Distriction specific patch, not going upstream

Disable systemd-run if the command is not found.

diff --git a/xpra/scripts/main.py b/xpra/scripts/main.py
index 1c5e8ddaad..084aabe792 100755
--- a/xpra/scripts/main.py
+++ b/xpra/scripts/main.py
@@ -396,23 +396,26 @@ def use_systemd_run(s) -> bool:
     cmd = ["systemd-run", "--quiet"]
     if getuid() != 0:
         cmd += ["--user"]
-    cmd += ["--scope", "--", "true"]
-    proc = Popen(cmd, stdout=PIPE, stderr=PIPE, shell=False)
     try:
-        proc.communicate(timeout=2)
-        r = proc.returncode
-    except TimeoutExpired:  # pragma: no cover
-        r = None
-    if r is None:
-        try:
-            proc.terminate()
-        except Exception:
-            pass
+        cmd = ["systemd-run", "--quiet", "--user", "--scope", "--", "true"]
+        proc = Popen(cmd, stdout=PIPE, stderr=PIPE, shell=False)
         try:
-            proc.communicate(timeout=1)
+            proc.communicate(timeout=2)
+            r = proc.returncode
         except TimeoutExpired:  # pragma: no cover
             r = None
-    return r == 0
+        if r is None:
+            try:
+                proc.terminate()
+            except Exception:
+                pass
+            try:
+                proc.communicate(timeout=1)
+            except TimeoutExpired:  # pragma: no cover
+                r = None
+        return r==0
+    except FileNotFoundError:
+        return False


 def verify_gir():
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<div class='path'>path: <a href='/guix/log/?id=c11195cac3e9ef1625d54bcdbbbcd7a11dc78040'>root</a>/<a href='/guix/log/gnu?id=c11195cac3e9ef1625d54bcdbbbcd7a11dc78040'>gnu</a>/<a href='/guix/log/gnu/packages?id=c11195cac3e9ef1625d54bcdbbbcd7a11dc78040'>packages</a>/<a href='/guix/log/gnu/packages/mold.scm?id=c11195cac3e9ef1625d54bcdbbbcd7a11dc78040'>mold.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/packages/mold.scm?id=c11195cac3e9ef1625d54bcdbbbcd7a11dc78040&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-10-05 23:42:40 +0800'>2024-10-05</span></td><td><a href='/guix/commit/gnu/packages/mold.scm?id=c5ea9598d88b1951c858f6d91628c495f8411257'>gnu: mold: Update to 2.34.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mold.scm (mold): Update to 2.34.1.

Change-Id: Ia822b9170df33844af88578f040df4c3c0af3b6a
Signed-off-by: Zheng Junjie &lt;zhengjunjie@iscas.ac.cn&gt;
</span></span></td><td>Ashish SHUKLA via Guix-patches via</td></tr>
<tr><td><span title='2024-09-29 21:17:13 +0300'>2024-09-29</span></td><td><a href='/guix/commit/gnu/packages/mold.scm?id=f653a07bb893b028fdbfa2f46f486fcda6731d70'>gnu: mold: Only build with mimalloc on 64-bit systems.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mold.scm (mold)[arguments]: Adjust the configure-flags to
only use mimalloc on 64-bit systems.
[inputs]: Only add mimalloc when building for a 64-bit system.

Change-Id: I7fc8eed076072ccb49f180adbfb12683ae169eca
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-09-29 23:02:39 +0800'>2024-09-29</span></td><td><a href='/guix/commit/gnu/packages/mold.scm?id=10fcdd9100a6c1fa7efcd61558dfcfa0c6b3ad67'>gnu: mold: Update to 2.34.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mold.scm (mold): Update to 2.34.0.
[arguments](phases)&lt;force-system-xxhash&gt;: Update path.
&lt;fix-compiler-name-in-test&gt;: Update path.
&lt;skip-tbb-lto-test&gt;: Update path.
&lt;disable-rpath-test&gt;: Update path.

Change-Id: I21e8cdd057fb13b508299a1b0fd9b48f803959bd
Signed-off-by: Zheng Junjie &lt;zhengjunjie@iscas.ac.cn&gt;
</span></span></td><td>Ashish SHUKLA</td></tr>
<tr><td><span title='2024-08-07 17:24:08 -0500'>2024-08-07</span></td><td><a href='/guix/commit/gnu/packages/mold.scm?id=2b0f3b4e94e208da845350f47ea3a3fca83f35e9'>gnu: mold: Update to 2.33.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mold.scm (mold): Update to 2.33.0.

Change-Id: Ic491ffc7e549a06b52f75352fa2f33433ee75f55
Signed-off-by: jgart &lt;jgart@dismail.de&gt;
</span></span></td><td>Ashish SHUKLA</td></tr>
<tr><td><span title='2024-06-27 21:04:08 +0800'>2024-06-27</span></td><td><a href='/guix/commit/gnu/packages/mold.scm?id=97540acadc4d275cfe50ba75f2dc0122276da30d'>gnu: mold: Update to 2.32.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mold.scm (mold): Update to 2.32.1.

Change-Id: Iaf5b3b4ba09e19a35f471c08b7b130a4fee4d4fb
Signed-off-by: Zheng Junjie &lt;zhengjunjie@iscas.ac.cn&gt;
</span></span></td><td>Ashish SHUKLA</td></tr>
<tr><td><span title='2024-06-24 08:51:40 -0400'>2024-06-24</span></td><td><a href='/guix/commit/gnu/packages/mold.scm?id=7be6cb8acaa7ea8fba7f89e27adb01ad7485856e'>gnu: mold: Update to 2.32.0</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mold.scm (mold): Update to 2.32.0.

Change-Id: Ia99d57c92e9e9d75d80880376687b8a0b5fde184
Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Ashish SHUKLA</td></tr>