NFS is often used for accessing network shares from Raspbmc, due to its low overhead. Many tutorials describe how to set this up, for example with a Synology NAS. One subject isn’t covered much, though: A setup with restrictive permissions.<\/p>\n
On my Synology my media files are usually owned by me, and has ‘dlna’ as group with read-only permissions. Example:<\/p>\n
\r\ndrwxr-x--- 9 jacob dlna 4096 Jun 15 2012 video\r\n<\/pre>\nOn the NAS I have created a user for Raspbmc and made it a member of this group:<\/p>\n
\r\nDiskStation> cat \/etc\/group | grep dlna\r\ndlna:x:65536:admin,jacob,raspbmc\r\nDiskStation> cat \/etc\/passwd | grep raspbmc\r\nraspbmc:x:1046:100:Raspberry Pie XBMC:\/var\/services\/homes\/raspbmc:\/sbin\/nologin\r\n<\/pre>\nTo get this to work on the Raspberry I’ve first had to synchronize the GID\/UID’s. Since the NAS is the master, I’ve done this on the Raspberry (logged in as the pi<\/strong> user):<\/p>\n
\r\npi@raspbmc:~$ sudo groupadd -g 65536 dlna\r\npi@raspbmc:~$ sudo usermod -a -G dlna pi\r\n<\/pre>\nAfter enabling root access, I’ve changed the pi<\/strong> user to match the UID of the raspbmc<\/strong> user on the NAS:<\/p>\n
\r\nroot@raspbmc:~# usermod -u 1046 pi\r\n<\/pre>\n(For this to work I had to kill a number of processes first)<\/p>\n
Changing UID of the pi<\/strong> user will cause a lot of trouble for Raspbmc, which expects the user to have UID 1000. This is hardcoded in at least two scripts:<\/p>\n
\n
- \/opt\/xbmc-bcm\/xbmc-bin\/share\/xbmc\/addons\/script.raspbmc.settings\/default.py<\/li>\n
- \/opt\/xbmc-bcm\/xbmc-bin\/share\/xbmc\/addons\/script.raspbmc.settings\/autostart.py<\/li>\n<\/ul>\n
Fix this by adding:<\/p>\n
\r\nsed -i 's\/getpwuid(1000)\/getpwuid(1046)\/g' \/opt\/xbmc-bcm\/xbmc-bin\/share\/xbmc\/addons\/script.raspbmc.settings\/default.py\r\nsed -i 's\/getpwuid(1000)\/getpwuid(1046)\/g' \/opt\/xbmc-bcm\/xbmc-bin\/share\/xbmc\/addons\/script.raspbmc.settings\/autostart.py\r\n<\/pre>\nto \/etc\/rc.local so the scripts are automatically fixed during startup. Replace 1046 with your pi<\/strong> UID.<\/p>\n
Without this fix automatic updates won’t work, and you’ll see script errors during startup – and can’t launch the Raspbmc settings.<\/p>\n","protected":false},"excerpt":{"rendered":"
NFS is often used for accessing network shares from Raspbmc, due to its low overhead. Many tutorials describe how to set this up, for example with a Synology NAS. One subject isn’t covered much, though: A setup with restrictive permissions. … Continue reading