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bundle doc: elaborate on object prerequisites

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Split out the discussion bout "object prerequisites" into its own
section, and add some more examples of the common cases.

See 2e0afafebd (Add git-bundle: move objects and references by
archive, 2007-02-22) for the introduction of the documentation being
changed here.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Ævar Arnfjörð Bjarmason 2021-07-31 10:23:05 +02:00 committed by Junio C Hamano
parent 5c8273d57c
commit 9ab80dd6ae
1 changed files with 34 additions and 3 deletions
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37
Documentation/git-bundle.txt
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@ -44,6 +44,7 @@ header indicating what references are contained within the bundle.
Like the the packed archive format itself bundles can either be
self-contained, or be created using exclusions.
See the "OBJECT PREREQUISITES" section below.
Bundles created using revision exclusions are "thin packs" created
using the `--thin` option to linkgit:git-pack-objects[1], and
@ -152,19 +153,49 @@ contained in the union of the given bases. Each basis can be
specified explicitly (e.g. `^master~10`), or implicitly (e.g.
`master~10..master`, `--since=10.days.ago master`).
It is very important that the basis used be held by the destination.
OBJECT PREREQUISITES
--------------------
When creating bundles it is possible to create a self-contained bundle
that can be unbundled in a repository with no common history, as well
as providing negative revisions to exclude objects needed in the
earlier parts of the history.
Feeding a revision such as `new` to `git bundle create` will create a
bundle file that contains all the objects reachable from the revision
`new`. That bundle can be unbundled in any repository to obtain a full
history that leads to the revision `new`:
----------------
$ git bundle create full.bundle new
----------------
A revision range such as `old..new` will produce a bundle file that
will require the revision `old` (and any objects reachable from it)
to exist for the bundle to be "unbundle"-able:
----------------
$ git bundle create full.bundle old..new
----------------
A self-contained bundle without any prerequisites can be extracted
into anywhere, even into an empty repository, or be cloned from
(i.e., `new`, but not `old..new`).
It is okay to err on the side of caution, causing the bundle file
to contain objects already in the destination, as these are ignored
when unpacking at the destination.
`git clone` can use any bundle created without negative refspecs
(e.g., `new`, but not `old..new`).
If you want to match `git clone --mirror`, which would include your
refs such as `refs/remotes/*`, use `--all`.
If you want to provide the same set of refs that a clone directly
from the source repository would get, use `--branches --tags` for
the `<git-rev-list-args>`.
The 'git bundle verify' command can be used to check whether your
recipient repository has the required prerequisite commits for a
bundle.
EXAMPLES
--------