OPC # 0006: OPC Git Trunk-Based management

Co-authored-by: Copilot <copilot@github.com>
This commit is contained in:
amadzarak
2026-04-26 00:26:56 -04:00
parent 885ad47abe
commit db025cce01
7 changed files with 1238 additions and 349 deletions
+437 -140
View File
@@ -1,22 +1,25 @@
using ControlPlane.Core.Models;
using LibGit2Sharp;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using System.Diagnostics;
using System.Text.Json;
namespace ControlPlane.Api.Services;
/// <summary>
/// Handles all git operations for the promotion workflow:
/// branch status, diff summaries, merge + push, and promotion history persistence.
/// All git commands run against the repo root configured in Docker:RepoRoot.
/// Handles all git operations for the promotion workflow using LibGit2Sharp.
/// No git.exe subprocess is ever spawned — all operations run through the managed
/// LibGit2Sharp API against the server's authoritative repository clone.
/// HEAD is never mutated; merges are performed directly on the object database
/// so the working tree always reflects the develop branch.
/// </summary>
public class PromotionService(IConfiguration config, ILogger<PromotionService> logger)
{
// The ordered promotion ladder — each step is a valid promotion.
public static readonly string[] Ladder = ["develop", "staging", "uat", "master"];
// The ordered promotion ladder — develop is trunk, main is production.
public static readonly string[] Ladder = ["develop", "staging", "uat", "main"];
private string RepoRoot => config["Docker:RepoRoot"] ?? string.Empty;
private string GetRepoPath(string repoName) =>
config[$"Git:Repos:{repoName}"] ?? string.Empty;
private static readonly SemaphoreSlim _lock = new(1, 1);
private static readonly JsonSerializerOptions JsonOpts = new()
@@ -26,67 +29,116 @@ public class PromotionService(IConfiguration config, ILogger<PromotionService> l
Converters = { new System.Text.Json.Serialization.JsonStringEnumConverter() },
};
// ── Credentials ──────────────────────────────────────────────────────────
private FetchOptions MakeFetchOptions() => new()
{
CredentialsProvider = (_, _, _) => new UsernamePasswordCredentials
{
Username = config["Gitea:Owner"] ?? "git",
Password = config["Gitea:Token"] ?? string.Empty,
},
};
private PushOptions MakePushOptions() => new()
{
CredentialsProvider = (_, _, _) => new UsernamePasswordCredentials
{
Username = config["Gitea:Owner"] ?? "git",
Password = config["Gitea:Token"] ?? string.Empty,
},
};
private static Signature MakeSig() =>
new("OPC Control Plane", "opc@clarity.internal", DateTimeOffset.UtcNow);
// ── Branch status ────────────────────────────────────────────────────────
/// <summary>
/// Returns status for all ladder branches: last commit info + ahead/behind counts vs next branch.
/// Runs on a thread-pool thread because LibGit2Sharp network operations are synchronous.
/// </summary>
public async Task<List<BranchStatus>> GetLadderStatusAsync(CancellationToken ct = default)
public Task<List<BranchStatus>> GetLadderStatusAsync(string repoName = "Clarity", CancellationToken ct = default) =>
Task.Run(() => GetLadderStatusCore(repoName, ct), ct);
private List<BranchStatus> GetLadderStatusCore(string repoName, CancellationToken ct)
{
var repoPath = GetRepoPath(repoName);
if (string.IsNullOrWhiteSpace(repoPath) || !Directory.Exists(repoPath))
return Ladder.Select(b => new BranchStatus(b, false, null, null, 0, 0, [])).ToList();
using var repo = new Repository(repoPath);
// Fetch to get up-to-date remote refs; swallow network errors so status still works offline.
try
{
var remote = repo.Network.Remotes["origin"];
if (remote is not null)
{
var refSpecs = remote.FetchRefSpecs.Select(r => r.Specification).ToList();
repo.Network.Fetch(remote.Name, refSpecs, MakeFetchOptions());
}
}
catch (Exception ex)
{
logger.LogWarning(ex, "Fetch during ladder status failed — continuing with cached refs");
}
var result = new List<BranchStatus>();
// Fetch to get up-to-date remote state, but don't fail if we're offline
await RunGitAsync("fetch --all --quiet", ct, swallowErrors: true);
foreach (var branch in Ladder)
for (var i = 0; i < Ladder.Length; i++)
{
var exists = await BranchExistsAsync(branch, ct);
if (!exists)
ct.ThrowIfCancellationRequested();
var branchName = Ladder[i];
var branch = repo.Branches[branchName];
if (branch?.Tip is null)
{
result.Add(new BranchStatus(branch, false, null, null, 0, 0, []));
result.Add(new BranchStatus(branchName, false, null, null, 0, 0, []));
continue;
}
// Last commit on this branch
var lastCommit = await GitOutputAsync($"log {branch} -1 --format=%h|%an|%ad|%s --date=short", ct);
string? shortHash = null, author = null, date = null, subject = null;
if (!string.IsNullOrWhiteSpace(lastCommit))
{
var p = lastCommit.Trim().Split('|', 4);
if (p.Length == 4) (shortHash, author, date, subject) = (p[0], p[1], p[2], p[3]);
}
var tip = branch.Tip;
var when = tip.Author.When;
var summary = $"{tip.Author.Name} · {when:yyyy-MM-dd} · {tip.MessageShort}";
// Ahead/behind vs the NEXT branch in the ladder
int ahead = 0, behind = 0;
var nextIdx = Array.IndexOf(Ladder, branch) + 1;
if (nextIdx < Ladder.Length)
// Ahead/behind vs the next branch in the ladder
int ahead = 0;
int behind = 0;
CommitInfo[] unreleasedCommits = [];
if (i + 1 < Ladder.Length)
{
var next = Ladder[nextIdx];
if (await BranchExistsAsync(next, ct))
var nextBranch = repo.Branches[Ladder[i + 1]];
if (nextBranch?.Tip is not null)
{
var counts = await GitOutputAsync($"rev-list --left-right --count {next}...{branch}", ct);
if (!string.IsNullOrWhiteSpace(counts))
var div = repo.ObjectDatabase.CalculateHistoryDivergence(tip, nextBranch.Tip);
ahead = div.AheadBy ?? 0;
behind = div.BehindBy ?? 0;
if (ahead > 0)
{
var parts = counts.Trim().Split('\t');
if (parts.Length == 2)
{
int.TryParse(parts[0], out behind);
int.TryParse(parts[1], out ahead);
}
unreleasedCommits = repo.Commits
.QueryBy(new CommitFilter
{
IncludeReachableFrom = tip,
ExcludeReachableFrom = nextBranch.Tip,
SortBy = CommitSortStrategies.Topological | CommitSortStrategies.Time,
})
.Select(c => new CommitInfo(
c.Sha,
c.Sha[..7],
c.MessageShort,
c.Author.Name,
c.Author.When.ToString("yyyy-MM-dd")))
.ToArray();
}
}
}
// Unreleased commit summaries (commits in this branch not yet in next)
string[] unreleasedLines = [];
if (ahead > 0 && nextIdx < Ladder.Length && await BranchExistsAsync(Ladder[nextIdx], ct))
{
var log = await GitOutputAsync($"log {Ladder[nextIdx]}..{branch} --oneline --no-decorate", ct);
unreleasedLines = log.Split('\n', StringSplitOptions.RemoveEmptyEntries);
}
result.Add(new BranchStatus(branch, true, shortHash, $"{author} · {date} · {subject}",
ahead, behind, unreleasedLines));
result.Add(new BranchStatus(branchName, true, tip.Sha[..7], summary,
ahead, behind, unreleasedCommits));
}
return result;
@@ -96,7 +148,8 @@ public class PromotionService(IConfiguration config, ILogger<PromotionService> l
/// <summary>
/// Merges <paramref name="from"/> into <paramref name="to"/> with a no-fast-forward merge commit,
/// then pushes. Streams progress lines to <paramref name="onLine"/>.
/// then pushes. HEAD is never mutated — the working tree stays on develop throughout.
/// Streams progress lines to <paramref name="onLine"/>.
/// </summary>
public async Task<PromotionRequest> PromoteAsync(
string from,
@@ -104,7 +157,8 @@ public class PromotionService(IConfiguration config, ILogger<PromotionService> l
string requestedBy,
string? note,
Action<string> onLine,
CancellationToken ct)
CancellationToken ct,
string repoName = "Clarity")
{
if (!await _lock.WaitAsync(TimeSpan.Zero, ct))
{
@@ -126,57 +180,13 @@ public class PromotionService(IConfiguration config, ILogger<PromotionService> l
try
{
Log($"▶ Promoting {from} → {to}");
if (!string.IsNullOrWhiteSpace(note)) Log($" Note: {note}");
Log("──────────────────────────────────────");
// 1. Fetch latest
Log(" git fetch --all");
await RunGitAsync("fetch --all --quiet", ct);
// 2. Checkout target branch
Log($" git checkout {to}");
await RunGitAsync($"checkout {to}", ct);
// 3. Pull target to latest
Log($" git pull origin {to}");
await RunGitAsync($"pull origin {to} --quiet", ct);
// 4. Count commits being promoted
var logOutput = await GitOutputAsync($"log {to}..{from} --oneline --no-decorate", ct);
var commitLines = logOutput.Split('\n', StringSplitOptions.RemoveEmptyEntries);
req.CommitCount = commitLines.Length;
req.CommitLines = commitLines;
Log($" Merging {commitLines.Length} commit(s) from {from}:");
foreach (var cl in commitLines) Log($" {cl}");
// 5. Merge with --no-ff for a clean promotion commit
var mergeMsg = $"chore: promote {from} → {to}" + (note != null ? $" — {note}" : "");
Log($" git merge --no-ff {from}");
await RunGitAsync($"merge --no-ff {from} -m \"{mergeMsg}\"", ct);
// 6. Push
Log($" git push origin {to}");
await RunGitAsync($"push origin {to}", ct);
// 7. Return to develop so the working tree stays clean
await RunGitAsync("checkout develop", ct, swallowErrors: true);
Log("──────────────────────────────────────");
Log($"✔ {from} → {to} promoted successfully at {DateTimeOffset.UtcNow:u}");
req.Status = PromotionStatus.Succeeded;
req.CompletedAt = DateTimeOffset.UtcNow;
await Task.Run(() => PromoteCore(from, to, note, repoName, req, Log, ct), ct);
}
catch (Exception ex)
{
Log($"✖ Promotion failed: {ex.Message}");
req.Status = PromotionStatus.Failed;
req.CompletedAt = DateTimeOffset.UtcNow;
// Try to abort any broken merge state
await RunGitAsync("merge --abort", ct, swallowErrors: true);
await RunGitAsync("checkout develop", ct, swallowErrors: true);
logger.LogError(ex, "Promotion {From}→{To} failed", from, to);
}
finally
@@ -188,6 +198,329 @@ public class PromotionService(IConfiguration config, ILogger<PromotionService> l
return req;
}
private void PromoteCore(
string from,
string to,
string? note,
string repoName,
PromotionRequest req,
Action<string> Log,
CancellationToken ct)
{
Log($"▶ Promoting {from} → {to} [{repoName}]");
if (!string.IsNullOrWhiteSpace(note)) Log($" Note: {note}");
Log("──────────────────────────────────────");
using var repo = new Repository(GetRepoPath(repoName));
// 1. Fetch latest remote state for all branches
Log(" Fetching origin...");
var remote = repo.Network.Remotes["origin"]
?? throw new InvalidOperationException("No 'origin' remote configured.");
var refSpecs = remote.FetchRefSpecs.Select(r => r.Specification).ToList();
repo.Network.Fetch(remote.Name, refSpecs, MakeFetchOptions());
// 2. Resolve local branches
var fromBranch = repo.Branches[from]
?? throw new InvalidOperationException($"Branch '{from}' not found.");
var toBranch = repo.Branches[to]
?? throw new InvalidOperationException($"Branch '{to}' not found.");
// 3. Fast-forward local `to` to its remote tracking branch (equivalent to git pull --ff-only)
var remoteTracking = repo.Branches[$"origin/{to}"];
if (remoteTracking?.Tip is not null && toBranch.Tip.Sha != remoteTracking.Tip.Sha)
{
Log($" Fast-forwarding {to} to origin/{to}...");
repo.Refs.UpdateTarget(toBranch.Reference.CanonicalName, remoteTracking.Tip.Sha);
toBranch = repo.Branches[to]!; // refresh after update
}
ct.ThrowIfCancellationRequested();
var fromTip = fromBranch.Tip;
var toTip = toBranch.Tip;
// 4. Enumerate commits being promoted
var pendingCommits = repo.Commits.QueryBy(new CommitFilter
{
IncludeReachableFrom = fromTip,
ExcludeReachableFrom = toTip,
SortBy = CommitSortStrategies.Topological | CommitSortStrategies.Time,
}).ToList();
if (pendingCommits.Count == 0)
{
Log($" {to} is already up-to-date with {from}. Nothing to promote.");
req.Status = PromotionStatus.Succeeded;
req.CommitCount = 0;
req.CommitLines = [];
req.CompletedAt = DateTimeOffset.UtcNow;
return;
}
req.CommitCount = pendingCommits.Count;
req.CommitLines = pendingCommits.Select(c => $"{c.Sha[..7]} {c.MessageShort}").ToArray();
Log($" {pendingCommits.Count} commit(s) to promote:");
foreach (var cl in req.CommitLines) Log($" {cl}");
ct.ThrowIfCancellationRequested();
// 5. Safety check: `from` must be a descendant of `to` (fast-forward is only possible
// when the target branch has no commits that aren't already reachable from source).
// This is the TBD invariant — staging/uat/main are always subsets of develop's linear history.
var isAncestor = repo.ObjectDatabase.FindMergeBase(fromTip, toTip)?.Sha == toTip.Sha;
if (!isAncestor)
{
throw new InvalidOperationException(
$"'{to}' has commits not in '{from}' — fast-forward is not possible. " +
$"This means '{to}' diverged from trunk. " +
$"Check whether a hotfix was committed directly to '{to}' without being backported to '{from}'.");
}
// 6. Fast-forward: advance the local `to` ref to `from`'s tip — no merge commit, linear history.
// Equivalent to: git push origin {from}:{to}
// HEAD is never mutated, working tree is untouched.
var oldToSha = toTip.Sha;
repo.Refs.UpdateTarget(toBranch.Reference.CanonicalName, fromTip.Sha);
Log($" Fast-forward: refs/heads/{to} {oldToSha[..7]} → {fromTip.Sha[..7]}");
ct.ThrowIfCancellationRequested();
// 7. Push to origin; roll back the local ref if push fails so nothing is left half-done
Log($" Pushing {to} to origin...");
try
{
repo.Network.Push(remote, $"refs/heads/{to}:refs/heads/{to}", MakePushOptions());
}
catch
{
repo.Refs.UpdateTarget(toBranch.Reference.CanonicalName, oldToSha);
throw;
}
Log("──────────────────────────────────────");
Log($"✔ {from} → {to} promoted successfully ({pendingCommits.Count} commit(s)) at {DateTimeOffset.UtcNow:u}");
req.Status = PromotionStatus.Succeeded;
req.CompletedAt = DateTimeOffset.UtcNow;
}
// ── Branch reset (recovery) ────────────────────────────────────────────────
/// <summary>
/// Force-resets <paramref name="branchName"/> to <paramref name="toSha"/> and force-pushes to origin.
/// Used to recover a downstream branch that has drifted from trunk (e.g. after an accidental merge commit).
/// </summary>
public Task ResetBranchAsync(string branchName, string toSha, string repoName, CancellationToken ct) =>
Task.Run(() =>
{
var repoPath = GetRepoPath(repoName);
using var repo = new Repository(repoPath);
var commit = repo.Lookup<Commit>(toSha)
?? throw new InvalidOperationException($"SHA '{toSha}' not found in {repoName}.");
var branch = repo.Branches[branchName]
?? throw new InvalidOperationException($"Branch '{branchName}' not found in {repoName}.");
var oldSha = branch.Tip.Sha;
repo.Refs.UpdateTarget(branch.Reference.CanonicalName, commit.Sha);
try
{
var remote = repo.Network.Remotes["origin"]
?? throw new InvalidOperationException("No 'origin' remote.");
// Force push — "+" prefix overrides remote reflog
repo.Network.Push(remote, $"+refs/heads/{branchName}:refs/heads/{branchName}", MakePushOptions());
}
catch
{
repo.Refs.UpdateTarget(branch.Reference.CanonicalName, oldSha);
throw;
}
logger.LogInformation("Reset {Branch} from {Old} to {New} in {Repo}", branchName, oldSha[..7], commit.Sha[..7], repoName);
}, ct);
// ── Cherry-pick (partial promotion) ──────────────────────────────────────
/// <summary>
/// Cherry-picks the specified commits from <paramref name="from"/> onto <paramref name="to"/>
/// and pushes. Unlike a full fast-forward promotion, cherry-pick copies individual commits
/// as new commits — useful for promoting a subset of changes to a downstream environment.
/// Note: cherry-pick will cause the target branch to diverge from trunk.
/// </summary>
public async Task<PromotionRequest> CherryPickAsync(
string[] shas,
string from,
string to,
string requestedBy,
string? note,
Action<string> onLine,
CancellationToken ct,
string repoName = "Clarity")
{
if (!await _lock.WaitAsync(TimeSpan.Zero, ct))
{
var busy = new PromotionRequest { FromBranch = from, ToBranch = to, Status = PromotionStatus.Failed };
busy.Log.Add("⚠️ Another promotion or cherry-pick is already in progress.");
return busy;
}
var req = new PromotionRequest
{
FromBranch = from,
ToBranch = to,
RequestedBy = requestedBy,
Note = note,
Status = PromotionStatus.Running,
};
void Log(string line) { req.Log.Add(line); onLine(line); }
try
{
await Task.Run(() => CherryPickCore(shas, from, to, repoName, req, Log, ct), ct);
}
catch (Exception ex)
{
Log($"✖ Cherry-pick failed: {ex.Message}");
req.Status = PromotionStatus.Failed;
req.CompletedAt = DateTimeOffset.UtcNow;
logger.LogError(ex, "Cherry-pick {From}→{To} failed", from, to);
}
finally
{
await SaveAsync(req);
_lock.Release();
}
return req;
}
private void CherryPickCore(
string[] shas,
string from,
string to,
string repoName,
PromotionRequest req,
Action<string> Log,
CancellationToken ct)
{
Log($"▶ Cherry-pick {shas.Length} commit(s): {from} → {to} [{repoName}]");
if (!string.IsNullOrWhiteSpace(req.Note)) Log($" Note: {req.Note}");
Log("──────────────────────────────────────");
using var repo = new Repository(GetRepoPath(repoName));
if (repo.Info.IsBare)
throw new InvalidOperationException(
"Cherry-pick requires a non-bare repository clone. " +
"Ensure Git:Repos:{name} points to a standard (non-bare) clone.");
// 1. Fetch
Log(" Fetching origin...");
var remote = repo.Network.Remotes["origin"]
?? throw new InvalidOperationException("No 'origin' remote configured.");
var refSpecs = remote.FetchRefSpecs.Select(r => r.Specification).ToList();
repo.Network.Fetch(remote.Name, refSpecs, MakeFetchOptions());
// 2. Resolve target branch
var toBranch = repo.Branches[to]
?? throw new InvalidOperationException($"Branch '{to}' not found.");
// 3. Fast-forward `to` to its remote tracking branch (sync with origin)
var remoteTracking = repo.Branches[$"origin/{to}"];
if (remoteTracking?.Tip is not null && toBranch.Tip.Sha != remoteTracking.Tip.Sha)
{
Log($" Fast-forwarding {to} to origin/{to}...");
repo.Refs.UpdateTarget(toBranch.Reference.CanonicalName, remoteTracking.Tip.Sha);
toBranch = repo.Branches[to]!;
}
var savedToSha = toBranch.Tip.Sha;
var originalHeadBranchName = repo.Head.FriendlyName;
// 4. Resolve commits — shas arrive newest-first from UI (topological order);
// reverse so we apply oldest → newest (preserves logical order in history).
var commitsOrdered = shas
.Select(sha => repo.Lookup<Commit>(sha)
?? throw new InvalidOperationException($"Commit '{sha}' not found in {repoName}."))
.Reverse()
.ToList();
req.CommitCount = commitsOrdered.Count;
req.CommitLines = commitsOrdered.Select(c => $"{c.Sha[..7]} {c.MessageShort}").ToArray();
Log($" {commitsOrdered.Count} commit(s) to apply (oldest → newest):");
foreach (var c in commitsOrdered) Log($" {c.Sha[..7]} {c.MessageShort}");
ct.ThrowIfCancellationRequested();
// 5. Force-checkout target branch — discards any dirty working tree state left by a
// previous failed cherry-pick or interrupted operation. This is a server-only clone
// managed exclusively by the control plane, so force is always safe here.
Log($" Checking out {to} (force)...");
var forceCheckout = new CheckoutOptions { CheckoutModifiers = CheckoutModifiers.Force };
Commands.Checkout(repo, toBranch, forceCheckout);
try
{
var sig = MakeSig();
foreach (var commit in commitsOrdered)
{
ct.ThrowIfCancellationRequested();
Log($" Applying {commit.Sha[..7]} {commit.MessageShort}...");
var result = repo.CherryPick(commit, sig);
switch (result.Status)
{
case CherryPickStatus.CherryPicked:
Log($" \u2714 \u2192 {result.Commit!.Sha[..7]}");
break;
case CherryPickStatus.Conflicts:
Log($" \u2716 Conflict \u2014 aborting and rolling back");
repo.Reset(ResetMode.Hard, repo.Lookup<Commit>(savedToSha));
throw new InvalidOperationException(
$"Cherry-pick conflict on {commit.Sha[..7]}: {commit.MessageShort}. " +
"Resolve conflicts manually or promote a different set of commits.");
default:
Log($" \u2261 Already present or no changes \u2014 skipped");
break;
}
}
// 6. Push
Log($" Pushing {to} to origin...");
try
{
repo.Network.Push(remote, $"refs/heads/{to}:refs/heads/{to}", MakePushOptions());
}
catch
{
repo.Reset(ResetMode.Hard, repo.Lookup<Commit>(savedToSha));
throw;
}
Log("──────────────────────────────────────");
Log($"✔ Cherry-picked {commitsOrdered.Count} commit(s) to {to} at {DateTimeOffset.UtcNow:u}");
req.Status = PromotionStatus.Succeeded;
req.CompletedAt = DateTimeOffset.UtcNow;
}
finally
{
// Always restore HEAD to the original branch regardless of outcome
try
{
var headBranch = repo.Branches[originalHeadBranchName];
if (headBranch is not null)
Commands.Checkout(repo, headBranch, new CheckoutOptions { CheckoutModifiers = CheckoutModifiers.Force });
}
catch (Exception ex)
{
logger.LogWarning(ex, "Could not restore HEAD to '{Branch}' after cherry-pick", originalHeadBranchName);
}
}
}
// ── History persistence ──────────────────────────────────────────────────
private string HistoryPath
@@ -230,54 +563,18 @@ public class PromotionService(IConfiguration config, ILogger<PromotionService> l
try { return JsonSerializer.Deserialize<List<PromotionRequest>>(File.ReadAllText(HistoryPath), JsonOpts) ?? []; }
catch { return []; }
}
// ── Git helpers ──────────────────────────────────────────────────────────
private async Task<bool> BranchExistsAsync(string branch, CancellationToken ct)
{
var output = await GitOutputAsync($"branch --list {branch}", ct);
return !string.IsNullOrWhiteSpace(output);
}
private async Task<string> GitOutputAsync(string args, CancellationToken ct)
{
var psi = MakePsi(args);
using var proc = Process.Start(psi) ?? throw new InvalidOperationException("Failed to start git");
var output = await proc.StandardOutput.ReadToEndAsync(ct);
await proc.WaitForExitAsync(ct);
return output;
}
private async Task RunGitAsync(string args, CancellationToken ct, bool swallowErrors = false)
{
var psi = MakePsi(args);
using var proc = Process.Start(psi) ?? throw new InvalidOperationException("Failed to start git");
var stderr = await proc.StandardError.ReadToEndAsync(ct);
await proc.WaitForExitAsync(ct);
if (!swallowErrors && proc.ExitCode != 0)
throw new InvalidOperationException($"git {args} exited {proc.ExitCode}: {stderr.Trim()}");
logger.LogDebug("git {Args} → exit {Code}", args, proc.ExitCode);
}
private ProcessStartInfo MakePsi(string args) => new("git", args)
{
WorkingDirectory = RepoRoot,
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false,
CreateNoWindow = true,
};
}
/// <summary>A single unreleased commit — carries full SHA for cherry-pick operations.</summary>
public record CommitInfo(string Sha, string ShortSha, string Message, string Author, string Date);
/// <summary>Current status of a single branch in the promotion ladder.</summary>
public record BranchStatus(
string Branch,
bool Exists,
string? ShortHash,
string? LastCommitSummary,
int AheadOfNext, // commits this branch has that the next doesn't
int BehindNext, // commits next has that this branch doesn't (shouldn't happen in clean flow)
string[] UnreleasedLines // oneline log of the ahead commits
string Branch,
bool Exists,
string? ShortHash,
string? LastCommitSummary,
int AheadOfNext, // commits this branch has that the next doesn't
int BehindNext, // commits next has that this branch doesn't (diverged)
CommitInfo[] UnreleasedCommits // rich commit objects for cherry-pick UI
);