Add support for alternate keychains in expression.

[jaraco]

• Add test capturing need for an alternate keyring with an alternate keychain.
• Add support for getting another Keyring with an alternate keychain. Fixes #579.
• Update changelog.

[jaraco]

With this change, one can now easily select the relevant keychain thus:

keyring.get_keyring().with_keychain('~/Library/Keychains/alt.keychain-db').get_password(...)

And one can re-use that alternate keychain path with:

alt = keyring.get_keyring().with_keychain('...')
alt.set_password(...)
alt.get_password(...)

[matthewsht]

This is very welcome to us MacOS users.

-- Hunter Matthews Scientific System Engineer [C] NIH/National Human Genome Research Institute @.**@.> | (919) 491-2124

On Jun 4, 2022, at 9:23 PM, Jason R. Coombs @.**@.>> wrote:

With this change, one can now easily select the relevant keychain thus:

keyring.get_keyring().with_keychain('~/Library/Keychains/alt.keychain-db').get_password(...)

And one can re-use that alternate keychain path with:

alt = keyring.get_keyring().with_keychain('...') alt.set_password(...) alt.get_password(...)

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[a350h]

This also solved #571 in a much more elegant manner than i proposed.