stable and oldstable aliases

src/install-go

@@ -30,7 +30,12 @@ if [ -d "$target_dir" ]; then
   fi
 fi
 
-[ -n "$skip_install" ] || install_go "$install_go_version" "$target_dir"
+if [ -z "$skip_install" ]; then
+  tmp_dir="$(tmpdir_name tmp)"
+  trap 'rm -rf -- "$tmp_dir"' EXIT
+  mkdir -p -- "$tmp_dir"
+  install_go "$install_go_version" "$target_dir" "$tmp_dir"
+fi
 
 GITHUB_ENV="${GITHUB_ENV:-/dev/null}"
 GITHUB_PATH="${GITHUB_PATH:-/dev/null}"

src/lib

@@ -111,14 +111,11 @@ version_archive_name() {
   echo "$version.$(system_os "$system")-$(system_arch "$system")$extension"
 }
 
-init_tmpdir() {
+tmpdir_name() {
+  local dir_name="${1:-"tmp"}"
   local tmpdir="$RUNNER_WORKSPACE"
   tmpdir="${tmpdir:-"$TMPDIR"}"
-  tmpdir="$tmpdir/setup-go-faster/tmp"
-  mkdir -p "$tmpdir"
-  rm -rf "$tmpdir"
-  mkdir -p "$tmpdir"
-  trap 'rm -rf "$tmpdir"' EXIT
+  tmpdir="$tmpdir/setup-go-faster/$dir_name"
   echo "$tmpdir"
 }
 
@@ -132,6 +129,7 @@ download_go_url() {
 install_go() {
   local go_version="${1#go}"
   local target_dir="$2"
+  local tmpdir="$3"
   debug_out "installing go $go_version to $target_dir"
   local system
   system="$(go_system)"
@@ -141,7 +139,6 @@ install_go() {
   fi
   rm -rf "$target_dir"
   mkdir -p "$(dirname "$target_dir")"
-  tmpdir="$(init_tmpdir)"
   cd "$tmpdir"
 
   archive_name="$(version_archive_name go"$go_version" "$system")"
@@ -261,3 +258,40 @@ select_go_version_from_file() {
 
   normalize_go_version "$found_version"
 }
+
+get_known_versions() {
+  local versions_url="$1"
+  local tmp_dir="$2"
+  local file="$tmp_dir/versions.txt"
+  if [ -f "$file" ]; then
+    cat "$file"
+    return
+  fi
+  curl --retry 4 -s --fail -o "$file" "$versions_url"
+  cat "$file"
+}
+
+get_stable_minor_version() {
+  local versions_url="$1"
+  local tmp_dir="$2"
+  local versions
+  get_known_versions "$versions_url" "$tmp_dir" | grep -E '^go1\.[0-9]+(\.[0-9]+)?$' | head -1 | awk -F. '{print $2}'
+}
+
+resolve_constraint_alias() {
+  local constraint="$1"
+  local versions_url="$2"
+  local tmp_dir="$3"
+  case "$constraint" in
+    stable)
+      echo "1.$(get_stable_minor_version "$versions_url" "$tmp_dir").x"
+      ;;
+    oldstable)
+      minor_version="$(get_stable_minor_version "$versions_url" "$tmp_dir")"
+      echo "1.$((minor_version - 1)).x"
+      ;;
+    *)
+      echo "$constraint"
+      ;;
+  esac
+}

src/lib_test.sh

@@ -8,6 +8,10 @@ setUp() {
   . src/lib
 }
 
+# Nothing special about this one. It just happens to be HEAD of main when writing this.
+# Most recent version is go1.21rc4
+STABLE_VERSIONS_URL="https://raw.githubusercontent.com/WillAbides/goreleases/077db58ac86a8a2fb63c90817090e132eded0f3d/versions.txt"
+
 test_homedir() {
   (
     export USERPROFILE="windows home"
@@ -166,4 +170,10 @@ test_supported_system() {
 
 }
 
+test_resolve_constraint_alias() {
+  assertEquals "1.20.x" "$(resolve_constraint_alias "stable" "$STABLE_VERSIONS_URL" "$SHUNIT_TMPDIR")"
+  assertEquals "1.19.x" "$(resolve_constraint_alias "oldstable" "$STABLE_VERSIONS_URL" "$SHUNIT_TMPDIR")"
+  assertEquals "xxx" "$(resolve_constraint_alias "xxx" "$STABLE_VERSIONS_URL" "$SHUNIT_TMPDIR")"
+}
+
 . ./external/shunit2

src/lib_test_long.sh

@@ -14,10 +14,12 @@ test_install_go() {
     RUNNER_TEMP="${RUNNER_TEMP:-"$tmpspace/runner_temp"}"
     export RUNNER_TEMP
     target="$tmpspace/go_target"
-    version="1.15.4"
-    install_go "$version" "$target"
+    version="1.16.4"
+    inst_tmp="$tmpspace/inst_tmp"
+    mkdir -p "$inst_tmp"
+    install_go "$version" "$target" "$inst_tmp"
     got_version="$("$target/bin/go" version)"
-    assertEquals "go version go1.15.4 $(go_system)" "$got_version"
+    assertEquals "go version go1.16.4 $(go_system)" "$got_version"
   )
 }
 

src/run

@@ -27,6 +27,10 @@ VERSIONS_URL="${VERSIONS_URL:-https://raw.githubusercontent.com/WillAbides/gorel
 
 debug_out starting run
 
+tmp_dir="$(tmpdir_name runtmp)"
+trap 'rm -rf -- "$tmp_dir"' EXIT
+mkdir -p -- "$tmp_dir"
+
 export INSTALL_GO_TIP
 
 # shellcheck disable=2153 # false positive about GO_VERSION being a misspelling of go_version
@@ -47,6 +51,8 @@ if [ "$constraint" = "tip" ] || [ "$constraint" = "gotip" ]; then
   INSTALL_GO_TIP=1
 fi
 
+constraint="$(resolve_constraint_alias "$constraint" "$VERSIONS_URL" "$tmp_dir")"
+
 if [ -z "$constraint" ]; then
   constraint=">=$(select_go_version_from_file "$GITHUB_WORKSPACE/$GO_VERSION_FILE")"
 fi
@@ -75,7 +81,7 @@ if [ -z "$lv" ]; then
 fi
 
 if [ -z "$lv" ]; then
-  known_versions="$(curl --retry 4 -s --fail "$VERSIONS_URL")"
+  known_versions="$(get_known_versions "$VERSIONS_URL" "$tmp_dir")"
   lv="$(select_remote_version "$constraint" "$known_versions")"
   target_dir="$install_parent/${lv#go}/x64"
 fi

src/run_test_long.sh

@@ -35,9 +35,9 @@ do_test_run() {
   assertContains "$(grep '^GOROOT=' "$GITHUB_OUTPUT")" "$WANT_GOROOT"
 }
 
-test_run_1_15_x() {
-  GO_VERSION="1.15.x" \
-    WANT_VERSION="1.15.15" \
+test_run_1_16_x() {
+  GO_VERSION="1.16.x" \
+    WANT_VERSION="1.16.15" \
     do_test_run
 }