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qpkg: light cleanup of prereq.c:resolve and change forgotten in last commit

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- prereq.c (resolve): do not consider installing virtual packages
  (forgotten in previous commit)
- prereq.c (resolve): renamed "next_dep" to "next_deps" to emphasize that
  this is a list
- prereq.c (resolve): use "break" instead of "return" to abandon a
  non-optimal path, so that we'll run future cleanup code
- prereq.c (resolve): fixed typos in explanation of QPKG_ADDING cleanup
- prereq.c (resolve): reference test/bug-adding in explanation
This commit is contained in:
Werner Almesberger 2010-11-22 21:12:23 -03:00
parent c95d064f9e
commit 068264ed61
1 changed files with 12 additions and 9 deletions
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21
qpkg/prereq.c
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@ -166,7 +166,7 @@ static void print_debug(const struct pkg *pkg, const struct stack *top,
}
static void resolve(struct list *next_dep, const struct ref *dep,
static void resolve(struct list *next_deps, const struct ref *dep,
struct stack *top, struct list *conf)
{
static int level = 0;
@ -178,19 +178,21 @@ static void resolve(struct list *next_dep, const struct ref *dep,
struct pkg *pkg;
while (!dep) {
if (!next_dep) {
if (!next_deps) {
done();
return;
}
assert(top->pkg->flags & QPKG_ADDING);
top->pkg->flags &= ~QPKG_ADDING;
top = top->next;
dep = next_dep->refs;
next_dep = next_dep->next;
dep = next_deps->refs;
next_deps = next_deps->next;
}
for (pkg = dep->pkg->jrb->val; pkg; pkg = pkg->more) {
if (best && n_install == n_best)
return;
break;
if (pkg->flags & QPKG_PROVIDED)
continue;
if (debug)
print_debug(pkg, top, level);
if (!satisfies(pkg, dep))
@ -203,7 +205,7 @@ static void resolve(struct list *next_dep, const struct ref *dep,
}
if ((pkg->flags & QPKG_INSTALLED) || pkg->mark) {
assert(!old_conflicts(pkg, conf));
resolve(next_dep, dep->next, top, conf);
resolve(next_deps, dep->next, top, conf);
continue;
}
if (old_conflicts(pkg, conf))
@ -213,7 +215,7 @@ static void resolve(struct list *next_dep, const struct ref *dep,
level++;
append_install(pkg);
more_deps.refs = dep->next;
more_deps.next = next_dep;
more_deps.next = next_deps;
more_conf.refs = pkg->conflicts;
more_conf.next = conf;
stack.pkg = pkg;
@ -225,11 +227,12 @@ static void resolve(struct list *next_dep, const struct ref *dep,
}
/*
* @@@ this shouldn't be all of the story yet. if we fail a dependency
* @@@ this shouldn't be all of the story yet. If we fail a dependency
* due to a conflict, the current algorithm may leave packages marked
* as QPKG_ADDING, possibly triggering a false cyclic dependency error.
* See test/bug-adding for an example.
*
* In the case if cycle detection, we could avoid all the hassle of
* In the case of cycle detection, we could avoid all the hassle of
* maintaining this flag and just walk down the stack to see if we're
* already trying to add the package (the stack should be correct with
* the current algorithm), but we'll need this kind of accurate