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Description:

sower 1.1.1

Sower
Sower “plants” directories, files and symlinks on your filesystem based on a contract you tell it.

How to Install
$ pip install sower

Why Do You Need Sower?

The Problem
Have you ever been in a situation where you needed to create a large set of
files, that may span multiple subdirectories? You might need to do this for
testing, especially if your application that you’re testing is supposed to
be tested for how it manages a set of files based on their directory
structure.

The Solution - Part 1
Sower is the solution for this problem! You simply define a contract in
YAML or JSON like the following:

YAML (sower-contract.yml)
JSON (sower-contract.json)

---
sower:
plan:
bin:
start.sh:
type: file
content: "echo 'Starting foobar'"
stop.sh:
type: file
content: "echo 'Stopping foobar'"
data:
test-data.tar.gz:
type: file
content: "!random!"
size: 1Mb
src:
foobar:
__init__.py:
type: file
content: "# just a comment"
main.py:
type: file
content: >
import os\n
print('Foo Bar: %s' % os.path.abspath('.'))\n\n
link_main.py:
type: symlink
target: ../foobar/main.py

{
"sower": {
"plan": {
"bin": {
"start.sh": {
"type": "file",
"content": "echo'Startingfoobar'"
},
"stop.sh": {
"type": "file",
"content": "echo'Stoppingfoobar'"
}
},
"data": {
"test-data.tar.gz": {
"type": "file",
"content": "!random!",
"size": "1Mb"
}
},
"src": {
"foobar": {
"__init__.py": {
"type": "file",
"content": "#justacomment"
},
"main.py": {
"type": "file",
"content": "importos\nprint('FooBar: %s'%os.path.abspath('.')\n\n
},
"link_main.py": {
"type": "symlink",
"target": "../foobar/main.py"
}
}
}
}
}
}

Save the Contract to disk (choose either YAML or JSON listing from above). Now
we simply tell Sower where to create these files, and the path to this contract.
If we want to create files based on this contract on /home/davydany/foobar, we would do
the following:
If you chose the YAML, run the following:
.. code:: bash

$ sower sow /home/davydany/foobar /tmp/sower-contract.yml

If you chose the JSON, run the following:
.. code:: bash

$ sower sow /home/davydany/foobar /tmp/sower-contract.json

This would create the following structure:
/home/davydany/foobar
├── bin
│   ├── start.sh
│   └── stop.sh
├── data
│   └── test-data.tar.gz
└── src
└── foobar
├── __init__.py
├── link_main.py -> /tmp/foobar/src/foobar/main.py
└── main.py

4 directories, 6 files

The Solution - Part 2
Now, suppose you need to do this in your integration tests that use python’s unittest. You
can still leverage this with the Sower API.
You would have something like this in your test’s setUp method.
import tempfile
import unittest
from sower.farm import perform_sow

class TestMyApp(unittest.TestCase):

def setUp(self):

self.root = tempfile.mkdtemp('_farmer_test')
self.contract = """

---
sower:
plan:
bin:
start.sh:
type: file
content: "echo 'Starting foobar'"
stop.sh:
type: file
content: "echo 'Stopping foobar'"
data:
test-data.tar.gz:
type: file
content: "!random!"
size: 1Mb
src:
foobar:
__init__.py:
type: file
content: "# just a comment"
main.py:
type: file
content: >
import os\n
print('Foo Bar: %s' % os.path.abspath('.'))\n\n
link_main.py:
type: symlink
target: ../foobar/main.py
"""
perform_sow(self.contract, self.root)