func (v VersionRelation) SatisfiedBy(ver version.Version) bool {
vVer, err := version.Parse(v.Number)
if err != nil {
return false
}
q := version.Compare(ver, vVer)
switch v.Operator {
case ">=":
return q >= 0
case "<=":
return q <= 0
case ">>":
return q > 0
case "<<":
return q < 0
case "=":
return q == 0
}
// XXX: WHAT THE SHIT
return false
}
func (can Candidates) ExplainSatisfies(arch dependency.Arch, possi dependency.Possibility) (bool, string, []control.BinaryIndex) {
entries, ok := can[possi.Name]
if !ok { // no known entries in the Index
return false, fmt.Sprintf("Totally unknown package: %s", possi.Name), nil
}
if possi.Arch != nil {
satisfied := false
archEntries := []control.BinaryIndex{}
for _, installable := range entries {
if installable.Architecture.Is(possi.Arch) {
archEntries = append(archEntries, installable)
satisfied = true
}
}
if !satisfied {
return false, fmt.Sprintf(
"Relation depends on multiarch arch %s-%s-%s. Not found",
possi.Arch.ABI,
possi.Arch.OS,
possi.Arch.CPU,
), nil
}
entries = archEntries
}
if possi.Version == nil {
return true, "Relation exists, no version constraint", entries
}
// OK, so we have to play with versions now.
vr := *possi.Version
relatioNumber, _ := version.Parse(vr.Number)
satisfied := false
seenRealtions := []string{}
versionEntries := []control.BinaryIndex{}
for _, installable := range entries {
q := version.Compare(installable.Version, relatioNumber)
seenRealtions = append(seenRealtions, installable.Version.String())
switch vr.Operator {
case ">=":
satisfied = q >= 0
case "<=":
satisfied = q <= 0
case ">>":
satisfied = q > 0
case "<<":
satisfied = q < 0
case "=":
satisfied = q == 0
default:
return false, "Unknown operator D:", nil // XXX: WHAT THE SHIT
}
if satisfied {
versionEntries = append(versionEntries, installable)
}
}
if len(versionEntries) > 0 {
return true, "Relation exists with a satisfied version constraint", versionEntries
}
return false, fmt.Sprintf(
"%s is version constrainted %s %s. Valid options: %s",
possi.Name,
vr.Operator,
vr.Number,
strings.Join(seenRealtions, ", "),
), nil
}