building a standalone rpm from the standalone tarball

This allows the rpm to be built anywhere the necessary build deps are
available (including on debian) and the resulting package will work on as
broad a range of rpm distributions as the libc/kernel supports.

The DistributionUpdate changes to use the new script have not yet been
tested.

standalone/rpm/rpmbuild-from-standalone-tarball

@@ -0,0 +1,38 @@
+#!/bin/sh
+# Create a standalone rpm from a standalone tarball.
+# 
+# This can build a rpm for any architecture you have a standalone tarball
+# for, and does not need to be run on a machine of the same architecture.
+set -e
+rpmarch="$1"
+tarball="$2"
+version="$(echo "$3" | sed 's/-.*//')"
+release=1
+rpmrepo="$4"
+if [ -z "$rpmarch" ] || [ -z "$tarball" ] || [ -z "$version" ] || [ -z "$rpmrepo" ]; then
+	echo "usage: rpmbuild-from-standalone-tarball rpmarch file.tar.gz version rpmrepo"
+fi
+
+basedir="$(dirname "$0")"
+
+tmpdir=$(mktemp -d)
+trap cleanup exit
+cleanup () {
+	rm -rf "$tmpdir"
+}
+
+cat "$tarball" | (cd "$tmpdir" && tar zx)
+buildroot="$tmpdir/rpmbuild"
+mkdir -p "$buildroot"
+
+rpmbuild \
+	--buildroot="$buildroot" \
+	--define="_rpmdir `pwd`" \
+	--define="_rpmfilename git-annex-standalone.rpm" \
+	--define="version $version" \
+	--define="release $release" \
+	--target="$rpmarch" \
+	-bb "$basedir/git-annex-standalone.spec" \
+	--quiet
+package="git-annex-standalone-$version-$release.$rpmarch.rpm"
+mv git-annex-standalone.rpm "$rpmrepo/$package"