The instructions for installing MacOS X and the Developer Tools have the unfortunate property of not being copy-pastable. Here is a “corrected” version

# hdiutil create -fs HFS+ -volname 10-4-chroot-hfs -verbose -size 4g 10-4-chroot
# open 10-4-chroot.dmg

# export CM_BUILD=CM_BUILD
# sudo installer -verbose -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/System/Installation/Packages/BaseSystem.pkg -target /Volumes/10-4-chroot-hfs
# sudo installer -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/System/Installation/Packages/Essentials.pkg -target /Volumes/10-4-chroot-hfs
# sudo installer -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/System/Installation/Packages/BSD.pkg -target /Volumes/10-4-chroot-hfs
# sudo installer -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/System/Installation/Packages/X11User.pkg -target /Volumes/10-4-chroot-hfs

Assuming there were no errors you should have Mac OS X 10.4.x installed on the disk image Installing the Developers Tools
Install the Developer packages as described for the OS packages:

# sudo installer -verbose -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/Xcode\ Tools/Packages/DeveloperTools.pkg -target /Volumes/10-4-chroot-hfs
# sudo installer -verbose -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/Xcode\ Tools/Packages/MacOSX10.4.pkg -target /Volumes/10-4-chroot-hfs
# sudo installer -verbose -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/Xcode\ Tools/Packages/gcc3.3.pkg -target /Volumes/10-4-chroot-hfs
# sudo installer -verbose -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/Xcode\ Tools/Packages/gcc4.0.pkg -target /Volumes/10-4-chroot-hfs
# sudo installer -verbose -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/Xcode\ Tools/Packages/DevSDK.pkg -target /Volumes/10-4-chroot-hfs
# sudo installer -verbose -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/Xcode\ Tools/Packages/X11SDK.pkg -target /Volumes/10-4-chroot-hfs
# sudo installer -verbose -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/Xcode\ Tools/Packages/BSDSDK.pkg -target /Volumes/10-4-chroot-hfs 

There’s a number of useless Applications and bits of documentation you can clean up
this could stand to be fleshed out

# cd /Volumes/10-4-chroot-hfs
# cd Applications
# rm -rf iTunes.app

It might be useful to create a script like “prepare_osx_chroot.sh”

#!/bin/sh

CHROOT_NAME=10-4-chroot-hfs

mount -t devfs devfs /Volumes/${CHROOT_NAME}/dev
mount -t fdesc -o union stdin /Volumes/${CHROOT_NAME}/dev
mount_volfs /Volumes/${CHROOT_NAME}/.vol

After making the preparations above, enter the chroot environment by typing:

# sudo chroot /Volumes/10-4-chroot-hfs

While in chroot, download DarwinPorts sources, compile and install.

# cd tmp/
# curl -O http://www.darwinports.org/downloads/DarwinPorts-1.2.1.tar.bz2
# tar -xvjf DarwinPorts-1.2.1.tar.bz2
# cd DarwinPorts-1.2.1.tar.bz2
# ./configure && make && make install

Do the cleanup...

# cd ..
# rm -rf DarwinPorts-1.2.1*

and selfupdate.

# port -d selfupdate

Everything is ready to go experimenting with DarwinPorts. Maybe now is the time one might want to make a backup of the diskimage in case of messing it all up :)

One of the convenient features of OS X images is the ability to make an image read-only. Changes to the image are written into so-called “shadow” files. To revert to the original disk image, one simply removes the “shadow” file.

To convert the disk image to a read-only image, do the following:

# mv 10-4-chroot.dmg 10-4-chroot-rw.dmg
# hdiutil convert 10-4-chroot-rw.dmg -format UDRO -o 10-4-chroot-ro.dmg

Now, mounting the disk looks like:

# hdiutil attach 10-4-chroot-ro.dmg -shadow /tmp/10-4-chroot.shadow

You can revert back to the original version simply by executing rm /tmp/10-4-chroot.shadow.

If you find yourself wanting to make changes to the image, you have two options:

• Convert back to a read-write image (assuming you deleted the source to make space) then make changes:
  

Use chroot to make whatever changes are needed

# hdiutil convert 10-4-chroot-ro.dmg -format UDRW -o 10-4-chroot-rw.dmg
# hdiutil attach 10-4-chroot-rw.dmg
# hdiutil detach /Volumes/10-4-chroot-hfs
# hdiutil convert 10-4-chroot-rw.dmg -format UDRO -o 10-4-chroot-ro.dmg

• Work with the read-only image, then merge the shadow back to the read-write image. (Use this especially if you realize after the fact that you want to keep the changes.)

Use chroot to make whatever changes are needed

# hdiutil attach 10-4-chroot-ro.dmg -shadow /tmp/10-4-chroot-ro.shadow
# hdiutil detach /Volumes/10-4-chroot-hfs
# hdiutil convert 10-4-chroot-ro.dmg -format UDRW -o 10-4-chroot-rw.dmg -shadow /tmp/10-4-chroot-ro.shadow
# hdiutil convert 10-4-chroot-rw.dmg -format UDRO -o 10-4-chroot-ro.dmg

If you get an error like “C compiler could not create executable” during configure, try reinstalling DevSDK onto your chroot

# sudo installer -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/Xcode\ Tools/Packages/DevSDK.pkg -target /Volumes/10-4-chroot-hfs/

If one of the installers hangs on the configure phase, try running a top in your regular terminal. If you see something like crashdump taking a large percent of CPU resources, try performing

# sudo killall crashdump

Your port should continue installing as normal.

I have no idea why this happens or how it works, but it seems to help! Somebody please clear this up! Note: it seems to happen when you install gmp; the configure script is stuck on configure:1282: checking build system type

• A tale of creating a chroot