add `genrpm.sh' to build rpm easily

rpm/genrpm.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+set -e
+
+show_help()
+{
+    echo -e "`basename $0`  [option] [argument]"
+    echo
+    echo -e "Options:"
+    echo -e "  -h    show this help."
+    echo -e "  -v    with argument version(2.1.4 by default)."
+    echo -e "  -f    with argument format(tar.xz by default) used by git archive."
+    echo
+    echo -e "Examples:"
+    echo -e "  to build base on version \`2.1.4' with format \`tar.xz', run:"
+    echo -e "    `basename $0` -f tar.xz -v 2.1.4"
+}
+
+while getopts "hv:f:" opt
+do
+    case ${opt} in
+        h)
+            show_help
+            exit 0
+            ;;
+        v)
+            if [ "${OPTARG}" = v* ]; then
+                version=${OPTARG#"v"}
+            else
+                version=${OPTARG}
+            fi
+            ;;
+        f)
+            format=${OPTARG}
+            ;;
+        *)
+            exit 1
+            ;;
+    esac
+done
+
+get_att_val()
+{
+    att=$1
+    val=$2
+
+    if [ -z $(eval echo \$$att) ]; then
+        eval $att=$val
+    fi
+}
+
+get_att_val version "2.1.4"
+get_att_val format "tar.xz"
+
+name="shadowsocks-libev"
+spec_name="shadowsocks-libev.spec"
+
+pushd `git rev-parse --show-toplevel`
+git archive v${version} --format=${format} --prefix=${name}-${version}/ -o rpm/SOURCES/${name}-${version}.${format}
+pushd rpm
+
+sed -i -e "s/^\(Version:        \).*$/\1${version}/" \
+       -e "s/^\(Source0:        %{name}-%{version}\.\).*$/\1${format}/" \
+    SPECS/${spec_name}
+
+rpmbuild -bb SPECS/${spec_name} --define "%_topdir `pwd`"