Jim Meyering wrote:
Curtis Gedak wrote:
My testing using blkid to detect file systems on devices with a 4096
byte sector size has proven quite promising. One difference of note
is that blkid does not display an entry for extended partitions.
Do you mean that libblkid does not display a file system type for
an msdos extended partition? That makes sense, since the
extended partition is just a container for other partitions,
and hence has no file system of its own.
I have not worked with the libblkid library directly myself. It might
or might not recognize an msdos partition table extended partition.
My observation is that the blkid command will not return any textual
information if run on an extended partition.
For example if /dev/sda4 is an extended partition, the following command
will not return any text:
$ blkid -c /dev/null /dev/sda4
$ echo $?
2
$
The return code value is 2 in this case.
For primary and logical partitions containing a file system, the return
code appears to be 0.
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