Add script which uses `bazel run` to invoke the command in the calling terminal, not the bazel server.

This fixes two user annoyances:
  1) the command can now read from stdin
  2) the bazel lock is not held when the command is invoked

The script use's bazel's `--script_path` flag to write out the shell script that runs the command.

--
MOS_MIGRATED_REVID=112815712

1 files changed, 46 insertions, 0 deletions

diff --git a/scripts/bazel-run.sh b/scripts/bazel-run.sh
new file mode 100755
index 0000000000..d259b42ea4
--- /dev/null
+++ b/scripts/bazel-run.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+#
+# Copyright 2016 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+USAGE='bazel-run.sh [<bazel option>...] <target> [ -- [<target option>]... ]'
+DESCRIPTION='
+  Builds and runs the command generated by "bazel run" in the calling
+  terminal. The command is run as a grandchild of the current shell,
+  not from the Bazel server. Therefore, the program will have a controlling terminal, and
+  the Bazel lock is released before running the command.'
+
+function usage() {
+  echo "$USAGE" "$DESCRIPTION" >&2
+}
+
+function die() {
+  echo "$1"
+  exit 1
+}
+
+function cleanup() {
+  rm "$runcmd"
+}
+
+[ $# -gt 0 ] || { usage; exit 1; }
+
+runcmd="$(mktemp /tmp/bazel-run.XXXXXX)" || die "Could not create tmp file"
+trap "cleanup" EXIT
+
+bazel run --script_path="$runcmd" "$@" || exit $?
+[ -x "$runcmd" ] || die "File $runcmd not executable"
+
+"$runcmd"
+