public async Task FetchAsync(CancellationToken cancellationToken = default)
{
using var _ = await FileLock
.LockAsync(TargetPath + ".lock", cancellationToken)
.ConfigureAwait(false);
async Task TryAsync()
{
var git = GitCmdFactory.Invoke();
git.ResultValidation = CommandResultValidation.ZeroExitCode;
var gitFolder = TargetPath & ".git";
if (!Directory.Exists(gitFolder))
{
if (!Directory.Exists(TargetPath))
{
Directory.CreateDirectory(TargetPath);
}
git.WorkingDirectory = ""; // It has to be non-target path on cloning
await git
.RunAsync("clone" + CliString.Quote(SourceUrl) + CliString.Quote(TargetPath), cancellationToken)
.ConfigureAwait(false);
git.WorkingDirectory = TargetPath;
await git
.RunAsync("checkout" + new CliString(SourceRevision), cancellationToken)
.ConfigureAwait(false);
}
else
{
git.WorkingDirectory = TargetPath;
var mustFetch = AlwaysFetch;
if (!AlwaysFetch)
{
using (git.ChangeResultValidation(0)) {
var r = await git
.RunAsync("rev-parse --short=10 HEAD", cancellationToken)
.ConfigureAwait(false);
mustFetch |= r.ExitCode != 0;
mustFetch |= r.StandardOutput.Trim() != SourceRevision;
}
}
if (mustFetch)
{
await git
.RunAsync("reset --hard HEAD", cancellationToken)
.ConfigureAwait(false);
await git
.RunAsync("fetch origin", cancellationToken)
.ConfigureAwait(false);
await git
.RunAsync("checkout" + new CliString(SourceRevision), cancellationToken)
.ConfigureAwait(false);
}
}
}
try {
await TryAsync().ConfigureAwait(false);
}
catch (CommandExecutionException e) {
if (!e.Message.Contains("non-zero exit code"))
{
throw;
}
Directory.Delete(TargetPath, true);
await TryAsync().ConfigureAwait(false);
}
}
