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commit: expose the different kinds of errors

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We should be checking whether the object we're looking up is a commit,
and we should let the caller know whether the not-found return code
comes from a bad object type or just a missing signature.
This commit is contained in:
Carlos Martín Nieto
2016-02-16 14:06:48 +01:00
parent 1aa1492182
commit eadd0f05f6
3 changed files with 24 additions and 1 deletions
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6
include/git2/commit.h
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@@ -266,12 +266,18 @@ GIT_EXTERN(int) git_commit_header_field(git_buf *out, const git_commit *commit,
/**
* Extract the signature from a commit
*
* If the id is not for a commit, the error class will be
* `GITERR_INVALID`. If the commit does not have a signature, the
* error class will be `GITERR_OBJECT`.
*
* @param signature the signature block
* @param signed_data signed data; this is the commit contents minus the signature block
* @param repo the repository in which the commit exists
* @param commit_id the commit from which to extract the data
* @param field the name of the header field containing the signature
* block; pass `NULL` to extract the default 'gpgsig'
* @return 0 on success, GIT_ENOTFOUND if the id is not for a commit
* or the commit does not have a signature.
*/
GIT_EXTERN(int) git_commit_extract_signature(git_buf *signature, git_buf *signed_data, git_repository *repo, git_oid *commit_id, const char *field);