[Dev] 3rd party so library installation feature

Carsten Haitzler c.haitzler at samsung.com
Wed Oct 16 03:34:36 GMT 2013

btw. my reply of "you re-invented rpm" is not a joke. what you want is a
package manager. please study up on rpm (since that is what we use for
the base os). you CAN have it use a DIFFERENT rpm database (--dbpath
option). so that rpm db can be owned by the USER not root/os. it can be
seeded with a single virtual package (the "tizen" package) that lists
all the files in the base tizen distro and then everything installed by
rpm depends on it. if the db is owned by the ouser then they USER (not
root) can run the commands happily. rpm SUPPORTS the concept of
relocatable pkgs...(--relocate), and supports the idea of depending on
specific FILES (like libBLAH.so.2) that meets your requirement of not
depending on pkg name. already done. shared libs ALREADY deal with
versioning by major version (libBLAH.so.1 seriesis forwards compatible
until libBLAH.so.2 when it broke - both can be installed at the same
time if packaged properly).

your requirements of "being able to remove a lib that breaks use by
apps" imho is a bad req - but it's possible to do (--force option for
rpm). it's utterly inadvisable though and it's better to just do what
rpm does by default - forbid uninstallation of the dependency (library).

why limit libraries to "partner" and "platform"? you do this then tizen
is not an open platform. simple. it's a walled garden for those "in the
private club only". and in that case tizen is no different to its
competitors. and if its no different then there is no reason for people
to use it or developers to target itbecause it simply has no userbase
compared to its competition.

also... please don't re-invent packaging via manifest xml files. rpm
already does all of this and much more in spec files with an entire
toolset that is well tested. you can forbid running of execution of
pre/post install and uninstall scripts with --noscriptsfor security.

ALL you need/want is some integration work. that means having a tool
that seeds a user-private rpmdb from the system rpm pkg set/files, and
that uses rpm to manage the dependencies/files/conflicts/upgrades etc.
etc. - maybe yum or apt on top etc. for the "fetch files from the
network" bits...and of course the gui bits that expose the
errors/conflicts and issues to the user at installation time.

everything you need and want is already done in rpm. its battle-tested,
enterprise-scale and much more mature than anything android has. it has
been pushed to solve problems far more expansive than what you list and
has come out the other end already. re-inventing this is not a good idea. :)

On 10/15/2013 09:10 PM, 함동읍 wrote:
> Dear All,
> I want to discuss "3rd party so library installation feature.
> Requirement
> 1. To provide a way to download a necessary shared library from authorized/dedicated site
> 2. If users want to use application B which uses a shared library, they download that library from the site by themselves.
> 3. When another application C requires the same library later, users can use it without additional download.
> 4. When the end user tries to remove application B owning the shared library that is required for other installed applications, the platform should warn the user that designated applications would not work correctly if the library is removed.
> 5. The platform should provide a naming service for the installed shared library so that any 3rd party application using it may locate and use (load) it without knowing the specific id of the owning package/application.
> Considerations
> 1. Library provider
>    1) Tizen app can be a library provider with specifying a tag and embedding the libraries.
>    2) Library provider specifies a tag in the manifest file.
>       a) <ProvideLibrary>http://tizen.org/library/name</ProvideLibrary>
>       b) This tag can be restricted to partner and platform privilege levels.
>    3) Libraries are located at /shared/res/ to share with other apps.
> 2. Library user
>    1) Library user specifies a tag in the manifest file.
>       a) <RequireLibrary>http://tizen.org/feature/library/name</RequireLibrary>
>    2) Library user has to check whether the library provider app has been installed or not.
>       a) The library provider app is not installed, request of installation is sent to Store client.
> 3. Platform package manager
>    1) Installed apps from Store should be uninstalled anytime when device user requests through the System settings.
>       a) Library provider app should be uninstalled anytime.
>       b) Deep relationship with library provider app and library user is not recommended.
>          Library user app can be working without library provider app, if needed.
>    2) Package manager can extract information of provider and users using manifest at installation time.
>       a) Package manager can display a warning popup to notify a message.
>          i.e. “If this app is uninstalled, [AppB, AppC and AppD] apps may not be working well.”
>       b) If the provider is uninstalled, the related user apps can be terminated, if needed.
>    3) Application libraries are located in app directory and don’t be moved to common library directory.
>       a) Library path is not specified in library user app.
>    4) Package Manager can support library path API using the key that is specified in manifest.xml.
> Appendix
> In Android, some apps use functionality and resources of another app
> 1. Several apps request functionality to an app
> 2. Several apps use an app as a service app
> 3. App accesses another app resource directly
> 4. Android supports <uses-library>, but these libraries are not downloaded by store but preloaded.
> Please check considerations and give me the feedback.
> Best regards,
> dongeup.

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