Mrthdrb

when i execute setup:upgrade command then some file is generated in generated/ folder.
after i have execute chmod -R 777 /generated command
but when i check in some admin page like : Product grid page then it will showing below error :

Class MagentoCatalogModelViewAssetImageFactory does not exist

so i need to go into this directory

generated/code/Magento/Catalog/Model/View/Asset

and when i check this folder permission then it will showing 775 so i need to change permission 777 into Asset folder so then it will working fine.

so what is solution to every time update folder permission ?
any idea please share.

Don't give 777 permission as it is not recommended. Try these commands

find var generated vendor pub/static pub/media app/etc -type f -exec chmod g+w +
find var generated vendor pub/static pub/media app/etc -type d -exec chmod g+ws +
sudo chown -R :<web server group> .
chmod u+x bin/magento

chmod g+w gives write permission to the group owner for those directories. chmod g+ws sets up the group id to the directory where all new files and created in that directory inherit the group id of the parent directory.

So after running the setup:upgrade command, have you run the setup:static-content:deploy command, as running setup upgrade will clean the file system such cache, generated and static files

instead of chmod -R 777 /generated use chmod -R 777 generated

as /generate represent that your generate directory is at your server root directory

You can use 777 (all permission) but it's not secured on server, it's fine with localhost only:

chmod -R 777 generated

When using server you can give permission to specific user group using below commands:

chown -R username:groupname generated

NOTE: Go to magento root directory for using these commands.

You can Give All read and write permission to you generated Folder By

chmod +rwx generated