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Delete file from network share with scripts on unified MTP1200

Created by: qamerlynck at: 5/16/2023 11:16 AM (7 Replies)

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5/16/2023 11:16 AM	Rate (0)
qamerlynck Regular Member Joined: 3/4/2021 Last visit: 11/14/2024 Posts: 16 Rating: (0)	Is it possible to delete a file from a network share with scripting on an unified MTP1200 panel? I can copy files to the share with the StartProgram function wich runs '/opt/siemens/App_Restriction/copy.sh'. I was also thinking about writing my own shell script to delete files but I can't paste files in the /opt/siemens/App_Restriction/ folder. If I copy the copy.sh function to another folder the function doesn't work, wich makes me thing the StartProgram function can only launch scripts from the /opt/siemens/App_Restriction/ folder.

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5/16/2023 11:29 AM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 11/18/2024 Posts: 3288 Rating: (511)	Hi qamerlynck, You can use StartProgram to run bash scripts outside of /opt/siemens/App_Restriction/. However, you must be aware of user permissions and the difference between scheduled tasks and runtime scripts. Scheduled tasks run as user "scs", while runtime scripts (dynamizations or events) run as "industrial". In the case of network shares, you also need to know that they are mounted by the system as user "industrial", where only that user has write access. This means that you can only access the network share within runtime scripts. Kind regards Stefan

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5/17/2023 6:13 AM	Rate (0)
qamerlynck Regular Member Joined: 3/4/2021 Last visit: 11/14/2024 Posts: 16 Rating: (0)	How are the user permissions build up? I want to control the writing to the shared folder from my plc. Like you said this doesn't work with a scheduled task. I was thinking of putting an object on the screen with a cyclic dynamization but i'm sure this isn't the proper way to do this.

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5/17/2023 7:22 AM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 11/18/2024 Posts: 3288 Rating: (511)	Hi qamerlynck, User privileges are defined by the system and cannot be changed. This restriction was changed in V17 Update 6 and should be changed in V18 Update 2. In V17 Update 6, it's not just the user that has write permission, it's the user group. And both users 'industrial' and 'scs' are members of the 'industrial' group. Kind regards Stefan

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5/17/2023 7:39 AM	Rate (0)
qamerlynck Regular Member Joined: 3/4/2021 Last visit: 11/14/2024 Posts: 16 Rating: (0)	Thanks Stefan! Now that I now that you can't run the bash script from the scheduled task I just placed a rectangle on the screen and have this script on border width with a trigger of 1s: //Only execute if start command is given by plc if (Tags("bStartScriptCheckDrive").Read() == true){ try { HMIRuntime.Device.SysFct.StartProgram("/opt/siemens/App_Restriction/checkNetworkDrive.sh", "", 0, true, HMIRuntime.Tags.SysFct.CreateSetTagCommand("sReturnCheckNetworkdrive")); //Reset start command Tags("bStartScriptCheckDrive").Write(false); //Indicate script done Tags("bScriptDoneCheckDrive").Write(true); } catch (err) { } } return 1; With this I can 'activate' the bash script from the plc. But I don't think it's the right way to do it like that. Is there a better way to do this?

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5/17/2023 8:10 AM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 11/18/2024 Posts: 3288 Rating: (511)	Hi qamerlynck, Basically your script is fine, but from a performance perspective I would recommend changing the trigger to a "Tags" or as of V18 "Tags - automatic". Kind regards Stefan

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5/17/2023 8:29 AM	Rate (0)
qamerlynck Regular Member Joined: 3/4/2021 Last visit: 11/14/2024 Posts: 16 Rating: (0)	Thank you Stefan, i will do it like that! I want to come back to my initial question about the deleting of files on a network share: I now know that to acces network shares thru a bash script, it needs to run in the runtime script. Can I create my own bash script to delete a file on a network share? If thats possible how can I run it in the 'StartProgram'? Copying files to /opt/siemens/App_Restriction/ is not possible, so would I need to put the bash script in another folder?

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5/17/2023 9:27 AM	Rate (1)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 11/18/2024 Posts: 3288 Rating: (511)	Hi qamerlynck, If you need a script that can be run by the 'industrial' user, you should place it somewhere in '/home/industrial'. You can use the "WriteFile" method to write the bash script to the panel. Alternatively, you can use the File Manager and some external or network storage to transfer an already prepared script to the Panel. Once the script file is available, you can run it using the "StartProgram" method. Depending on the number of files to be deleted, you can also consider using the "DeleteFile" or "DeleteDirectory" methods. Kind regards Stefan

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