values of `<msg-id>` and `<severity>`.

--progress-title::
	For internal use only.
+
Set the title of the progress bar. The title is "Receiving objects" by
default and "Indexing objects" when `--stdin` is specified.

--check-self-contained-and-connected::
	Die if the pack contains broken links. For internal use only.

--fsck-objects[=<msg-id>=<severity>...]::
	Die if the pack contains broken objects, but unlike `--strict`, don't
	choke on broken links. If the pack contains a tree pointing to a
	.gitmodules blob that does not exist, prints the hash of that blob
	(for the caller to check) after the hash that goes into the name of the
	pack/idx file (see "Notes").
+
An optional comma-separated list of `<msg-id>=<severity>` can be passed to
change the severity of some possible issues, e.g.,
`--fsck-objects="missingEmail=ignore,badTagName=ignore"`. See the entry for the
`fsck.<msg-id>` configuration options in linkgit:git-fsck[1] for more
information on the possible values of `<msg-id>` and `<severity>`.

--threads=<n>::
	Specifies the number of threads to spawn when resolving
	deltas. This requires that index-pack be compiled with
	pthreads otherwise this option is ignored with a warning.
	This is meant to reduce packing time on multiprocessor
	machines. The required amount of memory for the delta search
	window is however multiplied by the number of threads.
	Specifying 0 will cause Git to auto-detect the number of CPU's
	and use maximum 3 threads.

--max-input-size=<size>::
	Die, if the pack is larger than <size>.

--object-format=<hash-algorithm>::
	Specify the given object format (hash algorithm) for the pack.  The valid
	values are 'sha1' and (if enabled) 'sha256'.  The default is the algorithm for
	the current repository (set by `extensions.objectFormat`), or 'sha1' if no
	value is set or outside a repository.
+
This option cannot be used with --stdin.
+
include::object-format-disclaimer.adoc[]

--promisor[=<message>]::
	Before committing the pack-index, create a .promisor file for this
	pack. Particularly helpful when writing a promisor pack with --fix-thin
	since the name of the pack is not final until the pack has been fully
	written. If a `<message>` is provided, then that content will be
	written to the .promisor file for future reference. See
	link:technical/partial-clone.html[partial clone] for more information.
+
Also, if there are objects in the given pack that references non-promisor
objects (in the repo), repacks those non-promisor objects into a promisor
pack. This avoids a situation in which a repo has non-promisor objects that are
accessible through promisor objects.
+
Requires <pack-file> to not be specified.

NOTES
-----

Once the index has been created, the hash that goes into the name of
the pack/idx file is printed to stdout. If --stdin was
also used then this is prefixed by either "pack\t", or "keep\t" if a
new .keep file was successfully created. This is useful to remove a
.keep file used as a lock to prevent the race with 'git repack'
mentioned above.

GIT
---
Part of the linkgit:git[1] suite