[Server-devel] rpi storage devices

[Tim Moody]

on the xo-4 and intel I use the following to get storage devices
ls -lav /dev |grep brw| grep disk| gawk 'NR==1' |gawk  --field-separator=' ' '{ print $10 }'
but on rpi2 this yields
brw-rw----   1 root disk    7,   0 Mar  8 18:30 loop0brw-rw----   1 root disk    7,   1 Dec 31  1969 loop1brw-rw----   1 root disk    7,   2 Dec 31  1969 loop2brw-rw----   1 root disk    7,   3 Dec 31  1969 loop3brw-rw----   1 root disk    7,   4 Dec 31  1969 loop4brw-rw----   1 root disk    7,   5 Dec 31  1969 loop5brw-rw----   1 root disk    7,   6 Dec 31  1969 loop6brw-rw----   1 root disk    7,   7 Dec 31  1969 loop7brw-rw----   1 root disk  179,   0 Dec 31  1969 mmcblk0brw-rw----   1 root disk  179,   1 Dec 31  1969 mmcblk0p1brw-rw----   1 root disk  179,   2 Dec 31  1969 mmcblk0p2brw-rw----   1 root disk  179,   3 Dec 31  1969 mmcblk0p3brw-rw----   1 root disk    1,   0 Dec 31  1969 ram0brw-rw----   1 root disk    1,   1 Dec 31  1969 ram1brw-rw----   1 root disk    1,   2 Dec 31  1969 ram2brw-rw----   1 root disk    1,   3 Dec 31  1969 ram3brw-rw----   1 root disk    1,   4 Dec 31  1969 ram4brw-rw----   1 root disk    1,   5 Dec 31  1969 ram5brw-rw----   1 root disk    1,   6 Dec 31  1969 ram6brw-rw----   1 root disk    1,   7 Dec 31  1969 ram7brw-rw----   1 root disk    1,   8 Dec 31  1969 ram8brw-rw----   1 root disk    1,   9 Dec 31  1969 ram9brw-rw----   1 root disk    1,  10 Dec 31  1969 ram10brw-rw----   1 root disk    1,  11 Dec 31  1969 ram11brw-rw----   1 root disk    1,  12 Dec 31  1969 ram12brw-rw----   1 root disk    1,  13 Dec 31  1969 ram13brw-rw----   1 root disk    1,  14 Dec 31  1969 ram14brw-rw----   1 root disk    1,  15 Dec 31  1969 ram15brw-rw----   1 root disk    8,   0 Dec 31  1969 sdabrw-rw----   1 root disk    8,   1 Dec 31  1969 sda1
is there a reliable algorithm to identify sd cards, usb thumb drives or hdd drives? 		 	   		  
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