def build_from_spec(spec_file=None,
build_dir=None,
build_folder=False,
sandbox=False,
isolated=False,
debug=False):
'''build_from_spec will build a "spec" file in a "build_dir" and return the directory
:param spec_file: the spec file, called "Singuarity"
:param build_dir: the directory to build in. If not defined, will use tmpdir.
:param isolated: "build" the image inside an isolated environment (>2.4)
:param sandbox: ask for a sandbox build
:param debug: ask for verbose output from builder
'''
if spec_file == None:
spec_file = "Singularity"
if build_dir == None:
build_dir = tempfile.mkdtemp()
bot.debug("Building in directory %s" %build_dir)
# Copy the spec to a temporary directory
bot.debug("Spec file set to %s" % spec_file)
spec_path = os.path.abspath(spec_file)
bot.debug("Spec file for build should be in %s" %spec_path)
image_path = "%s/build.simg" %(build_dir)
# Run create image and bootstrap with Singularity command line tool.
cli = Singularity(debug=debug)
print("\nBuilding image...")
# Does the user want to "build" into a folder or image?
result = cli.build(image_path=image_path,
spec_path=spec_path,
sandbox=sandbox,
isolated=isolated)
print(result)
# If image, rename based on hash
if sandbox is False:
version = get_image_file_hash(image_path)
final_path = "%s/%s.simg" %(build_dir,version)
os.rename(image_path,final_path)
image_path = final_path
bot.debug("Built image: %s" %image_path)
return image_path
from singularity.cli import Singularity
# Create a client
S = Singularity()
# Get general help:
S.help()
# These are the defaults, which can be specified
S = Singularity(sudo=False, debug=False)
# Note that the "create" and "import" workflow is deprecated in favor of build
# https://singularityware.github.io/docs-build
image = S.build('myimage.simg', 'docker://ubuntu:latest') # requires sudo
# (Deprecated) create an image and import into it
image = S.create('myimage.simg')
S.importcmd(image, 'docker://ubuntu:latest')
# Execute command to container
result = S.execute(image, command='cat /singularity')
print(result)
'''
'#!/bin/sh\n\nexec "/bin/bash"\n'
'''
# For any function you can get the docs:
S.help(command="exec")