AW: Restoring detached HEADs after Git operations

From: Patrick Lehmann <patrick.lehmann@plc2.de>
Date: Jun 19, 2017, 18:09 UTC
Message-ID: <0092CDD27C5F9D418B0F3E9B5D05BE0801028B70@SBS2011.opfingen.plc2.de>
In-Reply-To: <CAGZ79kbMOdkKiVsvxk4UeKKPicyi958LpomeY=ypXT0_=5d8BQ@mail.gmail.com>

Hello Stefan,

the use case is as follows:

The projects consists of circa 18 IP cores. Each IP core is represented by a Git repository. Think of an IP core as of a lonestanding DLL or SO file project. Each IP core references 2 submodules, which bring the verification environments for testing the IP core standalone.

These 18 IP cores are grouped to bigger IP cores, referencing the low-level IP cores and each again the 2 verification submodules. Finally, the main project references the bigger IP cores and again the 2 verification cores.

TOPLEVEL
  o- IP1
       o- UVVM
       o- VUnit
  o- IP2
       o- UVVM
       o- VUnit
  o- IP3
       o- UVVM
       o- VUnit
  o- IP4
       o- UVVM
       o- VUnit
       o- IP5
           o- UVVM
           o- VUnit
       o- IP6
           o- UVVM
           o- VUnit
       o- IP7
           o- UVVM
           o- VUnit
  o- IP8
       o- UVVM
       o- VUnit
       o- IP9
           o- UVVM
           o- VUnit
       o- IP10
           o- UVVM
           o- VUnit
  o- IP11
       o- UVVM
       o- VUnit
       o- IP9
           o- UVVM
           o- VUnit
       o- IP12
           o- UVVM
           o- VUnit
   o- UVVM
   o- VUnit

That's the simplified structure. I can't write more, because it's a closed source project. You can find other usecases e.g. in my other open source projects. E.g. The PoC-Library or The PicoBlaze-Library and the corresponding PoC-Examples repository.

Example: PoC
Pile of Cores includes 4 Git submodules and is itself an IP core library.
So PoC-Examples again references PoC. This looks like this tree:

PoC-Examples
  |- lib/
       o- PoC
            |- lib
                o- Cocotb
                o- OSVVM
                o- VUnit
                     o- .... OSVVM
                o- UVVM

The library VUnit itself already includes OSVVM as a library.

---------------------- Forcast: I'll write a new question / idea about multiple equal submodules and the memory footprint soon... Here is my original question posted on StackOverflow: https://stackoverflow.com/questions/44585425/how-to-reduce-the-memory-footprint-for-multiple-submodules-of-the-same-source ----------------------

Do you need more use cases?

Kind regards
    Patrick
________________________________________
Von: git-owner@vger.kernel.org [git-owner@vger.kernel.org]&quot; im Auftrag von &quot;Stefan Beller [sbeller@google.com]
Gesendet: Montag, 19. Juni 2017 19:47
Bis: Patrick Lehmann
Cc: Lars Schneider; Git Mailinglist
Betreff: Re: Restoring detached HEADs after Git operations

On Mon, Jun 19, 2017 at 10:34 AM, Patrick Lehmann <Patrick.Lehmann@plc2.de> wrote:

> Hello,
>
> I'm just an advanced Git user, not a Git developer. So I might find some time to improve the suggested script, which I provided with the hints given on the mailing list, but I have no time to do a complete feature release in your patch based Git flow.

ok, thanks for letting us know. I may re-prioritize the "reattach HEAD" patches that I referenced earlier. I would have hoped that additionally to the shell lines you'd have given a good use case/summary.

Show 8 quoted lines

> I have no experience with other shells then Bash. So if you rely on a Bash with less features, please port the syntax to such a shell system. (I personally do not support legacy programs or out-date programs).
>
> ------
> We are talking about circa 50 submodules in total with a maximum depth of 4. The platforms are:
> - Mint OS with Git in Bash
> - Windows 7 with Git-Bash
> - Windows 10 with Git-Bash
> - Windows 10 with Posh-Git

Thanks, Stefan