Re: [Bug-xorriso] building libisofs-1.4.4, libburn-1.4.4, libisoburn-1.4.4 on OpenBSD

[Thomas Schmitt]

Hi,

more things to check for documentation and build system:

- What permissions are needed to operate a drive ?
- How to persistently set these permissions ?
- Weren't there preparations necessary for #include and linking ?
- In what range of OpenBSD versions is libburn/sg-netbsd.c supposed to work ?
- Are there special precautions needed to mount regular files ?
- How to mount a ISO 9660 CD/DVD/BD with offset ?

The spots where the answers will matter are:

---------------------------------------------------------------------
What permissions are needed to operate a drive ?
---------------------------------------------------------------------

libisoburn-*/README:
"On Linux, FreeBSD, NetBSD this means -rw-permissions, even if only reading is
 intended. On Solaris one needs privileges "basic,sys_devices" and r-permission,
"

libisoburn-*/xorriso/README_gnu_xorriso:
"On Linux, FreeBSD, and NetBSD, rw-permissions are needed.
 On Solaris, the privilege "sys_devices" and r-permission are needed."

libisoburn-*/xorriso/xorrecord.texi:
"On GNU/Linux, FreeBSD, and NetBSD, the user needs rw-permission for the
 device file."

libisoburn-*/xorriso/xorriso.texi:
"On Linux, FreeBSD or NetBSD consider to give rw-permissions to those users
 or groups which shall be able to use the drives with @command{xorriso}."

libisoburn-*/xorriso/xorriso_eng.html:
"GNU/Linux, FreeBSD, NetBSD demand rw-permission."

libburn-*/cdrskin/README:
"On FreeBSD, device rw-permissions are to be set in /etc/devfs.rules.
 On Solaris, pfexec privileges may be restricted to "basic,sys_devices".
 On NetBSD, rw-permission may be granted by chmod a+rw /dev/rcd?d."

libburn-*/cdrskin/README:
"Linux, FreeBSD, and NetBSD demand rw-permission."

libburn-*/cdrskin/cdrskin_eng.html
"Linux, FreeBSD, and NetBSD demand rw-permission."

---------------------------------------------------------------------
How to persistently set these permissions ?
---------------------------------------------------------------------

libisoburn-*/xorriso/README_gnu_xorriso:
libburn-*/cdrskin/README:
"On NetBSD:
  Allow rw-access to the drives
  chgrp floppy /dev/rcd[01]d
  chmod g+rw   /dev/rcd[01]d
"

---------------------------------------------------------------------
Weren't there preparations necessary for #include and linking ?
---------------------------------------------------------------------

libisoburn-*/acinclude.m4 has:

netbsd*)
        LDFLAGS="$LDFLAGS -L/usr/local/lib -L/usr/pkg/lib"
        CPPFLAGS="$CPPFLAGS -I/usr/local/include -I/usr/pkg/include"

---------------------------------------------------------------------
In what range of OpenBSD versions is libburn/sg-netbsd.c supposed to work ?
---------------------------------------------------------------------

libburn-*/libburn/sg-netbsd.c:
"Present implementation: NetBSD 6, ioctl SCIOCCOMMAND
                         OpenBSD 5.9, ioctl SCIOCCOMMAND
"

libburn-*/libburn/os-netbsd.h
"   Operating system specific libburn definitions and declarations. Included
    by os.h in case of compilation for
            NetBSD 6 or OpenBSD 5.9
            with  MMC transport adapter sg-netbsd.c
"

(This state has been preliminarily commited by:
   http://libburnia-project.org/changeset/5723
)

---------------------------------------------------------------------
Are there special precautions needed to mount regular files ?
---------------------------------------------------------------------

libisoburn-*/xorriso/disk_ops.c:

     Xorriso_msgs_submit(xorriso, 0,
           "Detected regular file as mount device with BSD style command.",
           0, "FAILURE", 0);
     if(sys_code == 2) {
       Xorriso_msgs_submit(xorriso, 0,
"Command mdconfig -a -t vnode -f can create a device node which uses the file",
                         0, "HINT", 0);
     } else {
       Xorriso_msgs_submit(xorriso, 0,
     "Command  vnconfig -c vndX  can create a device node which uses the file",
                         0, "HINT", 0);
     }

(sys_code==2 is FreeBSD, syscode==3 is NetBSD.)

---------------------------------------------------------------------
How to mount a ISO 9660 CD/DVD/BD with offset ?
---------------------------------------------------------------------

libisoburn-*/xorriso/disk_ops.c:

     if(sys_code == 3 && strncmp(devadr, "/dev/rcd", 8) == 0) {
       sprintf(cooked_dev, "/dev/cd%s", devadr + 8);
       eff_dev= cooked_dev;
     }
     sprintf(form,
         "%smount_cd9660 -o noexec,nosuid -s %%sbsector%% %%device%% %s",
         (flag & 1 ? "/sbin/" : ""), Text_shellsafe(cpt, sfe, 0));

I.e. would

  /sbin/mount_cd9660 -o noexec,nosuid -s 0 /dev/cd0

mount the CD drive which has burner address /dev/rcd0c ?

(Best would be a test with a multi session ISO and non-0 -s argument.)

---------------------------------------------------------------------

Have a nice day :)

Thomas