP_SCRIPT_PATH=$(_abspath $BASH_SOURCE)
+# Shell: zsh.
+elif test -n "$ZSH_NAME"; then
+ PW_SETUP_SCRIPT_PATH=$(_abspath ${(%):-%N})
+# Shell: dash.
+elif test ${0##*/} = dash; then
+ PW_SETUP_SCRIPT_PATH=$(_abspath \
+ $(lsof -p $$ -Fn0 | tail -1 | sed 's#^[^/]*##;'))
+# If everything else fails, try $0. It could work.
+else
+ PW_SETUP_SCRIPT_PATH=$(_abspath $0)
+fi
+
+PW_ENVSETUP=$(dirname $PW_SETUP_SCRIPT_PATH)
+export PW_ENVSETUP
+
+PW_ROOT=$(dirname "$PW_ENVSETUP")
+export PW_ROOT
+
+unset ABORT_PW_ENVSETUP
+unset PW_ENVSETUP_FULL
+
+if [[ $(basename $PW_SETUP_SCRIPT_PATH) == "bootstrap.sh" ]]; then
+ PW_ENVSETUP_FULL=1
+ export PW_ENVSETUP_FULL
+fi
+
+# Initialize CIPD.
+. "$PW_ENVSETUP/cipd/init.sh"
+
+# Check that Python 3 comes from CIPD.
+if [[ -z "$ABORT_PW_ENVSETUP" ]]; then
+ if [[ $(which python3) != *"cipd"* ]]; then
+ echo "Python not from CIPD--found $(which python3) instead" 1>&2
+ ABORT_PW_ENVSETUP=1
+ fi
+fi
+
+# Initialize Python 3 virtual environment.
+if [[ -z "$ABORT_PW_ENVSETUP" ]]; then
+ . "$PW_ENVSETUP/virtualenv/init.sh"
+fi
+
+if [[ -n "$ABORT_PW_ENVSETUP" ]]; then
+ echo "Environment setup failed! Please see messages above." 1>&2
+fi
+
+# Unset this at the end so users running setup scripts directly get consistent
+# behavior.
+unset PW_ENVSETUP_FULL