[API] get pull, return head branch sha, even if deleted (#14931)
* API: return head branch sha, even if deleted * relax if ref not resolvable
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			@ -134,6 +134,24 @@ func ToAPIPullRequest(pr *models.PullRequest) *api.PullRequest {
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		}
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	}
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	if len(apiPullRequest.Head.Sha) == 0 && len(apiPullRequest.Head.Ref) != 0 {
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		baseGitRepo, err := git.OpenRepository(pr.BaseRepo.RepoPath())
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		if err != nil {
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			log.Error("OpenRepository[%s]: %v", pr.BaseRepo.RepoPath(), err)
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			return nil
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		}
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		defer baseGitRepo.Close()
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		refs, err := baseGitRepo.GetRefsFiltered(apiPullRequest.Head.Ref)
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		if err != nil {
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			log.Error("GetRefsFiltered[%s]: %v", apiPullRequest.Head.Ref, err)
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			return nil
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		} else if len(refs) == 0 {
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			log.Error("unable to resolve PR head ref")
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		} else {
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			apiPullRequest.Head.Sha = refs[0].Object.String()
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		}
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	}
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	if pr.Status != models.PullRequestStatusChecking {
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		mergeable := !(pr.Status == models.PullRequestStatusConflict || pr.Status == models.PullRequestStatusError) && !pr.IsWorkInProgress()
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		apiPullRequest.Mergeable = mergeable
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