[PATCH OSSTEST] ts-hosts-allocate-Standalone: abort if the host to use has changed

[Ian Campbell <ian.campbell@citrix.com>]

When a job has been run once then the selected host is stored in a runvar and
used from then on. This means that if you try to run on a different host (by
changing the config or by changing OSSTEST_HOST_HOST) then you may be
surprised when things happen to the original host and not the new one.

Abort when this is detected.

Changing host requires you to run:
    ./cs-adjust-flight -v $flight runvar-del $job host
$flight = standalone by default
$job = test-x-y-z or build-x etc
host = the literal string host (not either of the host names)

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
---
 ts-hosts-allocate-Standalone | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/ts-hosts-allocate-Standalone b/ts-hosts-allocate-Standalone
index 4ce0c0d..88a5d28 100755
--- a/ts-hosts-allocate-Standalone
+++ b/ts-hosts-allocate-Standalone
@@ -31,5 +31,13 @@ foreach my $ident (@ARGV) {
     $host ||= $c{"TestHost_$ident"};
     $host ||= $c{TestHost};
     $host || die "need host setting for $ident";
+
+    my $expected = $ENV{'OSSTEST_HOST_'.uc $ident}
+                   || $c{"TestHost_$ident"}
+                   || $c{TestHost};
+
+    die "$ident configuration mismatch $r{$ident} != $expected"
+	if $r{$ident} && $r{$ident} ne $expected;
+
     store_runvar($ident, $host);
 }
-- 
1.8.5.2