From f2bbf0cb4b3bcb58f4dfaced9864aa36b8361ac0 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Fri, 24 Apr 2020 10:56:46 +0300
Subject: Change: don't do an ssh invocation just to get number of CPUS

---
 contractor | 57 +++++++++++++++++++--------------------------------------
 1 file changed, 19 insertions(+), 38 deletions(-)

diff --git a/contractor b/contractor
index 38c4b39..cba9cf7 100755
--- a/contractor
+++ b/contractor
@@ -70,19 +70,12 @@ class ContractorApplication(cliapp.Application):
             # while to boot and we can do other things while that
             # happens.
             with Timer(self.verbose, 'start-worker'):
-                # Find number of CPUs.
-                er = self.exec_quietly(manager, GetCPUCount())
-                cpus = 1
-                for line in er.stdout.decode('UTF8').splitlines():
-                    if line.startswith('CPU(s):'):
-                        cpus = int(line.split()[-1])
-
                 execs = [
                     DestroyWorkerVM(),
                     UndefineWorkerVM(),
                     CopyWorkerImage(),
                     StartGuestNetworking(),
-                    CreateWorkerVM(cpus),
+                    CreateWorkerVM(),
                     TryUnmountWS(),
                     MountWS(),
                     ChownWS(),
@@ -108,7 +101,6 @@ class ContractorApplication(cliapp.Application):
                 ]
                 er = self.exec_quietly(manager, *execs)
                 worker_ip = er.stdout.decode('UTF8').strip()
-                timer.report('wait-for-worker')
 
             with Timer(self.verbose, 'prepare-workspace-worker'):
                 self.exec_quietly(manager, AttachWS())
@@ -141,7 +133,6 @@ class ContractorApplication(cliapp.Application):
                 if ws:
                     self.verbose('saving workspace to {}'.format(ws))
                     self.sync_from_workspace(dest, ws)
-                    timer.report('save-workspace')
 
         self.verbose('build finished OK')
 
@@ -486,39 +477,29 @@ class Mkdir(RemoteExecution):
         return self._argv
 
 
-class GetCPUCount(RemoteExecution):
-
-    def msg(self):
-        return 'get CPU count'
-
-    def argv(self):
-        return ['lscpu']
-
-
 class CreateWorkerVM(RemoteExecution):
 
-    def __init__(self, manager_cpus):
-        self._worker_cpus = max(manager_cpus - 1, 1)
-
     def msg(self):
         return 'creating worker VM'
 
     def argv(self):
-        return [
-            'virt-install',
-            '--connect', 'qemu:///system',
-            '--quiet',
-            '--name=worker',
-            '--memory=4096',
-            '--vcpus={}'.format(self._worker_cpus),
-            '--cpu=host',
-            '--import',
-            '--os-variant=debian9',
-            '--disk=path={},cache=none'.format(TEMP_IMG),
-            '--network=network=default',
-            '--graphics=spice',
-            '--noautoconsole',
-        ]
+        return ['sh', '-euxc', '''
+n="$(grep -c '^processor' /proc/cpuinfo)"
+n="$(expr "$n" - 1)"
+virt-install \
+    --connect=qemu:///system \
+    --quiet \
+    --name=worker \
+    --memory=4096 \
+    --vcpus="$n" \
+    --cpu=host \
+    --import \
+    --os-variant=debian9 \
+    --disk=path={img} \
+    --network=network=default \
+    --graphics=spice \
+    --noautoconsole \
+'''.format(img=TEMP_IMG)]
 
 
 class AttachWS(RemoteExecution):
@@ -624,7 +605,7 @@ class Timer:
         duration = now - self._prev
         self._prev = now
         self._report('time: {:.1f} s {}'.format(duration, self._title))
-        return exctype
+        return False
 
 
 ContractorApplication().run()
-- 
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