Add Python 3.7/alpine3.8

[tao12345666333]

Add Alpine 3.8 and change openssl to libressl. Because Alpine 3.8 updated libressl to 2.7.4-r0 which Python 3.7's ssl module can compatible with it.

Now the official Alpine 3.8 is not not available. gliderlabs/docker-alpine#418

So I build one Alpine 3.8 image locally and test this change.

~ # cat /etc/os-release
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.8.0
PRETTY_NAME="Alpine Linux v3.8"
HOME_URL="http://alpinelinux.org"
BUG_REPORT_URL="http://bugs.alpinelinux.org"
~ # python
Python 3.7.0 (default, Jul  6 2018, 06:55:30)
[GCC 6.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.                                                           
>>> import ssl
>>> ssl.OPENSSL_VERSION
'LibreSSL 2.7.4'

After the Alpine 3.8 image be available, I will change .travis.yml

Fixes #300

[tao12345666333]

The Alpine 3.8 image has been available. Updated .travis.yml.

[JayH5]

@tao12345666333

You'll need #304 and to update update.sh with something like:

diff --git a/update.sh b/update.sh
index 11683d6..7f53640 100755
--- a/update.sh
+++ b/update.sh
@@ -112,7 +112,7 @@ for version in "${versions[@]}"; do
 	echo "$version: $fullVersion"
 
 	for v in \
-		alpine{3.6,3.7} \
+		alpine{3.6,3.7,3.8} \
 		{wheezy,jessie,stretch}{/slim,/onbuild,} \
 		windows/nanoserver-{1709,sac2016} \
 		windows/windowsservercore-{1709,ltsc2016} \
@@ -154,8 +154,8 @@ for version in "${versions[@]}"; do
 		esac
 
 		# https://bugs.python.org/issue32598 (Python 3.7.0b1+)
-		# TL;DR: Python 3.7+ uses OpenSSL functionality which LibreSSL doesn't implement (yet?)
-		if [[ "$version" == 3.7* ]] && [[ "$variant" == alpine* ]]; then
+		# TL;DR: Python 3.7+ uses OpenSSL functionality which LibreSSL 2.6 in Alpine 3.7 doesn't implement
+		if [[ "$version" == 3.7* ]] && [[ "$variant" == alpine3.7 ]]; then
 			sed -ri -e 's/libressl/openssl/g' "$dir/Dockerfile"
 		fi
 

A Python 2.7/Alpine 3.8 image would be cool too 🙋🏼‍♂️

[tao12345666333]

@JayH5 Thanks. I have updated it.

[lorddaedra]

Should be alpine3.8 instead of alpine3.7, isn't it?

[tao12345666333]

@lorddaedra It isn't. On alpine3.8 we can use libressl , the package's version is 2.7.x.

[lorddaedra]

looks like, you are right...

then we should merge this PR...

do we have any reasons to wait for anything?..

[pvizeli]

Can we have also python 3.6 with alpine 3.8 ?

[tao12345666333]

@pvizeli Yes, we can. I'll be doing one shortly. tao12345666333@779ac26 After my test finish. See #311 .

[tianon]

#311 👍