getblockchaininfo: add trim_headers field

src/rpc/blockchain.cpp

@@ -1741,6 +1741,7 @@ RPCHelpMan getblockchaininfo()
     }
     obj.pushKV("size_on_disk", chainman.m_blockman.CalculateCurrentUsage());
     obj.pushKV("pruned",                node::fPruneMode);
+    obj.pushKV("trim_headers",          node::fTrimHeaders); // ELEMENTS
     if (g_signed_blocks) {
         if (!DeploymentActiveAfter(tip, chainparams.GetConsensus(), Consensus::DEPLOYMENT_DYNA_FED)) {
             CScript sign_block_script = chainparams.GetConsensus().signblockscript;

test/functional/feature_trim_headers.py

@@ -187,6 +187,10 @@ class TrimHeadersTest(BitcoinTestFramework):
         self.mine_blocks(101, False)
         self.sync_all()
         self.check_height(expected_height, all=True)
+        # check the new field in getblockchaininfo
+        assert not self.nodes[0].getblockchaininfo()["trim_headers"]
+        assert self.nodes[1].getblockchaininfo()["trim_headers"]
+        assert self.nodes[2].getblockchaininfo()["trim_headers"]
 
         self.log.info("Shut down trimmed nodes")
         self.stop_node(1)
@@ -201,7 +205,6 @@ class TrimHeadersTest(BitcoinTestFramework):
         tip = self.nodes[0].getblockhash(self.nodes[0].getblockcount())
         header = self.nodes[0].getblockheader(tip)
         block = self.nodes[0].getblock(tip)
-        info = self.nodes[0].getblockchaininfo()
 
         assert 'signblock_witness_asm' in header
         assert 'signblock_witness_hex' in header

test/functional/rpc_blockchain.py

@@ -123,6 +123,7 @@ class BlockchainTest(BitcoinTestFramework):
             'pruned',
             'size_on_disk',
             'time',
+            'trim_headers',
             'verificationprogress',
             'warnings',
         ]