plan9fox/rc/bin/fstype

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#!/bin/rc
m=`{dd -if $1 -bs 2048 -skip 16 >[2]/dev/null | xd -c | sed 1q | \
sed 's/.........(....................).*/\1/; s/ //g'}
if(~ $"m 01CD00101){
echo 9660
exit
}
dd -if $1 -count 1 >[2]/dev/null | \
awk '
/^kfs/{fs["kfs"]++}
/^(blocksize|daddrbits|daddrbits|indirblks|dirblks|namelen)/{p[$1]=$2}
END{
ca["fs", "blocksize"] = 4*1024
ca["fs", "namelen"] = 28
ca["fs", "dirblks"] = 6
ca["fs", "indirblks"] = 2
ca["fs", "daddrbits"] = 32
ca["fs64", "blocksize"] = 8*1024
ca["fs64", "namelen"] = 56
ca["fs64", "dirblks"] = 6
ca["fs64", "indirblks"] = 4
ca["fs64", "daddrbits"] = 64
ca["cwfs", "blocksize"] = 16*1024
ca["cwfs", "namelen"] = 28
ca["cwfs", "dirblks"] = 6
ca["cwfs", "indirblks"] = 2
ca["cwfs", "daddrbits"] = 32
ca["cwfs64", "blocksize"] = 16*1024
ca["cwfs64", "namelen"] = 56
ca["cwfs64", "dirblks"] = 6
ca["cwfs64", "indirblks"] = 4
ca["cwfs64", "daddrbits"] = 64
ca["cwfs64x", "blocksize"] = 16*1024
ca["cwfs64x", "namelen"] = 144
ca["cwfs64x", "dirblks"] = 6
ca["cwfs64x", "indirblks"] = 4
ca["cwfs64x", "daddrbits"] = 64
for(e in ca){
split(e, k, SUBSEP)
if(ca[k[1],k[2]] == p[k[2]])
fs[k[1]]++
}
for(i in fs)
if(fs[i] > fs[j])
j=i
if(fs[j]){
print j
exit
}
exit 1
}
'