Issue #6643
Updated by mdepaulo@redhat.com over 4 years ago
Consider the following scenario:
1. Pulp 3.2.1 & pulp-file 0.2 were installed.
2. The user runs the latest pulp_installer (3.3), to upgrade pulpcore (3.3), and pulp-file (0.3).
3. The user specifies to install pulp-file in pulp_install_plugins, and includes "upgrade:true ". This instructs the installer to upgrade pulp-file to the latest version, which is currently 0.3.
This causes the following to happen
1. /usr/local/lib/pulp/requirements.txt exists and contains pulp-file==0.2
2. pip-compile sees "pulp-file" in requirements.in that pulp_installer generates, but has no further instructions to upgrade pulp-file.
3. pip-compile produces the following error, and the installer fails:
```
There are incompatible versions in the resolved dependencies:
pulpcore==3.3.0 (from -r requirements.in (line 1))
pulpcore<3.3,>=3.0 (from pulp-file==0.2.0->-r requirements.in (line 2))
```
4. However, if the pre-flight check was ignored, the install would have succeeded, because pulp-file would have been upgraded actually.
Users can work around this currently by specifying "version" for the plugin.
We can fix this by running a pre-flight command like:
`pip-compile -P pulp-file`
or if multiple plugins are specified to be upgraded:
`pip-compile -P pulp-file -P pulp-container`
This is in addition to the requirements.in existing like it currently does.
Another implementation (which I need to check if it will work, if pip-tools supports it) is per-requirement overrides for upgrading:
https://pip.pypa.io/en/stable/reference/pip_install/#per-requirement-overrides
I confirmed that this will fix this with a venv, starting with these packages installed:
pip install pulp-container==1.2.0 pulp-file==0.2.0
pip install pulp-container==1.2.0 pulp-file==0.2.0 pulpcore==3.2.1
.