def check_prerequisites(self):
"""Check if required prerequisites are installed or available."""
status_command = 'pip --version > /dev/null 2>&1'
not_found = subprocess.call(status_command,
**self.subprocess_args(shell=True)) == 127
if not_found:
raise base_installer.MissingPrerequisiteError(
'The `pip` command was not found.')
def _check_prerequisites_yarn(self):
"""Check if required prerequisites are installed or available."""
status_command = 'yarn --version > /dev/null 2>&1'
not_found = subprocess.call(status_command,
**self.subprocess_args(shell=True)) == 127
if not_found:
install_commands = [
'Install yarn from https://yarnpkg.com/en/docs/install'
]
raise base_installer.MissingPrerequisiteError(
'The `yarn` command was not found.',
install_commands=install_commands)
def check_prerequisites(self):
"""Check if required prerequisites are installed or available."""
status_command = 'nvm --version > /dev/null 2>&1'
not_found = subprocess.call(status_command,
**self.subprocess_args(shell=True)) == 127
if not_found:
install_commands = [
'Download nvm from https://github.com/creationix/nvm'
]
raise base_installer.MissingPrerequisiteError(
'The `nvm` command was not found.',
install_commands=install_commands)
def check_prerequisites(self):
"""Check if required prerequisites are installed or available."""
status_command = 'gulp --version > /dev/null 2>&1'
not_found = subprocess.call(status_command,
**self.subprocess_args(shell=True)) == 127
if not_found:
install_commands = [
'Either add gulp to package.json or install globally using:'
' `sudo npm install -g gulp`'
]
raise base_installer.MissingPrerequisiteError(
'The `gulp` command was not found.',
install_commands=install_commands)
def _check_prerequisites_npm(self):
"""Check if required prerequisites are installed or available."""
status_command = self._nvm_command('npm --version > /dev/null 2>&1')
not_found = subprocess.call(status_command,
**self.subprocess_args(shell=True)) == 127
if not_found:
install_commands = []
if sdk_utils.PLATFORM == 'linux':
install_commands.append(
'On Linux, you can install npm using: `apt-get install nodejs`'
)
elif sdk_utils.PLATFORM == 'mac':
install_commands.append(
'Using brew (https://brew.sh), you can install using: `brew install node`'
)
install_commands.append(
('If you do not have brew, you can download '
'Node.js from https://nodejs.org'))
else:
install_commands.append(
'Download Node.js from https://nodejs.org')
raise base_installer.MissingPrerequisiteError(
'The `npm` command was not found.',
install_commands=install_commands)