depends, provides, conflicts, replaces, and other variables that are
meant to contain package names, are now checked to ensure
1) the name component contains only characters that would equate to
a valid pkgname.
2) the version component contains only characters that would equate
to a valid pkgver.
3) comparison operator is a valid comparison operator (e.g. provides
only allows exact = while optdepends doesn't allow anything)
This also refactors pkgname into a shared utility function, wires up
pkgbase optdepends and provides to use it, and gives pkgver a touchup
to allow referencing where it was called from.
Fixes FS#57833 and a bit of extra.
Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>
