mirror of
https://github.com/kennethreitz/heroku-buildpack-python.git
synced 2026-06-05 23:10:16 +00:00
Kenneth Reitz
245 lines
6.1 KiB
Bash
Executable File
245 lines
6.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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# This script serves as the
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# [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
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# compiler.
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#
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# A [buildpack](http://devcenter.heroku.com/articles/buildpacks) is an
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# adapter between a Python application and Heroku's runtime.
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#
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# You can intreract with the Heroku API directly with [heroku.py](https://github.com/heroku/heroku.py/).
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#
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# See also: [Release history](/changelog.html), [Detection](/detect.html).
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#
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# ## Usage
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# Compiling an app into a slug is simple:
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#
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# $ bin/compile <build-dir> <cache-dir>
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# ## Assumptions
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#
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# This buildpack makes the following assumptions:
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#
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# - The desired Python VM is available on the base system.
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# - Library dependencies are available on the base system.
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# - Django applications should not require any platform-specific configuration.
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# <hr />
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# ## Context
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# Fail fast and fail hard.
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set -eo pipefail
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# Prepend proper path for virtualenv hackery. This will be deprecated soon.
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export PATH=:/usr/local/bin:$PATH
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# Paths.
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BIN_DIR=$(cd $(dirname $0); pwd) # absolute path
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ROOT_DIR=$(dirname $BIN_DIR)
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BUILD_DIR=$1
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CACHE_DIR=$2
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# Where to store the pip download cache.
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CACHED_DIRS=".heroku"
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PIP_DOWNLOAD_CACHE=${PIP_DOWNLOAD_CACHE:-$CACHE_DIR/pip_downloads}
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# Static configurations for virtualenv caches.
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VIRTUALENV_LOC=".heroku/venv"
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LEGACY_TRIGGER="lib/python2.7"
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PROFILE_PATH="$BUILD_DIR/.profile.d/python.sh"
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# Python version. This will be used in the future to specify custom Pythons.
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DEFAULT_PYTHON_VERSION="python-2.6.3"
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PYTHON_EXE="/app/.heroku/python/bin/python"
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# Sanitizing environment variables.
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unset GIT_DIR PYTHONHOME PYTHONPATH LD_LIBRARY_PATH LIBRARY_PATH
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# We'll need to send these statics to other scripts we `source`.
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export PIP_DOWNLOAD_CACHE BUILD_DIR CACHE_DIR BIN_DIR PROFILE_PATH
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# Syntax sugar.
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source $BIN_DIR/utils
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# Directory Hacks for path consistiency.
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APP_DIR='/app'
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TMP_APP_DIR=$CACHE_DIR/tmp_app_dir
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ls -a $APP_DIR
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ls -a $APP_DIR/tmp
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echo 'touching things...'
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touch $app_dir/tmp/newfile
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mkdir -p $app_dir/tmp/newdir
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# Copy Anvil app dir to temporary storage...
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mkdir -p $TMP_APP_DIR
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deep-mv $APP_DIR $TMP_APP_DIR
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# Copy Application code in.
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deep-mv $BUILD_DIR $APP_DIR
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# Set new context.
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ORIG_BUILD_DIR=$BUILD_DIR
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BUILD_DIR=$APP_DIR
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# Prepend proper path buildpack use.
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export PATH=$BUILD_DIR/.heroku/python/bin:$PATH
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# ls $BUILD_DIR
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# ## Build Time
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#
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# Switch to the repo's context.
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cd $BUILD_DIR
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# Experimental pre_compile hook.
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source $BIN_DIR/steps/hooks/pre_compile
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# If no requirements given, assume `setup.py develop`.
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if [ ! -f requirements.txt ]; then
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puts-step "No requirements.txt provided; assuming dist package."
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echo "-e ." > requirements.txt
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fi
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# If no runtime given, assume default version.
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if [ ! -f runtime.txt ]; then
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puts-step "No runtime.txt provided; assuming $DEFAULT_PYTHON_VERSION."
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echo $DEFAULT_PYTHON_VERSION > runtime.txt
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fi
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# ### The Cache
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mkdir -p $CACHE_DIR
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[ ! "$(ls -A $CACHE_DIR)" ] && export FRESH_APP=1
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# Purge "old-style" virtualenvs.
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[ -d $CACHE_DIR/$LEGACY_TRIGGER ] && rm -fr $CACHE_DIR/*
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# Restore old artifacts from the cache.
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for dir in $CACHED_DIRS; do
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cp -R $CACHE_DIR/$dir . &> /dev/null || true
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done
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set +e
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# Create set-aside `.heroku` folder.
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mkdir .heroku &> /dev/null
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set -e
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# Buildpack profile init script
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mkdir -p $(dirname $PROFILE_PATH)
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# ### Virtualenv Setup
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#
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# Create the virtualenv. Rebuild if corrupt.
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# TODO: Bootstrap a bottled Python VM...
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set +e
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PYTHON_VERSION=$(cat runtime.txt)
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puts-step "Preparing Python runtime ($PYTHON_VERSION)"
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# Install Python.
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if [ -f .heroku/python-version ]; then
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if [ ! $(cat .heroku/python-version) = $PYTHON_VERSION ]; then
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puts-step "Found $(cat .heroku/python-version), removing."
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rm -fr .heroku/python
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else
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SKIP_INSTALL=1
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fi
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fi
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if [ ! "$SKIP_INSTALL" ]; then
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puts-step "Installing runtime $PYTHON_VERSION"
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curl http://envy-versions.s3.amazonaws.com/$PYTHON_VERSION.tar.bz2 | tar jx
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mv python .heroku/python
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# Record for future reference.
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echo $PYTHON_VERSION > .heroku/python-version
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# Prepare it for the real world
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# curl -O http://python-distribute.org/distribute_setup.py
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echo path
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echo $PATH
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ls /app/.heroku/python/bin
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hash -r
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which python
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python $ROOT_DIR/vendor/distribute-0.6.31/setup.py install
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echo
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echo
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echo
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ls /app/.heroku/python/bin
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echo
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echo
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hash -r
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python $ROOT_DIR/vendor/pip-1.2.1/setup.py install
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fi
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# puts-step "Creating Virtualenv ($(virtualenv --version))"
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# # Try to create the virtualenv.
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# OUT=$(virtualenv --python $PYTHON_EXE --distribute --never-download --prompt='(venv) ' $VIRTUALENV_LOC 2>&1)
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# [ $? -ne 0 -o -n "$CLEAN_VIRTUALENV" ] && {
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# if [ -n "$CLEAN_VIRTUALENV" ]
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# then echo " ! CLEAN_VIRTUALENV set, rebuilding virtualenv."
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# else echo " ! Virtualenv corrupt, rebuilding."
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# fi
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# rm -fr $VIRTUALENV_LOC &> /dev/null || true
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# OUT=$(virtualenv --python $PYTHON_EXE --distribute --never-download --prompt='(venv) ' $VIRTUALENV_LOC )
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# }
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# echo "$OUT" | cleanup | indent
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set -e
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# Pylibmc support.
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# See [`bin/steps/pylibmc`](pylibmc.html).
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source $BIN_DIR/steps/pylibmc
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# Install Mercurial if it appears to be required.
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if (grep -Fiq "hg+" requirements.txt) then
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pip install --use-mirrors mercurial | cleanup | indent
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fi
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# Install dependencies with Pip.
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puts-step "Installing dependencies using pip ($(pip --version | awk '{print $2}'))"
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pip install --use-mirrors -r requirements.txt --exists-action=w --src=./.heroku/src | cleanup | indent
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# Django collectstatic support.
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source $BIN_DIR/steps/collectstatic
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# ### Finalize
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#
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python --version
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# Store new artifacts in cache.
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for dir in $CACHED_DIRS; do
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rm -rf $CACHE_DIR/$dir
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cp -R $dir $CACHE_DIR/
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done
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# Set context environment variables.
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set-env PATH '$HOME/.heroku/venv/bin:$PATH'
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set-default-env PYTHONUNBUFFERED true
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set-default-env LIBRARY_PATH /app/.heroku/vendor/lib
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set-default-env LD_LIBRARY_PATH /app/.heroku/vendor/lib
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set-default-env LANG en_US.UTF-8
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set-default-env PYTHONHASHSEED random
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set-default-env PYTHONHOME /app/.heroku/venv/
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set-default-env PYTHONPATH /app/
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# ### Fin.
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deep-mv $BUILD_DIR $ORIG_BUILD_DIR
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deep-mv $TMP_APP_DIR $APP_DIR
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# Experimental post_compile hook.
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source $BIN_DIR/steps/hooks/post_compile
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