System.InvalidOperationException: Sequence contains no elements exception fixed

[d-rakviashvili]

System.InvalidOperationException: Sequence contains no elements exception fixed when mailineTip.Parent collection is empty
in MainlineVersionCalculator.FindMergeBaseBeforeForwardMerge method

Description

Following error occurs when running before first commit in non-mainline branch

An unexpected error occurred:
System.InvalidOperationException: Sequence contains no elements
at System.Linq.ThrowHelper.ThrowNoElementsException()
at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
at GitVersion.VersionCalculation.MainlineVersionCalculator.FindMergeBaseBeforeForwardMerge(Commit baseVersionSource, Branch mainline, Commit& mainlineTip)
at GitVersion.VersionCalculation.MainlineVersionCalculator.FindMainlineModeVersion(BaseVersion baseVersion)
at GitVersion.VersionCalculation.NextVersionCalculator.FindVersion()
at GitVersion.GitVersionTool.CalculateVersionVariables()
at GitVersion.GitVersionExecutor.RunGitVersionTool(GitVersionOptions gitVersionOptions)

Steps to reproduce

1. Create GitVersion.yml containing only one line:
   mode: Mainline

2. Issue following commands from GitBash:
   git init
   git commit -m "initial commit" --allow-empty
   git commit -b feature/f1
   gitversion

Related Issue

Motivation and Context

When using tool in mainline mode and running before first commit in non-mainline branch, exception occurs

How Has This Been Tested?

Debugged in local environment, comparing official release behavior and fixed version.

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[asbjornu]

Seems like this is related to #2379, but for another use-case. Can you please add a test that fail before the provided fix is added?

[d-rakviashvili]

Seems like this is related to #2379, but for another use-case. Can you please add a test that fail before the provided fix is added?

Ok, it will take some time. Have added simple steps to reproduce exception, thanks

Upd: Done
GetNextVersionOnNonMainlineBranchWithoutCommitsShouldWorkNormally

[asbjornu]

This is most excellent! Thank you for your contributions, @d-rakviashvili! 🙏

[github-actions]

🎉 This issue has been resolved in version 5.5.1 🎉
The release is available on:

• GitHub Release
• Chocolatey Package
• .Net Global Tool

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