Merge from bittboy/buildroot@db180c0

support/download/scp

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+# We want to catch any unexpected failure, and exit immediately
+set -e
+
+# Download helper for scp, to be called from the download wrapper script
+#
+# Options:
+#   -q          Be quiet.
+#   -o FILE     Copy to local file FILE.
+#   -f FILE     Copy from remote file FILE.
+#   -u URI      Download file at URI.
+#
+# Environment:
+#   SCP       : the scp command to call
+
+verbose=
+while getopts "${BR_BACKEND_DL_GETOPTS}" OPT; do
+    case "${OPT}" in
+    q)  verbose=-q;;
+    o)  output="${OPTARG}";;
+    f)  filename="${OPTARG}";;
+    u)  uri="${OPTARG}";;
+    :)  printf "option '%s' expects a mandatory argument\n" "${OPTARG}"; exit 1;;
+    \?) printf "unknown option '%s'\n" "${OPTARG}" >&2; exit 1;;
+    esac
+done
+
+shift $((OPTIND-1)) # Get rid of our options
+
+# Caller needs to single-quote its arguments to prevent them from
+# being expanded a second time (in case there are spaces in them)
+_scp() {
+    eval ${SCP} "${@}"
+}
+
+# Remove any scheme prefix
+uri="${uri##scp://}"
+
+_scp ${verbose} "${@}" "'${uri}/${filename}'" "'${output}'"