Better error and progress messages

TODO

 Binary packages
 ---------------
 
-* Better error messages
-* Show 'Downloading' and 'Installing' messages a la ruby-build
+X Better error messages
+X Show 'Downloading' and 'Installing' messages a la ruby-build
 * Rewrite RbConfig::CONFIG['CC'] on install
 * Patch rbx since the rewriter doesn't work there
 * rbenv-install should check for binary packages before building

libexec/ruby-package-fetch

@@ -64,6 +64,7 @@ if [ -n "$check" ]; then
   } >&2
 else
   package_filename="${TMPDIR}/${package_name}.$$"
+  echo "Downloading $package_url..." >&2
   download "$package_url" "$package_filename" || {
     echo "error: couldn't fetch package \`$package' ($package_url)"
     exit 1

libexec/ruby-package-install

@@ -37,5 +37,8 @@ fi
 trap cleanup_packages SIGINT SIGTERM EXIT
 
 package_root="$(ruby-package unpack "$package_file")"
+package_name="$(cat "${package_root}/metadata/package")"
 
+echo "Installing ${package_name}..." >&2
 "${package_root}/bin/ruby-package-install" "$destination"
+echo "Installed ${package_name} to ${destination}" >&2