PurlDB: Provide a list of all known package versions

[DennisClark]

For the generic packages, we are processing in batches, we want to also return their versions. This is special since many of these are generic packages without structured version metadata.

[keshav-space]

Completed in:

• Add support for directory listed source archives in package.info fetchcode#107
• purl2sym: Add metadata support for packages hosted on GitHub fetchcode#112
• purl2sym: Add metadata support for linux, mtd-utils, barebox, e2fsprogs and erofs-utils fetchcode#113
• Add metadata support for openssl, udhcp fetchcode#114
• Use authenticated requests for GitHub REST API calls fetchcode#115

The simple way to test this is to follow the below steps:

1. Install fetchcode using pip install fetchcode
2. Call the fetchcode.package.info using versionless PURL. See example below.

Example to fetch all known version of pkg:generic/miniupnpc:

>>> from fetchcode.package import info
>>> packages = list(info("pkg:generic/miniupnpc"))
>>> print("\n".join([p.purl for p in packages]))
pkg:generic/miniupnpc@1.7
pkg:generic/miniupnpc@1.8
pkg:generic/miniupnpc@1.9
pkg:generic/miniupnpc@2.0
pkg:generic/miniupnpc@2.1
pkg:generic/miniupnpc@2.2.0
pkg:generic/miniupnpc@2.2.1
pkg:generic/miniupnpc@2.2.2
pkg:generic/miniupnpc@2.2.3
pkg:generic/miniupnpc@2.2.4
pkg:generic/miniupnpc@2.2.5
pkg:generic/miniupnpc@2.2.6
pkg:generic/miniupnpc@2.2.7