add revert command to revert a package to a rev

[lethliel]

This adds a revert command to restore a specific revision
of a package.

Basically this is just a osc copypac -r <rev> <proj> <pac> <proj>

implements #808

[marcus-h]

On 2020-07-07 01:23:56 -0700, Marco Strigl wrote: This adds a revert command to restore a specific revision of a package.

Hmm I'm not sure if the command does the "expected" thing [1] (from an average user's POV). Let's try to clarify the "expected" semantics first (note: maybe it already does the "expected" thing:) ). If the command is executed in a package wc, should we also reset the local wc state (see [2])? [1] #808 (comment) [2] #808 (comment)

[lethliel]

@mcepl Perhaps you can clarify if this is the expected behavior.
At least it is what I understood from your script.

[mcepl]

On 2020-07-07 01:23:56 -0700, Marco Strigl wrote:
If the command is executed in a package wc, should we also reset the local wc state (see [2])?

I would be completely OK if the command complained that the working directory is in “dirty” state (i.e., there are non-commited changes) and refused to continue. I believe some other subcommands (sr?) do exactly that.

[dmach]

This pull request has been in a draft state for quite some time.
Could you either finish it, close it or add a comment that you're still planning to work on it?