init

script/internal/check-git.sh

@@ -0,0 +1,40 @@
+#!/bin/sh
+
+# Lowest version tested against :)
+expected_major=2
+expected_minor=11
+
+if [ -z "$(which git || exit 0)" ]; then
+  echo "Unable to find 'git' in the PATH"
+  exit 1
+fi
+
+# Get <major>.<minor>
+# Note:
+# - Use "-o" instead of "--only-matching" for compatibility
+# - Use "-E" instead of "--extended-regexp" for compatibility
+major_minor=$(git --version | grep -o -E '[0-9]+\.[0-9]+')
+if [ -z "$major_minor" ]; then
+  echo "Unable to determine git version. Expected output of 'git --version' to contain a version, for example '2.1'"
+  exit 1
+fi
+
+major=$(echo "$major_minor" | grep -o -E '^[0-9]+')
+minor=$(echo "$major_minor" | grep -o -E '[0-9]+$')
+
+# Higher major version
+if [ $major -gt $expected_major ]; then
+  exit 0
+fi
+
+# Lower major version
+if [ $major -lt $expected_major ]; then
+  echo "Git $expected_major.$expected_minor or higher must be in the PATH"
+  exit 1
+fi
+
+# Lower minor version
+if [ $minor -lt $expected_minor ]; then
+  echo "Git $expected_major.$expected_minor or higher must be in the PATH"
+  exit 1
+fi