On 01/01/15 03:48, Matthias Apitz wrote:


Hello,

I have a small question and a small request re/ makefs && gpart:

There is a script src/release/i386/make-memstick.sh to create an image
from a full directory tree; the tree is result of

make installworld DESTDIR=/tree
make installkernel DESTDIR=/tree

the script mainly does:

...
makefs -B little -o label=FreeBSD_Install ${2} ${1}
if [ $? -ne 0 ]; then
        echo "makefs failed"
        exit 1
fi
rm ${1}/etc/fstab

unit=$(mdconfig -a -t vnode -f ${2})
if [ $? -ne 0 ]; then
        echo "mdconfig failed"
        exit 1
fi
gpart create -s BSD ${unit}
gpart bootcode -b ${1}/boot/boot ${unit}
gpart add -t freebsd-ufs ${unit}
mdconfig -d -u ${unit}

As you can see, it does makefs first, and after this it creates the
gpart structure in the image (i.e. in its memory file system).
Why is this in this order and where exactly starts the file system
created by makefs?


This is a quirk of BSD disklabels: the first partition can start at address 0 and the first 16 sectors of UFS2 file systems are reserved for the label headers. It's not portable to other partition schemes. For -CURRENT, this script has been replaced, by the way, and doesn't use BSD labels anymore.
-Nathan


The request is: it would also be nice if 'make-memstick.sh' would allow
to pass from the command line some values for the size of the file
system to be created in the image; I modified it to fit my needs as:

    size=15482880b
    ...
    makefs -B little -M ${size} -m ${size} -f 400000 ....

Thanks

        matthias


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