Add more debug info to travis rpi cfg

.travis.yml

@@ -6,7 +6,7 @@ matrix:
   - os: linux
     dist: trusty
     sudo: required
-    env: TARGET="rpi" SCRIPT="pisetup.sh" IMAGE="opm-${TRAVIS_TAG}.img" RPI_ZIP="raspbian_lite-2017-07-05-of_v0.9.8.img.zip" RPI_URL="https://github.com/kr15h/openframeworks-rpi-image/releases/download/v1.0.0/${RPI_ZIP}"
+    env: TARGET="rpi" SCRIPT="pisetup.sh" IMAGE="opm${TRAVIS_TAG}.img" RPI_ZIP="raspbian_lite-2017-07-05-of_v0.9.8.img.zip" RPI_URL="https://github.com/kr15h/openframeworks-rpi-image/releases/download/v1.0.0/${RPI_ZIP}"
     addons:
       apt:
         packages:

scripts/ci/rpi/mkimage.sh

@@ -37,6 +37,9 @@ trap cleanup EXIT
 # Download raspbian arm only if we have not already done so
 [ ! -f "${RPI_ZIP}" ] && wget "${RPI_URL}"
 
+# Clean the existing image files
+(ls *.img >> /dev/null 2>&1 && rm *.img) || echo "no .img files to remove"
+
 # Unzip Raspbian
 # -u  update files, create if necessary
 unzip -u "${RPI_ZIP}"
@@ -44,6 +47,7 @@ unzip -u "${RPI_ZIP}"
 mv "$(ls *.img | head -n 1)" "${IMAGE}"
 
 # Configure loopback device to expand partition 2
+losetup -f
 loopdev=$(losetup --find --show "${IMAGE}")
 echo "Created loopback device ${loopdev}"
 echo "Mounting filesystem."