ee46e2f9b7
Make a version-less RHEL element to handle both '7' and '8' DIB_RELEASE.
The element usage should align with other elements which operate in the
same way such as the Fedora element.
Additionally, this patch adds support for RHEL8 that operates with
Python 3.
As of now, users of diskimage-builder will still be able to use the
'rhel7' element, or migrate to 'rhel' and specify their respective
DIB_RELEASE value.
* mount the xfs file-system for extraction as read-only. vaguely
based on explaination in [1] and the fact we only read the image
data into a tar, so can ignore this.
XFS (dm-1): Superblock has unknown read-only compatible features (0x4) enabled.
* Use the redhat system python as the dib-python version. dib was
ahead of it's time making an abstracted python interpreter for
system work ;) the system python should work for running the various
dib element scripts.
[1] https://unix.stackexchange.com/questions/247550/unmountable-xfs-filesystem
Redhat-Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1700253
Co-Authored-By: Ian Wienand <iwienand@redhat.com>
Change-Id: I90540675c70bb475d9db2ae24f81c648a31f3f95
dib-python
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.
Note
The dib-python interpreter will be removed in
cleanup.d. It is only intended for build scripts.