Anonymous committed 00754b2 Merge

Merge branch 'tr/doc-sh-setup' into maint

* tr/doc-sh-setup:
git-sh-setup: make require_clean_work_tree part of the interface

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 	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."
 	outputs code for use with eval to set the GIT_AUTHOR_NAME,
 	GIT_AUTHOR_EMAIL and GIT_AUTHOR_DATE variables for a given commit.