Improve install script rate limit handling

install.sh

@@ -9,11 +9,19 @@ set -o pipefail
 REPO="walles/px"
 PXPREFIX=${PXPREFIX:-/usr/local/bin}
 
-# This is the download URL for the latest release
-URL=$(curl -s https://api.github.com/repos/$REPO/releases \
-  | grep browser_download_url \
+# Get the download URL for the latest release
+TEMPFILE=$(mktemp || mktemp -t px-install-releasesjson.XXXXXXXX)
+curl -s https://api.github.com/repos/$REPO/releases > "${TEMPFILE}"
+if grep "API rate limit exceeded" "${TEMPFILE}" > /dev/null ; then
+  cat "${TEMPFILE}" >&2
+  exit 1
+fi
+
+URL=$(
+  grep browser_download_url "$TEMPFILE" \
   | cut -d '"' -f 4 \
   | head -n 1)
+rm "${TEMPFILE}"
 
 echo "Downloading the latest release..."
 echo "  $URL"

tests/installtest.sh

@@ -21,8 +21,12 @@ chmod a+x "${CURL}"
 # ... and put both first in the PATH
 export PATH=${WORKDIR}:$PATH
 
-# Verify happy path install
-PXPREFIX=${WORKDIR} bash -x ./install.sh
+cat << EOF
+#
+#  Testing happy-path install...
+#
+EOF
+PXPREFIX=${WORKDIR} bash ./install.sh
 test -x "${WORKDIR}/px"
 test -x "${WORKDIR}/ptop"
 
@@ -37,6 +41,11 @@ chmod a+x "${CURL}"
 rm "${WORKDIR}/px"
 rm "${WORKDIR}/ptop"
 
+cat << EOF
+#
+#  Testing rate-limited by Github install...
+#
+EOF
 # Installation should fail with an error code, that's why we're "!"ing it
 ! PXPREFIX=${WORKDIR} bash ./install.sh 2> "${WORKDIR}/message.txt"
 # The installer should just have printed the error message on stderr