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 3813331a5..46e2c83a6 100755
--- a/xpra/scripts/main.py
+++ b/xpra/scripts/main.py
@@ -337,23 +337,26 @@ 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():
     try:
fac1ef'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/records.scm'>
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<div class='path'>path: <a href='/guix/log/?id=628bdd6223135e4447a6f71e580f8124bffac1ef'>root</a>/<a href='/guix/log/tests?id=628bdd6223135e4447a6f71e580f8124bffac1ef'>tests</a>/<a href='/guix/log/tests/records.scm?id=628bdd6223135e4447a6f71e580f8124bffac1ef'>records.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/tests/records.scm?id=628bdd6223135e4447a6f71e580f8124bffac1ef&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-06-04 10:59:28 +0200'>2023-06-04</span></td><td><a href='/guix/commit/tests/records.scm?id=178ffed3b7fe1784fff67b963c5c4bb667fbad2a'>tests: records: Add test for ellipsis in body.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/records.scm ("match-record, ellipsis in body"): New test.
</span></span></td><td>Josselin Poiret</td></tr>
<tr><td><span title='2023-06-04 10:59:25 +0200'>2023-06-04</span></td><td><a href='/guix/commit/tests/records.scm?id=4cd529362108086eeec25d4d465261415cff45b3'>records: Add MATCH-RECORD-LAMBDA.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/records.scm (match-record-lambda): New syntax.
* tests/records.scm ("match-record-lambda"): New test.

Signed-off-by: Josselin Poiret &lt;dev@jpoiret.xyz&gt;
</span></span></td><td>(unmatched-parenthesis ew syntax</td></tr>
<tr><td><span title='2023-06-04 10:34:35 +0200'>2023-06-04</span></td><td><a href='/guix/commit/tests/records.scm?id=b88e38d4b51b9aa0e857baeb614c000e491ad309'>records: match-record: Support thunked and delayed fields.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/records.scm (match-record): Unwrap matched thunked and delayed fields.
* tests/records.scm ("match-record, thunked field",
"match-record, delayed field"): New tests.

Signed-off-by: Josselin Poiret &lt;dev@jpoiret.xyz&gt;
</span></span></td><td>(unmatched-parenthesis d</td></tr>
<tr><td><span title='2022-12-27 23:53:42 +0100'>2022-12-27</span></td><td><a href='/guix/commit/tests/records.scm?id=363b20b68584d71556c2d8912dd07cbdacabdb25'>records: match-record supports specifying a different variable name.</a><span class='msg-avail'>...<span class='msg-tooltip'>An example:

(match-record obj &lt;my-type&gt;
  (field1 (field2 custom-var-name) field3)
  ...)

* guix/records.scm (match-record-inner): Add support for the new syntax.
* tests/records.scm ("match-record, simple"): Add a simple test case for the
new syntax.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Attila Lendvai</td></tr>
<tr><td><span title='2022-12-02 00:02:12 +0100'>2022-12-02</span></td><td><a href='/guix/commit/tests/records.scm?id=7c1161dba4c8930d3a500a72ccaaaf50df73f466'>records: 'match-record' checks fields at macro-expansion time.</a><span class='msg-avail'>...<span class='msg-tooltip'>This allows 'match-record' to be more efficient (field offsets are
computed at compilation time) and to report unknown fields at
macro-expansion time.

* guix/records.scm (map-fields): New macro.
(define-record-type*)[rtd-identifier]: New procedure.
Define TYPE as a macro and use a separate identifier for the RTD.
(lookup-field, match-record-inner): New macros.
(match-record): Rewrite in terms of 'match-error-inner'.
* tests/records.scm ("match-record, simple")
("match-record, unknown field"): New tests.
* gnu/services/cuirass.scm (cuirass-shepherd-service): Rename 'log-file'
local variable to 'main-log-file'.
* gnu/services/getmail.scm (serialize-getmail-configuration-file): Move
after &lt;getmail-configuration-file&gt; definition.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-07-01 12:10:29 +0200'>2022-07-01</span></td><td><a href='/guix/commit/tests/records.scm?id=741895676b124a8a9a6656a54b5b58fd35d8e0f9'>tests: Add sanitizer test.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/records.scm ("define-record-type* &amp; sanitize without default
value"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>