public IEnumerable <PackageIdentity> GetPackagesToRemove(IEnumerable <JournalEntry> journalEntries)
{
if (!fileSystem.GetDiskFreeSpace(packageUtils.RootDirectory, out var totalNumberOfFreeBytes) || !fileSystem.GetDiskTotalSpace(packageUtils.RootDirectory, out var totalNumberOfBytes))
{
log.Info("Unable to determine disk space. Skipping free space package retention.");
return(new PackageIdentity[0]);
}
var percentFreeDiskSpaceDesired = variables.GetInt32(PackageRetentionPercentFreeDiskSpace) ?? DefaultPercentFreeDiskSpace;
var desiredSpaceInBytes = totalNumberOfBytes * (ulong)percentFreeDiskSpaceDesired / 100;
if (totalNumberOfFreeBytes > desiredSpaceInBytes)
{
log.VerboseFormat("Detected enough space for new packages. ({0}/{1})", totalNumberOfFreeBytes.ToFileSizeString(), totalNumberOfBytes.ToFileSizeString());
return(new PackageIdentity[0]);
}
var spaceToFree = (desiredSpaceInBytes - totalNumberOfFreeBytes) * (100 + FreeSpacePercentBuffer) / 100;
log.VerboseFormat("Cleaning {0} space from the package cache.", spaceToFree.ToFileSizeString());
ulong spaceFreed = 0L;
var orderedJournalEntries = sortJournalEntries.Sort(journalEntries);
return(orderedJournalEntries.TakeWhile(entry =>
{
var moreToClean = spaceFreed < spaceToFree;
spaceFreed += entry.FileSizeBytes;
return moreToClean;
})
.Select(entry => entry.Package));
}