2 .\" Title: git-sh-setup
3 .\" Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
4 .\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
7 .\" Source: Git 2.42.0.176.gd6c51973e4
10 .TH "GIT\-SH\-SETUP" "1" "2023\-09\-13" "Git 2\&.42\&.0\&.176\&.gd6c519" "Git Manual"
11 .\" -----------------------------------------------------------------
12 .\" * Define some portability stuff
13 .\" -----------------------------------------------------------------
14 .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
15 .\" http://bugs.debian.org/507673
16 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
17 .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 .\" -----------------------------------------------------------------
21 .\" * set default formatting
22 .\" -----------------------------------------------------------------
23 .\" disable hyphenation
25 .\" disable justification (adjust text to left margin only)
27 .\" -----------------------------------------------------------------
28 .\" * MAIN CONTENT STARTS HERE *
29 .\" -----------------------------------------------------------------
31 git-sh-setup \- Common Git shell script setup code
35 \fI\&. "$(git \-\-exec\-path)/git\-sh\-setup"\fR
40 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\&.
42 The \fIgit sh\-setup\fR scriptlet is designed to be sourced (using \fB\&.\fR) by other shell scripts to set up some variables pointing at the normal Git directories and a few helper shell functions\&.
44 Before sourcing it, your script should set up a few variables; \fBUSAGE\fR (and \fBLONG_USAGE\fR, if any) is used to define 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)\&.
46 The scriptlet sets \fBGIT_DIR\fR and \fBGIT_OBJECT_DIRECTORY\fR shell variables, but does \fBnot\fR export them to the environment\&.
51 exit after emitting the supplied error message to the standard error stream\&.
56 die with the usage message\&.
62 \fBGIT_REFLOG_ACTION\fR
63 environment to a given string (typically the name of the program) unless it is already set\&. Whenever the script runs a
65 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\&.
70 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\&.
79 to the standard output stream to indicate if the repository is a bare repository (i\&.e\&. without an associated working tree)\&.
84 runs chdir to the toplevel of the working tree\&.
89 checks if the current directory is within the working tree of the repository, and otherwise dies\&.
92 require_work_tree_exists
94 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\&.
97 require_clean_work_tree <action> [<hint>]
99 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
100 \fBCannot <action>: <reason>\&. <hint>\fR, and dies\&. Example:
106 require_clean_work_tree rebase "Please commit or stash them\&."
114 get_author_ident_from_commit
116 outputs code for use with eval to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL and GIT_AUTHOR_DATE variables for a given commit\&.
121 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\&.
125 Part of the \fBgit\fR(1) suite