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Disk image grammar

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Steve Divskinsy
2017-05-04 10:09:08 +09:30
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parent d4bc1133d2
commit b5e73dedb9
1 changed files with 7 additions and 7 deletions
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README.md
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@@ -138,16 +138,16 @@ specific things.
Building the Disk Image Building the Disk Image
----------------------- -----------------------
Installing a OS on a file instead of a real disk complicates things but this Installing an OS on a file instead of a real disk complicates things but this
makes development and testing easier. makes development and testing easier.
So let's start by allocating a new file of size 100M by doing ``fallocate -l100M So let's start by allocating a new file of size 100M by doing ``fallocate -l100M
image``(some distro's don't have ``fallocate`` so you can do ``dd if=/dev/zero image``(some distro's don't have ``fallocate`` so you can do ``dd if=/dev/zero
of=image bs=1M count=100`` instead). And then we format it like we would format of=image bs=1M count=100`` instead). And then we format it like we would format
a disk with ``fdisk image``. It automatically creates a MBR partition table for a disk with ``fdisk image``. It automatically creates an MBR partition table for
us and we'll create just one partition filling the whole image by pressing 'n' and us and we'll create just one partition filling the whole image by pressing 'n' and
afterwards just use the default options for everything and keep spamming 'enter' afterwards just use the default options for everything and keep spamming 'enter'
untill you're done. Finally press 'w' exit and to write the changes to the until you're done. Finally press 'w' exit and to write the changes to the
image. image.
```bash ```bash
$ fdisk image $ fdisk image
@@ -192,8 +192,8 @@ my case. Let's make a filesystem on it.
```bash ```bash
$ mkfs.ext4 /dev/loop0p1 $ mkfs.ext4 /dev/loop0p1
``` ```
If you want to use something else than ext4, be sure to enable it when If you want to use something other than ext4, be sure to enable it when
configuring your kernel. Now that we have done that, we can mount it start configuring your kernel. Now that we have done that, we can mount it and start
putting everything in place. putting everything in place.
```bash ```bash
$ mkdir image_root $ mkdir image_root
@@ -218,7 +218,7 @@ We'll copy our binaries over.
$ cp /path/to/busybox usr/bin/busybox $ cp /path/to/busybox usr/bin/busybox
$ cp /path/to/bzImage boot/bzImage $ cp /path/to/bzImage boot/bzImage
``` ```
You can call every busybox utility by supplying the utility as argument, like You can call every busybox utility by supplying the utility as an argument, like
so: ``busybox ls --help``. But busybox also detects by what name it is called so: ``busybox ls --help``. But busybox also detects by what name it is called
and then executes that utility. So you can put symlinks for each utility and and then executes that utility. So you can put symlinks for each utility and
busybox can figure out which utility you want by the symlink's name. busybox can figure out which utility you want by the symlink's name.
@@ -232,7 +232,7 @@ These symlinks might be incorrect from outside the system because of the
absolute path, but they work just fine from within the booted system. absolute path, but they work just fine from within the booted system.
Lastly, we'll copy some files from ``../filesystem`` to the image that will be Lastly, we'll copy some files from ``../filesystem`` to the image that will be
some use to us later. of some use to us later.
```bash ```bash
$ cp ../filesystem/{passwd,shadow,group,issue,profile,locale.sh,hosts,fstab} etc $ cp ../filesystem/{passwd,shadow,group,issue,profile,locale.sh,hosts,fstab} etc
$ install -Dm755 ../filesystem/simple.script usr/share/udhcpc/default.script $ install -Dm755 ../filesystem/simple.script usr/share/udhcpc/default.script