If a single package is listed as a constraint; is a dependency of a
package being installed; *and* is already installed, we end up
processing it multiple times. This change adds a new "prepared" flag
which we set the first time the package is processed, to prevent
multiple handling.
Fixes bug #2888
This adds constraints files. Like requirements files constraints files
control what version of a package is installed, but unlike
requirements files this doesn't itself choose to install the package.
This allows things that aren't explicitly desired to be constrained if
and only if they are installed.
We only want to prompt people to upgrade their pip version if the
newer version is not a post release of the version they have and
it's not a pre-release version.
importing it prevent to debug other packages with `-W error` as the
deprecation warning will raise.
Though there is still imp imported from a few vendorized packages,
and for other purposes than cache_from_source.
and adjust the logic to match; the result is simpler.
2) Due to #1, we can remove some hairy "format_control" hacks
3) Due to #1, we have to relax the parsing and allow:
- multiple options per line
- any supported option on a line with a requirement (not just
--install-option/--global-option, although they are the only
options that are passed into a requirement)
Using --install-options, --build-options, --global-options changes
the way that setup.py behaves, and isn't honoured by the wheel code.
The new wheel autobuilding code made this very obvious - disable
the use of wheels when these options are supplied.
With wheel autobuilding in place a release blocker is some granular
way to opt-out of wheels for known-bad packages. This patch introduces
two new options: --no-binary and --only-binary to control what
archives we are willing to use on both a global and per-package basis.
This also closes#2084
Wheel cache lookups become more complex when we wish to allow binary
blacklisting. Rather than passing more parameters around, replace
cache_root with wheel_cache, and create a wheel cache in all the
relevant command entry points.
