updated install_golang.sh

install/install_golang.sh

@@ -17,8 +17,32 @@
 
 set -euo pipefail
 [ -n "${DEBUG:-}" ] && set -x
+srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
-version="${1:-1.15.6}"
+# shellcheck disable=SC1090,SC1091
+. "$srcdir/../lib/utils.sh"
+
+# shellcheck disable=SC2034,SC2154
+usage_description="
+Installs Golang to ~/bin
+
+Uses GitHub CLI (installs it if not already installed
+"
+
+# used by usage() in lib/utils.sh
+# shellcheck disable=SC2034
+usage_args="[<version>]"
+
+export PATH="$PATH:$HOME/bin"
+
+help_usage "$@"
+
+max_args 1 "$@"
+
+#version="${1:-1.15.6}"
+version="${1:-latest}"
+
+owner_repo="golang/go"
 
 install_location=~/bin
 
@@ -26,12 +50,33 @@ uname_s="$(uname -s | tr '[:upper:]' '[:lower:]')"
 
 tmp_tar="$(mktemp)"
 
+if [ "$version" = latest ]; then
+    timestamp "determining latest version of '$owner_repo' via GitHub CLI API"
+    # Golang has no GitHub releases but all tags
+    #version="$("$srcdir/github_repo_latest_release.sh" "$owner_repo")"
+    type -P gh &>/dev/null || "$srcdir/install_github_cli.sh"
+    version="$(gh api "repos/$owner_repo/tags" \
+                --jq '
+                    .[] |
+                    select(.name | test("^go[0-9]")) |
+                    .name
+                ' --paginate |
+                head -n1 |
+                sed 's/^go//' || :)"
+    if [ -z "$version" ]; then
+        die "Failed to determine latest version of $owner_repo"
+    fi
+    timestamp "latest version is '$version'"
+else
+    is_semver "$version" || die "non-semver version argument given: '$version' - should be in format: N.N.N"
+fi
+
 url="https://golang.org/dl/go$version.$uname_s-amd64.tar.gz"
 
 mkdir -p -v "$install_location"
 
 echo "$(date '+%F %T')  Downloading $url"
-wget -cqO "$tmp_tar" "$url"
+wget -cO "$tmp_tar" "$url"
 
 echo "$(date '+%F %T')  Unpacking to $install_location"
 tar zxf "$tmp_tar" -C "$install_location"