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
           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.

       require_clean_work_tree <action> [<hint>]
           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
           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