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kdumpctl: distinguish the failed reason of ssh 

On a host with ipaddr not ready before kdump service, ssh return errno 255.
While if no ssh-key, ssh also return errno 255. For both of cases, the
current kdump code promote user to run 'kdumpctl propagate'. This confuses
user who already installs ssh-key.

In order to tell these two cases from each other, the ssh warning message
should be involved, and parsed.

For the no ssh-key case , warning message is "Permission denied" or "No
such file or directory". For the other, warning message is "Network
Unreachable"

This patch also does a slight change to enlarge the timeout from 60s to
180s. This value can meet test at the time being

Signed-off-by: Pingfan Liu <piliu@redhat.com>
Acked-by: Kairui Song <kasong@redhat.com>
This commit is contained in:
Pingfan Liu 2019-08-28 15:22:22 +08:00 committed by Kairui Song
parent 3e8526cf04
commit 680c0d3414
1 changed files with 19 additions and 6 deletions
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25
kdumpctl
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@ -738,24 +738,38 @@ check_and_wait_network_ready()
local start_time=$(date +%s)
local cur
local diff
local retval
local errmsg
while true; do
ssh -q -i $SSH_KEY_LOCATION -o BatchMode=yes $DUMP_TARGET mkdir -p $SAVE_PATH
errmsg=$(ssh -i $SSH_KEY_LOCATION -o BatchMode=yes $DUMP_TARGET mkdir -p $SAVE_PATH 2>&1)
retval=$?
# ssh exits with the exit status of the remote command or with 255 if an error occurred
if [ $? -eq 0 ]; then
if [ $retval -eq 0 ]; then
return 0
elif [ $? -ne 255 ]; then
elif [ $retval -ne 255 ]; then
echo "Could not create $DUMP_TARGET:$SAVE_PATH, you should check the privilege on server side" >&2
return 1
fi
# if server removes the authorized_keys or, no /root/.ssh/kdump_id_rsa
echo $errmsg | grep -q "Permission denied\|No such file or directory"
if [ $? -eq 0 ]; then
echo "Could not create $DUMP_TARGET:$SAVE_PATH, you probably need to run \"kdumpctl propagate\"" >&2
return 1
fi
cur=$(date +%s)
diff=$( $cur - $start_time )
let "diff = $cur - $start_time"
# 60s time out
if [ $diff -gt 60 ]; then
if [ $diff -gt 180 ]; then
break;
fi
sleep 1
done
echo "Could not create $DUMP_TARGET:$SAVE_PATH, ipaddr is not ready yet. You should check network connection" >&2
return 1
}
@ -763,7 +777,6 @@ check_ssh_target()
{
check_and_wait_network_ready
if [ $? -ne 0 ]; then
echo "Could not create $DUMP_TARGET:$SAVE_PATH, you probably need to run \"kdumpctl propagate\"" >&2
return 1
fi
return 0