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Install pip with python interpreter

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Currently we install pip/virtualenv with "/usr/local/bin/dib-python".
This means that every time you create a virtualenv, the python
interpreter inside it is called "dib-python" which is confusing.

Add an env var DIB_PYTHON that points directly the to interpreter
available during build, for use when running scripts.

Change-Id: I88ad3c9eb958d58db4631d9b27bc2c592f970345
This commit is contained in:
Ian Wienand 2017-04-11 10:38:22 +10:00
parent 5c1579f0d6
commit ffd4820d59
3 changed files with 25 additions and 8 deletions
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22
diskimage_builder/elements/dib-python/README.rst
View File

@ -2,11 +2,23 @@
dib-python
==========
Adds a symlink to /usr/local/bin/dib-python which points at either a python2
or python3 executable. This is useful for creating #! lines for scripts that
are compatible with both python2 and python3.
Adds a symlink to `/usr/local/bin/dib-python` which points at either a
`python2` or `python3` executable as appropriate.
In-chroot scripts should use this as their interpreter
(`#!/usr/local/bin/dib-python`) to make scripts that are compatible
with both `python2` and `python3`. We can not assume
`/usr/bin/python` exists, as some platforms have started shipping with
only Python 3.
`DIB_PYTHON` will be exported as the python interpreter. You should
use this instead of `python script.py` (e.g. `${DIB_PYTHON}
script.py`). Note you can also call `/usr/local/bin/dib-python
script.py` but in some circumstances, such as creating a `virtualenv`,
it can create somewhat confusing references to `dib-python` that
remain in the built image.
This does not install a python if one does not exist, and instead fails.
This also exports a variable DIB_PYTHON_VERSION which will either be '2' or
'3' depending on the python version which dib-python points to.
This also exports a variable `DIB_PYTHON_VERSION` which will either be
'2' or '3' depending on the python version which dib-python points to.

5
diskimage_builder/elements/dib-python/environment.d/50-dib-python-version
View File

@ -28,3 +28,8 @@ if [ -z "${DIB_PYTHON_VERSION:-}" ]; then
fi
export DIB_PYTHON_VERSION
export DIB_PYTHON=python${DIB_PYTHON_VERSION}
# Local variables:
# mode: sh
# End:

6
diskimage_builder/elements/pip-and-virtualenv/install.d/pip-and-virtualenv-source-install/04-install-pip
View File

@ -22,8 +22,8 @@ if [[ $DISTRO_NAME =~ (opensuse|fedora|centos|centos7|rhel|rhel7) ]]; then
${YUM:-yum} install -y python-virtualenv python-pip python-setuptools
fi
# install pip; this overwrites packaged pip
/usr/local/bin/dib-python /tmp/get-pip.py
# install the latest pip; this overwrites packaged pip
${DIB_PYTHON} /tmp/get-pip.py
# pip and setuptools are closely related; we want to ensure the
# latest for sanity. Because distro packages don't include enough
@ -65,6 +65,6 @@ EOF
echo "exclude=python-virtualenv,python-pip,python-setuptools" >> ${conf}
fi
else
/usr/local/bin/dib-python /tmp/get-pip.py
${DIB_PYTHON} /tmp/get-pip.py
pip install virtualenv
fi