Merge pull request #919 from yyuu/system-in-bin

Add a workaround system executable in `/bin`

libexec/rbenv-prefix

@@ -24,7 +24,8 @@ fi
 if [ "$RBENV_VERSION" = "system" ]; then
   if RUBY_PATH="$(rbenv-which ruby 2>/dev/null)"; then
     RUBY_PATH="${RUBY_PATH%/*}"
-    echo "${RUBY_PATH%/bin}"
+    RBENV_PREFIX_PATH="${RUBY_PATH%/bin}"
+    echo "${RBENV_PREFIX_PATH:-/}"
     exit
   else
     echo "rbenv: system version not found in PATH" >&2

test/prefix.bats

@@ -24,6 +24,18 @@ load test_helper
   assert_success "$RBENV_TEST_DIR"
 }
 
+@test "prefix for system in /" {
+  mkdir -p "${BATS_TEST_DIRNAME}/libexec"
+  cat >"${BATS_TEST_DIRNAME}/libexec/rbenv-which" <<OUT
+#!/bin/sh
+echo /bin/ruby
+OUT
+  chmod +x "${BATS_TEST_DIRNAME}/libexec/rbenv-which"
+  RBENV_VERSION="system" run rbenv-prefix
+  assert_success "/"
+  rm -f "${BATS_TEST_DIRNAME}/libexec/rbenv-which"
+}
+
 @test "prefix for invalid system" {
   PATH="$(path_without ruby)" run rbenv-prefix system
   assert_failure "rbenv: system version not found in PATH"