SCRIPTS: mk-patch-list: produce a list of patches

There does not seem to be a convenient way to tell git-show-backports to
produce individual patches with numbers. That's what this script does by
calling git-format-patch for each specified commit ID, letting git do all
the painful work (formatting etc). This has been mostly used during
backport sessions but was apparently never committed!

scripts/mk-patch-list.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+die() {
+	[ "$#" -eq 0 ] || echo "$*" >&2
+	exit 1
+}
+
+err() {
+	echo "$*" >&2
+}
+
+quit() {
+	[ "$#" -eq 0 ] || echo "$*"
+	exit 0
+}
+
+#### Main
+
+USAGE="Usage: ${0##*/} [-o <output_dir>] [-s <start_num>] [-b <base>] commit_id..."
+OUTPUT=
+BASE=
+NUM=
+
+while [ -n "$1" -a -z "${1##-*}" ]; do
+	case "$1" in
+		-b)        BASE="$2"      ; shift 2 ;;
+		-o)        OUTPUT="$2"    ; shift 2 ;;
+		-s)        NUM="$2"       ; shift 2 ;;
+		-h|--help) quit "$USAGE" ;;
+		*)         die  "$USAGE" ;;
+	esac
+done
+
+PATCHES=( "$@" )
+NUM=${NUM:-1}
+
+for p in ${PATCHES[@]}; do
+        if [ -n "$BASE" ]; then
+                # find the patch number from the base.
+                # E.g. v2.9-dev0-774-gd710dfbac
+                NUM=$(git describe --match "$BASE" "$p")
+                NUM=${NUM#"$BASE"-}
+                NUM=${NUM%-*}
+        fi
+        git format-patch -k -1 --start-number=$NUM ${OUTPUT:+-o $OUTPUT} "$p"
+        ((NUM++))
+done