[Bug 108497] Re: The sysinfo script in Konvesation in Feisty does not display the diskspace anymore

[gnomon]

There are actually two problems this awk script: one is the obvious
problem of using the gawk-specific '**' to perform exponentiation rather
than the awk standard '^', and the other is an assumption that every
line of df output corresponds to a single record. Unfortunately this is
not the case: when device names are very line, df will helpfully break
records across multiple lines, like so:

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/sda4_crypt
                     450180024 395426136  32066144  93% /
varrun                  517168       192    516976   1% /var/run
varlock                 517168         0    517168   0% /var/lock
udev                    517168        96    517072   1% /dev
devshm                  517168         0    517168   0% /dev/shm
lrm                     517168     38176    478992   8% /lib/modules/2.6.24-17-generic/volatile
/dev/sdc2               972180     54892    868292   6% /boot
/dev/mapper/sdb1_crypt
                     307663284 218735800  73299080  75% /media/sdb1
/dev/mapper/sdc1_crypt
                     153834336  49176656  96843292  34% /media/sdc1
/dev/mapper/sdd1_crypt
                     484534988 269085988 191029828  59% /media/sdd1

In this case, we need slightly more sophisticated processing:

HDD=$(df -l | awk 'BEGIN {
	# In the output of df -l, the first field is the device name...
	TOT = 2 # ...the second field is the total size...
	USE = 3 # ...and the third field is the amount used.
	BLK = 1024^2
	# It is a small thing, but why recalculate the value of a block
	# on every line rather than just doing it once? Keeping this
	# definition up front makes it easier to modify in the future,
	# too: the script currently assumes 1-kilobyte blocks, but
	# that need not always be the case.
}
($1 ~ /^\/dev\// && NF == 1) {
# we handle the case of lines produced by df which feature only
# the device name, which is too long to fit into its column display,
# by grabbing the device name, forcing a new line to be read,
# then prepending the saved device name onto the new line.
# Then every line that we care about is in the same format. The
# next rule will then work in all cases.
	dev = $1
	getline
	$0 = dev " " $0
}
($1 ~ /^\/dev\//) {
	use += $USE / BLK
	tot += $TOT / BLK
}
END {
	printf "HD: %s / %s GB\n", use, tot
}')

-- 
The sysinfo script in Konvesation in Feisty does not display the diskspace anymore
https://bugs.launchpad.net/bugs/108497
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