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[[!comment format=mdwn
username="baffo32"
subject="Use-case expansion"
date="2016-06-17T23:55:52Z"
content="""
My use-case is to store the absolute disk offsets for files, to aid recovery in case of accidental loss.
I'd like to run a script for every key added to the repo in which the script resides. The script calls filefrag to determine the physical location of the key on the disk and adds it as metadata.
If interested, my pre-commit-annex snippet is:
# requires recent e2fsprogs
if [ -x /usr/sbin/filefrag ]
then
field=\"$(git config annex.uuid)\"-extents
LC_ALL=C /usr/sbin/filefrag -ev \"$f\" | sed -n \
-e 's/.*([0-9]* blocks* of \([0-9]*\) bytes).*/!bs \1/p'\
-e 's/^ *[0-9]*: *\([0-9]*\)\.\. *[0-9]*: *\([0-9]*\)\.\. *[0-9]*: *\([0-9]*\): *.*/\1 \2 \3/p' |
while read value
do
# !bs 4096 means values are in multiples of 4096 bytes (blocksize)
# 0 5287839 5 means 5 blocks starting at block 0 of the file start at block 5287839 of the disk
# extents which are not listed are from sparse files and contain all zeros
equal='+=' addmeta \"$f\" \"$field\" \"$value\"
done
fi
"""]]
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