git-sh-setup - Common git shell script setup code
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.
exit after emitting the supplied error message to the standard error stream.
die with the usage message.
set the message that will be recorded to describe the end-user action in the reflog, when the script updates a ref.
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.
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).
runs chdir to the toplevel of the working tree.
checks if the repository is a bare repository, and dies if so. Used by scripts that require working tree (e.g. checkout).
outputs code for use with eval to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL and GIT_AUTHOR_DATE variables for a given commit.
Written by Linus Torvalds <email@example.com>
Documentation by Junio C Hamano and the git-list <firstname.lastname@example.org>.
Part of the linkgit:git suite