Re: [PATCH] filter-branch: rewrite only refs which were not excluded bythe options

[Johannes Schindelin <Johannes.Schindelin@gmx.de>]

Hi,

On Tue, 24 Jul 2007, Johannes Sixt wrote:

> Johannes Schindelin wrote:
> > So really exclude excluded refs from being rewritten.  This also allows
> > you to safely call
> > 
> >         git filter-branch <some-filter> --all <rev-list options>
> > 
> > to rewrite _all_ branches and tags.
> 
> BTW, '--all' in the argument list of filter-branch works only if it is
> preceded by '--':
> 
> 	git filter-branch <some-filter> -- --all <rev-list options>

Hmm.  Maybe we should reconsider the logic.  I.e. instead of

        *)
                usage

        *)
                break

> > @@ -181,6 +181,7 @@ export GIT_DIR GIT_WORK_TREE=.
> > 
> >  # These refs should be updated if their heads were rewritten
> > 
> > +negatives="$(git rev-parse --revs-only "$@" | grep "^\^")"
> >  git rev-parse --revs-only --symbolic "$@" |
> >  while read ref
> >  do
> > @@ -196,7 +197,13 @@ do
> >                         grep "refs/\(tags\|heads\)/$ref$")"
> >         esac
> > 
> > -       git check-ref-format "$ref" && echo "$ref"
> > +       # make sure we have a valid ref
> > +       git check-ref-format "$ref" || continue
> > +
> > +       # if the ref has been excluded by the other options, skip it
> > +       test -z "$(git rev-list -1 "$ref" $negatives)" && continue
> 
> Does this catch my use-case with --since? I think not, because:
> 
> $ git rev-parse --revs-only --since=2007.01.01 master topic
> --max-age=1167606000
> 257061f3323dc0162f731d934f0870e919211fdf
> 3405729b94a654df8afbb9a1e13a4cf49a1c351c
> 
> There are no negatives. Does it help to filter the non-positives?
> 
> negatives=$(git rev-parse --revs-only "$@" | egrep -v '^[0-9a-f]{40}$')
> 
> (Except the the '{40}' part is not portable. Hmpf.)

To keep the "--since=..." we have to lose the "--revs-only"...
Darn.  I thought that "--since=" was expanded by rev-parse.  FWIW this 
might work:

negatives="$(git rev-parse "$@" | while read line
	do
		case "$line" in
		$_x40) ;;
		*) echo "$line";;
		esac
	done)"

Can you please test?  I am off for lunch.

Ciao,
Dscho