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Eray Özkural
2005-07-22 15:47:31 +00:00
parent d3c64ad0cf
commit c252d6d2e0
2 changed files with 4 additions and 3 deletions
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@@ -256,8 +256,9 @@ dependency and conflict to change. Therefore, we have a $G_0$ which
represents the current relations (among installed packages) in the represents the current relations (among installed packages) in the
system, and a $G_f$ which is probably taken from a remote package system, and a $G_f$ which is probably taken from a remote package
repository. We begin by noting that $G_0$ and $G_f$ have to be repository. We begin by noting that $G_0$ and $G_f$ have to be
compatible. That is, to say, if a package $(u,v)$ is shared across two compatible. That is, to say, if a package $(p_1,v_1)$ is shared across
times, then the declarations made by the package are one and the same. two graphs, then the declarations made by the package are one and the
same.
$G_0$ can be calculated from the package information (e.g. metadata) $G_0$ can be calculated from the package information (e.g. metadata)
of the installed packages and is stored by PISI in a dedicated of the installed packages and is stored by PISI in a dedicated
@@ -267,7 +268,7 @@ these entities is expensive and we should take care to minimize access
as in the previous section. as in the previous section.
To preserve consistency during individual transitions, the planner can To preserve consistency during individual transitions, the planner can
choose to remove a minimal number of packages from the system to bring choose to remove a minimum number of packages from the system to bring
it to a clean state, and then install the new versions of these it to a clean state, and then install the new versions of these
packages in the correct order. Let us assume that it is indeed packages in the correct order. Let us assume that it is indeed
possible to achieve this ``clean state''. Apparently, this is not possible to achieve this ``clean state''. Apparently, this is not