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Re: standalone library/tool to query commit-graph?

On Thu, May 23, 2019 at 11:54:22PM +0200, Ævar Arnfjörð Bjarmason wrote:
> On Thu, May 23 2019, Jakub Narebski wrote:
> > Derrick Stolee <stolee@xxxxxxxxx> writes:
> >> On 5/22/2019 2:49 PM, Karl Ostmo wrote:
> >
> >>> After producing the file ".git/objects/info/commit-graph" with the
> >>> command "git commit-graph write", is there a way to answer queries
> >>> like "git merge-base --is-ancestor" without having a .git directory?
> >>> E.g. is there a library that will operate on the "commit-graph" file
> >>> all by itself?
> >>
> >> You could certainly build such a tool, assuming your merge-base parameters are
> >> full-length commit ids. If you try to start at ref names, you'll need the .git
> >> directory.
> >>
> >> I would not expect such a tool to ever exist in the Git codebase. Instead, you
> >> would need a new project, say "graph-analyzer --graph=<path> --is-ancestor <id1> <id2>"
> >
> > It would be nice if such tool could convert commit-graph into other
> > commonly used augmented graph storage formats, like GEXF (Graph Exchange
> > XML Format), GraphML, GML (Graph Modelling Language), Pajek format or
> > Graphviz .dot format.
> Wouldn't that make more sense as a hypothetical output format for "log
> --graph" rather than something you'd want to emit from the commit-graph?
> Presumably you'd want to export in such a format to see the shape of the
> repo, and since the commit graph doesn't include any commits outside of
> packs you'd miss any loose commits.

No, the commit-graph includes loose commits as well.