Re: [PATCH] gitmodules: recurse by default

["Daniel P. Berrangé" <berrange@redhat.com>]

On Thu, Oct 06, 2022 at 08:24:01PM -0400, Michael S. Tsirkin wrote:
> On Thu, Oct 06, 2022 at 07:54:52PM +0100, Daniel P. Berrangé wrote:
> > On Thu, Oct 06, 2022 at 07:39:07AM -0400, Michael S. Tsirkin wrote:
> > > The most commmon complaint about submodules is that
> > > they don't follow when one switches branches in the
> > > main repo. Enable recursing into submodules by default
> > > to address that.
> > > 
> > > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > > ---
> > >  .gitmodules | 23 +++++++++++++++++++++++
> > >  1 file changed, 23 insertions(+)
> > 
> > What am I missing, as I tried something equiv to this change
> > with one submodule and it didn't appear to have any effect.
> > I started from a clean slate:
> > 
> > $ git submodule  deinit --all --force
> > 
> > The .gitmodules config has 'recurse = true' for the ui/keycodemapdb
> > module:
> > 
> > $ grep keycodemap --after 1 .gitmodules 
> > [submodule "ui/keycodemapdb"]
> > 	path = ui/keycodemapdb
> > 	url = https://gitlab.com/qemu-project/keycodemapdb.git
> > 	recurse = true
> > 
> > I have a change on master setting the submodule commit:
> > 
> > $ git show master | grep +Sub
> > +Subproject commit 7381b9bfadd31c4c9e9a10b5bb5032f9189d4352
> > 
> > and check it out:
> > 
> > $ git submodule update --init ui/keycodemapdb
> > Submodule 'ui/keycodemapdb' (https://gitlab.com/qemu-project/keycodemapdb.git) registered for path 'ui/keycodemapdb'
> > Submodule path 'ui/keycodemapdb': checked out '7381b9bfadd31c4c9e9a10b5bb5032f9189d4352'
> > 
> > 
> > In another branch I have a different commit:
> > 
> > $ git show sub-foo  | grep +Sub
> > +Subproject commit 57ba70da5312170883a3d622cd2aa3fd0e2ec7ae
> > 
> > 
> > Now I switch branches and nothing happens, the submodule
> > is marked as dirty:
> > 
> > $ git checkout sub-foo
> > M	ui/keycodemapdb
> > Switched to branch 'sub-foo'
> > 
> > $ (cd ui/keycodemapdb && git show | head -1)
> > commit 7381b9bfadd31c4c9e9a10b5bb5032f9189d4352
> > 
> > 
> > >From your description (and indeed that of the man page) it
> > sounded like ui/keycodemapdb should have got updated to
> > commit 57ba70da5312170883a3d622cd2aa3fd0e2ec7ae when I did
> > 'git checkout', but that didn't happen
> 
> I think .gitmodules got overwritten when you checked out the branch.
> Possible?

No, it the same in both branches, since they share a common
ancestor commit which added the recurse tag

$ git checkout master
Switched to branch 'master'
$ git grep keycodemapdb --after 1 .gitmodules 
[submodule "ui/keycodemapdb"]
	path = ui/keycodemapdb
	url = https://gitlab.com/qemu-project/keycodemapdb.git
	recurse = true
$ git checkout sub-foo 
M	ui/keycodemapdb
Switched to branch 'sub-foo'
$ grep keycodemapdb --after 1 .gitmodules 
[submodule "ui/keycodemapdb"]
	path = ui/keycodemapdb
	url = https://gitlab.com/qemu-project/keycodemapdb.git
	recurse = true


With regards,
Daniel
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