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Otherwise we end up using wrong uid/gid mappings when doing install
to alternate system root. Fixes #434.

the uid and gid are used in other places than just changing file
ownership on extraction.

We want remove dirs when they are unreferenced so we remove all dirs on
apk del, but we don't want remove dirs when closing database. So we make
removing dir optional when unreferencing it.

This partially reverts commit c7ffc96a.

fixes #406

Seems like recent eglibc requires that you include sys/stat.h

We want minimal static build. And this now also breaks with our openssl
since it tries to automatically dlopen some of the engine modules.

That way we can set sh options case by case

We we can upgrade rest of system just fine then.

Installed package does not need to be checked for availability.
Account for packages missing if they get pruned out due to
installability check.

The trigger list can be reused after it's cleared, make sure
the list node is initialized all the time.

Make the libapk and lua module optional at buildtime and off by default.
This is because enabling libapk requires that mkinitfs also copies the
libapk.so or the initramfs will not work.

To build libapk:

 make LIBAPK=yes

To build lua module (will enable LIBAPK=yes):

 make LUAAPK

To link apk to libapk (will enable LIBAPK=yes):

 make SHARED_LIBAPK=yes

All the above applies to make install target as well.

So open the db in read-only mode instead. This allows --simulate to
be run as non-root user.

Take the uid/gid from passwd and group.

The triggers are read during apk_db_unpack_pkg(). If we delete the
triggers list after then unpack we delete the triggers which is not
what we want.

This fixes bug introduced in ce3cf8bf

got broken to the previous array cleanup and grepping struct
definition only from headers.

Instead of having a null pointer, use a dummy array which just
says the array is empty. This helps in multiple places of the code
which would otherwise need explicitly need to check first if the
array exists. This has been cause of multiple seg.faults in the
past as the array check is easily omitted.

This also removes (or fixes) all existing checks accordingly.

clean up the triggers properly, in proper order.

especially important if the package requested from command line
does not exist. otherwise we would not print an error at all.

Print more information why installation changeset calculation failed.
Fixes #187.

To print upgrading if package is actually being changed instead of
pure reinstall.

If version is equal, but package contents are different we should
show the package being upgraded.

In addition to autocleaning dependencies on deletion, we need to
autoclean the old package on upgrade too. This is to make sure that
obsoleted dependencies (existed previously, but not in new package)
are removed where appropriate.

openssl BIO does not close the fd unless we explicitly tell it to
do so.

So it'll be easier to rebuild affected packages. Fixes #349.

Doing "apk add file.apk" adds a versioned dependency to allow
downgrading, and sticky version. Most often this is to install
single packages from newer repository. So it would make sense
to reset them to non-versioned if doing:

 apk upgrade -a

fixes #346