I am in the process of writing an installer for a company product (we were
previously using Installshield). Once, released we will need the produce
patches for bug fixes and enhancements. The expectation that these patches will
consist of simply updating some of the released files and/or adding new files
not part of the initial distribution. I think we will generally do a minor
upgrade. In some cases the patches are dependent on a previous patch and in
other cases not.
Therefore I've been reading material about how we should structure our initial
release of the product to best enable but still have some questions about
things that aren't clear. Can someone help me here:
1. How can we generate the diff against the installed version for the
patches that can be installed in any order. We are not sure what the users
machine will have because they may have already applied one of the other
patches. Surely we don't need to generate a patch for each possible order of
installation of all the patches.
2. We can update the 3rd or 4th component of product version when doing
an upgrade/patch for some. Can someone explain the consequences of each option.
When we generate a diff for the patch, does the generated patch use the product
version and only patch against it or does it only patch products with matching
Product GUID and file versions.
3. When creating a patch, I want to explicitly specify the collection of
files (DLLs etc.) to be upgraded. I don't want any other existing files to be
touched. I have read that when you specify a patch components (i.e. via
ComponentRef) inside a PatchFamily element, any components in the same fragment
will also be updated. Can I avoid this without having to create different
fragments for every component in my product which is a bit of a pain.
4. As far as I can tell, you can always apply a patch (msp) multiple
times even if the product is already patched. Is there a way to flag that the
patch is already installed without updating the product version.
If there are any good sources of material which answer some of these questions,
please point them out to me.
Thanks in advance
sanjay
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