The Package Manager is available on the Live CD desktop.  You can click 
to start it
from the desktop.  I don't think it is too useful to have it there, and 
perhaps having
it there will confuse people, because of the following reasons:

1) While running from the Live CD, you can't delete any packages since 
all the
data in /var/pkg is read-only.  However, the "delete" operation from 
Package Manager
is not disabled in the Live CD env.  So, you can still click on delete, 
and it will try, and
it won't even get to failing to delete the package, it will fail on "out 
of space" which
I will discuss in item 2.

2) When adding or deleting any package, the search index will be built, 
since the
Distro Constructor deliberately don't build the search index while the 
image is created.
The search index is huge, it will not fit in the limited amount of space
allocated for the root archive.  So, we will always run out of space.
I looked through the Package Manager, and I don't see an option to not 
build the index.

3) Though adding packages work in the Live CD env, only a very small set of
packages that don't write to any of the read-only areas can be added, 
and people
should take care to add them using the pkg command with the --no-index 
option.

So, since adding/deleting packages using the Package Manager will always 
fail.
Why include it in the desktop?

--Karen

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