Introduce customizable variable 'package-gnupghome-dir'

* lisp/emacs-lisp/package.el (package-import-keyring)
(package--check-signature-content, package-check-signature):
Use new variable package-gnupghome-dir to control which GnuPG
homedir to use.
* doc/emacs/package.texi: Mention package-gnupghome-dir.
* etc/NEWS: Mention package-gnupghome-dir.

1 files changed, 7 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index b36db07360b..3c328ac58a2 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -644,6 +644,13 @@ In 'visual-line-mode' it will look for the true beginning of a header
 while in non-'visual-line-mode' it will move the point to the indented
 header's value.
 
+** Package
+
++++
+*** The new variable 'package-gnupghome-dir' has been added to control
+where the GnuPG home directory (used for signature verification) is
+located and whether GnuPG's option "--homedir" is used or not.
+
 ** Tramp
 
 +++