/// <summary>
/// 'git ref-log' doesn't work if the repo is corrupted, so parsing reflogs seems like the only solution.
/// </summary>
/// <param name="fullSymbolicRef">A full symbolic ref name. eg. HEAD, refs/remotes/origin/HEAD, refs/heads/master</param>
private static bool TryReadLastRefLogEntry(Enlistment enlistment, string fullSymbolicRef, out RefLogEntry refLog, out string error)
{
string refLogPath = Path.Combine(enlistment.WorkingDirectoryRoot, GVFSConstants.DotGit.Logs.Root, fullSymbolicRef);
if (!File.Exists(refLogPath))
{
refLog = null;
error = "Could not find reflog for ref '" + fullSymbolicRef + "'";
return(false);
}
try
{
string refLogContents = File.ReadLines(refLogPath).Last();
if (!RefLogEntry.TryParse(refLogContents, out refLog))
{
error = "Last ref log entry for " + fullSymbolicRef + " is unparsable.";
return(false);
}
}
catch (IOException ex)
{
refLog = null;
error = "IOException while reading reflog '" + refLogPath + "': " + ex.Message;
return(false);
}
error = null;
return(true);
}
public static bool TryParse(string line, out RefLogEntry entry)
{
entry = null;
if (string.IsNullOrEmpty(line))
{
return(false);
}
if (line.Length < ScalarConstants.ShaStringLength + 1 + ScalarConstants.ShaStringLength)
{
return(false);
}
string sourceSha = line.Substring(0, ScalarConstants.ShaStringLength);
string targetSha = line.Substring(ScalarConstants.ShaStringLength + 1, ScalarConstants.ShaStringLength);
int reasonStart = line.LastIndexOf("\t");
if (reasonStart < 0)
{
return(false);
}
string reason = line.Substring(reasonStart + 1);
entry = new RefLogEntry(sourceSha, targetSha, reason);
return(true);
}
public void FailsForNull()
{
string testLine = null;
RefLogEntry output;
RefLogEntry.TryParse(testLine, out output).ShouldEqual(false);
output.ShouldBeNull();
}
public void FailsForMissingTargetSha()
{
const string SourceSha = "0000000000000000000000000000000000000000";
string testLine = string.Format("{0} ", SourceSha);
RefLogEntry output;
RefLogEntry.TryParse(testLine, out output).ShouldEqual(false);
output.ShouldBeNull();
}
public void FailsForMissingReason()
{
const string SourceSha = "0000000000000000000000000000000000000000";
const string TargetSha = "d249e0fea84484eb105d52174cf326958ee87ab4";
string testLine = string.Format("{0} {1} author <*****@*****.**> 1478738341 -0800", SourceSha, TargetSha);
RefLogEntry output;
RefLogEntry.TryParse(testLine, out output).ShouldEqual(false);
output.ShouldBeNull();
}
public void ParsesValidRefLog()
{
const string SourceSha = "0000000000000000000000000000000000000000";
const string TargetSha = "d249e0fea84484eb105d52174cf326958ee87ab4";
const string Reason = "clone: from https://repourl";
string testLine = string.Format("{0} {1} author <*****@*****.**> 1478738341 -0800\t{2}", SourceSha, TargetSha, Reason);
RefLogEntry output;
RefLogEntry.TryParse(testLine, out output).ShouldEqual(true);
output.ShouldNotBeNull();
output.SourceSha.ShouldEqual(SourceSha);
output.TargetSha.ShouldEqual(TargetSha);
output.Reason.ShouldEqual(Reason);
}
