anaconda has the capability to incorporate updates at runtime to fix any bugs or issues with the installer. These updates are generally distributed as a disk image file (referred to as
updates.img from here on out). The
updates.img can be used in a few different ways.
There are a number of sources for the updates.
Updates from the Network
The easiest and most popular way to use an
update.img is via the network. This is how almost all updates images you'll see in bug reports and mailing lists are distributed. This does not require you modify your installation tree at all.
To use this method, simply boot with:
If you have multiple network interfaces, anaconda will first prompt you to select one (unless you have used the
ksdevice= boot parameter). It will then attempt to configure this link using DHCP. If you require other networking configuration, you will need to use various options.
ksdevice= can be used to specify a different network device, and the
ip= option (along with others for gateway, nameserver, and so forth) can be used for static configuration. All anaconda config options are described elsewhere .
If you are making your own
updates.img, just upload it to a web server you have access to and pass the location as above.
Updates from a disk image
You can also put an
updates.img on a block device (either a floppy or a USB key). This can be done only with an ext2 filesystem type of updates.img. For a floppy drive, insert your floppy and then run
dd if=updates.img of=/dev/fd0 bs=72k count=20
to put the contents of the image on your floppy. Then, boot the installer with
and you will be prompted to provide the location of your update disk.
You can also use a USB key or flash media -- just replace
/dev/fd0 with the device that your USB key is at.
Updates from the Tree
If you're doing a CD, hard drive, HTTP, or FTP install you can also put the
updates.img in your tree to be picked up by all installs automatically. Put the file in the
For NFS installs, there are two options. You can either put the image in
images/ as above or explode the image into the
RHupdates/ directory in your installation tree.
How to Create an Anaconda Updates Image
If you are working on anaconda or looking at a bug and want to test your own bug fixes, it's easy to create your own
updates.img file. anaconda supports two formats: an ext2 filesystem image and the more common gzip-compressed cpio archive. The automatic tools shipped with anaconda deal in the second form, so that's what will be discussed here.
The easiest way to create an image is to run
from the anaconda source tree. This will package up all the changes to the tree since the last release and create a file named "updates.img" in the top of the tree. If you need finer control over this process (like creating an image from an even older release), run
by hand. The help screen documents the several options that can be used.
updates.img can include more than just files from anaconda, though. It can also include shared libraries, graphics, other python modules, and certain data files used by anaconda. To add files to an existing image (or create an entirely new one), just do the following:
scripts/upd-updates updates.img file1 file2 ...
Note that the placement of files in an image is a little picky. For instance, python modules must be in their proper subdirectory mirroring the layout of
How to Examine an Anaconda Updates Image
updates.img files provided by the Fedora project are compressed cpio archives. To examine one of these files, use
To explode one, do the following:
$ mkdir dest $ cd dest $ gunzip -dc /path/to/updates.img | cpio -id