Date: Mon, 23 Feb 2009 21:32:39 -0000 From: "Jasvinder S. Bahra" <bbdl21548@blueyonder.co.uk> To: <freebsd-questions@freebsd.org> Subject: Re: Accessing /dev/lpt0 in a Jail Message-ID: <8F3ADB585FA04899A147599EACBCBAE3@atlantis> References: <9F3E5C98058140F697CA8A46F31C6A4D@atlantis> <49A1EC64.3000703@datapipe.com>
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Paul, Thanks for your help - it's much appreciated. It looks like devfs rules are indeed what I need to play with. As i'm using ezjail, it seems things are a little different. Instead of editing the host's /etc/rc.conf file , and specifying the ruleset there, I had to edit the /usr/local/etc/ezjail/pearl_domain_org file. In that file, there is an entry that looks like this... export jail_pearl_domain_org_devfs_ruleset="devfsrules_jail" I changed that line to the following... export jail_pearl_domain_org_devfs_ruleset="devfsrules_jail_pearl" I then created (again, on the host) /etc/devfs.rules, and added the following to it... [devfsrules_jail_pearl=5] add include $devfsrules_hide_all add include $devfsrules_unhide_basic add include $devfsrules_unhide_login add path 'lpt*' unhide These changes successfully made the lpt0 (and lpt0.ctl) device nodes visible in the jail. Unfortunately, i'm now having permission problems... [root@pearl ~]# ls -al /dev/lpt* crw------- 1 root wheel 0, 53 Feb 23 21:11 /dev/lpt0 crw------- 1 root wheel 0, 54 Feb 23 21:11 /dev/lpt0.ctl I need the device nodes to have 0660 permissions and root:cups ownership. I can easily make these changes using the chown and chmod tools, but the changes do not survive a system reboot. Following some further research, I understand I can make these changes occur automatically by adding some entries in the jail's /etc/devfs.conf file... own 'lpt*' root:cups perm 'lpt*' 0660 Unfortunately, this didn't have any effect. I also tried creating a device ruleset in the jail (i.e. creating a /etc/devfs.rules file in the jail)... [localrules=5] add path 'lpt*' mode 0660 group cups ...and then applying that ruleset by adding the following to the jail's /etc/rc.conf devfs_system_ruleset="localrules" However, yet again the changes had no effect. Does anyone have any advice? Thanks, Jazz ----- Original Message ----- From: "Paul Procacci" <pprocacci@datapipe.com> To: "Jasvinder S. Bahra" <bbdl21548@blueyonder.co.uk> Cc: <freebsd-questions@freebsd.org> Sent: Monday, February 23, 2009 12:23 AM Subject: Re: Accessing /dev/lpt0 in a Jail > Jasvinder S. Bahra wrote: >> Hi, >> >> I'm trying to setup CUPS (in a jail) using an old parallel port printer >> on my server machine. >> >> I used ezjail to create a jail and then installed CUPS. I've got it up >> and running, and I can access the administration website. >> >> However, as far as I can tell, the admin website doesn't seem to offer >> any options regarding the parallel port. Following some research, I >> believe I somehow needs to create a /dev/lpt0 entry, *in* the jail. >> >> Now, that entry exists on the jail's host system, but theres a limited >> list of entries in the jail's /dev directory. If I do a "ls -al /dev" >> (less quotes) in the jail, I get the following... >> >> [root@pearl cups]# ls -al /dev >> total 0 >> dr-xr-xr-x 2 root wheel 512 Feb 22 19:04 fd >> lrwxr-xr-x 1 root wheel 14 Feb 22 19:04 log -> ../var/run/log >> crw-rw-rw- 1 root wheel 0, 16 Feb 22 19:22 null >> crw-rw-rw- 1 root wheel 0, 122 Feb 22 19:28 ptyp0 >> crw-rw-rw- 1 root wheel 0, 8 Feb 22 19:04 random >> lrwxr-xr-x 1 root wheel 4 Feb 22 19:04 stderr -> fd/2 >> lrwxr-xr-x 1 root wheel 4 Feb 22 19:04 stdin -> fd/0 >> lrwxr-xr-x 1 root wheel 4 Feb 22 19:04 stdout -> fd/1 >> crw--w---- 1 jazz tty 0, 123 Feb 22 19:28 ttyp0 >> lrwxr-xr-x 1 root wheel 6 Feb 22 19:04 urandom -> random >> crw-rw-rw- 1 root wheel 0, 17 Feb 22 19:04 zero >> >> Does anyone know how I go about providing the jail with a link to lpt0? >> >> Thanks, >> >> Jazz >> > > I've never used ezjail, as I usually setup jails myself. With that said, > access to dev entries within jail are/can be controlled by devfs rules. > The configuration for your rules is "administrator dependant". More > specifically, you should find a line in your rc.conf that looks similar to > the following: > > jail_devfs_ruleset="devfsrules_jail" > > This defines the ruleset used for your jails. Knowing this, you can now > edit your rules file (/etc/devfs.rules) and add appropriate entries for > your printer and associated devices. > > ~Paul > >
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