poky-gen-tapdevs: script to create a 'bank' of tap interfaces

This script can be used to create and configure a 'bank' of tap
interfaces that can be used by the poky-qemu script.

It is useful in locked-down enterprise environments where developers
do not have sudo access, but need to be able to run QEMU with
networking. A sysadmin would then use this script to bring up a
number of tap interfaces for the user to make use of.

This fixes [BUGID #391]

Signed-off-by: Scott Garman <scott.a.garman@intel.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/scripts/poky-qemu-internal b/scripts/poky-qemu-internal
index c3720d9ce2..0ea38eef60 100755
--- a/scripts/poky-qemu-internal
+++ b/scripts/poky-qemu-internal
@@ -50,6 +50,10 @@ if [ -z "$QEMU_MEMORY" ]; then
 
 fi
 
+# This flag file is created when poky-gen-tapdevs creates a bank of
+# tap devices, indicating that the user does not have sudo privs.
+NOSUDO_FLAG="/etc/poky-nosudo"
+
 QEMUIFUP=`which poky-qemu-ifup`
 QEMUIFDOWN=`which poky-qemu-ifdown`
 
@@ -81,6 +85,13 @@ for tap in $POSSIBLE; do
 done
 
 if [ "$TAP" = "" ]; then
+    if [ -e "$NOSUDO_FLAG" ]; then
+        echo "Error: There are no available tap devices to use for networking,"
+        echo "and I see $NOSUDO_FLAG exists, so I am not going to try creating"
+        echo "a new one with sudo."
+        exit 1
+    fi
+
     GROUPID=`id -g`
     echo 'Setting up tap interface under sudo'
     tap=`sudo $QEMUIFUP $GROUPID $POKY_NATIVE_SYSROOT`