how to import tags?

Hollis Blanchard hollis_blanchard at
Thu May 24 16:35:31 EDT 2018

On 05/24/2018 11:38 AM, Augie Fackler wrote:
>> On May 24, 2018, at 2:20 PM, Hollis Blanchard 
>> <hollis_blanchard at <mailto:hollis_blanchard at>> wrote:
>> On 05/23/2018 03:15 PM, Hollis Blanchard wrote:
>>> 2. Commit tags as children of the correct head.
>>> I don't see a 'tag' cmdline option for this, though: the parent 
>>> commit is the parent of the working directory, without an ability to 
>>> override. That means I would need to keep working directories for 
>>> all these mirrors, and since there are GBs of working directories 
>>> and millions of files, that would be significant overhead.
>> Looks like I can use 'hg debugsetparents' for exactly this purpose:
>>     hg debugsetparents REV1 [REV2]
>>     manually set the parents of the current working directory
>>         This is useful for writing repository conversion tools, but
>>     should be used
>>         with care. For example, neither the working directory nor the
>>     dirstate is
>>         updated, so file status may be incorrect after running this
>>     command.
>> I hope that debug command sticks around…
> I’d be very surprised if it went away. I’d probably do what you’re 
> doing given the same constraints.
I've run into two complications:

1. Bookmarks. If I apply a tag to a bookmarked changeset, I want the 
bookmark to advance (don't I?). However, debugsetparents doesn't 
activate the bookmark, so it doesn't advance. To work around that, I 
could script all the bookmark manipulation by hand, but that's awkward 
and becoming many python invocations...

2. Importing one label become a series of stateful commands: 
debugsetparents; tag; adjust bookmarks; maybe debugsetparents back. If 
something interrupts that sequence (e.g. concurrent imports, or even 
something external like 'kill'), then badness would result.

It seems like a 'tag --parent' option would solve all of these problems. 
Is that reasonable, if someone submitted a decent patch for it?

Hollis Blanchard
Mentor Graphics Emulation Division

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