mjhjmtu

few months ago i made a script to backup some stuff from a Server Computer into a NAS (Network Attached Storage)

The script was supposed to mount the NAS and move the files into it, until this point everything went fine

however, because i didn't had much time to make a more complex Script, i made 4 different folders to use as backup directory, and made duplicates of the script changing its destiny, then i used crontab to each week backup the data into one of those folders

The reason i did this way is because as i said before, i didnt had time to make a more complex script, so i couldn't spent much time studying how to check if the file was modified or not, then overwrite the modified files, etc... so, that way was much simpler, because i could just erase everything and then paste the new data inside, also wouldn't be a problem, because it would keep the latest backup for more 3 weeks at least until a new one "overwrites" it

So, until the part my script mounts the nas and delete/paste the data, everything is working fine, the problem is when umounting

I dont know what is happening, because if i use the command to umount manually, it works just fine, but inside the script, seems like it isnt umounting, i dont know why

because the script wont umount correctly, into the following week, when the next script in queue try to mount, it cant mount due to the fact the NAS is already mounted

Plus, everything MUST be done automatically, that means i cant mount/umount manually

Here is a sample of the script bellow:

#!/bin/bash

pwd="root_password_here$"

echo $pwd | sudo -S id

sudo mount -t cifs //192.168.1.40/Act_Backup/SERVIDOR/dia17 -o username=USUARIO,password=SENHA,rw,nounix,iocharset=utf8,file_mode=0644,dir_mode=0755 /var/local/mountpoint

sudo rm -Rf /var/local/mountpoint/Act
Etc...

sudo cp -R /var/samba/Act /var/local/mountpoint
Etc...

sudo umount /var/local/mountpoint

I took out a lot of lines of the script just to show an example of how it works

Plus, i know its "wrong" to use: "echo $pwd | sudo -S id"
However, i needed to do some commands as root, not only because this part of the script, but a few more things, otherwise, it would not work

I will rewrite the script in the future, but at that time, im gonna make something much more complex and gonna take my take to study better about shell script, but for now, i would like to know if there's an quick solution or workaround to this problem

Everytime when the script try to UMOUNT and the NAS is already mounted, everyone in the network cant connect anymore to the Server Computer. By this point, there is just two solutions: rebooting or umounting manually.

I can assure the umount is what's causing that because i deactivated the script for an entire month just to make sure what was going on, and in that month we didn't had any kind of problems, so last week i reactivated the script, at the friday the script started running, and now on the monday, everyone was with the problem to connect into the server computer

And just in case anyone asks what error do we get, it is the error: "the network path was not found"

One more thing, this problem just happen into computers running windows (the server is ubuntu 18.04, so we use samba to share files)