Simple script to 'git blame' on new Coverity issues

- Pass an email in to stdin and the script produces output similar
to:

Hi,

Please find the latest report on new defect(s) introduced to fd.io VPP
found with Coverity Scan.

New defect(s) Reported-by: Coverity Scan
Showing 2 of 2 defect(s)

** CID 167726:  Resource leaks  (RESOURCE_LEAK)
/src/vnet/devices/af_packet/device.c: 215 in
af_packet_interface_admin_up_down()

________________________________________________________________________________________________________
*** CID 167726:  Resource leaks  (RESOURCE_LEAK)
/src/vnet/devices/af_packet/device.c: 215 in
af_packet_interface_admin_up_down()
>>>     CID 167726:  Resource leaks  (RESOURCE_LEAK)
>>>     Handle variable "fd" going out of scope leaks the handle.
00a9dcad vnet/vnet/devices/af_packet/device.c (Damjan Marion 2016-08-17
209)   af_packet_if_t *apif =
00a9dcad vnet/vnet/devices/af_packet/device.c (Damjan Marion 2016-08-17
210)     pool_elt_at_index (apm->interfaces, hw->dev_instance);
83cc4e14 vnet/vnet/devices/af_packet/device.c (Alpesh Patel  2016-04-05
211)   u32 hw_flags;
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
212)   int rv, fd = socket (AF_UNIX, SOCK_DGRAM, 0);
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
213)   struct ifreq ifr;
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
214)
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
215)   /* if interface is a bridge ignore */
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
216)   if (apif->host_if_index < 0)
2038ad01 src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-05-18
217)     goto error;			/* no error */
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
218)
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
219)   /* use host_if_index in case host name has changed */
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
220)   ifr.ifr_ifindex = apif->host_if_index;
** CID 167725:  Error handling issues  (NEGATIVE_RETURNS)
/src/vnet/devices/af_packet/device.c: 252 in
af_packet_interface_admin_up_down()

________________________________________________________________________________________________________
*** CID 167725:  Error handling issues  (NEGATIVE_RETURNS)
/src/vnet/devices/af_packet/device.c: 252 in
af_packet_interface_admin_up_down()
>>>     CID 167725:  Error handling issues  (NEGATIVE_RETURNS)
>>>     "fd" is passed to a parameter that cannot be negative.
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
246)     }
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
247)
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
248)   if ((rv = ioctl (fd, SIOCSIFFLAGS, &ifr)) < 0)
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
249)     {
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
250)       clib_unix_warning ("af_packet_%s error: %d",
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
251) 			 apif->is_admin_up ? "up" : "down", rv);
2038ad01 src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-05-18
252)       goto error;
c855b73f src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-04-21
253)     }
83cc4e14 vnet/vnet/devices/af_packet/device.c (Alpesh Patel  2016-04-05
254)
00a9dcad vnet/vnet/devices/af_packet/device.c (Damjan Marion 2016-08-17
255)   vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
83cc4e14 vnet/vnet/devices/af_packet/device.c (Alpesh Patel  2016-04-05
256)
2038ad01 src/vnet/devices/af_packet/device.c  (Ray Kinsella  2017-05-18
257) error:

Change-Id: I9756c16ea24e7520704155ae1f6c5f132087e3bc
Signed-off-by: Chris Luke <chrisy@flirble.org>

diff --git a/build-root/scripts/coverity-blame.sh b/build-root/scripts/coverity-blame.sh
new file mode 100755 (executable)
index 0000000..8775ea4
--- /dev/null
+++ b/build-root/scripts/coverity-blame.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+
+# Read coverity email on stdin
+# whenever we find a filename & line number reference, go git-blame it
+
+file=
+start=
+end=
+
+while read line; do
+       if echo "$line" | grep -q '^/.*: '; then
+               echo "$line"
+               file=$(echo "$line" | cut -d: -f1)
+       elif echo "$line" | grep -q '^[*]'; then
+               echo "$line"
+               file=
+               start=
+               end=
+       elif echo "$line" | grep -q '^[0-9][0-9]*'; then
+               num=$(echo "$line" | awk '{print $1}')
+               [ -z "$start" ] && start=$num
+               #git blame -L "$num,+1" ".$file" | cat
+       elif [ -z "$line" ]; then
+               if [ "$start" -a "$num" -a "$file" ]; then
+                       end=$num
+                       git blame --date=short -L "$start,$end" ".$file" | cat
+                       start=
+                       end=
+                       num=
+               else
+                       echo "$line"
+               fi
+       else
+               echo "$line"
+       fi
+done