'\" t
.\"     Title: git-sh-setup
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets v1.79.2 <http://docbook.sf.net/>
.\"      Date: 2025-09-23
.\"    Manual: Git Manual
.\"    Source: Git 2.51.0.315.gbb69721404
.\"  Language: English
.\"
.TH "GIT\-SH\-SETUP" "1" "2025-09-23" "Git 2\&.51\&.0\&.315\&.gbb6972" "Git Manual"
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.SH "NAME"
git-sh-setup \- Common Git shell script setup code
.SH "SYNOPSIS"
.sp
.nf
\fI\&. "$(git \-\-exec\-path)/git\-sh\-setup"\fR
.fi
.SH "DESCRIPTION"
.sp
This is not a command the end user would want to run\&. Ever\&. This documentation is meant for people who are studying the Porcelain\-ish scripts and/or are writing new ones\&.
.sp
The \fIgit sh\-setup\fR scriptlet is designed to be sourced (using \&.) by other shell scripts to set up some variables pointing at the normal Git directories and a few helper shell functions\&.
.sp
Before sourcing it, your script should set up a few variables; \fBUSAGE\fR (and \fBLONG_USAGE\fR, if any) is used to define the message given by \fBusage\fR() shell function\&. \fBSUBDIRECTORY_OK\fR can be set if the script can run from a subdirectory of the working tree (some commands do not)\&.
.sp
The scriptlet sets \fBGIT_DIR\fR and \fBGIT_OBJECT_DIRECTORY\fR shell variables, but does \fBnot\fR export them to the environment\&.
.SH "FUNCTIONS"
.PP
die
.RS 4
exit after emitting the supplied error message to the standard error stream\&.
.RE
.PP
usage
.RS 4
die with the usage message\&.
.RE
.PP
set_reflog_action
.RS 4
Set
\fBGIT_REFLOG_ACTION\fR
environment to a given string (typically the name of the program) unless it is already set\&. Whenever the script runs a
\fBgit\fR
command that updates refs, a reflog entry is created using the value of this string to leave the record of what command updated the ref\&.
.RE
.PP
git_editor
.RS 4
runs an editor of user\(cqs choice (GIT_EDITOR, core\&.editor, VISUAL or EDITOR) on a given file, but error out if no editor is specified and the terminal is dumb\&.
.RE
.PP
is_bare_repository
.RS 4
outputs
\fBtrue\fR
or
\fBfalse\fR
to the standard output stream to indicate if the repository is a bare repository (i\&.e\&. without an associated working tree)\&.
.RE
.PP
cd_to_toplevel
.RS 4
runs chdir to the toplevel of the working tree\&.
.RE
.PP
require_work_tree
.RS 4
checks if the current directory is within the working tree of the repository, and otherwise dies\&.
.RE
.PP
require_work_tree_exists
.RS 4
checks if the working tree associated with the repository exists, and otherwise dies\&. Often done before calling cd_to_toplevel, which is impossible to do if there is no working tree\&.
.RE
.PP
require_clean_work_tree <action> [<hint>]
.RS 4
checks that the working tree and index associated with the repository have no uncommitted changes to tracked files\&. Otherwise it emits an error message of the form
\fBCannot\fR
\fI<action>\fR\fB:\fR
\fI<reason>\fR\&.
\fI<hint>\fR, and dies\&. Example:
.sp
.if n \{\
.RS 4
.\}
.nf
require_clean_work_tree rebase "Please commit or stash them\&."
.fi
.if n \{\
.RE
.\}
.RE
.PP
get_author_ident_from_commit
.RS 4
outputs code for use with eval to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL and GIT_AUTHOR_DATE variables for a given commit\&.
.RE
.PP
create_virtual_base
.RS 4
modifies the first file so only lines in common with the second file remain\&. If there is insufficient common material, then the first file is left empty\&. The result is suitable as a virtual base input for a 3\-way merge\&.
.RE
.SH "GIT"
.sp
Part of the \fBgit\fR(1) suite