knotserver/git: refactor FindMainBranch to use git rev-parse #310

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func (g *GitRepo) FindMainBranch() (string, error) {

     

       
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	ref, err := g.r.Head()

     

       
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	if err != nil {

     

       
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		return "", fmt.Errorf("unable to find main branch: %w", err)

     

       
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	}

     

       
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	if ref.Name().IsBranch() {

     

       
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		return strings.TrimPrefix(string(ref.Name()), "refs/heads/"), nil

     

       
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	}

     

       
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	return "", fmt.Errorf("unable to find main branch: %w", err)

     

       
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}

     

       
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// WriteTar writes itself from a tree into a binary tar file format.

     

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}

     

       
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func (g *GitRepo) FindMainBranch() (string, error) {

     

       
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	output, err := g.revParse("--abbrev-ref", "HEAD")

     

       
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	if err != nil {

     

       
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		return "", fmt.Errorf("failed to find main branch: %w", err)

     

       
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	}

     

       
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	return strings.TrimSpace(string(output)), nil

     

       
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}

     

       
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// WriteTar writes itself from a tree into a binary tar file format.