Hi John,
The best possibility I can come up with is dh-virtualenv
http://dh-virtualenv.readthedocs.io/en/1.0/usage.html
I am far from a python guru and it looks fiendishly complicated, but
appears to allow a virtual python environment during a package build.
Not sure however whether it requires python3.x or if it can be used for
the exact purpose you require.
regards
On 04/10/17 19:26, John Morris wrote:
It occurs to me there's another possibility for cross-building
Multi-Arch packages that might be somewhat simpler than the `gcc
--sysroot` system I've been working on with Mick, but maybe a python
guru would know better about the feasibility.
Under normal Multi-Arch cross-building circumstances, we would use
e.g. `mk-build-deps --host-arch armhf -i`, and all armhf-arch
dependency packages would be installed alongside the amd64 versions.
Then we'd build the package as usual, while specifying the host arch,
e.g. `dpkg-buildpackage -a armhf`.
However, because MK uses many python dependencies, and building
Multi-Arch python packages is non-trivial [1], the `mk-build-deps`
command uninstalls the amd64 build-arch `python2.7` and other packages
in order to install the armhf host-arch deps (python-simplejson,
libboost-python-dev, cython, python-tk, python-protobuf). Of course
this would break the build, since the amd64 build-arch python would be
missing.
I wonder if a build-arch python could somehow be installed outside the
packaging system, for example in /usr/local, and just for the package
build, we point to that python. Then the packaging system could be
fooled into cross-building armhf packages, and the only antics we'd
have to perform would be installing the alternative python version.
Does anyone think they know how to do that, install python outside of
the packaging system? Maybe that means build from source, or maybe it
means install the amd64-arch package first and move it out of the way,
or maybe use some other creative means. This would be a really
valuable thing to have going forward, since it would clear the path
for cross-building packages for many Debian releases to come without
the difficult antics of the currently proposed system.
[1]: https://wiki.debian.org/Python/MultiArch
John
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