build.sh: Move repository fetching into a separate step

In order to run build.sh, the user has to provide a configuration. As
preparation for creating a generic container image, move the
instructions to fetch git repositories into a script that can run
without a user-specific configuration.

Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>

build.sh

@@ -45,8 +45,6 @@ patches=0
 # For parallel builds use a fourth of the total number of CPUs
 p_cpus=$(($CPUS/4))
 
-smatch_git=git://repo.or.cz/smatch.git
-
 while [ ! -z "$1" ]; do
 	case "$1" in
 	-daily)
@@ -205,17 +203,15 @@ if [ "$1" == "ccache-clean" ]; then
 fi
 
 if [ "$1" == "setup" ]; then
-	rm -rf $log_data/* $build_data/*
+	if [ ! -d $build_data/media-git ]; then
+		echo '`media-git` folder missing, run prepare_build.sh first'
+		exit 1
+	fi
 	mkdir -p $build_data/trees
 	cd $build_data/trees
 	mkdir -p $architectures
-	cd $build_data
-	git clone git://linuxtv.org/v4l-utils.git
-	git clone git://linuxtv.org/edid-decode.git
-	git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git media-git
+
 	cd $build_data/media-git
-	git remote add media_tree git://linuxtv.org/media_tree.git
-	git remote add media_stage git://linuxtv.org/media_stage.git
 	git remote add main $myrepo
 	if [ -n "$mylocalrepo" ]; then
 		git remote add local $mylocalrepo
@@ -362,7 +358,8 @@ cd $top
 
 if [ $sparse == 1 -o $smatch == 1 -o ! -d $build_data/smatch ]; then
 	if [ ! -d $build_data/smatch ]; then
-		git clone $smatch_git
+		echo 'Smatch missing, run prepare_build.sh first'
+		exit 1
 	fi
 	cd $build_data/smatch
 	git remote update
@@ -394,7 +391,6 @@ if [ $use_ccache = "1" ]; then
 	echo -n "ccache version:		" >>$logdir/hashes
 	/usr/bin/ccache --version | head -1 >>$logdir/hashes
 fi
-echo    "smatch/sparse repo:     $smatch_git" >>$logdir/hashes
 echo -n "smatch version:		" >>$logdir/hashes
 $build_data/smatch/smatch --version >>$logdir/hashes
 echo -n "sparse version:		" >>$logdir/hashes

prepare_build.sh

+#!/bin/bash
+
+cd build-data
+git clone git://linuxtv.org/v4l-utils.git
+git clone git://linuxtv.org/edid-decode.git
+git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git media-git
+if [ ! -d smatch ]; then
+  git clone git://repo.or.cz/smatch.git
+fi
+cd build-data/media-git
+git remote add media_tree git://linuxtv.org/media_tree.git
+git remote add media_stage git://linuxtv.org/media_stage.git
+cd ../..