[jhalfs] branch trunk updated: Add dependency thoughts to BLFS/TODO

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The following commit(s) were added to refs/heads/trunk by this push:
     new eec87db  Add dependency thoughts to BLFS/TODO
eec87db is described below

commit eec87dbd1f226a0bf09145862f43b36fd1fde14b
Author: Pierre Labastie <[email protected]>
AuthorDate: Fri Dec 10 18:19:06 2021 +0100

    Add dependency thoughts to BLFS/TODO
---
 BLFS/TODO | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/BLFS/TODO b/BLFS/TODO
index 51207ec..ad11b07 100644
--- a/BLFS/TODO
+++ b/BLFS/TODO
@@ -15,3 +15,26 @@
      the BLFS book should be revised and validated, but our time is limited.
 
 --   Bugs hunting.
+
+--   About dependencies
+     A. A DEPENDENCY MAY NOT BE INSTALLED EVEN IF NEEDED
+     Currently (December 10th, 2021), the dependencies are only installed
+     if either:
+     - (i)  they are not already installed
+     - (ii) their version is higher than the installed version
+     If a dependency is not installed, its dependencies are not considered.
+     But it may happen that a dependency (depB) of a dependency (depA) is in
+     case (i) or (ii) (most likely), but not depA. In this case, depB is
+     not considered, although it might happen that it is needed for the
+     requested package.
+     So the dependency system should be changed to always compute the full
+     dependency chain, and another function should be created to remove
+     packages not in case (i) or (ii) from the list of generated dependencies.
+     B. CHECKING DEPENDENCIES
+     There are several kinds of checks we might want to implement, for
+     example:
+     - (i)   check that a package can be built with only the listed
+             dependencies, and their dependencies (missing dependency)
+     - (ii)  check that the dependencies do not include dependencies
+             that are already in the dependency chain (redundant dependency)
+     - (iii) check that a dependency is really needed (false dependency)

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