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download PDF document: git-sh-setup.1.pdf

GIT-SH-SETUP(1) Git Manual GIT-SH-SETUP(1)
NAME git-sh-setup - Common Git shell script setup code
SYNOPSIS . "$(git --exec-path)/git-sh-setup"

DESCRIPTION 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.
The git sh-setup 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.
Before sourcing it, your script should set up a few variables; USAGE (and LONG_USAGE, if any) is used to define message given by usage() shell function. SUBDIRECTORY_OK can be set if the script can run from a subdirectory of the working tree (some commands do not).
The scriptlet sets GIT_DIR and GIT_OBJECT_DIRECTORY shell variables, but does not export them to the environment.
FUNCTIONS die exit after emitting the supplied error message to the standard error stream.
usage die with the usage message.
set_reflog_action Set GIT_REFLOG_ACTION environment to a given string (typically the name of the program) unless it is already set. Whenever the script runs a git 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.
git_editor runs an editor of user's 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.
is_bare_repository outputs true or false to the standard output stream to indicate if the repository is a bare repository (i.e. without an associated working tree).
cd_to_toplevel runs chdir to the toplevel of the working tree.
require_work_tree checks if the current directory is within the working tree of the repository, and otherwise dies.
require_work_tree_exists it emits an error message of the form Cannot <action>: <reason>. <hint>, and dies. Example:
require_clean_work_tree rebase "Please commit or stash them."

get_author_ident_from_commit outputs code for use with eval to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL and GIT_AUTHOR_DATE variables for a given commit.
create_virtual_base 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.
GIT Part of the git(1) suite
Git 2.42.0 2023-08-21 GIT-SH-SETUP(1)