Dependency Types

[em1lyy]

kawa should support required/optional/recommended dependencies.

Many package managers accomplish this by creating multiple fields for certain requirement levels.

kawa will implement a way that is more like Gentoo's USE-Flags:
DEPENDS=req:glibc req:libcurl rec:tar rec:xz rec:gzip opt:bash

Every package name in DEPENDS has a preceding requirement type + :
Required is req, Recommended is rec, Optional is opt and for building Documentation is doc. (Or maybe not, we'll see if we'll add separate *-doc packages (probably))

Kawa's config.h will include a list of dependency types that will be selected by default. These settings can be changed by the --no-type, -Ntype, --use-type and -Utype command-line options.

[em1lyy]

Addition: This allows packagers to maintain more dependency types, for example optional X11 support (for example for vim) would get the dependency type x11: or xorg: or something

[em1lyy]

Addition: Packages of course know what dependency types they're installed with, kawa will maintain a Dependencies file to keep track of all dependency types. This will also allow keeping custom dependency types after updates etc.

[em1lyy]

to keep compatibility, all dependencies that are not prefixed are marked as required.

[em1lyy]

now that the only things really missing (apart from this of course) are patch pkgs and errno handling, I'll probably start work on this very soon

[em1lyy]

To make things exponentially easier, I'll just say that dependency type tags MUST be 3 chars long. This can change in a future kawa version, so don't rely on 3 char dependency types being a requirement.

[em1lyy]

or wait, how about we make it 1-4 chars, yeah, that sounds good
then we can put the chars into an unsigned int and pass an int array, because comparing one int is probably faster that comparing up to four chars

[em1lyy]

checklist:

• pass deptypes to resolve_recursive
• check deptype in resolve_recursive
• fetch custom deptypes in update_all
• pair deptypes with configurecmd
• command line options -N && -U