On Thu, May 22, 2014 at 11:33:04PM +0200, Christian Couder wrote:

> The usage string for this option is:
> git replace [-f] --graft <commit> [<parent>...]
> First we create a new commit that is the same as <commit>
> except that its parents are [<parents>...]
> Then we create a replace ref that replace <commit> with
> the commit we just created.
> With this new option, it should be straightforward to
> convert grafts to replace refs, with something like:
> cat .git/info/grafts | while read line
> do git replace --graft $line; done

I think this script at the end should end up in the documentation or a
contrib script (probably the former, as it is short enough that somebody
might just cut-and-paste).

The graft file ignores comments and blank lines, so maybe "grep '^[^#]'"
would be in order.

And maybe it's just me, but I think spacing it like:

  grep '^[^#]' .git/info/grafts |
  while read line; do
        git replace --graft $line

is more readable (I think some would even argue for putting the "do" on
a separate line).

> +     /* make sure the commit is not corrupt */
> +     if (parse_commit_buffer(commit, buf.buf, buf.len))
> +             die(_("Could not parse commit: '%s'"), old_ref);

I guess the checks here are sufficient to make...

> +     /* find existing parents */
> +     parent_start = buf.buf;
> +     parent_start += 46; /* "tree " + "hex sha1" + "\n" */
> +     parent_end = parent_start;
> +
> +     while (starts_with(parent_end, "parent "))
> +             parent_end += 48; /* "parent " + "hex sha1" + "\n" */

...this number-based parsing safe, though it would miss removing a stray
parent line elsewhere in the commit. It still feels rather magical to
me, as we are depending on unspoken format guarantees defined inside
parse_commit_buffer. I'd prefer something like the line-based parser I
showed in the other thread, but I suppose it may just be a matter of

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