76 lines
2.7 KiB
Python
76 lines
2.7 KiB
Python
# Copyright 2016 Ian Wienand (iwienand@redhat.com)
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import os.path
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import runpy
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import sys
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import diskimage_builder.paths
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# borrowed from pip:locations.py
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def running_under_virtualenv():
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"""Return True if we're running inside a virtualenv, False otherwise."""
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if hasattr(sys, 'real_prefix'):
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return True
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elif sys.prefix != getattr(sys, "base_prefix", sys.prefix):
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return True
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return False
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def activate_venv():
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if running_under_virtualenv():
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activate_this = os.path.join(sys.prefix, "bin", "activate_this.py")
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globs = runpy.run_path(activate_this, globals())
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globals().update(globs)
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del globs
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def main():
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# If we are called directly from a venv install
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# (/path/venv/bin/disk-image-create) then nothing has added the
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# virtualenv bin/ dir to $PATH. the exec'd script below will be
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# unable to find call other dib tools like dib-run-parts.
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#
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# One solution is to say that you should only ever run
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# disk-image-create in a shell that has already sourced
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# bin/activate.sh (all this really does is add /path/venv/bin to
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# $PATH). That's not a great interface as resulting errors will
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# be very non-obvious.
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#
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# We can detect if we are running in a virtualenv and use
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# virtualenv's "activate_this.py" script to activate it ourselves
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# before we call the script. This ensures we have the path setting
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activate_venv()
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environ = os.environ
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# pre-seed some paths for the shell script
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environ['_LIB'] = diskimage_builder.paths.get_path('lib')
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# export the path to the current python
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if not os.environ.get('DIB_PYTHON_EXEC'):
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os.environ['DIB_PYTHON_EXEC'] = sys.executable
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# we have to handle being called as "disk-image-create" or
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# "ramdisk-image-create". ramdisk-iamge-create is just a symlink
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# to disk-image-create
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# XXX: we could simplify things by removing the symlink, and
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# just setting IS_RAMDISK in environ here depending on sys.argv[1]
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script = "%s/%s" % (diskimage_builder.paths.get_path('lib'),
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os.path.basename(sys.argv[0]))
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os.execve("/bin/bash", ['bash', script] + sys.argv[1:], environ)
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