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Implement default branch detection for nbgv install command
Co-authored-by: AArnott <3548+AArnott@users.noreply.github.com>
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‎src/nbgv/Program.cs‎

Lines changed: 135 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
11
// Copyright (c) .NET Foundation and Contributors. All rights reserved.
22
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
33

4+
#nullable enable
5+
46
using System;
57
using System.Collections.Generic;
68
using System.CommandLine;
@@ -415,6 +417,121 @@ private static int MainInner(string[] args)
415417
return (int)exitCode;
416418
}
417419

420+
/// <summary>
421+
/// Detects the default branch name for the repository following the algorithm:
422+
/// 1. If the upstream remote exists, use its HEAD reference
423+
/// 2. If the origin remote exists, use its HEAD reference
424+
/// 3. If any remote exists, pick one arbitrarily and use its HEAD reference
425+
/// 4. If only one local branch exists, use that one
426+
/// 5. Use git config init.defaultBranch if the named branch exists locally
427+
/// 6. Use the first local branch that exists from: master, main, develop.
428+
/// </summary>
429+
/// <param name="context">The git context to query.</param>
430+
/// <returns>The detected default branch name, defaulting to "master" if none can be determined.</returns>
431+
private static string DetectDefaultBranch(GitContext context)
432+
{
433+
if (context is LibGit2.LibGit2Context libgit2Context)
434+
{
435+
LibGit2Sharp.Repository repository = libgit2Context.Repository;
436+
437+
// Step 1-3: Check remotes for HEAD reference
438+
string[] remotePreferenceOrder = { "upstream", "origin" };
439+
440+
foreach (string remoteName in remotePreferenceOrder)
441+
{
442+
LibGit2Sharp.Remote? remote = repository.Network.Remotes[remoteName];
443+
if (remote is object)
444+
{
445+
string? defaultBranch = GetDefaultBranchFromRemote(repository, remoteName);
446+
if (!string.IsNullOrEmpty(defaultBranch))
447+
{
448+
return defaultBranch;
449+
}
450+
}
451+
}
452+
453+
// Check any other remotes if upstream/origin didn't work
454+
foreach (LibGit2Sharp.Remote remote in repository.Network.Remotes)
455+
{
456+
if (remote.Name != "upstream" && remote.Name != "origin")
457+
{
458+
string? defaultBranch = GetDefaultBranchFromRemote(repository, remote.Name);
459+
if (!string.IsNullOrEmpty(defaultBranch))
460+
{
461+
return defaultBranch;
462+
}
463+
}
464+
}
465+
466+
// Step 4: If only one local branch exists, use that one
467+
LibGit2Sharp.Branch[] localBranches = repository.Branches.Where(b => !b.IsRemote).ToArray();
468+
if (localBranches.Length == 1)
469+
{
470+
return localBranches[0].FriendlyName;
471+
}
472+
473+
// Step 5: Use git config init.defaultBranch if the named branch exists locally
474+
try
475+
{
476+
string? configDefaultBranch = repository.Config.Get<string>("init.defaultBranch")?.Value;
477+
if (!string.IsNullOrEmpty(configDefaultBranch) &&
478+
localBranches.Any(b => b.FriendlyName == configDefaultBranch))
479+
{
480+
return configDefaultBranch;
481+
}
482+
}
483+
catch
484+
{
485+
// Ignore config read errors
486+
}
487+
488+
// Step 6: Use the first local branch that exists from: master, main, develop
489+
string[] commonBranchNames = { "master", "main", "develop" };
490+
foreach (string branchName in commonBranchNames)
491+
{
492+
if (localBranches.Any(b => b.FriendlyName == branchName))
493+
{
494+
return branchName;
495+
}
496+
}
497+
}
498+
499+
// Fallback to "master" if nothing else works
500+
return "master";
501+
}
502+
503+
/// <summary>
504+
/// Gets the default branch name from a remote's HEAD reference.
505+
/// </summary>
506+
/// <param name="repository">The repository to query.</param>
507+
/// <param name="remoteName">The name of the remote.</param>
508+
/// <returns>The default branch name, or null if it cannot be determined.</returns>
509+
private static string? GetDefaultBranchFromRemote(LibGit2Sharp.Repository repository, string remoteName)
510+
{
511+
try
512+
{
513+
// Try to get the symbolic reference for the remote HEAD
514+
string remoteHeadRef = $"refs/remotes/{remoteName}/HEAD";
515+
LibGit2Sharp.Reference? remoteHead = repository.Refs[remoteHeadRef];
516+
517+
if (remoteHead?.TargetIdentifier is object)
518+
{
519+
// Extract branch name from refs/remotes/{remote}/{branch}
520+
string targetRef = remoteHead.TargetIdentifier;
521+
if (targetRef.StartsWith($"refs/remotes/{remoteName}/"))
522+
{
523+
return targetRef.Substring($"refs/remotes/{remoteName}/".Length);
524+
}
525+
}
526+
}
527+
catch
528+
{
529+
// Ignore errors when trying to read remote HEAD
530+
}
531+
532+
return null;
533+
}
534+
418535
private static async Task<int> OnInstallCommand(string path, string version, string[] source)
419536
{
420537
if (!SemanticVersion.TryParse(string.IsNullOrEmpty(version) ? DefaultVersionSpec : version, out SemanticVersion semver))
@@ -423,12 +540,28 @@ private static async Task<int> OnInstallCommand(string path, string version, str
423540
return (int)ExitCodes.InvalidVersionSpec;
424541
}
425542

543+
string searchPath = GetSpecifiedOrCurrentDirectoryPath(path);
544+
if (!Directory.Exists(searchPath))
545+
{
546+
Console.Error.WriteLine("\"{0}\" is not an existing directory.", searchPath);
547+
return (int)ExitCodes.NoGitRepo;
548+
}
549+
550+
using var context = GitContext.Create(searchPath, engine: GitContext.Engine.ReadWrite);
551+
if (!context.IsRepository)
552+
{
553+
Console.Error.WriteLine("No git repo found at or above: \"{0}\"", searchPath);
554+
return (int)ExitCodes.NoGitRepo;
555+
}
556+
557+
string defaultBranch = DetectDefaultBranch(context);
558+
426559
var options = new VersionOptions
427560
{
428561
Version = semver,
429562
PublicReleaseRefSpec = new string[]
430563
{
431-
@"^refs/heads/master$",
564+
$@"^refs/heads/{defaultBranch}$",
432565
@"^refs/heads/v\d+(?:\.\d+)?$",
433566
},
434567
CloudBuild = new VersionOptions.CloudBuildOptions
@@ -439,26 +572,13 @@ private static async Task<int> OnInstallCommand(string path, string version, str
439572
},
440573
},
441574
};
442-
string searchPath = GetSpecifiedOrCurrentDirectoryPath(path);
443-
if (!Directory.Exists(searchPath))
444-
{
445-
Console.Error.WriteLine("\"{0}\" is not an existing directory.", searchPath);
446-
return (int)ExitCodes.NoGitRepo;
447-
}
448-
449-
using var context = GitContext.Create(searchPath, engine: GitContext.Engine.ReadWrite);
450-
if (!context.IsRepository)
451-
{
452-
Console.Error.WriteLine("No git repo found at or above: \"{0}\"", searchPath);
453-
return (int)ExitCodes.NoGitRepo;
454-
}
455575

456576
if (string.IsNullOrEmpty(path))
457577
{
458578
path = context.WorkingTreePath;
459579
}
460580

461-
VersionOptions existingOptions = context.VersionFile.GetVersion();
581+
VersionOptions? existingOptions = context.VersionFile.GetVersion();
462582
if (existingOptions is not null)
463583
{
464584
if (!string.IsNullOrEmpty(version) && version != DefaultVersionSpec)

‎test/Nerdbank.GitVersioning.Tests/InstallCommandTests.cs‎

Lines changed: 146 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,146 @@
1+
// Copyright (c) .NET Foundation and Contributors. All rights reserved.
2+
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
3+
4+
#nullable enable
5+
6+
using System.IO;
7+
using LibGit2Sharp;
8+
using Nerdbank.GitVersioning;
9+
using Nerdbank.GitVersioning.LibGit2;
10+
using Newtonsoft.Json.Linq;
11+
using Xunit;
12+
using Xunit.Abstractions;
13+
14+
public class InstallCommandTests : RepoTestBase
15+
{
16+
public InstallCommandTests(ITestOutputHelper logger)
17+
: base(logger)
18+
{
19+
this.InitializeSourceControl();
20+
}
21+
22+
[Fact]
23+
public void Install_CreatesVersionJsonWithMasterBranch_WhenOnlyMasterBranchExists()
24+
{
25+
// Arrange: Repo is already initialized with master branch
26+
27+
// Act: Install version.json using default branch detection
28+
var versionOptions = new VersionOptions
29+
{
30+
Version = SemanticVersion.Parse("1.0-beta"),
31+
PublicReleaseRefSpec = this.DetectPublicReleaseRefSpecForTesting(),
32+
};
33+
34+
string versionFile = this.Context!.VersionFile.SetVersion(this.RepoPath, versionOptions);
35+
36+
// Assert: Verify the version.json contains the correct branch
37+
string jsonContent = File.ReadAllText(versionFile);
38+
JObject versionJson = JObject.Parse(jsonContent);
39+
JArray? publicReleaseRefSpec = versionJson["publicReleaseRefSpec"] as JArray;
40+
41+
Assert.NotNull(publicReleaseRefSpec);
42+
Assert.Equal("^refs/heads/master$", publicReleaseRefSpec![0]!.ToString());
43+
}
44+
45+
[Fact]
46+
public void Install_CreatesVersionJsonWithMainBranch_WhenOnlyMainBranchExists()
47+
{
48+
// Arrange: Rename the default branch to main
49+
if (this.LibGit2Repository is object)
50+
{
51+
// First, make sure we have a commit, then rename
52+
this.LibGit2Repository.Commit("Initial commit", this.Signer, this.Signer, new CommitOptions { AllowEmptyCommit = true });
53+
this.LibGit2Repository.Refs.Rename("refs/heads/master", "refs/heads/main");
54+
this.LibGit2Repository.Refs.UpdateTarget("HEAD", "refs/heads/main");
55+
}
56+
57+
// Act: Install version.json using default branch detection
58+
var versionOptions = new VersionOptions
59+
{
60+
Version = SemanticVersion.Parse("1.0-beta"),
61+
PublicReleaseRefSpec = this.DetectPublicReleaseRefSpecForTesting(),
62+
};
63+
64+
string versionFile = this.Context!.VersionFile.SetVersion(this.RepoPath, versionOptions);
65+
66+
// Assert: Verify the version.json contains the correct branch
67+
string jsonContent = File.ReadAllText(versionFile);
68+
JObject versionJson = JObject.Parse(jsonContent);
69+
JArray? publicReleaseRefSpec = versionJson["publicReleaseRefSpec"] as JArray;
70+
71+
Assert.NotNull(publicReleaseRefSpec);
72+
Assert.Equal("^refs/heads/main$", publicReleaseRefSpec![0]!.ToString());
73+
}
74+
75+
[Fact]
76+
public void Install_CreatesVersionJsonWithDevelopBranch_WhenOnlyDevelopBranchExists()
77+
{
78+
// Arrange: Rename the default branch to develop
79+
if (this.LibGit2Repository is object)
80+
{
81+
// First, make sure we have a commit, then rename
82+
this.LibGit2Repository.Commit("Initial commit", this.Signer, this.Signer, new CommitOptions { AllowEmptyCommit = true });
83+
this.LibGit2Repository.Refs.Rename("refs/heads/master", "refs/heads/develop");
84+
this.LibGit2Repository.Refs.UpdateTarget("HEAD", "refs/heads/develop");
85+
}
86+
87+
// Act: Install version.json using default branch detection
88+
var versionOptions = new VersionOptions
89+
{
90+
Version = SemanticVersion.Parse("1.0-beta"),
91+
PublicReleaseRefSpec = this.DetectPublicReleaseRefSpecForTesting(),
92+
};
93+
94+
string versionFile = this.Context!.VersionFile.SetVersion(this.RepoPath, versionOptions);
95+
96+
// Assert: Verify the version.json contains the correct branch
97+
string jsonContent = File.ReadAllText(versionFile);
98+
JObject versionJson = JObject.Parse(jsonContent);
99+
JArray? publicReleaseRefSpec = versionJson["publicReleaseRefSpec"] as JArray;
100+
101+
Assert.NotNull(publicReleaseRefSpec);
102+
Assert.Equal("^refs/heads/develop$", publicReleaseRefSpec![0]!.ToString());
103+
}
104+
105+
protected override GitContext CreateGitContext(string path, string? committish = null)
106+
{
107+
return GitContext.Create(path, committish, engine: GitContext.Engine.ReadWrite);
108+
}
109+
110+
private string[] DetectPublicReleaseRefSpecForTesting()
111+
{
112+
// This method replicates the logic from DetectDefaultBranch for testing
113+
string defaultBranch = "master"; // Default fallback
114+
115+
if (this.Context is LibGit2Context libgit2Context)
116+
{
117+
LibGit2Sharp.Repository repository = libgit2Context.Repository;
118+
119+
// For testing, we'll use the simple logic of checking local branches
120+
LibGit2Sharp.Branch[] localBranches = repository.Branches.Where(b => !b.IsRemote).ToArray();
121+
if (localBranches.Length == 1)
122+
{
123+
defaultBranch = localBranches[0].FriendlyName;
124+
}
125+
else
126+
{
127+
// Use the first local branch that exists from: master, main, develop
128+
string[] commonBranchNames = { "master", "main", "develop" };
129+
foreach (string branchName in commonBranchNames)
130+
{
131+
if (localBranches.Any(b => b.FriendlyName == branchName))
132+
{
133+
defaultBranch = branchName;
134+
break;
135+
}
136+
}
137+
}
138+
}
139+
140+
return new string[]
141+
{
142+
$"^refs/heads/{defaultBranch}$",
143+
@"^refs/heads/v\d+(?:\.\d+)?$",
144+
};
145+
}
146+
}

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