image image image

docs/create-image-file.md

@@ -1,15 +1,35 @@
 
-1. download image
-1. extract image
-1. enlarge image with 'truncate'
-1. mount as loopback device
-1. modify image
-    1. modify partition table with fdisk
-        1. resize partition for rfs
-    1. resize filesystem
-    1. mount boot partition
-        1. make file 'ssh'
-        1. make user config
-        1. remove image resize from config file ~'cmdline.txt'
-    1. mount rootfs partition
-        1. do stuff
+## get/create image file
+download and extract an image file **or** create one using `dd if=/dev/zero of=<image-file> bs=<block-size> count=<count>`.
+
+## set image size
+set image size with `truncate --size=<size> <image-file>`. this is usually used to increase image size in order to increase the file system size (i.e. make more space for rootfs)
+
+## mount image
+to mount an image file use 
+```bash
+mount -o loop <path/to/image-file> <mount-point>
+```
+if the image contains multiple partitions one needs to setup a loop device first:
+```bash
+losetup --find --show <path/to/image-file> -P
+```
+afterwards the partitions of the image should be shown as loopXpY and can be mounted like any other device.
+
+## modify partition table with fdisk
+
+### resize partition for rootfs
+
+## resize filesystem
+
+## mount boot partition
+
+### make file 'ssh'
+
+### make user config
+
+### remove image resize from config file ~'cmdline.txt'
+
+## mount rootfs partition
+
+### do stuff