Use github tarballs

tar.xz is 800kB smaller than tar.gz, but not having to create the tarball
manually is much more convenient.

make-git-snapshot.sh

@@ -1,26 +0,0 @@
-#!/bin/bash
-set -e
-
-NAME=systemd
-UPSTREAM=git@github.com:systemd/systemd.git
-
-[ -n "$1" ] && HEAD="$1" || HEAD="HEAD"
-
-WORKDIR="$(mktemp -d --tmpdir "$NAME.XXXXXXXXXX")"
-trap 'rm -rf $WORKDIR' exit
-
-git clone "$UPSTREAM" "$WORKDIR"
-
-pushd "$WORKDIR" > /dev/null
-git branch to-archive $HEAD
-read COMMIT_SHORTID COMMIT_TITLE <<EOGIT
-$(git log to-archive^..to-archive --pretty='format:%h %s')
-EOGIT
-popd > /dev/null
-
-echo "Making git snapshot using commit: $COMMIT_SHORTID $COMMIT_TITLE"
-
-DIRNAME="$NAME-git$COMMIT_SHORTID"
-git archive --remote="$WORKDIR" --format=tar --prefix="$DIRNAME/" to-archive | xz -9 > "$DIRNAME.tar.xz"
-
-echo "Written $DIRNAME.tar.xz"

systemd.spec

@@ -22,10 +22,9 @@ License:        LGPLv2+ and MIT and GPLv2+
 Summary:        A System and Service Manager
 
 %if %{defined gitcommit}
-# Snapshot tarball can be created using: ./make-git-shapshot.sh [gitcommit]
-Source0:        %{name}-git%{gitcommit}.tar.xz
+Source0:        https://github.com/systemd/systemd/archive/%{?gitcommit}.tar.gz#/%{name}-%{gitcommit}.tar.gz
 %else
-Source0:        %{name}-%{version}.tar.xz
+Source0:        https://github.com/systemd/systemd/archive/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 %endif
 
 # Prevent accidental removal of the systemd package