On 03/23/10 11:50 AM, William Schumann wrote:
I have been experimenting with the pkg.client.api API to get the
expected disk usage for the installer, given a set of packages. There
are no examples in the documentation, which is in "pydoc
pkg.client.api", but I came up with this (some code removed):
api_inst = api.ImageInterface(img_dir, CLIENT_API_VERSION,
progresstracker, None, PKG_CLIENT_NAME)
api.image_create(PKG_CLIENT_NAME, CLIENT_API_VERSION, img_dir,
IMG_TYPE_ENTIRE, False,
repo_uri="http://ipkg.sfbay/dev";,
progtrack=progress.QuietProgressTracker(), mirrors = mirrors, force=True)
image_create() returns an ImageInterface object for the image that was
created, so there's no reason for the first assignment line.
The first line you have would only be used if the image already existed,
and the image_create() only if the image did not already exist.
As a general sidenote, if the arguments are keyword, always use the
keyword name as the position of them is not guaranteed.
api_inst.plan_install(pkglist,refresh_catalogs=True,noexecute=False,verbose=True,
update_index=True)
ret = api_inst.info("*", True, api.PackageInfo.ALL_OPTIONS)
First, you should be passing the actual list of packages that are in the
plan instead of '*' to info(). To get that, call api_inst.describe() to
get a plan description object:
plan = api_inst.describe()
To get the list of FMRIs for the packages that will be installed can be
retrieved using:
pkg_list = [dest.fmri for src, dest in plan.get_changes()]
Also, instead of use api.PackageInfo.ALL_OPTIONS, you should really only
specify just the information you need. In this particular case, I'd
guess that you only need to be able to identify the results by FMRI and
size, so you'd use this for the options parameter:
info_opts = frozenset([pkg.client.api.PackageInfo.SIZE])
You actually shouldn't have to make the call to info() at all, the
get_changes() call above should have given you fully populated
PackageInfo objects with the size already. However, the RFEs to do that
haven't been implemented yet.
pis = ret[api.ImageInterface.INFO_FOUND]
for i, pi in enumerate(pis):
print pi.pkg_stem,"size",pi.size
The bits are not actually downloaded, but the info() method returns a
list of packages with size information.
Will summing pi.size be a good estimation of disk space usage?
Yes, for a clean install case (which is your case), summing pi.size
should give you a good estimation of the amount of disk usage that the
installed packages will used.
Keep in mind that this won't give you an estimate of how much space the
download phase will need to store all of the compressed package data
that's retrieved, the package manifests (which were retrieved during the
plan_install call), any space used by SMF services that will be started
when the image is "booted", or any temporary files needed by the
packaging system during the operation.
Cheers,
--
Shawn Walker
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