Dynamically load Setuptools and Pip versions from ensurepip

The lookup table contained older versions of setuptools than what was
configured in ensurepip for the given version. By dynamically loading
the versions, it is guaranteed to keep in sync.

Author: vikahl

update.sh

@@ -25,23 +25,6 @@ declare -A gpgKeys=(
 	# https://www.python.org/dev/peps/pep-0664/#release-manager-and-crew
 )
 
-# https://github.com/docker-library/python/issues/365
-# https://pypi.org/project/pip/#history
-declare -A pipVersions=(
-	[3.11]='21.2' # https://github.com/python/cpython/blob/v3.11.0a1/Lib/ensurepip/__init__.py -- "_PIP_VERSION"
-	[3.10]='21.2' # https://github.com/python/cpython/blob/3.10/Lib/ensurepip/__init__.py -- "_PIP_VERSION"
-	[3.9]='21.2' # https://github.com/python/cpython/blob/3.9/Lib/ensurepip/__init__.py -- "_PIP_VERSION"
-	[3.8]='21.2' # historical
-	[3.7]='21.2' # historical
-)
-# https://pypi.org/project/setuptools/#history
-declare -A setuptoolsVersions=(
-	[3.11]='57' # https://github.com/python/cpython/blob/v3.11.0a1/Lib/ensurepip/__init__.py -- "_SETUPTOOLS_VERSION"
-	[3.10]='57' # https://github.com/python/cpython/blob/3.10/Lib/ensurepip/__init__.py -- "_SETUPTOOLS_VERSION"
-	[3.9]='57' # https://github.com/python/cpython/blob/3.9/Lib/ensurepip/__init__.py -- "_SETUPTOOLS_VERSION"
-	[3.8]='57' # historical
-	[3.7]='57' # historical
-)
 # https://pypi.org/project/wheel/#history
 # TODO wheelVersions: https://github.com/docker-library/python/issues/365#issuecomment-914669320
 
@@ -151,30 +134,8 @@ for version in "${versions[@]}"; do
 		exit 1
 	fi
 
-	pipVersion="${pipVersions[$rcVersion]}"
-	pipVersion="$(
-		export pipVersion
-		jq <<<"$pipJson" -r '
-			.releases
-			| [
-				keys_unsorted[]
-				| select(. == env.pipVersion or startswith(env.pipVersion + "."))
-			]
-			| max_by(split(".") | map(tonumber))
-		'
-	)"
-	setuptoolsVersion="${setuptoolsVersions[$rcVersion]}"
-	setuptoolsVersion="$(
-		export setuptoolsVersion
-		jq <<<"$setuptoolsJson" -r '
-			.releases
-			| [
-				keys_unsorted[]
-				| select(. == env.setuptoolsVersion or startswith(env.setuptoolsVersion + "."))
-			]
-			| max_by(split(".") | map(tonumber))
-		'
-	)"
+	pipVersion=$(curl -s "https://raw.githubusercontent.com/python/cpython/v$fullVersion/Lib/ensurepip/__init__.py" | sed -n -r 's/^_PIP_VERSION = "(.*?)"/\1/p')
+	setuptoolsVersion=$(curl -s "https://raw.githubusercontent.com/python/cpython/v$fullVersion/Lib/ensurepip/__init__.py" | sed -n -r 's/^_SETUPTOOLS_VERSION = "(.*?)"/\1/p')
 
 	echo "$version: $fullVersion (pip $pipVersion, setuptools $setuptoolsVersion)"