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commit: expose the different kinds of errors #3617

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Feb 16, 2016
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6 changes: 6 additions & 0 deletions include/git2/commit.h
Original file line number Diff line number Diff line change
Expand Up @@ -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);

Expand Down
8 changes: 7 additions & 1 deletion src/commit.c
Original file line number Diff line number Diff line change
Expand Up @@ -642,6 +642,12 @@ int git_commit_extract_signature(git_buf *signature, git_buf *signed_data, git_r
if ((error = git_odb_read(&obj, odb, commit_id)) < 0)
return error;

if (obj->cached.type != GIT_OBJ_COMMIT) {
giterr_set(GITERR_INVALID, "the requested type does not match the type in ODB");
error = GIT_ENOTFOUND;
goto cleanup;
}

buf = git_odb_object_data(obj);

while ((h = strchr(buf, '\n')) && h[1] != '\0' && h[1] != '\n') {
Expand Down Expand Up @@ -688,7 +694,7 @@ int git_commit_extract_signature(git_buf *signature, git_buf *signed_data, git_r
return git_buf_puts(signed_data, eol+1);
}

giterr_set(GITERR_INVALID, "this commit is not signed");
giterr_set(GITERR_OBJECT, "this commit is not signed");
error = GIT_ENOTFOUND;
goto cleanup;

Expand Down
11 changes: 11 additions & 0 deletions tests/commit/parse.c
Original file line number Diff line number Diff line change
Expand Up @@ -513,6 +513,17 @@ a simple commit which works\n";
cl_assert_equal_s(gpgsig, signature.ptr);
cl_assert_equal_s(data, signed_data.ptr);

/* Try to parse a tree */
cl_git_pass(git_oid_fromstr(&commit_id, "45dd856fdd4d89b884c340ba0e047752d9b085d6"));
cl_git_fail_with(GIT_ENOTFOUND, git_commit_extract_signature(&signature, &signed_data, g_repo, &commit_id, NULL));
cl_assert_equal_i(GITERR_INVALID, giterr_last()->klass);

/* Try to parse an unsigned commit */
cl_git_pass(git_odb_write(&commit_id, odb, passing_commit_cases[1], strlen(passing_commit_cases[1]), GIT_OBJ_COMMIT));
cl_git_fail_with(GIT_ENOTFOUND, git_commit_extract_signature(&signature, &signed_data, g_repo, &commit_id, NULL));
cl_assert_equal_i(GITERR_OBJECT, giterr_last()->klass);

git_buf_free(&signature);
git_buf_free(&signed_data);

}