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get-pipsi.py
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get-pipsi.py
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#!/usr/bin/env python
import argparse
import os
import shutil
import sys
from subprocess import call, check_output
import textwrap
try:
WindowsError
except NameError:
IS_WIN = False
PIP = '/bin/pip'
PIPSI = '/bin/pipsi'
else:
IS_WIN = True
PIP = '/Scripts/pip.exe'
PIPSI = '/Scripts/pipsi.exe'
if sys.version_info.major < 3:
try:
import virtualenv # NOQA
venv_pkg = 'virtualenv'
del virtualenv
except ImportError:
venv_pkg = None
else:
venv_pkg = 'venv'
DEFAULT_PIPSI_HOME = os.path.expanduser('~/.local/venvs')
DEFAULT_PIPSI_BIN_DIR = os.path.expanduser('~/.local/bin')
def echo(msg=''):
sys.stdout.write(msg + '\n')
sys.stdout.flush()
def fail(msg):
sys.stderr.write(msg + '\n')
sys.stderr.flush()
sys.exit(1)
def succeed(msg):
echo(msg)
sys.exit(0)
def command_exists(cmd):
with open(os.devnull, 'w') as null:
try:
return call(
[cmd, '--version'],
stdout=null, stderr=null) == 0
except OSError:
return False
def publish_script(venv, bin_dir):
if IS_WIN:
for name in os.listdir(venv + '/Scripts'):
if 'pipsi' in name.lower():
shutil.copy(venv + '/Scripts/' + name, bin_dir)
else:
os.symlink(venv + '/bin/pipsi', bin_dir + '/pipsi')
echo('Installed pipsi binary in ' + bin_dir)
def install_files(venv, bin_dir, install):
try:
os.makedirs(bin_dir)
except OSError:
pass
def _cleanup():
try:
shutil.rmtree(venv)
except (OSError, IOError):
pass
if sys.version_info.major < 3:
executable = sys.executable
else:
executable = get_real_python(sys.executable)
print('sys.executable={} sys.real_prefix={} executable={}'.format(sys.executable, getattr(sys, 'real_prefix', None), executable))
venv_cmd = [executable, '-m', venv_pkg]
if venv_pkg == 'virtualenv':
venv_cmd += ['-p', executable]
venv_cmd += [venv]
if call(venv_cmd) != 0:
_cleanup()
fail('Could not create virtualenv for pipsi :(')
if call([venv + PIP, 'install', install]) != 0:
_cleanup()
fail('Could not install pipsi :(')
publish_script(venv, bin_dir)
def parse_options(argv):
bin_dir = os.environ.get('PIPSI_BIN_DIR', DEFAULT_PIPSI_BIN_DIR)
home_dir = os.environ.get('PIPSI_HOME', DEFAULT_PIPSI_HOME)
parser = argparse.ArgumentParser()
parser.add_argument(
'--bin-dir',
default=bin_dir,
help=(
'Executables will be installed into this folder. '
'Default: %(default)s'
),
)
parser.add_argument(
'--home',
dest='home_dir',
default=home_dir,
help='Virtualenvs are created in this folder. Default: %(default)s',
)
parser.add_argument(
'--src',
default='pipsi',
help=(
'The specific version of pipsi to install. This value is passed '
'to "pip install <value>". For example, to install from master '
'use "git+https://github.com/mitsuhiko/pipsi.git#egg=pipsi". '
'Default: %(default)s'
),
)
parser.add_argument(
'--no-modify-path',
action='store_true',
help='Don\'t configure the PATH environment variable'
)
parser.add_argument(
'--ignore-existing',
action='store_true',
help=(
"ignore versions of pipsi already installed. "
"Use this to ignore a package manager based install or for testing"
),
)
return parser.parse_args(argv)
code_for_get_real_python = (
'import sys; print("{},{}".format('
'getattr(sys, "real_prefix", ""), '
'sys.version_info.major))'
)
def get_real_python(python):
cmd = [python, '-c', code_for_get_real_python]
out = check_output(cmd)
if not isinstance(out, str):
out = out.decode()
real_prefix, major = out.strip().split(',')
if not real_prefix:
return python
for i in [major, '']:
real_python = os.path.join(real_prefix, 'bin', 'python' + i)
if os.path.exists(real_python):
return real_python
raise ValueError('Can not find real python under {}'.format(real_prefix))
def ensure_pipsi_on_path(bin_dir, modify_path):
if not command_exists('pipsi'):
shell = os.environ.get('SHELL', '')
if 'bash' in shell:
config_file = '~/.bashrc'
elif 'zsh' in shell:
config_file = '~/.zshrc'
elif 'fish' in shell:
config_file = '~/.config/fish/config.fish'
else:
config_file = None
if config_file:
config_file = os.path.expanduser(config_file)
if modify_path and os.path.exists(config_file):
with open(config_file, 'a') as f:
f.write('\n# added by pipsi (https://github.com/mitsuhiko/pipsi)\n')
if 'fish' in shell:
f.write('set -x PATH %s $PATH\n\n' % bin_dir)
else:
f.write('export PATH="%s:$PATH"\n' % bin_dir)
echo(
'Added %s to the PATH environment variable in %s' %
(bin_dir, config_file)
)
echo('Open a new terminal to use pipsi')
else:
echo(textwrap.dedent(
'''
%(sep)s
Note:
To finish installation, %(bin_dir)s must be added to your PATH.
This can be done by adding the following line to your shell
config file:
export PATH=%(bin_dir)s:$PATH
%(sep)s
''' % dict(sep='=' * 60, bin_dir=bin_dir)
))
def main(argv=sys.argv[1:]):
args = parse_options(argv)
if command_exists('pipsi') and not args.ignore_existing:
succeed('You already have pipsi installed')
elif os.path.exists(os.path.join(args.bin_dir, 'pipsi')):
ensure_pipsi_on_path(args.bin_dir, not args.no_modify_path)
succeed('pipsi is now installed')
echo('Installing pipsi')
if venv_pkg is None:
fail('You need to have virtualenv installed to bootstrap pipsi.')
venv = os.path.join(args.home_dir, 'pipsi')
install_files(venv, args.bin_dir, args.src)
ensure_pipsi_on_path(args.bin_dir, not args.no_modify_path)
succeed('pipsi is now installed.')
if __name__ == '__main__':
main()