Provide branch information for both Emacs and Tramp (Bug#33328)

* doc/lispref/intro.texi (Version Info):
Document `emacs-repository-version' and `emacs-repository-branch'.

* etc/NEWS: Mention `emacs-repository-branch'.

* lisp/loadup.el: Initialize `emacs-repository-branch'.

* lisp/version.el (emacs-repository-branch): New variable.
(emacs-repository-branch-git, emacs-repository-get-branch):
New defuns.

* lisp/mail/emacsbug.el (report-emacs-bug):
Insert `emacs-repository-branch'.

* lisp/net/tramp.el (tramp-get-local-gid):
Use `group-name' if available.
(tramp-debug-message):
* lisp/net/tramp-cmds.el (tramp-bug): Report also
`tramp-repository-branch' and `tramp-repository-version'.

* lisp/net/trampver.el (tramp-repository-branch)
(tramp-repository-version): New defconst.
(tramp-repository-get-version): Remove.

1 files changed, 12 insertions, 0 deletions

diff --git a/doc/lispref/intro.texi b/doc/lispref/intro.texi
index 197f54ecc52..2353cf956cc 100644
--- a/doc/lispref/intro.texi
+++ b/doc/lispref/intro.texi
@@ -530,6 +530,18 @@ directory (without cleaning).  This is only of relevance when
 developing Emacs.
 @end defvar
 
+@defvar emacs-repository-version
+A string that gives the repository revision from which Emacs was
+built.  If Emacs was built outside revision control, the value is
+@code{nil}.
+@end defvar
+
+@defvar emacs-repository-branch
+A string that gives the repository branch from which Emacs was built.
+In the most cases this is @code{"master"}.  If Emacs was built outside
+revision control, the value is @code{nil}.
+@end defvar
+
 @node Acknowledgments
 @section Acknowledgments