Fixes <http://bugs.gnu.org/22937>.
Reported by Chris Marusich <cmmarusich@gmail.com>.
* guix/scripts/substitute.scm (fetch): Add 'https' alongside 'http'.
Use 'open-connection-for-uri' instead of 'open-socket-for-uri'. Call
'setvbuf' only when PORT matches 'file-port?'.
(http-multiple-get): Likewise. Change 'base-url' parameter to
'base-uri'.
(fetch-narinfos)[do-fetch]: Add 'https' case alongside 'http'. Pass URI
instead of URL to 'http-multiple-get'.
* doc/guix.texi (Requirements): Move GnuTLS one level higher and mention
HTTPS substitutes.
(Substitutes): Mention HTTPS and recommend it. Explain why servers
are not authenticated. Add "On Trusting Binaries" subsection.
9b7bd1b160