I wrote a script to transfer a folder from VPS to Synology NAS Server. The script fails at 1 or 2% transfer without any indication why. When I run the command manually it works fine without any issues and it transfer the folder flawlessly. I’m not sure what is causing this and would appreciate if i can get some guidance on where to look.
SCRIPT:
#!/usr/bin/expect set dir [timestamp -format "%Y-%m-%d"] spawn sftp user@host.mybackup.me expect "Password:" send "passw0rdn" expect "sftp>" send "cd /directory/n" expect "sftp>" send "put -r /home/backup/$dirn" expect "sftp>" send "byen"
RESULT:
root@host [/scripts]# ./sftp.sh spawn sftp user@host.synology.me user@host.mybackup.me's password: Connected to host.mybackup.me sftp> cd /directory/for/backup sftp> put -r /home/backup/2017-12-26 Uploading /home/backup/2017-12-26/ to /backup/2017-12-26 Entering /home/backup/2017-12-26/ Entering /home/backup/2017-12-26/accounts /home/backup/2017-12-26/file1.tar.gz 2% 26MB 1.8MB/s 08:41 ETAroot@host [/scripts]# root@host [/scripts]#
MANUAL COMMAND:
root@host [/scripts]# sftp user@host.synology.me backup@host.mybackup.me's password: Connected to host.mybackup.me. sftp> cd directory sftp> put -r /home/backup/2017-12-26 Uploading /home/backup/2017-12-26/ to /backups/2017-12-26 Entering /home/backup/2017-12-26/ Entering /home/backup/2017-12-26/accounts /home/backup/2017-12-26/file.tar.gz 100% 959MB 820.2KB/s 19:57 /home/backup/2017-12-26/file2.tar.gz 100% 147MB 1.4MB/s 01:45 sftp> bye root@host [/Scripts]#
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Answer
I guess, in your case, timeout happened with respect to Expect, since the file transfer takes some extra time than the default timeout (10seconds). You can either set the timeout to -1 or you can increase it to some higher value and the they are in the units of seconds.
set timeout -1; # Infinite amount of waiting time
or
set timeout 300; # 5 minutes of waiting time
You can keep the above statement in your code.
send "put -r /home/backup/$dirn"
expect {
timeout {puts "timeout happened"}
"sftp>"
}
send "byer"
expect eof
Always use r character to send ‘Enter’ key instead of n. The last statement expect eof will wait for the graceful closure of sftp program.