[SVN-4883] multi-wc-format

• Type: Improvement
• Status: In Progress
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.14.0
• Fix Version/s: 1.15-proposed
• Assignee: Julian Foad
• Reporter: Julian Foad
• Created: 24/Feb/22 12:17
• Updated: 07/Apr/22 11:04

Description

Allow a new version of the Subversion client to work on a WC that uses an older format, without upgrading that WC to the newest format the client knows.

Concrete example (currently hypothetical):

• if a v1.15 client were to support this feature, it could be made compatible with both the WC format used from Subversion 1.8 to 1.14 ("WC format 31") and a new format that would be introduced at the same time in 1.15 ("WC format 32").

This will allow the user to:

• use the new client and an old client against the same (old-format) WC
• use the new client's new features with a (new-format) WC

An implementation of this was recently merged into trunk. It was was developed on a branch named 'multi-wc-format'.

UI exposure of this feature includes:

• 'svn checkout' and 'svn upgrade' default to the oldest compatible WC format.
• 'svn checkout' and 'svn upgrade' accept an option such as '--compatible-version=1.15' to request a newer format.

Issue Links

• is blocked by: SVN-4887 multi-wc-format: clarify/unify option names for compatible-version
• is blocked by: SVN-4884 multi-wc-format: user visibility of WC version (info --show-item)
• relates to: SVN-4885 multi-wc-format: WC upgraded and not-upgraded notifications
• relates to: SVN-4886 multi-wc-format: config for default WC version for checkout & upgrade
• relates to: SVN-4890 forbid upgrading an external WC to mismatch its parent WC format