Cannot seem to write to usb drive using pi user

Question

Really simple problem, I have run the following commands:

sudo mkdir /media/usb
sudo chown -R pi:pi /media/usb
show chmod -R 775 /media/usb

Checked everything and made sure that pi owned the directory, and then ran:

sudo mount /dev/sda1 /media/usb -o uid=pi,gid=pi

The drive is ext4 and if I sudo it works (I can write to it) but I cannot seem to get it to work so pi can write without, because when I run the above the command it will reset all permissions to root.

I also cannot seem to get it to auto mount as pi.

I have eve install ntfs-3g incase that made any effect, but every time only root can write.

Here is the output of mounting:

pi@raspberrypi:/media $ sudo umount usb
pi@raspberrypi:/media $ ls -la
total 16
drwxr-xr-x   4 root root 4096 Sep 21 13:12 .
drwxr-xr-x  22 root root 4096 Jun 27 02:22 ..
drwxr-x---+  4 root root 4096 Sep 21 14:24 pi
drwxrwxr-x   2 pi   pi   4096 Sep 21 13:12 usb
pi@raspberrypi:/media $ sudo mount /dev/sda1 /media/usb -o uid=1000,gid=1000
pi@raspberrypi:/media $ cd usb
pi@raspberrypi:/media/usb $ ls -la
total 36
drwxr-xr-x 6 root root  4096 Sep 21 14:24 .
drwxr-xr-x 4 root root  4096 Sep 21 13:12 ..
drwxr-xr-x 2 root root  4096 Sep 21 14:24 dfgfdh
drwxr-xr-x 4 root root  4096 Sep 21 14:18 f
drwx------ 2 root root 16384 Sep 21 11:45 lost+found
drwxr-xr-x 2 root root  4096 Sep 21 14:23 swedtfr
pi@raspberrypi:/media/usb $ 

With options switched:

pi@raspberrypi:/media $ sudo mount -o uid=1000,gid=1000 /dev/sda1 /media/usb
pi@raspberrypi:/media $ cd usb
pi@raspberrypi:/media/usb $ ls -la
total 36
drwxr-xr-x 6 root root  4096 Sep 21 14:24 .
drwxr-xr-x 4 root root  4096 Sep 21 13:12 ..
drwxr-xr-x 2 root root  4096 Sep 21 14:24 dfgfdh
drwxr-xr-x 4 root root  4096 Sep 21 14:18 f
drwx------ 2 root root 16384 Sep 21 11:45 lost+found
drwxr-xr-x 2 root root  4096 Sep 21 14:23 swedtfr

Answer 1

Supposing the uid of pi is 1001, and the gid of pi's group is 201, you'd use

sudo mount  -o uid=1001,gid=201 /dev/sda1 /media/usb

You need to pass the id's, not the names, and the options go before device and mount point.

Let me give you an example:

ghp-amdphIIX4B:/root
# id ghp
UID=1000(ghp) GID=1000(ghp)
ghp-amdphIIX4B:/root
# mount -o uid=1000,gid=1000 /dev/sdc1 /mnt/sdc1
ghp-amdphIIX4B:/root
# ls -al /mnt/sdc1
totaal 9087532
drwxr-xr-x  4 ghp  ghp        8192 jan  1  1970 .
drwxr-xr-x 13 root root       4096 aug 11 16:15 ..
-rwxr-xr-x  1 ghp  ghp          21 jan  1  1980 .cm0013
drwxr-xr-x  3 ghp  ghp        8192 aug 11 16:17 Jennifer
drwxr-xr-x  2 ghp  ghp        8192 jun 11  2017 System Volume Information

One difference, my usb stick contains a vfat.