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Ciaran McCreesh wrote:
| I'm rewording the PMS sections on dependencies to avoid permitting
| overly lax circular dependency resolution. Which of these wordings is
| accurate, given that usable means "has its RDEPENDs installed and
| usable"?
|
| 1. During pkg_preinst and pkg_postinst, any package dependency that is
| in both DEPEND and RDEPEND must be installed and usable.
|
| 2. During pkg_preinst and pkg_postinst, at least one of the following
| conditions must be met:
| a. every package dependency in DEPEND must be installed and usable
| b. every package dependency in RDEPEND must be installed and usable
|
| Do not attempt to write on both sides of the paper at once.
Every package dependency in DEPEND is installed and usable before src_unpack
starts,
right? So is the question here whether or not they can be uninstalled right
before
pkg_{pre,post}inst starts?
I don't know what the general use of pkg_preinst is, but in pkg_postinst the
package
itself should be runnable, so its RDEPENDS should be installed and usable at
this point.
So perhaps we should define that "usable" means "each of its RDEPENDs is
installed and has
had its pkg_postinst function run". The recursion of that definition then comes
from the
requirement that RDEPENDs should be usable before pkg_postinst starts running.
| For why this matters:
|
| cat/a-1: RDEPEND cat/b
| cat/b-1: RDEPEND cat/a
|
| This is solvable. If package managers can't solve this, they can't
| install Gnome off a stage 3...
If only one of those packages has a pkg_postinst then it is still solvable.
If they both have a pkg_postinst then one of those is probably not essential
for the
actual usability of the package and should be removed. A final possibility is
that the
pkg_postinsts are both necessary for a fully functional package but not for the
functionality used in the other pkg_postinst. If this is the case, then perhaps
we should
specify deps according to which ebuild phase they are necessary for?
cat/a:
SRC_UNPACK_DEP="app-arch/unzip"
SRC_COMPILE_DEP="dev-scheme/bigloo"
SRC_INSTALL_DEP=""
PKG_PREINST_DEP=""
PKG_POSTINST_DEP="cat/b"
RDEPEND="cat/b"
and then cat/b would say:
PKG_PREINST_DEP=""
PKG_POSTINST_DEP=""
RDEPEND="cat/a"
Marijn
- --
Marijn Schouten (hkBst), Gentoo Lisp project, Gentoo ML
<http://www.gentoo.org/proj/en/lisp/>, #gentoo-{lisp,ml} on FreeNode
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