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[core] Offline work-around for GnuTLS Emacs bug 

This assumes that gnutls-cli is available on the system. The work-around won't
be applied if this executable is not available.
This commit is contained in:
syl20bnr 2019-08-22 15:11:01 -04:00
parent 8e469cb391
commit 427c01c27a
1 changed files with 20 additions and 9 deletions
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29
core/core-emacs-backports.el
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@ -15,15 +15,26 @@
(when (and (version< "25" emacs-version)
(version< emacs-version "26.3"))
;; Hack to prevent TLS error with Emacs 26.1 and 26.2 and gnutls 3.6.4 and above
;; see https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34341
(ignore-errors
(message "Testing if your Emacs version needs the TLS work-around...")
(message "More info at https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34341")
(with-current-buffer (url-retrieve-synchronously "https://api.github.com/users/syl20bnr/repos")
(when (string-empty-p (buffer-string))
(message "Your Emacs and GnutTLS versions need the work-around, applying it...")
(setq gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3")))))
;; Hack to prevent TLS error with Emacs 26.1 and 26.2 and gnutls 3.6.4 and
;; above see https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34341
(message (concat "Testing if your Emacs version %s and GnuTLS version "
"need the TLS work-around...")
emacs-version)
(message "More info at https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34341")
(let ((stime (current-time)))
(with-temp-buffer
(ignore-errors (call-process "gnutls-cli" nil t nil "--version"))
(unless (string-empty-p (buffer-string))
(goto-char (point-min))
(let ((gnutls-version-line (thing-at-point 'line t)))
(when (string-match ".*\\([0-9]+\\.[0-9]+\\.[0-9]+\\).*"
gnutls-version-line)
(let ((gnutls-version (match-string 1 gnutls-version-line)))
(unless (version<= gnutls-version "3.6.3")
(message (concat "Your Emacs version %s and GnutTLS version %s "
"need the work-around, applying it...")
emacs-version gnutls-version)
(setq gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3")))))))))
(when (version< emacs-version "26")
;; backport fix for macOS battery status