git-commit-vandalism/Documentation/git-merge-tree.txt

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git-merge-tree(1)
=================
NAME
----
merge-tree: implement real merges This adds the ability to perform real merges rather than just trivial merges (meaning handling three way content merges, recursive ancestor consolidation, renames, proper directory/file conflict handling, and so forth). However, unlike `git merge`, the working tree and index are left alone and no branch is updated. The only output is: - the toplevel resulting tree printed on stdout - exit status of 0 (clean), 1 (conflicts present), anything else (merge could not be performed; unknown if clean or conflicted) This output is meant to be used by some higher level script, perhaps in a sequence of steps like this: NEWTREE=$(git merge-tree --write-tree $BRANCH1 $BRANCH2) test $? -eq 0 || die "There were conflicts..." NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 -p $BRANCH2) git update-ref $BRANCH1 $NEWCOMMIT Note that higher level scripts may also want to access the conflict/warning messages normally output during a merge, or have quick access to a list of files with conflicts. That is not available in this preliminary implementation, but subsequent commits will add that ability (meaning that NEWTREE would be a lot more than a tree in the case of conflicts). This also marks the traditional trivial merge of merge-tree as deprecated. The trivial merge not only had limited applicability, the output format was also difficult to work with (and its format undocumented), and will generally be less performant than real merges. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-06-18 02:20:47 +02:00
git-merge-tree - Perform merge without touching index or working tree
SYNOPSIS
--------
[verse]
'git merge-tree' [--write-tree] [<options>] <branch1> <branch2>
merge-tree: implement real merges This adds the ability to perform real merges rather than just trivial merges (meaning handling three way content merges, recursive ancestor consolidation, renames, proper directory/file conflict handling, and so forth). However, unlike `git merge`, the working tree and index are left alone and no branch is updated. The only output is: - the toplevel resulting tree printed on stdout - exit status of 0 (clean), 1 (conflicts present), anything else (merge could not be performed; unknown if clean or conflicted) This output is meant to be used by some higher level script, perhaps in a sequence of steps like this: NEWTREE=$(git merge-tree --write-tree $BRANCH1 $BRANCH2) test $? -eq 0 || die "There were conflicts..." NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 -p $BRANCH2) git update-ref $BRANCH1 $NEWCOMMIT Note that higher level scripts may also want to access the conflict/warning messages normally output during a merge, or have quick access to a list of files with conflicts. That is not available in this preliminary implementation, but subsequent commits will add that ability (meaning that NEWTREE would be a lot more than a tree in the case of conflicts). This also marks the traditional trivial merge of merge-tree as deprecated. The trivial merge not only had limited applicability, the output format was also difficult to work with (and its format undocumented), and will generally be less performant than real merges. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-06-18 02:20:47 +02:00
'git merge-tree' [--trivial-merge] <base-tree> <branch1> <branch2> (deprecated)
merge-tree: implement real merges This adds the ability to perform real merges rather than just trivial merges (meaning handling three way content merges, recursive ancestor consolidation, renames, proper directory/file conflict handling, and so forth). However, unlike `git merge`, the working tree and index are left alone and no branch is updated. The only output is: - the toplevel resulting tree printed on stdout - exit status of 0 (clean), 1 (conflicts present), anything else (merge could not be performed; unknown if clean or conflicted) This output is meant to be used by some higher level script, perhaps in a sequence of steps like this: NEWTREE=$(git merge-tree --write-tree $BRANCH1 $BRANCH2) test $? -eq 0 || die "There were conflicts..." NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 -p $BRANCH2) git update-ref $BRANCH1 $NEWCOMMIT Note that higher level scripts may also want to access the conflict/warning messages normally output during a merge, or have quick access to a list of files with conflicts. That is not available in this preliminary implementation, but subsequent commits will add that ability (meaning that NEWTREE would be a lot more than a tree in the case of conflicts). This also marks the traditional trivial merge of merge-tree as deprecated. The trivial merge not only had limited applicability, the output format was also difficult to work with (and its format undocumented), and will generally be less performant than real merges. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-06-18 02:20:47 +02:00
[[NEWMERGE]]
DESCRIPTION
-----------
merge-tree: implement real merges This adds the ability to perform real merges rather than just trivial merges (meaning handling three way content merges, recursive ancestor consolidation, renames, proper directory/file conflict handling, and so forth). However, unlike `git merge`, the working tree and index are left alone and no branch is updated. The only output is: - the toplevel resulting tree printed on stdout - exit status of 0 (clean), 1 (conflicts present), anything else (merge could not be performed; unknown if clean or conflicted) This output is meant to be used by some higher level script, perhaps in a sequence of steps like this: NEWTREE=$(git merge-tree --write-tree $BRANCH1 $BRANCH2) test $? -eq 0 || die "There were conflicts..." NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 -p $BRANCH2) git update-ref $BRANCH1 $NEWCOMMIT Note that higher level scripts may also want to access the conflict/warning messages normally output during a merge, or have quick access to a list of files with conflicts. That is not available in this preliminary implementation, but subsequent commits will add that ability (meaning that NEWTREE would be a lot more than a tree in the case of conflicts). This also marks the traditional trivial merge of merge-tree as deprecated. The trivial merge not only had limited applicability, the output format was also difficult to work with (and its format undocumented), and will generally be less performant than real merges. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-06-18 02:20:47 +02:00
This command has a modern `--write-tree` mode and a deprecated
`--trivial-merge` mode. With the exception of the
<<DEPMERGE,DEPRECATED DESCRIPTION>> section at the end, the rest of
this documentation describes modern `--write-tree` mode.
Performs a merge, but does not make any new commits and does not read
from or write to either the working tree or index.
The performed merge will use the same feature as the "real"
linkgit:git-merge[1], including:
* three way content merges of individual files
* rename detection
* proper directory/file conflict handling
* recursive ancestor consolidation (i.e. when there is more than one
merge base, creating a virtual merge base by merging the merge bases)
* etc.
After the merge completes, a new toplevel tree object is created. See
`OUTPUT` below for details.
OPTIONS
-------
--[no-]messages::
Write any informational messages such as "Auto-merging <path>"
or CONFLICT notices to the end of stdout. If unspecified, the
default is to include these messages if there are merge
conflicts, and to omit them otherwise.
merge-tree: implement real merges This adds the ability to perform real merges rather than just trivial merges (meaning handling three way content merges, recursive ancestor consolidation, renames, proper directory/file conflict handling, and so forth). However, unlike `git merge`, the working tree and index are left alone and no branch is updated. The only output is: - the toplevel resulting tree printed on stdout - exit status of 0 (clean), 1 (conflicts present), anything else (merge could not be performed; unknown if clean or conflicted) This output is meant to be used by some higher level script, perhaps in a sequence of steps like this: NEWTREE=$(git merge-tree --write-tree $BRANCH1 $BRANCH2) test $? -eq 0 || die "There were conflicts..." NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 -p $BRANCH2) git update-ref $BRANCH1 $NEWCOMMIT Note that higher level scripts may also want to access the conflict/warning messages normally output during a merge, or have quick access to a list of files with conflicts. That is not available in this preliminary implementation, but subsequent commits will add that ability (meaning that NEWTREE would be a lot more than a tree in the case of conflicts). This also marks the traditional trivial merge of merge-tree as deprecated. The trivial merge not only had limited applicability, the output format was also difficult to work with (and its format undocumented), and will generally be less performant than real merges. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-06-18 02:20:47 +02:00
[[OUTPUT]]
OUTPUT
------
For a successful merge, the output from git-merge-tree is simply one
line:
<OID of toplevel tree>
Whereas for a conflicted merge, the output is by default of the form:
merge-tree: implement real merges This adds the ability to perform real merges rather than just trivial merges (meaning handling three way content merges, recursive ancestor consolidation, renames, proper directory/file conflict handling, and so forth). However, unlike `git merge`, the working tree and index are left alone and no branch is updated. The only output is: - the toplevel resulting tree printed on stdout - exit status of 0 (clean), 1 (conflicts present), anything else (merge could not be performed; unknown if clean or conflicted) This output is meant to be used by some higher level script, perhaps in a sequence of steps like this: NEWTREE=$(git merge-tree --write-tree $BRANCH1 $BRANCH2) test $? -eq 0 || die "There were conflicts..." NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 -p $BRANCH2) git update-ref $BRANCH1 $NEWCOMMIT Note that higher level scripts may also want to access the conflict/warning messages normally output during a merge, or have quick access to a list of files with conflicts. That is not available in this preliminary implementation, but subsequent commits will add that ability (meaning that NEWTREE would be a lot more than a tree in the case of conflicts). This also marks the traditional trivial merge of merge-tree as deprecated. The trivial merge not only had limited applicability, the output format was also difficult to work with (and its format undocumented), and will generally be less performant than real merges. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-06-18 02:20:47 +02:00
<OID of toplevel tree>
<Conflicted file list>
<Informational messages>
These are discussed individually below.
merge-tree: implement real merges This adds the ability to perform real merges rather than just trivial merges (meaning handling three way content merges, recursive ancestor consolidation, renames, proper directory/file conflict handling, and so forth). However, unlike `git merge`, the working tree and index are left alone and no branch is updated. The only output is: - the toplevel resulting tree printed on stdout - exit status of 0 (clean), 1 (conflicts present), anything else (merge could not be performed; unknown if clean or conflicted) This output is meant to be used by some higher level script, perhaps in a sequence of steps like this: NEWTREE=$(git merge-tree --write-tree $BRANCH1 $BRANCH2) test $? -eq 0 || die "There were conflicts..." NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 -p $BRANCH2) git update-ref $BRANCH1 $NEWCOMMIT Note that higher level scripts may also want to access the conflict/warning messages normally output during a merge, or have quick access to a list of files with conflicts. That is not available in this preliminary implementation, but subsequent commits will add that ability (meaning that NEWTREE would be a lot more than a tree in the case of conflicts). This also marks the traditional trivial merge of merge-tree as deprecated. The trivial merge not only had limited applicability, the output format was also difficult to work with (and its format undocumented), and will generally be less performant than real merges. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-06-18 02:20:47 +02:00
[[OIDTLT]]
OID of toplevel tree
~~~~~~~~~~~~~~~~~~~~
This is a tree object that represents what would be checked out in the
working tree at the end of `git merge`. If there were conflicts, then
files within this tree may have embedded conflict markers.
[[CFI]]
Conflicted file list
~~~~~~~~~~~~~~~~~~~~
This is a sequence of lines containing a filename on each line, quoted
as explained for the configuration variable `core.quotePath` (see
linkgit:git-config[1]).
[[IM]]
Informational messages
~~~~~~~~~~~~~~~~~~~~~~
This always starts with a blank line to separate it from the previous
section, and then has free-form messages about the merge, such as:
* "Auto-merging <file>"
* "CONFLICT (rename/delete): <oldfile> renamed...but deleted in..."
* "Failed to merge submodule <submodule> (<reason>)"
* "Warning: cannot merge binary files: <filename>"
merge-tree: implement real merges This adds the ability to perform real merges rather than just trivial merges (meaning handling three way content merges, recursive ancestor consolidation, renames, proper directory/file conflict handling, and so forth). However, unlike `git merge`, the working tree and index are left alone and no branch is updated. The only output is: - the toplevel resulting tree printed on stdout - exit status of 0 (clean), 1 (conflicts present), anything else (merge could not be performed; unknown if clean or conflicted) This output is meant to be used by some higher level script, perhaps in a sequence of steps like this: NEWTREE=$(git merge-tree --write-tree $BRANCH1 $BRANCH2) test $? -eq 0 || die "There were conflicts..." NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 -p $BRANCH2) git update-ref $BRANCH1 $NEWCOMMIT Note that higher level scripts may also want to access the conflict/warning messages normally output during a merge, or have quick access to a list of files with conflicts. That is not available in this preliminary implementation, but subsequent commits will add that ability (meaning that NEWTREE would be a lot more than a tree in the case of conflicts). This also marks the traditional trivial merge of merge-tree as deprecated. The trivial merge not only had limited applicability, the output format was also difficult to work with (and its format undocumented), and will generally be less performant than real merges. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-06-18 02:20:47 +02:00
EXIT STATUS
-----------
For a successful, non-conflicted merge, the exit status is 0. When the
merge has conflicts, the exit status is 1. If the merge is not able to
complete (or start) due to some kind of error, the exit status is
something other than 0 or 1 (and the output is unspecified).
USAGE NOTES
-----------
This command is intended as low-level plumbing, similar to
linkgit:git-hash-object[1], linkgit:git-mktree[1],
linkgit:git-commit-tree[1], linkgit:git-write-tree[1],
linkgit:git-update-ref[1], and linkgit:git-mktag[1]. Thus, it can be
used as a part of a series of steps such as:
NEWTREE=$(git merge-tree --write-tree $BRANCH1 $BRANCH2)
test $? -eq 0 || die "There were conflicts..."
NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 -p $BRANCH2)
git update-ref $BRANCH1 $NEWCOMMIT
Note that when the exit status is non-zero, `NEWTREE` in this sequence
will contain a lot more output than just a tree.
merge-tree: implement real merges This adds the ability to perform real merges rather than just trivial merges (meaning handling three way content merges, recursive ancestor consolidation, renames, proper directory/file conflict handling, and so forth). However, unlike `git merge`, the working tree and index are left alone and no branch is updated. The only output is: - the toplevel resulting tree printed on stdout - exit status of 0 (clean), 1 (conflicts present), anything else (merge could not be performed; unknown if clean or conflicted) This output is meant to be used by some higher level script, perhaps in a sequence of steps like this: NEWTREE=$(git merge-tree --write-tree $BRANCH1 $BRANCH2) test $? -eq 0 || die "There were conflicts..." NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 -p $BRANCH2) git update-ref $BRANCH1 $NEWCOMMIT Note that higher level scripts may also want to access the conflict/warning messages normally output during a merge, or have quick access to a list of files with conflicts. That is not available in this preliminary implementation, but subsequent commits will add that ability (meaning that NEWTREE would be a lot more than a tree in the case of conflicts). This also marks the traditional trivial merge of merge-tree as deprecated. The trivial merge not only had limited applicability, the output format was also difficult to work with (and its format undocumented), and will generally be less performant than real merges. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-06-18 02:20:47 +02:00
[[DEPMERGE]]
DEPRECATED DESCRIPTION
----------------------
Per the <<NEWMERGE,DESCRIPTION>> and unlike the rest of this
documentation, this section describes the deprecated `--trivial-merge`
mode.
Other than the optional `--trivial-merge`, this mode accepts no
options.
This mode reads three tree-ish, and outputs trivial merge results and
conflicting stages to the standard output in a semi-diff format.
Since this was designed for higher level scripts to consume and merge
the results back into the index, it omits entries that match
<branch1>. The result of this second form is similar to what
three-way 'git read-tree -m' does, but instead of storing the results
in the index, the command outputs the entries to the standard output.
This form not only has limited applicability (a trivial merge cannot
handle content merges of individual files, rename detection, proper
directory/file conflict handling, etc.), the output format is also
difficult to work with, and it will generally be less performant than
the first form even on successful merges (especially if working in
large repositories).
GIT
---
Part of the linkgit:git[1] suite