Updates for XEN_LINUX_SOURCE=hg-clone.

By default search for mercurial repositories in $(LINUX_SRC_PATH)
followed by a location derived from the current Xen repository's
default parent. e.g. A clone of
http://xenbits.xensource.com/xen-unstable.hg will derive
http://xenbits.xensource.com/linux-2.6.18-xen.hg. A specific
repository can be specified by giving XEN_LINUX_HGREPO=<URL or path>
on the make command line.

Add capability to put XEN_LINUX_UPDATE=y on the make command line to
update the Linux repository. Disabled by default since we don't want
to touch a developers repository without permission.

Dropped XEN_LINUX_HGUPDATES since it was unecessary and confusing.

Signed-off-by: Ian Campbell <ian.campbell@xensource.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/buildconfigs/select-repository b/buildconfigs/select-repository
new file mode 100755
index 0000000000..db46049adb
--- /dev/null
+++ b/buildconfigs/select-repository
@@ -0,0 +1,49 @@
+#!/bin/bash
+
+ME=$(basename $0)
+
+if [ $# -lt 1 ] || [ $# -gt 2 ] ; then
+    echo "usage: $ME <repository-name> [search-path]" 1>&2
+    exit 1;
+fi
+
+REPO=$1
+LINUX_SRC_PATH=$2
+
+if [ X"${LINUX_SRC_PATH}" != X ] ; then
+    echo "$ME: Searching \`${LINUX_SRC_PATH}' for $REPO" 1>&2
+    IFS_saved="$IFS"
+    IFS=:
+    for i in $LINUX_SRC_PATH ; do
+	# Ignore current directory since we will almost certainly find
+	# the target directory there which breaks updating (there's no
+	# point updating from yourself!).
+	if [ X"." = X"${i}" ] ; then
+	    echo "$ME: Ignoring \`.'" 1>&2
+	    continue
+	fi
+
+	if [ -d "$i/$REPO/.hg" ] ; then
+	    echo "$ME: Found $i/$REPO" 1>&2
+	    echo "$i/$REPO"
+	    exit 0
+	fi
+    done
+    IFS="$IFS_saved"
+fi
+
+XEN=$(hg -R ${XEN_ROOT} path default)
+if [ $? -ne 0 ] || [ X"$XEN" = "X" ] ; then
+    echo "$ME: Unable to determine Xen repository parent." 1>&2
+    exit 1;
+fi
+
+BASE=$(dirname ${XEN})
+if [ $? -ne 0 ] || [ X"$XEN" = "X" ] ; then
+    echo "$ME: Unable to determine Xen repository parent." 1>&2
+    exit 1;
+fi
+
+echo "$ME: Found ${BASE}/${REPO}" 1>&2
+echo ${BASE}/${REPO}
+exit 0