[Rpm-maint] [rpm-software-management/rpm] Add a rpmKeyring iterator (PR #3365)

[Panu Matilainen]

@pmatilai commented on this pull request.



> @@ -61,6 +69,55 @@ rpmKeyring rpmKeyringFree(rpmKeyring keyring)
     return NULL;
 }
 
+rpmKeyringIterator rpmKeyringInitIterator(rpmKeyring keyring, int unused)
+{
+    if (!keyring || unused != 0)
+	return NULL;
+
+    keyring = rpmKeyringLink(keyring);
+
+    rpmKeyringIterator iter = new rpmKeyringIterator_s {};
+    iter->keyringlock = new rdlock(keyring->mutex);
+    iter->iterator = keyring->keys.cbegin();
+    iter->keyring = keyring;
+    iter->current = NULL;

Yup, the codebase isn't an example of how to do stuff in C++. 

I wouldn't have asked for it otherwise at all, but in this particular case it actually makes a difference: doing it like this allows you to take the lock right on construction.

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