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rev-list: add commit object support in --missing option

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The `--missing` object option in rev-list currently works only with
missing blobs/trees. For missing commits the revision walker fails with
a fatal error.

Let's extend the functionality of `--missing` option to also support
commit objects. This is done by adding a `missing_objects` field to
`rev_info`. This field is an `oidset` to which we'll add the missing
commits as we encounter them. The revision walker will now continue the
traversal and call `show_commit()` even for missing commits. In rev-list
we can then check if the commit is a missing commit and call the
existing code for parsing `--missing` objects.

A scenario where this option would be used is to find the boundary
objects between different object directories. Consider a repository with
a main object directory (GIT_OBJECT_DIRECTORY) and one or more alternate
object directories (GIT_ALTERNATE_OBJECT_DIRECTORIES). In such a
repository, using the `--missing=print` option while disabling the
alternate object directory allows us to find the boundary objects
between the main and alternate object directory.

Helped-by: Patrick Steinhardt <ps@pks.im>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Karthik Nayak
2023-10-27 09:59:29 +02:00
committed by Junio C Hamano
parent b49529230d
commit 9830926c7d
5 changed files with 101 additions and 2 deletions
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4
revision.h
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@ -4,6 +4,7 @@
#include "commit.h"
#include "grep.h"
#include "notes.h"
#include "oidset.h"
#include "pretty.h"
#include "diff.h"
#include "commit-slab-decl.h"
@ -373,6 +374,9 @@ struct rev_info {
/* Location where temporary objects for remerge-diff are written. */
struct tmp_objdir *remerge_objdir;
/* Missing commits to be tracked without failing traversal. */
struct oidset missing_commits;
};
/**