daemon: lvm: Use lvcreate --yes to avoid interactive prompts.

See https://bugzilla.redhat.com/show_bug.cgi?id=1930996#c1

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1930996

daemon/lvm.c

@@ -219,7 +219,7 @@ do_lvcreate (const char *logvol, const char *volgroup, int mbytes)
   snprintf (size, sizeof size, "%d", mbytes);
 
   r = command (NULL, &err,
-               "lvm", "lvcreate",
+               "lvm", "lvcreate", "--yes",
                "-L", size, "-n", logvol, volgroup, NULL);
   if (r == -1) {
     reply_with_error ("%s", err);

tests/regressions/Makefile.am

@@ -51,6 +51,7 @@ EXTRA_DIST = \
 	rhbz1370424.sh \
 	rhbz1370424.xml \
 	rhbz1477623.sh \
+	rhbz1930996.sh \
 	test-noexec-stack.pl
 
 TESTS = \
@@ -82,6 +83,7 @@ TESTS = \
 	rhbz1285847.sh \
 	rhbz1370424.sh \
 	rhbz1477623.sh \
+	rhbz1930996.sh \
 	test-big-heap \
 	test-noexec-stack.pl \
 	$(SLOW_TESTS)

tests/regressions/rhbz1930996.sh

@@ -0,0 +1,36 @@
+#!/bin/bash -
+# libguestfs
+# Copyright (C) 2017-2021 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+# Regression test for:
+# https://bugzilla.redhat.com/show_bug.cgi?id=1930996#c1
+#
+# Actually a bug/change in LVM, previously we failed to create an LV
+# if the underlying disk contained a filesystem signature.
+
+set -e
+
+$TEST_FUNCTIONS
+skip_if_skipped
+skip_unless_phony_guest fedora.img
+
+f=rhbz1930996.img
+rm -f $f
+
+guestfish -N $f=lvfs vgremove VG : vgcreate VG /dev/sda1 : lvcreate LV2 VG 100
+
+rm $f