Add rawhide upstream sync script

Usage:

1. Invoke the script as follows:

       ./sync-upstream.sh upstream-repo

   where upstream-repo is the path to the synced upstream git repo.

2. Watch the script run.  If it proceeds to building the package, then
   everything seems good and you just need to test the build after it
   is complete.  If it exits before the build (you'll know if you read
   the output of the script) then manual intervention is required to
   complete the sync.  This will typically happen when a patch fails
   to apply on the new sources.

sync-upstream.sh

@@ -0,0 +1,82 @@
+#!/bin/sh
+# Given a git source repo, generate a tarball from the desired branch, modify
+# the spec file and upload it to lookaside cache if the tarball unpacks and
+# gets patched cleanly.
+
+set -e
+
+# We want to sync from master by default.  Change this if you want to sync from
+# another branch.
+branch=master
+
+# We can't do anything without an upstream repo
+if [ $# -ne 1 ]; then
+	echo "Usage: $0 <path-to-upstream-repo>" 1>&2
+	exit 1
+fi
+
+upstream=$1
+
+srcdir=$(git --git-dir=$upstream/.git describe $branch)
+cursrc=$(sed -ne 's/^%define glibcsrcdir  \(.*\)/\1/p' glibc.spec)
+
+# Upstream has not moved forward since the last sync.
+# TODO: Some time in the future, we might want to only sync when upstream has
+# advanced more than a certain number of commits, say, 42.
+if [ "$cursrc" = "$srcdir" ]; then
+	echo "+ Already in sync with upstream."
+	exit 0
+fi
+
+# Generate and gzip the tarball from the desired branch of the repository.
+echo "+ Generating tarball."
+git --git-dir="$upstream/.git" archive --prefix="$srcdir/" "$branch" \
+	> "$srcdir.tar"
+gzip -9 "$srcdir.tar"
+echo "+ Created $srcdir.tar.gz"
+
+# Our changelog header
+cldate=$(date +'%a %b %d %Y')
+clname=$(git config --get user.name)
+clemail=$(git config --get user.email | sed 's/@/\\@/')
+
+# Getting our version and release number from the spec file.
+nv=$(perl -ne 's/^%define glibcversion (.+)/printf("%s-", $1)/e;' \
+	  -e 's/^%define glibcrelease ([0-9]+).*/printf("%d\n", $1 + 1)/e;' \
+	  glibc.spec)
+
+# Our changelog entry.
+changelog="* $cldate $clname <$clemail> - $nv\n- Sync with upstream $branch\n"
+
+# Change the glibcsrcdir variable, bump up the release number and add an extra
+# entry to the changelog.
+echo "+ Updating spec file."
+perl -pi \
+	-e "s/^(%define glibcsrcdir  ).+/\$1$srcdir/;
+	    s/^(%define glibcrelease )(\d+)/print(\$1); print(\$2 + 1);'';/e;
+	    s/^(%changelog)$/\$1\n$changelog/" \
+	glibc.spec
+
+function prep_failed {
+	# fedpkg prep failed.
+	if [ $? -ne 0 ]; then
+		echo "+ Source prep failed."
+		echo "+ Check the output in $tmpfile and fix things before committing."
+		false
+	fi
+}
+
+echo "+ Testing if fedpkg prep works."
+tmpfile=$(mktemp fedpkg-prep.out-XXXX)
+
+trap prep_failed EXIT
+fedpkg prep > "$tmpfile" 2>&1
+# Remove mess created by fedpkg prep
+rm -f "$tmpfile"
+rm -rf "$srcdir"
+echo "+ Source prep is clean, so we're good to go."
+fedpkg new-sources "$srcdir.tar.gz"
+git commit -a -m \"Sync with upstream $branch\"
+fedpkg push
+fedpkg build
+echo "+ Done!"