View source for Retrieve files from the repository

==Retrieve files from the project's Github repository==
When accessing project files via scripts or programs, it must be taken into account that these may only be available in gzip-compressed format, as otherwise their size would exceed the limit set by Github. Therefore, if an access error occurs, a second attempt should be made, appending the file extension “.gz” to the file name and decompressing the file after downloading.

====Example local file access with a Python script====
<syntaxhighlight lang="python">
#!/usr/bin/env python3
import json
import gzip

def readOSSelot(name):
    osselotjson = ''
    try:
        osselotfile = open(name, 'r')
        jsonloader = json.load
        jsoncloser = osselotfile
    except:
        try:
            gzipfile = gzip.open(name + '.gz', 'rb')
            osselotfile = gzipfile.read()
            jsonloader = json.loads
            jsoncloser = gzipfile
        except:
            return ''
    try:
        osselotjson = jsonloader(osselotfile)
    except json.decoder.JSONDecodeError:
        pass
    jsoncloser.close()
    return osselotjson

name = 'package-analysis/analysed-packages/bash/version-5.1.16/bash-5.1.16.spdx.json'
bash = readOSSelot(name)
if bash != '':
    print(bash['packages'][0]['name'])

name = 'package-analysis/analysed-packages/linux/version-6.0/linux-6.0.spdx.json'
linux = readOSSelot(name)
if linux != '':
    print(linux['packages'][0]['name'])
</syntaxhighlight>
Run the script:
<syntaxhighlight lang="bash">
$ readOSSelot.py 
bash-5.1.16.tar.gz
linux-6.0.tar.xz
</syntaxhighlight>
In both cases, the correct file was opened and its contents returned, even though in the second case the name of a non-existent file was specified.
====Example Web server access with a Python script====
<syntaxhighlight lang="python">
#!/usr/bin/env python3
import json
from urllib import request
import gzip

def fetchOSSelot(url):
    try:
        osselot = request.urlopen(url)
        osselotdata = osselot.read()
    except:
        try:
            osselotgz = request.urlopen(url + '.gz')
            osselotgzdata = osselotgz.read()
            osselotdata = gzip.decompress(osselotgzdata)
        except:
            return ''
    try:
        osselotjson = json.loads(osselotdata)
        return osselotjson
    except json.decoder.JSONDecodeError:
        return ''

url = 'https://github.com/Open-Source-Compliance/package-analysis/raw/refs/heads/main/analysed-packages/bash/version-5.1.16/bash-5.1.16.spdx.json'
bash = fetchOSSelot(url)
if bash != '':
    print(bash['packages'][0]['name'])

url = 'https://github.com/Open-Source-Compliance/package-analysis/raw/refs/heads/main/analysed-packages/linux/version-6.0/linux-6.0.spdx.json'
linux = fetchOSSelot(url)
if linux != '':
    print(linux['packages'][0]['name'])
</syntaxhighlight>
Run the script:
<syntaxhighlight lang="bash">
$ fetschOSSelot.py 
bash-5.1.16.tar.gz
linux-6.0.tar.xz
</syntaxhighlight>
As above, but here when accessing the file via network, the correct file was downloaded and its contents returned, even though in the second case the name of a non-existent file was specified.
====Retrieving uncompressed files from the <span style="font-family: OSSelot-Bold; font-weight: 500; color: #1565af;">OSSelot</span> repository mirror with a Python script====
Finally, if decompressing is by any reason not an option, uncompressed files can be retrieved immediately from the repository mirror at the <span style="font-family: OSSelot-Bold; font-weight: 500; color: #1565af;">OSSelot</span> Web site
<syntaxhighlight lang="python">
#!/usr/bin/env python3
import json
from urllib import request
import gzip

def fetchOSSelot2(url):
    try:
        osselot = request.urlopen(url)
    except:
        try:
            osselot = request.urlopen(url.replace('github.com', 'osselot.org'))
        except:
            return ''
    osselotdata = osselot.read()
    try:
        osselotjson = json.loads(osselotdata)
        return osselotjson
    except json.decoder.JSONDecodeError:
        return ''

url = 'https://github.com/Open-Source-Compliance/package-analysis/raw/refs/heads/main/analysed-packages/bash/version-5.1.16/bash-5.1.16.spdx.json'
bash = fetchOSSelot2(url)
if bash != '':
    print(bash['packages'][0]['name'])

url = 'https://github.com/Open-Source-Compliance/package-analysis/raw/refs/heads/main/analysed-packages/linux/version-6.0/linux-6.0.spdx.json'
linux = fetchOSSelot2(url)
if linux != ''
    print(linux['packages'][0]['name'])
</syntaxhighlight>
Run the script:
<syntaxhighlight lang="bash">
$ fetschOSSelot2.py 
bash-5.1.16.tar.gz
linux-6.0.tar.xz
</syntaxhighlight>
Again as above, when accessing the file via network, the correct file was downloaded and its contents returned, even though in the second case the name of a file was specified that only exists in uncompressed form on the repository mirror at the <span style="font-family: OSSelot-Bold; font-weight: 500; color: #1565af;">OSSelot</span> Web site.