My company sells software that installs into /opt/company/product and creates a system user to run the services. The postinst routine uses chown on the product folder.
This is a manual test I did (this is CentOS 7):
[root@localhost ~]# cd /opt/company/product/
[root@localhost product]# ls -l
total 0
drw-rw-r--. 2 produser produser 6 Jan 25 01:04 backup
drwxr-xr-x. 2 produser produser 92 Jan 25 03:33 bin
drwxr-xr-x. 2 produser produser 64 Jan 25 03:33 etc
drwxr-xr-x. 2 produser produser 44 Jan 25 01:35 log
[root@localhost product]# su produser
sh-4.2$ cd backup
sh: cd: backup/: Permission denied
produser is the owner, I thought it should have enough permissions to do whatever it wants in those folders? It can neither change into the backup folder nor new folders. What am I missing here?
xpermissions on the directory in question (and every parent of that directory). – Kusalananda Jan 25 '24 at 11:21