Merge from bittboy/buildroot@db180c0

support/download/cvs

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+
+# We want to catch any unexpected failure, and exit immediately
+set -e
+
+# Download helper for cvs, to be called from the download wrapper script
+#
+# Options:
+#   -q          Be quiet
+#   -o FILE     Generate archive in FILE.
+#   -u URI      Checkout from repository at URI.
+#   -c REV      Use revision REV.
+#   -N RAWNAME  Use rawname (aka module name) RAWNAME.
+#   -n NAME     Use basename NAME.
+#
+# Environment:
+#   CVS      : the cvs 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)  rev="${OPTARG}";;
+    N)  rawname="${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).
+# If the CVS server is deadlocked, the client will never return (cfr.
+# http://autobuild.buildroot.net/results/23d/23d1034b33d0354de15de2ec4a8ccd0603e8db78/build-end.log
+# ). Since nobody sane will put large code bases in CVS, a timeout of
+# 10 minutes should do the trick.
+_cvs() {
+    eval timeout 10m ${CVS} "${@}"
+}
+
+if [[ ${rev} =~ ^[0-9] ]]; then
+    # Date, because a tag or a branch cannot begin with a number
+    select="-D"
+else
+    # Tag or branch
+    select="-r"
+fi
+
+# The absence of an initial : on ${uri} means access method undefined
+if [[ ! "${uri}" =~ ^: ]]; then
+   # defaults to anonymous pserver
+   uri=":pserver:anonymous@${uri}"
+fi
+
+export TZ=UTC
+_cvs ${verbose} -z3 -d"'${uri}'" \
+     co "${@}" -d "'${basename}'" ${select} "'${rev}'" -P "'${rawname}'"
+
+tar czf "${output}" "${basename}"