test: don't expand the subshell expression prematurely

We need to expand the subshell expression during the `bash -c`
invocation, not before, to take the desired effect, as now it expands to:

timeout 30 bash -c 'while [[ 0 -eq 0 ]]; do sleep 1; done'

instead of the expected:

timeout 30 bash -c 'while [[ $(coredumpctl list -q --no-legend 770 | wc -l) -eq 0 ]]; do sleep 1; done'

Follow-up to aadbd81f7f.

diff --git a/test/units/testsuite-74.coredump.sh b/test/units/testsuite-74.coredump.sh
index 6a299ecbfb1cd2276cfbea0ff570965d879d0561..3910abe0ec13ca33e2b8b2a9534e8e09cd6f9357 100755 (executable)
--- a/test/units/testsuite-74.coredump.sh
+++ b/test/units/testsuite-74.coredump.sh
@@ -59,7 +59,7 @@ printf '[Coredump]\nStorage=external' >/run/systemd/coredump.conf.d/99-external.
 "$MAKE_DUMP_SCRIPT" "$CORE_TEST_BIN" "SIGABRT"
 rm -fv /run/systemd/coredump.conf.d/99-external.conf
 # Wait a bit for the coredumps to get processed
-timeout 30 bash -c "while [[ $(coredumpctl list -q --no-legend $CORE_TEST_BIN | wc -l) -lt 4 ]]; do sleep 1; done"
+timeout 30 bash -c "while [[ \$(coredumpctl list -q --no-legend $CORE_TEST_BIN | wc -l) -lt 4 ]]; do sleep 1; done"
 
 coredumpctl
 SYSTEMD_LOG_LEVEL=debug coredumpctl
@@ -116,7 +116,7 @@ printf '[Coredump]\nStorage=external' >/run/systemd/coredump.conf.d/99-external.
 "${UNPRIV_CMD[@]}" "$MAKE_DUMP_SCRIPT" "$CORE_TEST_UNPRIV_BIN" "SIGABRT"
 rm -fv /run/systemd/coredump.conf.d/99-external.conf
 # Wait a bit for the coredumps to get processed
-timeout 30 bash -c "while [[ $(coredumpctl list -q --no-legend $CORE_TEST_UNPRIV_BIN | wc -l) -lt 4 ]]; do sleep 1; done"
+timeout 30 bash -c "while [[ \$(coredumpctl list -q --no-legend $CORE_TEST_UNPRIV_BIN | wc -l) -lt 4 ]]; do sleep 1; done"
 
 # root should see coredumps from both binaries
 coredumpctl info "$CORE_TEST_UNPRIV_BIN"
@@ -149,7 +149,7 @@ rm -f /tmp/core.{output,redirected}
 journalctl -b -n 1 --output=export --output-fields=MESSAGE,COREDUMP COREDUMP_EXE="/usr/bin/test-dump" |
     /usr/lib/systemd/systemd-coredump --backtrace $$ 0 0 6 1679509994 12345 mymachine
 # Wait a bit for the coredump to get processed
-timeout 30 bash -c "while [[ $(coredumpctl list -q --no-legend $$ | wc -l) -eq 0 ]]; do sleep 1; done"
+timeout 30 bash -c "while [[ \$(coredumpctl list -q --no-legend $$ | wc -l) -eq 0 ]]; do sleep 1; done"
 coredumpctl info "$$"
 coredumpctl info COREDUMP_HOSTNAME="mymachine"