community/salt: fix python3.8 incompattibilities

Salt is not compattible with Python 3.8 yet[0], so salt-minion is broken on
Alpine Linux since v3.10.

Patch the grain code to be compattible with Python 3.8.

Fixes #10979

[0]: saltstack/salt#55310

community/salt/APKBUILD

@@ -3,13 +3,13 @@
 # Maintainer: Kevin Daudt <kdaudt@alpinelinux.org>
 pkgname=salt
 pkgver=2019.2.0
-pkgrel=3
+pkgrel=4
 pkgdesc="A parallel remote execution system"
 url="https://github.com/saltstack/salt"
 arch="noarch !s390x"
 license="Apache-2.0"
 depends="py3-tornado py3-yaml py3-jinja2 py3-markupsafe py3-msgpack py3-crypto py3-zmq
-	py3-six py3-requests py3-pygit2 py3-dateutil procps"
+	py3-distro py3-six py3-requests py3-pygit2 py3-dateutil procps"
 makedepends="python3-dev py3-libcloud"
 subpackages="$pkgname-doc
 	$pkgname-master $pkgname-master-openrc:master_openrc
@@ -26,6 +26,7 @@ source="https://pypi.io/packages/source/s/salt/salt-$pkgver.tar.gz
 	salt-minion.initd
 	salt-syndic.confd
 	salt-syndic.initd
+	fix-grains-dist-detection.patch
 	"
 options="!check" # depends on pytestsalt
 builddir="$srcdir/$pkgname-$pkgver"
@@ -157,4 +158,5 @@ cfbbeb8023a383e7c42d84e3346edfd068c9ec7650c4ddc3caa38534da325a67497e1f06ca02cc1f
 0051e13351cef8db81dc075a194bb384723f07d5591b5b4d3f3adf4180afaf7beced470ab79ceca9d1ec0dae62dbd72084eb76af009fc78411a011050a94a2ed  salt-minion.confd
 31521a7bf9455a805652ebb2c2a258148d654169caed500dbf1fe0c26baf26b330217117fe84a13706ded75a9eedadc0bbd671ede0957ed4d60d1e766fea6b39  salt-minion.initd
 bafc6ea10cdafd0aef868feb35aecbe4ae6a7dff0ae42862bded85715ad763eb89e1ed27437866a7e5f2b9f7064e3c2a3fb59814487744ba4227238d95cf3818  salt-syndic.confd
-d71133e834685304e0167554035ebbc861252f972bbe981cc71e45b70f15d94a28a02a369463c9a641372919689f96b62a0408b14f824ad986d536e52b1e5ec0  salt-syndic.initd"
+d71133e834685304e0167554035ebbc861252f972bbe981cc71e45b70f15d94a28a02a369463c9a641372919689f96b62a0408b14f824ad986d536e52b1e5ec0  salt-syndic.initd
+c61280af9db7bb1551c5c80901d455ea074859cc5b6615e5caba694f5a2188e37e0a85ca2491e233861162da534599f9e455dc93a95b7741fbcf9508e7498ae9  fix-grains-dist-detection.patch"

community/salt/fix-grains-dist-detection.patch

@@ -0,0 +1,46 @@
+python 3.8 removed linux_distribution support completely and leaves that
+functionality to third-party modules, which is provided by 'distro'.
+
+Just completely remove the backwards compatibility and completely rely on that
+module.
+
+diff --git a/salt/grains/core.py b/salt/grains/core.py
+index f05276c..58edaee 100644
+--- a/salt/grains/core.py
++++ b/salt/grains/core.py
+@@ -22,6 +22,7 @@ import locale
+ import uuid
+ from errno import EACCES, EPERM
+ import datetime
++from distro import linux_distribution
+
+ # pylint: disable=import-error
+ try:
+@@ -33,18 +34,6 @@ except ImportError:
+ __proxyenabled__ = ['*']
+ __FQDN__ = None
+
+-# Extend the default list of supported distros. This will be used for the
+-# /etc/DISTRO-release checking that is part of linux_distribution()
+-from platform import _supported_dists
+-_supported_dists += ('arch', 'mageia', 'meego', 'vmware', 'bluewhite64',
+-                     'slamd64', 'ovs', 'system', 'mint', 'oracle', 'void')
+-
+-# linux_distribution deprecated in py3.7
+-try:
+-    from platform import linux_distribution
+-except ImportError:
+-    from distro import linux_distribution
+-
+ # Import salt libs
+ import salt.exceptions
+ import salt.log
+@@ -1871,7 +1860,7 @@ def os_data():
+         )
+         (osname, osrelease, oscodename) = \
+             [x.strip('"').strip("'") for x in
+-             linux_distribution(supported_dists=_supported_dists)]
++             linux_distribution()]
+         # Try to assign these three names based on the lsb info, they tend to
+         # be more accurate than what python gets from /etc/DISTRO-release.
+         # It's worth noting that Ubuntu has patched their Python distribution