From e49d3de11d550381c754eb2a55db8f994dbe478d Mon Sep 17 00:00:00 2001
From: Silvio Rhatto <rhatto@riseup.net>
Date: Thu, 17 Sep 2020 19:21:32 -0300
Subject: Feat: adds usb_detach command

---
 kvmx | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 54 insertions(+), 14 deletions(-)

diff --git a/kvmx b/kvmx
index 50ba01b..4f47403 100755
--- a/kvmx
+++ b/kvmx
@@ -2313,19 +2313,8 @@ function kvmx_disposable {
   done
 }
 
-# USB attach
-function kvmx_usb_attach {
-  if ! kvmx_running; then
-    echo "$BASENAME: guest $VM is not running"
-    exit 1
-  fi
-
-  # Check for lsusb
-  if ! which lsusb &> /dev/null; then
-    echo "Please install usbutils package."
-    exit 1
-  fi
-
+# Helper function to chose a device
+function __kvmx_usb_devices_check {
   local total="`lsusb | wc -l`"
 
   # Check if USB is available in the system
@@ -2339,12 +2328,20 @@ function kvmx_usb_attach {
     echo "You need to enable USB support into the kvmxfile."
     exit 1
   fi
+}
 
+# Helper function to list available USB devices
+function __kvmx_usb_devices_list {
   # List available devices
   echo "Available devices:"
   echo ""
   lsusb | cat -n
   echo ""
+}
+
+# Helper function to choose an USB device
+function __kvmx_usb_devices_choose {
+  local total="`lsusb | wc -l`"
 
   # Read option
   read -rep "Choose a device (1-$total): " choice
@@ -2355,6 +2352,21 @@ function kvmx_usb_attach {
     exit 1
   fi
 
+  echo $choice
+}
+
+# USB attach
+function kvmx_usb_attach {
+  if ! kvmx_running; then
+    echo "$BASENAME: guest $VM is not running"
+    exit 1
+  fi
+
+  # Get a device
+  __kvmx_usb_devices_check
+  __kvmx_usb_devices_list
+  local choice="`__kvmx_usb_devices_choose`"
+
   # Get bus, device, vendor and product IDs
   local option="`lsusb | cat -n | grep \"^     $choice\"`"
   local bus="`echo $option     | awk '{ print $3 }'`"
@@ -2368,7 +2380,35 @@ function kvmx_usb_attach {
 
   # Attach into the guest
   echo "Attaching device ${vendor}:${product} into the guest..."
-  kvmx_monitor device_add usb-host,vendorid=0x${vendor},productid=0x${product}
+  kvmx_monitor device_add usb-host,vendorid=0x${vendor},productid=0x${product},id=usb-0x${vendor}-0x${product}
+}
+
+# USB detach
+function kvmx_usb_detach {
+  if ! kvmx_running; then
+    echo "$BASENAME: guest $VM is not running"
+    exit 1
+  fi
+
+  # Get a device
+  __kvmx_usb_devices_check
+  __kvmx_usb_devices_list
+  local choice="`__kvmx_usb_devices_choose`"
+
+  # Get bus, device, vendor and product IDs
+  local option="`lsusb | cat -n | grep \"^     $choice\"`"
+  local bus="`echo $option     | awk '{ print $3 }'`"
+  local device="`echo $option  | awk '{ print $5 }' | cut -d ':' -f 1`"
+  local vendor="`echo $option  | awk '{ print $7 }' | cut -d ':' -f 1`"
+  local product="`echo $option | awk '{ print $7 }' | cut -d ':' -f 2`"
+
+  # Detach into the guest
+  echo "Detaching device ${vendor}:${product} into the guest..."
+  kvmx_monitor device_del usb-0x${vendor}-0x${product}
+
+  # Restore permission to the device
+  echo "Restoring ownership of /dev/bus/usb/${bus}/${device}..."
+  sudo chown root /dev/bus/usb/$bus/$device
 }
 
 # Dispatch
-- 
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