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Improves /etc/apk/repositories format so you can say:
http://nl.alpinelinux.org/alpine/v2.3/main
@edge http://nl.alpinelinux.org/alpine/edge/main
@testing http://nl.alpinelinux.org/alpine/edge/testing

After which you can pin dependencies to these tags using:
 apk add stableapp newapp@edge bleedingapp@testing

Apk will now by default only use the untagged repositories,
but adding a tag to specific dependency:
 1. will prefer that tag for the name
 2. allowing pulling in dependencies from that tag (though,
    it prefers untagged packages to satisfy deps if possible)

fixes #575

One can now say in dependency "!foo<2" which means, that if foo is
installed, it needs to be >=2, but it's not a required dependency.

If two packages replace each other, the one with highes priority
will keep the file. Additionally, if we have a package overriding
another's file it's remembered and handled properly. This is
essentially to allow "policy packages" which just overwrite certain
(configuration) files from other package(s).

"replaces" is now turned to a full dependency type list, so you can
make package overwrite files only certain versions of the package
(though, we should probably take this into account already at solution
calculation phase).

Also make 'info --replaces' print the "replaces" of the package.

This is in preparation for the policy package support, which still
requires "replacement priority" field to decide which packages' files
get the preference.

the solver requires this.

Make a loud warning if the script returns failure, but do not
abort installation sequence because of that.

still todo:
  - 'fix' is missing
  - 'del -R' does not work
  - 'upgrade' does not do self-upgrade first

... and a lot of testing.

Make indexer keep noise about errors that prevent index generation.
Detect certain errors in the APKs better. And also have the applet
return error in these scenarios.

Parse these fields from .PKGINFO, and write them to index.

Parse install_if from package metadata and include it in the
indexes. Also setup the reverse install_if dependencies when
loading a database. ref #443.

Actual install_if functionality is not yet implemented.

Just disable installation of packages using the new stuff. Also
flag lower case package info fields as non-critical and allow
installation even if that features is not supported.

When package is installed from commandline, we should always
install that specific instance of package (never favor repository
version if it has difference identity). Otherwise we might not
always end-up installing the .apk given on command line. The
dependency is now against specific checksum identity (marked
with >< dependency comparison). Fixes #492.

.. instead of the longer flag combo.

It's no longer needed or used.

 - implement a hash table for commonly shared fields such as
   license, version and architecture
 - use macroes to print blobs or pkgname-pkgver strings
 - fix some old cruft

Architecture is now:
 - parsed from .PKGINFO
 - written to index and installed db
 - appended to repository URL when fetching files

should not be needed anymore.

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

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

Take the uid/gid from passwd and group.

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.

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

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

get list of overlay files from stdin, so those do not get overwritten.

if the dependencies are empty with only trailing new line, the
parsing was incorrect. fix the new line check.

accept also pkgfile in addition to pkgname. make also the signature
verification stuff work properly again with non-repository files.

this makes the database package entry smaller, and we propbably
get more fields to installed_package later too. this cleans up
the way scripts are stored and is a preparation for supporting
triggers. some parsing for trigger meta-data. ref #45.

some hooks to package verification code were missing causing the
verification to not be done (causing pre-script to be not run).
fixes #124, #126.

it will allow to overwrite files owned by some other packages
to get upgrades right (e.g. when splitting or renaming packages)

this way we never change cwd, and relative filenames are always
parsed consistently. this also helps filename construction in many
places. this patch also changes '--root' to override location of
all configuration to be in the new root. previously it depended
on the file which one was used.

and force checksumming only when unpacking archive. otherwise
it's extra computation for nothing.

this dependency is now inserted automatically by abuild.

when failed to load an existing index.