isabella232 / octoversion

.NET tool for determining version number based on the Git revision graph

Welcome to OctoVersion

What is OctoVersion?

OctoVersion is a dotnet tool for deriving a SemVer 2.0 version number based on a Git revision graph.

Getting started

Install the tool into the global tool registry:

dotnet tool install --global Octopus.OctoVersion.Tool

or into the local project's tool manifest:

dotnet tool install Octopus.OctoVersion.Tool

Run it against a local Git repository:

cd ~/code/my-app
octoversion --CurrentBranch=main # if installed globally
dotnet tool run octoversion --CurrentBranch=main # if installed locally

You should see output that looks something like this:

[22:16:32 INF] Version is 0.0.5

Integrating with build tools

Nuke

Add a reference to OctoVersion.Tool in your Nuke _build project. This can be done using the nuke command:

nuke :add-package Octopus.OctoVersion.Tool --version X.X.X

Add a field marked with [OctoVersion] and it will be auto-populated:

using Nuke.Common
using Nuke.Common.Git;
using Nuke.Common.Tools.OctoVersion;
using Serilog;

class Build : NukeBuild
{
     [GitRepository]
     readonly GitRepository GitRepository;

     string Branch => GitRepository.Branch;

     // The Required Attribute will automatically throw an exception if the 
     // OctoVersionInfo parameter is not set due to an error or misconfiguration in Nuke.
     [Required]
     // 'Framework = "net6.0"' is only required for net6.0 apps.
     [OctoVersion(UpdateBuildNumber = true, 
                  BranchParameter = nameof(Branch),
                  Framework = "net6.0")]
     readonly OctoVersionInfo OctoVersionInfo;
     
     Target PrintVersion => _ => _
     .Executes(() => {
                Log.Information($"The version is {OctoVersion.MajorMinorBuild}");
     });
}

Take a look at the Nuke OctoVersionAttribute for all available attribute properties.

Cake

#module nuget:?package=Cake.DotNetTool.Module&version=0.4.0
#addin "nuget:?package=Cake.OctoVersion&version=0.3.63"

// The list below is to manually resolve NuGet dependencies to work around a bug in Cake's dependency loader.
// Our intention is to remove this list again once the Cake bug is fixed.
//
// What we want:
// #addin "nuget:?package=Cake.OctoVersion&version=0.0.138&loaddependencies=true"
// (Note the loaddependencies=true parameter.)
//
// Our workaround:
#addin "nuget:?package=LibGit2Sharp&version=0.26.2"
#addin "nuget:?package=Serilog&version=2.8.0.0"
#addin "nuget:?package=Serilog.Settings.Configuration&version=3.1.0.0"
#addin "nuget:?package=Serilog.Sinks.Console&version=3.0.1.0"
#addin "nuget:?package=Serilog.Sinks.Literate&version=3.0.0.0"
#addin "nuget:?package=SerilogMetrics&version=2.1.0.0"
#addin "nuget:?package=Octopus.OctoVersion.Core&version=0.3.63"
#addin "nuget:?package=Cake.OctoVersion&version=0.0.138"
#addin "nuget:?package=Microsoft.Extensions.Primitives&version=3.1.7"
#addin "nuget:?package=Microsoft.Extensions.Configuration&version=3.1.7.0"
#addin "nuget:?package=Microsoft.Extensions.Configuration.Abstractions&version=3.1.7.0"
#addin "nuget:?package=Microsoft.Extensions.Configuration.Binder&version=3.1.7.0"
#addin "nuget:?package=Microsoft.Extensions.Configuration.CommandLine&version=3.1.7.0"
#addin "nuget:?package=Microsoft.Extensions.Configuration.EnvironmentVariables&version=3.1.7.0"
#addin "nuget:?package=Microsoft.Extensions.Configuration.FileExtensions&version=3.1.0.0"
#addin "nuget:?package=Microsoft.Extensions.Configuration.Json&version=3.1.7"
#addin "nuget:?package=Microsoft.Extensions.DependencyModel&version=2.0.4.0"
#addin "nuget:?package=Microsoft.Extensions.FileProviders.Abstractions&version=3.1.0.0"
#addin "nuget:?package=Microsoft.Extensions.FileProviders.Physical&version=3.1.0.0"

using Path = System.IO.Path;
using IO = System.IO;
using Cake.Common.Tools;

var target = Argument("target", "Default");
var configuration = Argument("configuration", "Release");

if (!BuildSystem.IsRunningOnTeamCity) OctoVersionDiscoverLocalGitBranch(out _);
OctoVersion(out var versionInfo);

Task("Default")
    .IsDependentOn("Build");

Task("Build")
    .IsDependentOn("Restore")
    .Does(() =>
    {
        DotNetCoreBuild("./source", new DotNetCoreBuildSettings
        {
            Configuration = configuration,
            NoRestore = true,
            ArgumentCustomization = args => args.Append($"/p:Version={versionInfo.FullSemVer} /p:InformationalVersion={versionInfo.FullSemVer}"),
            MSBuildSettings = new DotNetCoreMSBuildSettings
            {
                ArgumentCustomization = args => args.Append($"/p:Version={versionInfo.FullSemVer} /p:InformationalVersion={versionInfo.FullSemVer}")
            }
        });
    });

RunTarget(target);

TeamCity

octoversion --CurrentBranch=main --OutputFormats:0=TeamCity

##teamcity[buildNumber '0.0.12']
##teamcity[setParameter name='env.OCTOVERSION_Major' value='0']
##teamcity[setParameter name='OctoVersion.Major' value='0']
##teamcity[setParameter name='env.OCTOVERSION_Minor' value='0']
##teamcity[setParameter name='OctoVersion.Minor' value='0']
##teamcity[setParameter name='env.OCTOVERSION_Patch' value='12']
##teamcity[setParameter name='OctoVersion.Patch' value='12']
##teamcity[setParameter name='env.OCTOVERSION_MajorMinorPatch' value='0.0.12']
##teamcity[setParameter name='OctoVersion.MajorMinorPatch' value='0.0.12']
##teamcity[setParameter name='env.OCTOVERSION_PreReleaseTag' value='']
##teamcity[setParameter name='OctoVersion.PreReleaseTag' value='']
##teamcity[setParameter name='env.OCTOVERSION_PreReleaseTagWithDash' value='']
##teamcity[setParameter name='OctoVersion.PreReleaseTagWithDash' value='']
##teamcity[setParameter name='env.OCTOVERSION_BuildMetadata' value='']
##teamcity[setParameter name='OctoVersion.BuildMetadata' value='']
##teamcity[setParameter name='env.OCTOVERSION_BuildMetadataWithPlus' value='']
##teamcity[setParameter name='OctoVersion.BuildMetadataWithPlus' value='']
##teamcity[setParameter name='env.OCTOVERSION_FullSemVer' value='0.0.12']
##teamcity[setParameter name='OctoVersion.FullSemVer' value='0.0.12']```

Environment variables

octoversion --CurrentBranch=main --OutputFormats:0=Environment

OCTOVERSION_Major=0
OCTOVERSION_Minor=0
OCTOVERSION_Patch=5
OCTOVERSION_MajorMinorPatch=0.0.5
OCTOVERSION_PreReleaseTag=
OCTOVERSION_PreReleaseTagWithDash=
OCTOVERSION_BuildMetadata=
OCTOVERSION_BuildMetadataWithPlus=
OCTOVERSION_FullSemVer=0.0.5

JSON

octoversion --CurrentBranch=main --OutputFormats:0=Json

{
  "Major": 0,
  "Minor": 0,
  "Patch": 5,
  "MajorMinorPatch": "0.0.5",
  "PreReleaseTag": "",
  "PreReleaseTagWithDash": "",
  "BuildMetadata": "",
  "BuildMetadataWithPlus": "",
  "FullSemVer": "0.0.5"
}

Configuration

OctoVersion sources configuration from:

1. The first, if any, octoversion.json file (lower case!) it finds walking up from the current directory.
2. Environment variables prefixed with the OCTOVERSION_ prefix.
3. Command-line parameters.

with the later sources overriding the earlier ones. The configuration syntax for each is as per the standard .NET Core standard configuration providers:

• octoversion.json uses the JSON Configuration Provider in the same way that appsettings.json files do.
  • Yes, this means that you can hook in a customer Serilog sink using octoversion.json if you like :)
• Environment variables use the Environment Variables Configuration Provider.
• Command-line variables use the Command-line Configuration Provider.

FAQ

Can't you figure out the branch I'm on? Why do I have to specify it?

This way, madness lies.

It's important to remember that branches in Git are a lie. Branches are nothing more than pointers to a commit. It's entirely possible (and very likely) that a commit will be reachable from many branches - or no branches, if you've checked out a commit and have a detached head.

Rather than attempting to guess (and sneakily getting the answer incorrect), OctoVersion requires you to tell it which branch you're on. All good build servers will provide this as an environment variable or other build parameter, and it's trivial to pass the information to OctoVersion.

For local versioning, it's always possible to set up a bash/zsh alias along these lines:

alias ov="octoversion --CurrentBranch=`git branch --show-current`"