Re: [PATCH 3/3] commit-graph: error out on invalid commit oids in 'write --stdin-commits'

> On 8/5/2019 4:02 AM, SZEDER Gábor wrote:
> > While 'git commit-graph write --stdin-commits' expects commit object
> > ids as input, it accepts and silently skips over any invalid commit
> > object ids, and still exits with success:
> > 
> >   # nonsense
> >   $ echo not-a-commit-oid | git commit-graph write --stdin-commits
> >   $ echo $?
> >   0
> >   # sometimes I forgot that refs are not good...
> >   $ echo HEAD | git commit-graph write --stdin-commits
> >   $ echo $?
> >   0
> >   # valid tree OID, but not a commit OID
> >   $ git rev-parse HEAD^{tree} | git commit-graph write --stdin-commits
> >   $ echo $?
> >   0
> >   $ ls -l .git/objects/info/commit-graph
> >   ls: cannot access '.git/objects/info/commit-graph': No such file or directory
> > 
> > Check that all input records are indeed valid commit object ids and
> > return with error otherwise, the same way '--stdin-packs' handles
> > invalid input; see e103f7276f (commit-graph: return with errors during
> > write, 2019-06-12).
> 
> Consistency is good. We should definitely make these modes match.

> > Note that it should only return with error when encountering an
> > invalid commit object id coming from standard input.  However,
> > '--reachable' uses the same code path to process object ids pointed to
> > by all refs, and that includes tag object ids as well, which should
> > still be skipped over.  Therefore add a new flag to 'enum
> > commit_graph_write_flags' and a corresponding field to 'struct
> > write_commit_graph_context', so we can differentiate between those two
> > cases.
> 
> Thank you for the care here.