ART: suppress control characters in scripts without a tty

Makes LUCI output slightly more readable.

Test: manual
Change-Id: I00d51fe3815ded5e1478081e1b170c1eea200e6e

4 files changed, 25 insertions, 13 deletions

diff --git a/tools/buildbot-sync.sh b/tools/buildbot-sync.sh
index fb5927260b..e274fd4fd8 100755
--- a/tools/buildbot-sync.sh
+++ b/tools/buildbot-sync.sh
@@ -16,11 +16,14 @@
 
 # Push ART artifacts and its dependencies to a chroot directory for on-device testing.
 
-red='\033[0;31m'
-green='\033[0;32m'
-yellow='\033[0;33m'
-magenta='\033[0;35m'
-nc='\033[0m'
+if [ -t 1 ]; then
+  # Color sequences if terminal is a tty.
+  red='\033[0;31m'
+  green='\033[0;32m'
+  yellow='\033[0;33m'
+  magenta='\033[0;35m'
+  nc='\033[0m'
+fi
 
 adb wait-for-device
 
diff --git a/tools/cleanup-buildbot-device.sh b/tools/cleanup-buildbot-device.sh
index 694c739e07..ebd61639bd 100755
--- a/tools/cleanup-buildbot-device.sh
+++ b/tools/cleanup-buildbot-device.sh
@@ -14,8 +14,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-green='\033[0;32m'
-nc='\033[0m'
+if [ -t 1 ]; then
+  # Color sequences if terminal is a tty.
+  green='\033[0;32m'
+  nc='\033[0m'
+fi
 
 # Setup as root, as device cleanup requires it.
 adb root
diff --git a/tools/setup-buildbot-device.sh b/tools/setup-buildbot-device.sh
index ee623e8b7f..c2451d3d5b 100755
--- a/tools/setup-buildbot-device.sh
+++ b/tools/setup-buildbot-device.sh
@@ -17,10 +17,13 @@
 # The work does by this script is (mostly) undone by tools/teardown-buildbot-device.sh.
 # Make sure to keep these files in sync.
 
-red='\033[0;31m'
-green='\033[0;32m'
-yellow='\033[0;33m'
-nc='\033[0m'
+if [ -t 1 ]; then
+  # Color sequences if terminal is a tty.
+  red='\033[0;31m'
+  green='\033[0;32m'
+  yellow='\033[0;33m'
+  nc='\033[0m'
+fi
 
 if [ "$1" = --verbose ]; then
   verbose=true
diff --git a/tools/teardown-buildbot-device.sh b/tools/teardown-buildbot-device.sh
index 6324e13118..1ea4cf0da4 100755
--- a/tools/teardown-buildbot-device.sh
+++ b/tools/teardown-buildbot-device.sh
@@ -17,8 +17,11 @@
 # This script undoes (most of) the work done by tools/setup-buildbot-device.sh.
 # Make sure to keep these files in sync.
 
-green='\033[0;32m'
-nc='\033[0m'
+if [ -t 1 ]; then
+  # Color sequences if terminal is a tty.
+  green='\033[0;32m'
+  nc='\033[0m'
+fi
 
 # Setup as root, as some actions performed here require it.
 adb root