public override IEnumerable <SnapshotItem> GetSnapshotItems(SnapshotId snapshotId)
{
var commit = CommitFromSnapshotId(snapshotId);
var tstamp = commit.Author.When;
return(FromTree("", commit.Tree, ignored => tstamp));
}
virtual public void UpdateDirectoryFromSnapshot(SnapshotId currentId, SnapshotId targetId, DirectoryInfo dirRoot)
{
if (currentId.Equals(targetId))
{
return;
}
PopulateDirectoryFromSnapshot(targetId, dirRoot);
ProcessDeletionsBetweenSnapshot(currentId, targetId, dirRoot);
}
public override SnapshotId GetPreviousSnapshotId(SnapshotId snapshotId)
{
var commit = CommitFromSnapshotId(snapshotId);
if (commit != null)
{
var previousCommit = GetPreviousCommit(commit);
if (previousCommit != null)
{
return(new GitCommitId(previousCommit.Id));
}
}
return(null);
}
/// <summary>
/// List snapshots between first id and last id inclusive.
/// </summary>
/// <param name="firstId">A more recently created snapshot.</param>
/// <param name="lastId">An id older than first Id</param>
/// <returns>Empty set on error</returns>
virtual public IEnumerable <SnapshotInfo> ListSnapshotsBetween(SnapshotId firstId, SnapshotId lastId)
{
List <SnapshotInfo> ret = new List <SnapshotInfo>();
var curr = GetLatestSnapshotId();
while (curr != null && !curr.Equals(firstId))
{
curr = GetPreviousSnapshotId(curr);
}
// ran out of ids
if (curr == null)
{
LogEvent.SnapshotIdNotFound(firstId);
// on error case return an empty enumeration.
ret.Clear();
return(ret);
}
else
{
// add first id
ret.Add(GetSnapshotInfo(curr));
}
// if first is equal to last we are done.
if (firstId.Equals(lastId))
{
return(ret);
}
// keep adding till we hit last.
while (curr != null && !curr.Equals(lastId))
{
ret.Add(GetSnapshotInfo(curr));
curr = GetPreviousSnapshotId(curr);
}
// ran out of ids.
if (curr == null)
{
LogEvent.SnapshotIdNotFound(lastId);
// on error case return an empty enumeration.
ret.Clear();
return(ret);
}
else
{
// add last id
ret.Add(GetSnapshotInfo(curr));
}
return(ret);
}
virtual public IEnumerable <SnapshotItem> GetDeletedItemsBetweenSnapshots(SnapshotId currentId, SnapshotId targetId)
{
//TODO: Allow for case sensitive compare if we ever port to Linux
HashSet <string> newPaths = new HashSet <string>(StringComparer.OrdinalIgnoreCase);
foreach (var item in GetSnapshotItems(targetId))
{
newPaths.Add(item.RelativePath);
}
foreach (var item in GetSnapshotItems(currentId))
{
if (!newPaths.Contains(item.RelativePath))
{
// this is missing in the newer snapshot, so it is a deletion.
yield return(item);
}
}
}
/// <summary>
/// Copies files from snapshot to dirRoot.
/// </summary>
/// <param name="snapshotId">The snapshot id</param>
/// <param name="dirRoot">Root to extract</param>
/// <remarks>
/// Doesn't delete any data, only adds or modifies data under dirRoot.
/// </remarks>
virtual public void PopulateDirectoryFromSnapshot(SnapshotId snapshotId, DirectoryInfo dirRoot)
{
if (snapshotId == null)
{
throw new ArgumentNullException("snapshotId");
}
if (dirRoot == null)
{
throw new ArgumentNullException("dirRoot");
}
var snapshotItems = GetSnapshotItems(snapshotId);
Parallel.ForEach(snapshotItems, item =>
{
var fullPath = SafeCombinePath(dirRoot, item.RelativePath);
if (fullPath == null)
{
LogEvent.UpdateOfItemSkipedBecauseOfError(item.RelativePath);
}
else
{
try
{
var itemDir = Path.GetDirectoryName(fullPath);
Directory.CreateDirectory(itemDir);
using (FileStream fs = new FileStream(fullPath, FileMode.Create))
{
item.ReadContent(content =>
{
content.CopyTo(fs);
content.Close();
});
fs.Close();
}
File.SetLastWriteTimeUtc(fullPath, item.LastModifiedTime.UtcDateTime);
LogEvent.ExtractedSnapshotContentTo(fullPath, item.Size, item.LastModifiedTime);
}
catch (Exception ex)
{
LogEvent.UnexpectedExceptionDuringPopulate(fullPath, ex);
}
}
});
}
virtual public void ProcessDeletionsBetweenSnapshot(SnapshotId currentId, SnapshotId targetId, DirectoryInfo dirRoot)
{
if (currentId.Equals(targetId))
{
return;
}
var deletions = GetDeletedItemsBetweenSnapshots(currentId, targetId);
foreach (var item in deletions)
{
var fullPath = SafeCombinePath(dirRoot, item.RelativePath);
if (fullPath == null)
{
LogEvent.DeleteOfItemSkipedBecauseOfError(item.RelativePath);
}
else
{
TryDeleteFile(fullPath);
}
}
}
abstract public IEnumerable <SnapshotItem> GetSnapshotItems(SnapshotId token);
abstract public SnapshotInfo GetSnapshotInfo(SnapshotId snapshotId);
abstract public SnapshotId GetPreviousSnapshotId(SnapshotId snapshotId);
virtual public IEnumerable <SnapshotItem> GetAddedItemsBetweenSnapshots(SnapshotId currentId, SnapshotId targetId)
{
// just swap the order to get additions.
return(GetDeletedItemsBetweenSnapshots(targetId, currentId));
}
private Commit CommitFromSnapshotId(SnapshotId id)
{
var gitCommitId = (GitCommitId)id;
return((Commit)GitRepo.Lookup(gitCommitId.CommitId, ObjectType.Commit));
}
public void ResetWorkingDirectoryTo(SnapshotId id)
{
var commit = CommitFromSnapshotId(id);
GitRepo.Reset(ResetOptions.Hard, commit.Sha);
}
public override SnapshotInfo GetSnapshotInfo(SnapshotId snapshotId)
{
var commit = CommitFromSnapshotId(snapshotId);
return(new SnapshotInfo(commit.Message, commit.Author.When, snapshotId));
}
public SnapshotInfo(string comment, DateTimeOffset time, SnapshotId snapshotId)
{
Comment = comment;
Time = time;
SnapshotId = snapshotId;
}
