public override string GetVersion()
{
// Get the commit at which the version number changed, and calculate the git height
this.logger.LogInformation("Determining the version based on '{versionPath}' in repository '{repositoryPath}'", this.versionPath, this.gitRepository.GitDirectory);
var version = VersionFile.GetVersion(Path.Combine(gitRepository.RootDirectory, this.versionPath));
this.logger.LogInformation("The current version is '{version}'", version);
var pathComponents = GetPathComponents(this.versionPath);
var headCommit = gitRepository.GetHeadCommit();
var commit = headCommit;
Stack <GitCommit> commitsToAnalyze = new Stack <GitCommit>();
commitsToAnalyze.Push(commit);
while (commitsToAnalyze.Count > 0)
{
// Analyze the current commit
this.logger.LogDebug("Analyzing commit '{sha}'. '{commitCount}' commits to analyze.", commit.Sha, commitsToAnalyze.Count);
commit = commitsToAnalyze.Peek();
if (knownGitHeights.ContainsKey(commit.Sha))
{
// The same commit can be pushed to the stack if two other commits had the same parent.
commitsToAnalyze.Pop();
continue;
}
// If this commit has a version.json file which is semantically different from the current version.json, the git height
// of this commit is 1.
var treeId = commit.Tree;
bool versionChanged = false;
for (int i = 0; i <= pathComponents.Length; i++)
{
if (treeId == GitObjectId.Empty)
{
// A version.json file was added in this revision
this.logger.LogDebug("The component '{pathComponent}' could not be found in this commit. Assuming the version.json file was not present.", i == pathComponents.Length ? Array.Empty <byte>() : pathComponents[i]);
versionChanged = true;
break;
}
if (knownTreeIds.Contains(treeId))
{
// Nothing changed, no need to recurse.
this.logger.LogDebug("The tree ID did not change in this commit. Not inspecting the contents of the tree.");
break;
}
knownTreeIds.Add(treeId);
if (i == pathComponents.Length)
{
// Read the updated version information
using (Stream versionStream = gitRepository.GetObjectBySha(treeId, "blob"))
{
var currentVersion = VersionFile.GetVersion(versionStream);
this.logger.LogDebug("The version for this commit is '{version}'", currentVersion);
versionChanged = currentVersion != version;
if (versionChanged)
{
this.logger.LogInformation("The version number changed from '{version}' to '{currentVersion}' in commit '{commit}'. Using this commit as the baseline.", version, currentVersion, commit.Sha);
}
}
}
else
{
treeId = gitRepository.GetTreeEntry(treeId, pathComponents[i]);
this.logger.LogDebug("The tree ID for '{pathComponent}' is '{treeId}'", pathComponents[i], treeId);
}
}
if (versionChanged)
{
this.knownGitHeights.Add(commit.Sha, 0);
var poppedCommit = commitsToAnalyze.Pop();
Debug.Assert(poppedCommit == commit);
}
else
{
bool hasParentWithUnknownGitHeight = false;
int currentHeight = -1;
foreach (var parent in commit.Parents)
{
if (knownGitHeights.ContainsKey(parent))
{
var parentHeight = knownGitHeights[parent];
if (parentHeight > currentHeight)
{
currentHeight = parentHeight + 1;
}
}
else
{
commitsToAnalyze.Push(this.gitRepository.GetCommit(parent));
hasParentWithUnknownGitHeight = true;
}
}
if (!hasParentWithUnknownGitHeight)
{
// The current height of this commit is exact.
this.knownGitHeights.Add(commit.Sha, currentHeight);
var poppedCommit = commitsToAnalyze.Pop();
Debug.Assert(poppedCommit == commit);
}
}
}
var gitHeight = this.knownGitHeights[headCommit.Sha];
return(GetVersion(version, gitHeight));
}
public string GetVersion()
{
// Get the commit at which the version number changed, and calculate the git height
this.logger.LogInformation("Determining the version based on '{versionPath}' in repository '{repositoryPath}'", this.versionPath, this.gitRepository.GitDirectory);
var version = VersionFile.GetVersion(Path.Combine(gitRepository.RootDirectory, this.versionPath));
this.logger.LogInformation("The current version is '{version}'", version);
var pathComponents = GetPathComponents(this.versionPath);
var commit = gitRepository.GetHeadCommit();
string[] treeIds = new string[pathComponents.Length];
int gitHeight = 0;
bool versionUpdated = false;
while (!versionUpdated)
{
this.logger.LogDebug("Analyzing commit '{sha}'. Current git height is '{gitHeight}'", commit.Sha, gitHeight);
gitHeight += 1;
var treeId = commit.Tree;
for (int i = 0; i < pathComponents.Length; i++)
{
treeId = gitRepository.GetTreeEntry(treeId, pathComponents[i]);
this.logger.LogDebug("The tree ID for '{pathComponent}' is '{treeId}'", pathComponents[i], treeId);
if (treeIds[i] == treeId)
{
// Nothing changed, no need to recurse.
this.logger.LogDebug("The tree ID did not change in this commit. Not inspecting the contents of the tree.");
break;
}
treeIds[i] = treeId;
if (i == pathComponents.Length - 1)
{
// Read the updated version information
using (Stream versionStream = gitRepository.GetObjectBySha(treeId, "blob"))
{
var currentVersion = VersionFile.GetVersion(versionStream);
this.logger.LogDebug("The version for this commit is '{version}'", currentVersion);
versionUpdated = currentVersion != version;
if (versionUpdated)
{
this.logger.LogInformation("The version number changed from '{version}' to '{currentVersion}' in commit '{commit}'. Using this commit as the baseline.", version, currentVersion, commit.Sha);
}
}
}
}
commit = gitRepository.GetCommit(commit.Parent);
}
return($"{version}.{gitHeight}");
}