Hi Pete,

I should have updated on this earlier, but I wished to refine my work
on this feature before submitting.  With 2.0 looming I'll submit
what's there so far.

There is a patch viewable at this link:

For the use case this works perfectly - if I define branch mappings
with git config, followed by setting 'git-p4.skipBranchScan' to true,
git-p4 will skip scanning of all remote branches and limit to what's
defined in the map.  An example config:

        skipBranchScan = true
        branchList = release_1.0.0:release_1.1.0
        branchList = release_1.1.0:release_1.2.0

If there is any more information I need to provide let me know. I have
been using this patch for over two months, testing both use cases with
and without git-p4.skipBranchScan and I have noticed no issues.  Logic
of git-p4 is not changed from default behaviour, unless the user
explicitly sets the boolean flag to skip scanning.


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On 23 February 2014 15:12, Pete Wyckoff <p...@padd.com> wrote:
> dpr...@gmail.com wrote on Tue, 18 Feb 2014 12:42 +0000:
>> I work at a company that has recently moved all CVS, SVN, and git
>> repositories to Perforce.  Depots have not been setup correctly in
>> every case, and there is one depot that contains literally hundreds of
>> projects under commercial development (and hundreds of branches as a
>> result)
> My condolences.
>> My project may be in //stupid_depot/commercial/teamporter/rok.  This
>> is the path I clone with git-p4.  The only branches in this depot that
>> contain files at this path are titled as
>> 'rok_porter_branch/release_1.x' or similar.
>> When using '--detect-branches' git-p4 checks each key of branches to
>> see if any of them have files in the path I've cloned.  Whilst this is
>> good in practice there is unfortunately 6,809 branches, git-p4
>> processes about 2 a second and just under an hour to perform any
>> git-p4 rebase, submit, or similar operation.
> This is in getBranchMapping() presumably.  Where it loops
> over each branch doing "p4 branch -o".  Yuk.
> You could always avoid the --detect-branches if you don't really
> need it, instead doing, say, multiple "git p4 sync" for the
> different areas of the repo that interest you, each with its own
> destination branch in git ("p4/depot-part1", "p4/depot-part3",
> ...).  Or --use-client-spec to cobble together an exact mapping
> of where p4 files should land in git, all in a single git branch
> then.
>> I propose the addition of a branch list filtering option
>> (--filter-branches) that takes either a regular expression or list of
>> branches it should check.  This may be useful in sane situations where
>> you don't want to scan every branch in a Perforce repository, or
>> blacklist branches that have undesirable content (for example, one of
>> the branches is called 'svn-backup'.  It contains a single, multi-GB
>> tarball.)
> There is the existing git-p4.branchList option that explicitly
> adds (or overrides) branch information, beyond the ones auto-discovered.
> You might be able to use that option, but change its behavior
> to avoid the scan.  So that if that option is set in the config,
> p4 is not asked anything about its branches.  Not sure if this
> would break anyone's setup though.
> Another approach would be to add a config option
> git-p4.branchScan that defaults to True.  You could turn it off
> and use branchList.
>> It would be ideal to have this information (after initial clone or
>> sync) stored somewhere in the git config where is appropriate so that
>> future submit/rebase operations adhere to this list.
>> Has something like this been worked on, or has been considered in the
>> past?  If not I will consider implementing this after reading up on
>> the Git code guidelines.
>> Thanks for keeping the Git workflow accessible in painful areas.
> It would be great if you could get something like this to work.
> Start in getBranchMapping() and don't forget to write up your
> work in Documentation/git-p4.txt.  Also, this is sort of a messy
> area of the code, unfortunately.  t/t9801 tries to make sure some
> of it keeps working.
>                 -- Pete
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