git-replace - Online in the Cloud

PROGRAM:

NAME

git-replace - Create, list, delete refs to replace objects

SYNOPSIS

git replace [-f] <object> <replacement>
git replace [-f] --edit <object>
git replace [-f] --graft <commit> [<parent>...]
git replace -d <object>...
git replace [--format=<format>] [-l [<pattern>]]

DESCRIPTION

Adds a replace reference in refs/replace/ namespace.

The name of the replace reference is the SHA-1 of the object that is replaced. The content
of the replace reference is the SHA-1 of the replacement object.

The replaced object and the replacement object must be of the same type. This restriction
can be bypassed using -f.

Unless -f is given, the replace reference must not yet exist.

There is no other restriction on the replaced and replacement objects. Merge commits can
be replaced by non-merge commits and vice versa.

Replacement references will be used by default by all Git commands except those doing
reachability traversal (prune, pack transfer and fsck).

It is possible to disable use of replacement references for any command using the
--no-replace-objects option just after git.

For example if commit foo has been replaced by commit bar:

$ git --no-replace-objects cat-file commit foo

shows information about commit foo, while:

$ git cat-file commit foo

shows information about commit bar.

The GIT_NO_REPLACE_OBJECTS environment variable can be set to achieve the same effect as
the --no-replace-objects option.

OPTIONS

-f, --force
If an existing replace ref for the same object exists, it will be overwritten (instead
of failing).

-d, --delete
Delete existing replace refs for the given objects.

--edit <object>
Edit an object’s content interactively. The existing content for <object> is
pretty-printed into a temporary file, an editor is launched on the file, and the
result is parsed to create a new object of the same type as <object>. A replacement
ref is then created to replace <object> with the newly created object. See git-var(1)
for details about how the editor will be chosen.

--raw
When editing, provide the raw object contents rather than pretty-printed ones.
Currently this only affects trees, which will be shown in their binary form. This is
harder to work with, but can help when repairing a tree that is so corrupted it cannot
be pretty-printed. Note that you may need to configure your editor to cleanly read and
write binary data.

--graft <commit> [<parent>...]
Create a graft commit. A new commit is created with the same content as <commit>
except that its parents will be [<parent>...] instead of <commit>'s parents. A
replacement ref is then created to replace <commit> with the newly created commit. See
contrib/convert-grafts-to-replace-refs.sh for an example script based on this option
that can convert grafts to replace refs.

-l <pattern>, --list <pattern>
List replace refs for objects that match the given pattern (or all if no pattern is
given). Typing "git replace" without arguments, also lists all replace refs.

--format=<format>
When listing, use the specified <format>, which can be one of short, medium and long.
When omitted, the format defaults to short.

FORMATS

The following format are available:

· short: <replaced sha1>

· medium: <replaced sha1> → <replacement sha1>

· long: <replaced sha1> (<replaced type>) → <replacement sha1> (<replacement type>)

CREATING REPLACEMENT OBJECTS

git-filter-branch(1), git-hash-object(1) and git-rebase(1), among other git commands, can
be used to create replacement objects from existing objects. The --edit option can also be
used with git replace to create a replacement object by editing an existing object.

If you want to replace many blobs, trees or commits that are part of a string of commits,
you may just want to create a replacement string of commits and then only replace the
commit at the tip of the target string of commits with the commit at the tip of the
replacement string of commits.

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