1 files changed, 99 insertions, 0 deletions
diff --git a/tests/qemu-iotests/common.nbd b/tests/qemu-iotests/common.nbd
new file mode 100644
index 000000000..a8cae8fe2
--- /dev/null
+++ b/tests/qemu-iotests/common.nbd
@@ -0,0 +1,99 @@
+#!/usr/bin/env bash
+# -*- shell-script-mode -*-
+#
+# Helpers for NBD server related config
+#
+# Copyright (C) 2018 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+nbd_unix_socket="${SOCK_DIR}/qemu-nbd.sock"
+nbd_tcp_addr="127.0.0.1"
+nbd_pid_file="${TEST_DIR}/qemu-nbd.pid"
+nbd_stderr_fifo="${TEST_DIR}/qemu-nbd.fifo"
+
+# If bash version is >= 4.1, this will be overwritten by a dynamically
+# assigned file descriptor value.
+nbd_fifo_fd=10
+
+nbd_server_stop()
+{
+    local NBD_PID
+    if [ -f "$nbd_pid_file" ]; then
+        read NBD_PID < "$nbd_pid_file"
+        rm -f "$nbd_pid_file"
+        if [ -n "$NBD_PID" ]; then
+            kill "$NBD_PID"
+        fi
+    fi
+    rm -f "$nbd_unix_socket" "$nbd_stderr_fifo"
+}
+
+nbd_server_start_unix_socket()
+{
+    nbd_server_stop
+    $QEMU_NBD -v -t -k "$nbd_unix_socket" --fork "$@"
+}
+
+nbd_server_start_tcp_socket()
+{
+    nbd_server_stop
+
+    mkfifo "$nbd_stderr_fifo"
+    for ((port = 10809; port <= 10909; port++))
+    do
+        # Redirect stderr to FIFO, so we can later decide whether we
+        # want to read it or to redirect it to our stderr, depending
+        # on whether the command fails or not
+        $QEMU_NBD -v -t -b $nbd_tcp_addr -p $port --fork "$@" \
+            2> "$nbd_stderr_fifo" &
+
+        # Taken from common.qemu
+        if [[ "${BASH_VERSINFO[0]}" -ge "5" ||
+            ("${BASH_VERSINFO[0]}" -ge "4" && "${BASH_VERSINFO[1]}" -ge "1") ]]
+        then
+            exec {nbd_fifo_fd}<"$nbd_stderr_fifo"
+        else
+            let _nbd_fifo_fd++
+            eval "exec ${_nbd_fifo_fd}<'$nbd_stderr_fifo'"
+        fi
+        wait $!
+
+        if test $? == 0
+        then
+            # Success, redirect qemu-nbd's stderr to our stderr
+            nbd_tcp_port=$port
+            (cat <&$nbd_fifo_fd >&2) &
+            eval "exec $nbd_fifo_fd>&-"
+            return
+        fi
+
+        # Failure, read the output
+        output=$(cat <&$nbd_fifo_fd)
+        eval "exec $nbd_fifo_fd>&-"
+
+        if ! echo "$output" | grep -q "Address already in use"
+        then
+            # Unknown error, print it
+            echo "$output" >&2
+            rm -f "$nbd_stderr_fifo"
+            exit 1
+        fi
+    done
+
+    echo "Cannot find free TCP port for nbd in range 10809-10909"
+    rm -f "$nbd_stderr_fifo"
+    exit 1
+}