ref: c7eae3fb729cf1831dc3f711444f2edf782a3e7d
dir: /rc/bin/fstype/
#!/bin/rc
rfork e
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
}
fn fat {
m=`{dd -if $1 -bs 1 -count 3 -skip $2 >[2]/dev/null}
~ $"m FAT
}
if(fat $1 54 || fat $1 82){
echo dos
exit
}
m=`{dd -if $1 -bs 4 -count 1 >[2]/dev/null | xd | sed 's,0000000 ,,;q'}
if(~ $"m 529ab12b){
echo paqfs
exit
}
if(~ $"m 011ce50d){
echo hjfs
exit
}
m=`{dd -if $1 -bs 16 -count 1 -skip 16 >[2]/dev/null}
if(~ $"m 'kfs wren device'){
echo kfs
exit
}
dd -if $1 -count 1 >[2]/dev/null | \
awk '
/^(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
}
'