test: customize /etc/os-release instead of /usr/lib/os-release

As per spec image builders can create a local /etc/os-release
with per-image IDs, so modify that one instead of the original
one in /usr/lib. For example we do this when we build debian
unstable images in mkosi.

diff --git a/test/units/TEST-82-SOFTREBOOT.sh b/test/units/TEST-82-SOFTREBOOT.sh
index 57c6431ffc4389c8938ff2d9aca6054907c48b61..9f76c8624545c9ecadf83d642010483099be04b3 100755 (executable)
--- a/test/units/TEST-82-SOFTREBOOT.sh
+++ b/test/units/TEST-82-SOFTREBOOT.sh
@@ -157,9 +157,9 @@ elif [ -f /run/TEST-82-SOFTREBOOT.touch ]; then
 
     # Copy os-release away, so that we can manipulate it and check that it is updated in the propagate
     # directory across soft reboots. Try to cover corner cases by truncating it.
-    mkdir -p /tmp/nextroot-lower/usr/lib
-    grep ID /etc/os-release >/tmp/nextroot-lower/usr/lib/os-release
-    echo MARKER=1 >>/tmp/nextroot-lower/usr/lib/os-release
+    mkdir -p /tmp/nextroot-lower/etc
+    grep ID /etc/os-release >/tmp/nextroot-lower/etc/os-release
+    echo MARKER=1 >>/tmp/nextroot-lower/etc/os-release
     cmp /etc/os-release /run/systemd/propagate/.os-release-stage/os-release
     (! grep -q MARKER=1 /etc/os-release)