New issue 216: Adding new option install_deps_command or install_option
https://bitbucket.org/hpk42/tox/issue/216/adding-new-option-install_deps_command-or
Nicolas Delaby:
Hi,
## here is my problem:
I'm trying to install a library I want to test with a custom argument to pip.
To achieve this I'm using in my configuration file
```ini
install_command = pip install {opts} {packages} --install-option="--foo=bar"
```
It works great, but because this install command is also used to install the
testing dependencies.
They start to fail because `--foo` is not recognized.
```
Running setup.py install for py
usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
or: -c --help [cmd1 cmd2 ...]
or: -c --help-commands
or: -c cmd --help
error: option --foo not recognized
```
## Suggested solution 1:
introduce a new option `install_deps_command`, that by default is using
`install_command` value, to specify which command should be used to install the
dependencies only.
## Suggested solution 2:
introduce a new option `install_option` to append
`--install-option="--foo=bar"` to the `pip install {opts} {packages}` command
string. that is used to install the project we test only (excluding
dependencies).
example:
```ini
install_option = --foo=bar
```
I'm willing to make the patch to solve this issue.
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