Re: [Libguestfs] [PATCH v2] NEW API: add blkid command to print the attributes of the device

On Sun, Dec 04, 2011 at 11:18:37AM +0800, Wanlong Gao wrote: Yup, you're right ... For '-p': '-c /dev/null' should be completely equivalent and it's what we use in the rest of daemon/blkid.c. Is there any other benefit to using '-p' instead of '-c /dev/null'? Obviously I didn't test this, which is why I didn't see that the '-i' option isn't supported on RHEL 5 ... I'll need to add a test for it. It seems pretty straightforward just comparing the blkid --help output on RHEL 5: $ /sbin/blkid --help /sbin/blkid: invalid option -- - blkid 1.0.0 (12-Feb-2003) usage: blkid [-c <file>] [-ghl] [-o format] [-s <tag>] [-t <token>] [-v] [-w <file>] [dev ...] -c cache file (default: /etc/blkid/blkid.tab, /dev/null = none) -g garbage collect the blkid cache -h print this usage message and exit -s show specified tag(s) (default show all tags) -t find device with a specific token (NAME=value pair) -l lookup the the first device with arguments specified by -t -v print version and exit -w write cache to different file (/dev/null = no write) dev specify device(s) to probe (default: all devices) versus upstream: $ blkid --help blkid: invalid option -- '-' blkid from util-linux 2.20.1 (libblkid 2.20.0, 19-Oct-2011) Usage: [...] -p low-level superblocks probing (bypass cache) -i gather information about I/O limits It is sufficient to grep the blkid --help stderr for '-i'. Which e2fsprogs program do you mean? Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones New in Fedora 11: Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 70 libraries supprt'd http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw