Merge from bittboy/buildroot@db180c0

support/download/hg

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+
+# We want to catch any unexpected failure, and exit immediately
+set -e
+
+# Download helper for hg, to be called from the download wrapper script
+#
+# Options:
+#   -q          Be quiet.
+#   -o FILE     Generate archive in FILE.
+#   -u URI      Clone from repository at URI.
+#   -c CSET     Use changeset (or revision) CSET.
+#   -n NAME     Use basename NAME.
+#
+# Environment:
+#   HG       : the hg command to call
+
+verbose=
+while getopts "${BR_BACKEND_DL_GETOPTS}" OPT; do
+    case "${OPT}" in
+    q)  verbose=-q;;
+    o)  output="${OPTARG}";;
+    u)  uri="${OPTARG}";;
+    c)  cset="${OPTARG}";;
+    n)  basename="${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)
+_hg() {
+    eval ${HG} "${@}"
+}
+
+_hg clone ${verbose} "${@}" --noupdate "'${uri}'" "'${basename}'"
+
+_hg archive ${verbose} --repository "'${basename}'" --type tgz \
+            --prefix "'${basename}'" --rev "'${cset}'" \
+            - >"${output}"