test: Explicitly set encoding to utf8 when opening text files

These are text files but their encoding does not depend on the locale.
Not all of them require utf8 but it is better to fix it at something
to remove potential unpredictability.

This is necessary on FreeBSD where no locale is set by default,
and apparently Python defaults not only the terminal encoding to the locale
but that of every text file. So without LOCALE environment it defaults text
file encoding to ASCII. This causes problems with e.g. `bitcoin.conf`.

Luckily the locale doesn't affect the default encoding for str.encode() and
bytes.decode() on Python 3, so this is the only change necessary.

7 files changed, 12 insertions, 12 deletions

diff --git a/qa/rpc-tests/forknotify.py b/qa/rpc-tests/forknotify.py
index 5a3f75c80..a1901aeda 100755
--- a/qa/rpc-tests/forknotify.py
+++ b/qa/rpc-tests/forknotify.py
@@ -22,7 +22,7 @@ class ForkNotifyTest(BitcoinTestFramework):
     def setup_network(self):
         self.nodes = []
         self.alert_filename = os.path.join(self.options.tmpdir, "alert.txt")
-        with open(self.alert_filename, 'w') as f:
+        with open(self.alert_filename, 'w', encoding='utf8') as f:
             pass  # Just open then close to create zero-length file
         self.nodes.append(start_node(0, self.options.tmpdir,
                             ["-blockversion=2", "-alertnotify=echo %s >> \"" + self.alert_filename + "\""]))
@@ -44,7 +44,7 @@ class ForkNotifyTest(BitcoinTestFramework):
         self.nodes[1].generate(1)
         self.sync_all()
 
-        with open(self.alert_filename, 'r') as f:
+        with open(self.alert_filename, 'r', encoding='utf8') as f:
             alert_text = f.read()
 
         if len(alert_text) == 0:
@@ -56,7 +56,7 @@ class ForkNotifyTest(BitcoinTestFramework):
         self.nodes[1].generate(1)
         self.sync_all()
 
-        with open(self.alert_filename, 'r') as f:
+        with open(self.alert_filename, 'r', encoding='utf8') as f:
             alert_text2 = f.read()
 
         if alert_text != alert_text2:
diff --git a/qa/rpc-tests/multi_rpc.py b/qa/rpc-tests/multi_rpc.py
index 24373b257..cdeb94caa 100755
--- a/qa/rpc-tests/multi_rpc.py
+++ b/qa/rpc-tests/multi_rpc.py
@@ -26,7 +26,7 @@ class HTTPBasicsTest (BitcoinTestFramework):
         #Append rpcauth to bitcoin.conf before initialization
         rpcauth = "rpcauth=rt:93648e835a54c573682c2eb19f882535$7681e9c5b74bdd85e78166031d2058e1069b3ed7ed967c93fc63abba06f31144"
         rpcauth2 = "rpcauth=rt2:f8607b1a88861fac29dfccf9b52ff9f$ff36a0c23c8c62b4846112e50fa888416e94c17bfd4c42f88fd8f55ec6a3137e"
-        with open(os.path.join(self.options.tmpdir+"/node0", "bitcoin.conf"), 'a') as f:
+        with open(os.path.join(self.options.tmpdir+"/node0", "bitcoin.conf"), 'a', encoding='utf8') as f:
             f.write(rpcauth+"\n")
             f.write(rpcauth2+"\n")
 
diff --git a/qa/rpc-tests/p2p-versionbits-warning.py b/qa/rpc-tests/p2p-versionbits-warning.py
index 00dbbc02c..cceaa37b3 100755
--- a/qa/rpc-tests/p2p-versionbits-warning.py
+++ b/qa/rpc-tests/p2p-versionbits-warning.py
@@ -72,7 +72,7 @@ class VersionBitsWarningTest(BitcoinTestFramework):
     def setup_network(self):
         self.alert_filename = os.path.join(self.options.tmpdir, "alert.txt")
         # Open and close to create zero-length file
-        with open(self.alert_filename, 'w') as _:
+        with open(self.alert_filename, 'w', encoding='utf8') as _:
             pass
         self.extra_args = [["-debug", "-logtimemicros=1", "-alertnotify=echo %s >> \"" + self.alert_filename + "\""]]
         self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, self.extra_args)
@@ -95,7 +95,7 @@ class VersionBitsWarningTest(BitcoinTestFramework):
         peer.sync_with_ping()
 
     def test_versionbits_in_alert_file(self):
-        with open(self.alert_filename, 'r') as f:
+        with open(self.alert_filename, 'r', encoding='utf8') as f:
             alert_text = f.read()
         assert(VB_PATTERN.match(alert_text))
 
@@ -147,7 +147,7 @@ class VersionBitsWarningTest(BitcoinTestFramework):
         stop_node(self.nodes[0], 0)
         wait_bitcoinds()
         # Empty out the alert file
-        with open(self.alert_filename, 'w') as _:
+        with open(self.alert_filename, 'w', encoding='utf8') as _:
             pass
         self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, self.extra_args)
 
diff --git a/qa/rpc-tests/test_framework/coverage.py b/qa/rpc-tests/test_framework/coverage.py
index 23fce6101..13b33869f 100644
--- a/qa/rpc-tests/test_framework/coverage.py
+++ b/qa/rpc-tests/test_framework/coverage.py
@@ -50,7 +50,7 @@ class AuthServiceProxyWrapper(object):
         rpc_method = self.auth_service_proxy_instance._service_name
 
         if self.coverage_logfile:
-            with open(self.coverage_logfile, 'a+') as f:
+            with open(self.coverage_logfile, 'a+', encoding='utf8') as f:
                 f.write("%s\n" % rpc_method)
 
         return return_val
@@ -100,7 +100,7 @@ def write_all_rpc_commands(dirname, node):
         if line and not line.startswith('='):
             commands.add("%s\n" % line.split()[0])
 
-    with open(filename, 'w') as f:
+    with open(filename, 'w', encoding='utf8') as f:
         f.writelines(list(commands))
 
     return True
diff --git a/qa/rpc-tests/test_framework/netutil.py b/qa/rpc-tests/test_framework/netutil.py
index 573b06772..b92a9f6e1 100644
--- a/qa/rpc-tests/test_framework/netutil.py
+++ b/qa/rpc-tests/test_framework/netutil.py
@@ -58,7 +58,7 @@ def netstat(typ='tcp'):
     To get pid of all network process running on system, you must run this script
     as superuser
     '''
-    with open('/proc/net/'+typ,'r') as f:
+    with open('/proc/net/'+typ,'r',encoding='utf8') as f:
         content = f.readlines()
         content.pop(0)
     result = []
diff --git a/qa/rpc-tests/test_framework/util.py b/qa/rpc-tests/test_framework/util.py
index eee77f1a1..2f0d909a6 100644
--- a/qa/rpc-tests/test_framework/util.py
+++ b/qa/rpc-tests/test_framework/util.py
@@ -161,7 +161,7 @@ def initialize_datadir(dirname, n):
     if not os.path.isdir(datadir):
         os.makedirs(datadir)
     rpc_u, rpc_p = rpc_auth_pair(n)
-    with open(os.path.join(datadir, "bitcoin.conf"), 'w') as f:
+    with open(os.path.join(datadir, "bitcoin.conf"), 'w', encoding='utf8') as f:
         f.write("regtest=1\n")
         f.write("rpcuser=" + rpc_u + "\n")
         f.write("rpcpassword=" + rpc_p + "\n")
diff --git a/qa/rpc-tests/wallet-dump.py b/qa/rpc-tests/wallet-dump.py
index 6028d2c20..a37096a40 100755
--- a/qa/rpc-tests/wallet-dump.py
+++ b/qa/rpc-tests/wallet-dump.py
@@ -12,7 +12,7 @@ def read_dump(file_name, addrs, hd_master_addr_old):
     Read the given dump, count the addrs that match, count change and reserve.
     Also check that the old hd_master is inactive
     """
-    with open(file_name) as inputfile:
+    with open(file_name, encoding='utf8') as inputfile:
         found_addr = 0
         found_addr_chg = 0
         found_addr_rsv = 0