alpine-conf: modify setup-interfaces to create simple bridges

Modified setup-interfaces to create simple bridges (works only with
one interface per bridge). Useful when setting up a Xen system, since
interfaces need to be bridged in order for guests to have networking.
Some distributions automatically create one bridge for each interface
when Xen is installed, but I think this is too aggressive.

Changes since v1:

 * Only ask to bridge interfaces if Xen Dom0 is detected

1 files changed, 9 insertions, 0 deletions

diff --git a/libalpine.sh.in b/libalpine.sh.in
index 36d2a93..8661643 100755
--- a/libalpine.sh.in
+++ b/libalpine.sh.in
@@ -106,4 +106,13 @@ askpassword() {
 	IFS=$_oifs
 }
 
+# Detect if we are running Xen
+is_xen() {
+	test -d /proc/xen
+}
 
+# Detect if we are running Xen Dom0
+is_xen_dom0() {
+	is_xen && \
+	grep -q "control_d" /proc/xen/capabilities
+}