test: avoid getting stuck on /dev/fuse

On Fedora Rawhide checking /dev/fuse in the test is getting stuck and timing out:

[   47.930104] TEST-13-NSPAWN.sh[2588]: + testcase_fuse
[   47.930424] TEST-13-NSPAWN.sh[2589]: ++ cat
[   58.772538] audit: type=1131 audit(1777728357.726:778): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-importd comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[  901.882562] audit: type=1131 audit(1777729200.830:782): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-tmpfiles-clean comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Finishing after writing 176921 entries
qemu-system-x86_64: terminating on signal 15 from pid 70717 (/usr/bin/python3)

Wrap it with a timeout to avoid getting stuck forever

Follow-up for dc3223919f663b7c8b8d8d1d6072b4487df7709b

diff --git a/test/units/TEST-13-NSPAWN.nspawn.sh b/test/units/TEST-13-NSPAWN.nspawn.sh
index 47c19f08c01f23fc5b5b125c14f0354df9abb27f..0332a12f64665af0030f036949e7d6d09650548e 100755 (executable)
--- a/test/units/TEST-13-NSPAWN.nspawn.sh
+++ b/test/units/TEST-13-NSPAWN.nspawn.sh
@@ -1350,7 +1350,10 @@ testcase_unpriv() {
 }
 
 testcase_fuse() {
-    if [[ "$(cat <>/dev/fuse 2>&1)" != 'cat: -: Operation not permitted' ]]; then
+    # On some kernels reading from /dev/fuse without an attached connection blocks indefinitely
+    # rather than returning EPERM, so guard the probe with a short timeout and skip the test
+    # whenever we don't get the expected error string.
+    if [[ "$(timeout --foreground 5 cat <>/dev/fuse 2>&1)" != 'cat: -: Operation not permitted' ]]; then
         echo "FUSE is not supported, skipping the test..."
         return 0
     fi
@@ -1381,7 +1384,7 @@ testcase_fuse() {
     #    "cat: -: Operation not permitted"                   # pass the test; opened but not read
     #    "bash: line 1: /dev/fuse: Operation not permitted"  # fail the test; could not open
     #    ""                                                  # fail the test; reading worked
-    [[ "$(systemd-nspawn --register=no --pipe --directory="$root" \
+    [[ "$(timeout --foreground 30 systemd-nspawn --register=no --pipe --directory="$root" \
               bash -c 'cat <>/dev/fuse' 2>&1)" == 'cat: -: Operation not permitted' ]]
 
     rm -fr "$root"
@@ -1390,7 +1393,7 @@ testcase_fuse() {
 testcase_unpriv_fuse() {
     # Same as above, but for unprivileged operation.
 
-    if [[ "$(cat <>/dev/fuse 2>&1)" != 'cat: -: Operation not permitted' ]]; then
+    if [[ "$(timeout --foreground 5 cat <>/dev/fuse 2>&1)" != 'cat: -: Operation not permitted' ]]; then
         echo "FUSE is not supported, skipping the test..."
         return 0
     fi
@@ -1409,7 +1412,7 @@ testcase_unpriv_fuse() {
     create_dummy_ddi "$tmpdir" "$name"
     chown --recursive testuser: "$tmpdir"
 
-    [[ "$(run0 -u testuser --pipe systemd-run \
+    [[ "$(timeout --foreground 60 run0 -u testuser --pipe systemd-run \
               --user \
               --pipe \
               --property=Delegate=yes \