wrappers for running commands that need some initial setup
Project description
A command line tool to create wrappers around executable files
Rationale
exec-wrappers is useful whenever you need a single executable file, but have to do some setup before executing it.
If you develop using some kind of environment isolation like conda, schroot, virtualenv you probably wanted to configure a GUI application like an IDE to use the executables available inside these environments.
But you normally have to create a script that do some setup/activation step and then run the command but creating such a script for each executable is tedious.
exec-wrappers helps automating that as it detects executable files and create a wrapper for each of them. It also already provides some wrappers for common tools.
Also, as the wrappers are intended to be used non-interactively, they are normally much simpler than the interactive counterpart.
For example, the conda wrappers are much faster than doing an activate and executing the command:
Regular activate:
$ echo 'source activate test 2> /dev/null; "$@"' > /tmp/activate-and-run && chmod a+x /tmp/activate-and-run
$ time /tmp/activate-and-run python --version
Python 2.7.11 :: Continuum Analytics, Inc.
real 0m0.354s
user 0m0.288s
sys 0m0.040s
Using python wrapper created by exec-wrappers:
$ time /tmp/conda_wrappers/python --version
Python 2.7.11 :: Continuum Analytics, Inc.
real 0m0.003s
user 0m0.000s
sys 0m0.000s
Having a low overhead is very important if you are executing the command non-interactively.
Features
automatically detect executables in a given directory
wrappers written in plain shell and batch scripts
low overhead (as low as possible)
built-in wrappers for common tools
Requirements
python is the only dependency to create wrappers. To properly use the generated wrappers you need the tool used by the wrapper (conda, schroot, etc.).
Installation
$ python setup.py install
How it works
Creating conda wrappers:
$ create-wrappers -t conda --bin-dir ~/miniconda/envs/test/bin --dest-dir /tmp/conda_wrappers --conda-env-dir ~/miniconda/envs/test
This will create in /tmp/conda_wrappers a wrapper for each executable found in ~/miniconda/envs/test/bin. So if you run the python wrapper:
$ /tmp/conda_wrappers/python -c "import sys; print(sys.executable)"
/home/username/miniconda/envs/test/bin/python
It will actually activate the conda environment and set necessary variables, and then execute the real python interpreter. So you can use the wrapper to configure you IDE, for example.
Also a run-in script will be created, which you can use to run any arbitrary command:
$ /tmp/conda_wrappers/run-in bash -c 'echo $CONDA_DEFAULT_ENV'
/home/username/miniconda/envs/test
Examples
conda:
$ create-wrappers -t conda -b ~/miniconda/envs/test/bin -d /tmp/conda_wrappers --conda-env-dir ~/miniconda/envs/test
virtualenv:
$ create-wrappers -t virtualenv -b ~/python3-env/bin -d /tmp/virtualenv_wrappers --virtual-env-dir ~/python3-env
schroot:
$ create-wrappers -t schroot -b ~/chroots/centos5/bin -d /tmp/schroot_wrappers --schroot-name centos5
$ create-wrappers -t schroot -b ~/chroots/centos5/bin -d /tmp/schroot_wrappers --schroot-name centos5 --schroot-options="-p -d /"
custom:
$ echo -e '#!/bin/sh\necho "$@"' > /tmp/custom-script && chmod a+x /tmp/custom-script
$ create-wrappers -t custom --custom-script=/tmp/custom-script -b /usr/bin -d /tmp/custom_wrappers
wrap only specified files:
$ create-wrappers -t schroot -f gcc:gdb -d /tmp/schroot_wrappers --schroot-name centos5
chain multiple wrappers:
$ create-wrappers -t conda -b ~/miniconda/envs/test/bin -d /tmp/conda_wrappers --conda-env-dir ~/miniconda/envs/test
$ create-wrappers -t schroot -b /tmp/conda_wrappers -d /tmp/schroot_wrappers --schroot-name centos5
License
Distributed under the terms of the MIT license, exec-wrappers is free and open source software
Issues
If you encounter any problems, please file an issue along with a detailed description.
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