MathworksUpgrade with R2025a too [skip ci]

Author: scivision

scripts/MatlabReleaseUpgrade.m

@@ -1,19 +1,87 @@
-disp(matlabRelease())
+%% Finds the program "MathWorksUpdateInstaller" used to check for Matlab updates.
+%
+% The usual MathWorksUpdateInstaller program was removed in R2025a.
+% There is another program under the Mathworks ServiceHost, but folks have
+% observed that program results in network error code 1804. Nonetheless, we
+% give the location of that program, hoping that the Mathworks will make a
+% solution, perhaps via "mpm upgrade" in the future.
+%
+% future: programmatic update is planned for the "mpm" program:
+% https://github.com/mathworks-ref-arch/matlab-dockerfile/issues/129#issuecomment-2783047083
+%
+% Ref: https://www.mathworks.com/matlabcentral/answers/1815365-how-do-i-uninstall-and-reinstall-the-mathworks-service-host
 
-r = fullfile(matlabroot, "bin", computer("arch"));
-mustBeFolder(r)
+function MatlabReleaseUpgrade()
+
+cmd = getUpgradePath();
+
+fprintf("Matlab upgrade program found:\n\n%s\n\n", cmd)
+
+end
+
+
+function cmd = getUpgradePath()
 
-cmd = fullfile(r, "MathWorksUpdateInstaller");
+name = "MathWorksUpdateInstaller";
 if ispc()
-  cmd = cmd + ".exe";
+  name = name + ".exe";
+elseif isunix() && ~ismac()
+  name = name + ".sh";
+end
+
+if isMATLABReleaseOlderThan('R2025a')
+  cmd = legacy_update_path(name);
+else
+  cmd = new_update_path(name);
 end
 
 if ~isfile(cmd)
-  if isMATLABReleaseOlderThan('R2025a')
-    error("Did not find upgrade program at %s", cmd)
-  else
-    error("Matlab R2025a changed the upgrade process, use the GUI.")
+  error("Did not find upgrade program at %s", cmd)
+end
+
+end
+
+
+function cmd = legacy_update_path(name)
+
+r = fullfile(matlabroot, "bin", computer("arch"));
+mustBeFolder(r)
+cmd = fullfile(r, name);
+
+end
+
+
+function cmd = new_update_path(name)
+
+arch = computer("arch");
+
+if ismac()
+  head = fullfile(getenv("HOME"), 'Library/Application Support/MathWorks');
+  if ~isfolder(head)
+    head = '/Library/Application Support/MathWorks';
   end
+  head = fullfile(head, 'ServiceHost');
+elseif ispc()
+  head = fullfile(getenv("LOCALAPPDATA"), 'MathWorks/ServiceHost');
+else
+  head = fullfile(getenv("HOME"), '.MathWorks/ServiceHost', getenv("HOSTNAME"));
 end
+mustBeFolder(head)
+
+bin_tail = fullfile("bin", arch);
 
-fprintf("Run this command in system Terminal to check for Matlab upgrade:\n\n%s\n\n", cmd)
+infoFile = fullfile(head, "LatestInstall.info");
+fid = fopen(infoFile);
+while ~feof(fid)
+  svcRoot = extractAfter(fgetl(fid), "Latest" + optionalPattern("DS") + "InstallRoot");
+  if ~isempty(svcRoot)
+    svcRoot = strip(strip(svcRoot), '"');
+    break
+  end
+end
+fclose(fid);
+mustBeNonempty(svcRoot)
+
+cmd = fullfile(svcRoot, bin_tail, name);
+
+end