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-rwxr-xr-xarchiso/mkarchiso48
1 files changed, 29 insertions, 19 deletions
diff --git a/archiso/mkarchiso b/archiso/mkarchiso
index 7b706ca..b6d0f54 100755
--- a/archiso/mkarchiso
+++ b/archiso/mkarchiso
@@ -261,39 +261,49 @@ command_iso () {
command_usb () {
_imgcommon
-
- fsimg="${imgname}.part1"
+
+ modprobe -q loop
+
+ # Calculate cylinder size in bytes
+ CYL_SIZE=$((255*63*512))
+
+ # First partition offset
+ PART_OFFSET=$((63*512))
# ext2 overhead's upper bound is 6%, empirically tested up to 1GB
rootsize=$(du -bs "${work_dir}/iso" | cut -f1)
- imgsz=$(( (${rootsize}*106)/100/512 + 1)) # image size in sectors
+ imgsz=$(( (${rootsize}*106)/100/${CYL_SIZE} + 1 )) # image size in cylinders
+
+ # Get next free loop device
+ devloop=$(losetup -f)
# create the filesystem image file
- dd if=/dev/zero of="$fsimg" bs=512 count="$imgsz"
+ dd if=/dev/zero of="$imgname" bs="$CYL_SIZE" count="$imgsz"
+
+ # Setup a loop device, and skip the first 63 sectors
+ losetup "$devloop" -o "$PART_OFFSET" "$imgname"
# create a filesystem on the image
- mke2fs -m 0 -F -L "${LABEL}" "$fsimg"
+ mke2fs -m 0 -F -L "${LABEL}" "$devloop"
# mount the filesystem and copy data
- modprobe loop
TMPDIR=$(mktemp -d archiso-usbXXXXXX)
- mount -o loop "$fsimg" "$TMPDIR"
+ mount "$devloop" "$TMPDIR"
cp -a "${work_dir}"/iso/* "$TMPDIR"
- umount "$TMPDIR"
+ umount -d "$TMPDIR"
rm -rf "$TMPDIR"
- # add sectors 0-62, then glue together
- dd if=/dev/zero of="${imgname}" bs=512 count=63
- cat "$fsimg" >> "${imgname}"
- rm "$fsimg"
-
# create a partition table
- # if this looks like voodoo, it's because it is
- sfdisk -uS -f "${imgname}" << EOF
-63,$imgsz,83,*
-0,0,00
-0,0,00
-0,0,00
+ fdisk -C "$imgsz" -H 255 -S 63 "$imgname" << EOF
+n
+p
+1
+
+
+a
+1
+p
+w
EOF
# install grub on the image