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# Example: Creating an ISO with Rock Ridge extensions
This example will show how to create an ISO with the [Rock Ridge](standards.md#rock-ridge) extensions. Here's the complete code for the example:
```
try:
from cStringIO import StringIO as BytesIO
except ImportError:
from io import BytesIO
import pycdlib
iso = pycdlib.PyCdlib()
iso.new(rock_ridge='1.09')
foostr = b'foo\n'
iso.add_fp(BytesIO(foostr), len(foostr), '/FOO.;1', rr_name='foo')
iso.add_directory('/DIR1', rr_name='dir1')
iso.write('new.iso')
iso.close()
```
Let's take a closer look at the code.
```
try:
from cStringIO import StringIO as BytesIO
except ImportError:
from io import BytesIO
import pycdlib
```
As in earlier examples, import the relevant libraries, including pycdlib itself.
```
iso = pycdlib.PyCdlib()
iso.new(rock_ridge='1.09')
```
Create a new PyCdlib object, and then create a new ISO with that object. In order to make it have Rock Ridge extensions, we pass the argument `rock_ridge="1.09"` to the [new](pycdlib-api.html#PyCdlib-new) method. PyCdlib supports Rock Ridge versions 1.09, 1.10, and 1.12, though 1.09 is more common.
```
foostr = b'foo\n'
iso.add_fp(BytesIO(foostr), len(foostr), '/FOO.;1', rr_name='foo')
```
As in earlier examples, create a new file on the ISO from a string. Because this is a Rock Ridge ISO, we have to also supply the `rr_name` argument to the [add_fp](pycdlib-api.html#PyCdlib-add_fp) method. Forgetting the `rr_name` argument on a Rock Ridge ISO is an error and PyCdlib will throw an exception. Note that it is called `rr_name`, and that the argument given is truly a name, not an absolute path. This is because Rock Ridge is an extension to the original ISO9660, and this alternate name will be stored alongside the original ISO data.
```
iso.add_directory('/DIR1', rr_name='dir1')
```
Create a new directory on the ISO. Again we must pass the `rr_name` argument to [add_directory](pycdlib-api.html#PyCdlib-add_directory), for all of the same reasons and with the same restrictions as we saw above for [add_fp](pycdlib-api.html#PyCdlib-add_fp).
```
iso.write('new.iso')
iso.close()
```
Write the new ISO out to a file, then close out the ISO.
---
<div style="width: 100%; display: table;">
<div style="display: table-row;">
<div style="width: 33%; display: table-cell; text-align: left;">
<a href="example-creating-bootable-iso.html"><-- Example: Creating a bootable ISO (El Torito)</a>
</div>
<div style="width: 33%; display: table-cell; text-align: center;">
<a href="https://clalancette.github.io/pycdlib/">Top</a>
</div>
<div style="width: 33%; display: table-cell; text-align: right;">
<a href="example-creating-joliet-iso.html">Example: Creating an ISO with Joliet --></a>
</div>
</div>
|
