Mupen64Plus supports a single data directory and a single plugin directory in
its configuration, yet we need data and plugin files from a variety of
packages.  The best way to deal with this is to install all packages from
which data and plugin files are needed into one's profile, and point the
configuration there.  Hence, the ui-console package provides propagated inputs
for packages with the most important data and plugin files, and this patch
provides the user instructions on what needs to be done in order to have
Mupen64Plus find the relevant data and plugins.

--- a/src/plugin.c
+++ b/src/plugin.c
@@ -122,6 +122,22 @@ m64p_error PluginSearchLoad(m64p_handle ConfigUI)
     {
         const char *plugindir = (*ConfigGetParamString)(ConfigUI, "PluginDir");
         lib_filelist = osal_library_search(plugindir);
+        /* Guix specific */
+        if (lib_filelist == NULL)
+        {
+            DebugMessage(M64MSG_ERROR, "No plugins found in PluginDir path: %s", plugindir);
+            DebugMessage(M64MSG_ERROR,
+                         "\n\n"
+                         "*********************************\n"
+                         "*** Notice for GNU Guix users ***\n"
+                         "*********************************\n"
+                         "\n"
+                         "You might want to edit your mupen64plus.cfg (in $XDG_CONFIG_HOME by default)\n"
+                         "and set SharedDataPath to /path/to/my_guix_profile/share/mupen64plus and\n"
+                         "PluginDir to /path/to/my_guix_profile/lib/mupen64plus so that data and plugins\n"
+                         "are found.\n"
+                         "\n");
+        }
     }
 
     /* if still no plugins found, search some common system folders */
sg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=8aab6e0dfbf0815eb295220e23cd58347697fb18'>root</a>/<a href='/guix/log/gnu?id=8aab6e0dfbf0815eb295220e23cd58347697fb18'>gnu</a>/<a href='/guix/log/gnu/machine?id=8aab6e0dfbf0815eb295220e23cd58347697fb18'>machine</a>/<a href='/guix/log/gnu/machine/digital-ocean.scm?id=8aab6e0dfbf0815eb295220e23cd58347697fb18'>digital-ocean.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/machine/digital-ocean.scm?id=8aab6e0dfbf0815eb295220e23cd58347697fb18&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-07-25 19:11:37 +0200'>2020-07-25</span></td><td><a href='/guix/commit/gnu/machine/digital-ocean.scm?id=d51bfe242fbe6f3f8f71d723e8fe0c7bbe711ba1'>Use 'formatted-message' instead of '&amp;message' where appropriate.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu.scm (%try-use-modules): Use 'formatted-message' instead of
'&amp;message'.
* gnu/machine/digital-ocean.scm (maybe-raise-unsupported-configuration-error):
Likewise.
* gnu/machine/ssh.scm (machine-check-file-system-availability): Likewise.
(machine-check-building-for-appropriate-system): Likewise.
(deploy-managed-host): Likewise.
(maybe-raise-unsupported-configuration-error): Likewise.
* gnu/packages.scm (search-patch): Likewise.
* gnu/services.scm (%service-with-default-value): Likewise.
(files-&gt;etc-directory): Likewise.
(fold-services): Likewise.
* gnu/system.scm (locale-name-&gt;definition*): Likewise.
* gnu/system/mapped-devices.scm (check-device-initrd-modules): Likewise.
(check-luks-device): Likewise.
* guix/channels.scm (latest-channel-instance): Likewise.
* guix/cve.scm (json-&gt;cve-items): Likewise.
* guix/git-authenticate.scm (commit-signing-key): Likewise.
(commit-authorized-keys): Likewise.
(authenticate-commit): Likewise.
(verify-introductory-commit): Likewise.
* guix/remote.scm (remote-pipe-for-gexp): Likewise.
* guix/scripts/graph.scm (assert-package): Likewise.
* guix/scripts/offload.scm (private-key-from-file*): Likewise.
* guix/ssh.scm (authenticate-server*): Likewise.
(open-ssh-session): Likewise.
(remote-inferior): Likewise.
* guix/ui.scm (matching-generations): Likewise.
* guix/upstream.scm (package-update): Likewise.
* tests/channels.scm ("latest-channel-instances, missing introduction for 'guix'"):
Catch 'formatted-message?'.
("authenticate-channel, wrong first commit signer"): Likewise.
* tests/lint.scm ("patches: not found"): Adjust message string.
* tests/packages.scm ("patch not found yields a run-time error"): Catch
'formatted-message?'.
* guix/lint.scm (check-patch-file-names): Handle 'formatted-message?'.
(check-derivation): Ditto.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-02-09 23:16:45 +0100'>2020-02-09</span></td><td><a href='/guix/commit/gnu/machine/digital-ocean.scm?id=e81344428726f3dae5d2a2e7bb296f46fcde6cc5'>Update e-mail address for Jakob L. Kreuze.</a><span class='msg-avail'>...<span class='msg-tooltip'>As requested here:
&lt;https://lists.gnu.org/archive/html/guix-devel/2020-02/msg00128.html&gt;.

* .mailmap: Add an entry for Jakob.
* gnu/machine.scm, gnu/machine/digital-ocean.scm, gnu/machine/ssh.scm,
gnu/packages/admin.scm, gnu/packages/i2p.scm, gnu/packages/music.scm,
gnu/packages/web.scm, gnu/tests/reconfigure.scm, guix/scripts/deploy.scm,
guix/scripts/system/reconfigure.scm: Update their e-mail address.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-10-22 18:32:52 +0200'>2019-10-22</span></td><td><a href='/guix/commit/gnu/machine/digital-ocean.scm?id=c93994b5e43acc6048b81836d30632e015306c92'>machine: digital-ocean: Rename 'enable-ipv6' to 'enable-ipv6?'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/machine/digital-ocean.scm (&lt;digital-ocean-configuration&gt;)[enable-ipv6]:
Rename to...
[enable-ipv6?]: ... this.
(deploy-digital-ocean): Adjust accordingly.
* doc/guix.texi (Invoking guix deploy): Adjust accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-10-22 18:32:52 +0200'>2019-10-22</span></td><td><a href='/guix/commit/gnu/machine/digital-ocean.scm?id=12712817ae97eb6305deeaad68ce17c9fa212917'>machine: Implement 'digital-ocean-environment-type'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/machine/digital-ocean.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Invoking guix deploy): Add documentation for
'digital-ocean-configuration'.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Jakob L. Kreuze</td></tr>