From 1cabad0efabaee63d83ea044b5c75900e132119b Mon Sep 17 00:00:00 2001
From: pchtsp <pchtsp@gmail.com>
Date: Fri, 12 Jul 2024 09:32:36 +0200
Subject: [PATCH] workaround to deactivate messages on licenses

---
 pulp/apis/__init__.py   |  2 +-
 pulp/apis/copt_api.py   | 16 ++++++++++++----
 pulp/apis/gurobi_api.py |  3 ++-
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/pulp/apis/__init__.py b/pulp/apis/__init__.py
index 41c3240f..5133a92a 100644
--- a/pulp/apis/__init__.py
+++ b/pulp/apis/__init__.py
@@ -151,7 +151,7 @@ def listSolvers(onlyAvailable=False):
     """
     result = []
     for s in _all_solvers:
-        solver = s()
+        solver = s(msg=False)
         if (not onlyAvailable) or solver.available():
             result.append(solver.name)
         del solver
diff --git a/pulp/apis/copt_api.py b/pulp/apis/copt_api.py
index f2631197..e2a9ed48 100644
--- a/pulp/apis/copt_api.py
+++ b/pulp/apis/copt_api.py
@@ -6,7 +6,7 @@
 
 from uuid import uuid4
 from .core import sparse, ctypesArrayFill, PulpSolverError
-from .core import clock, log
+from .core import clock
 
 from .core import LpSolver, LpSolver_CMD
 from ..constants import (
@@ -894,9 +894,17 @@ def __init__(
                 logPath=logPath,
                 warmStart=warmStart,
             )
-
-            self.coptenv = coptpy.Envr()
-            self.coptmdl = self.coptenv.createModel()
+            # workaround to deactivate logging when msg=False
+            if not self.msg:
+                devnull = open("/dev/null", "w")
+                oldstdout_fno = os.dup(sys.stdout.fileno())
+                os.dup2(devnull.fileno(), 1)
+                self.coptenv = coptpy.Envr()
+                self.coptmdl = self.coptenv.createModel()
+                os.dup2(oldstdout_fno, 1)
+            else:
+                self.coptenv = coptpy.Envr()
+                self.coptmdl = self.coptenv.createModel()
 
             if not self.msg:
                 self.coptmdl.setParam("Logging", 0)
diff --git a/pulp/apis/gurobi_api.py b/pulp/apis/gurobi_api.py
index ba8bf66d..514e10ac 100644
--- a/pulp/apis/gurobi_api.py
+++ b/pulp/apis/gurobi_api.py
@@ -440,7 +440,8 @@ def available(self):
             # normal execution
             return True
         # error: we display the gurobi message
-        warnings.warn(f"GUROBI error: {out}.")
+        if self.msg:
+            warnings.warn(f"GUROBI error: {out}.")
         return False
 
     def actualSolve(self, lp):