Avoid hanging Yast when tries to deactivate a DASD in use

Instead, an error message is shown to the user, including the details
when they are available.

Related to bsc#1091797

src/modules/DASDController.rb

@@ -29,6 +29,7 @@
 # Representation of the configuration of controller.
 # Input and output routines.
 require "yast"
+require "yast2/popup"
 require "shellwords"
 
 module Yast
@@ -532,6 +533,21 @@ def ReportActivationError(channel, ret)
             channel
           )
         )
+      when 16
+        # https://bugzilla.suse.com/show_bug.cgi?id=1091797#c8
+        details = []
+        details << "Stdout:\n #{ret["stdout"]}" unless ret["stdout"].to_s.empty?
+        details << "Stderr:\n #{ret["stderr"]}" unless ret["stderr"].to_s.empty?
+        headline = _("Error: channel in use")
+        # TRANSLATORS: error report, %1 is device identification
+        message = Builtins.sformat(_("%1 DASD is in use and cannot be deactivated."), channel)
+
+        if details.empty?
+          Report.Error(message)
+        else
+          message << "\n\n#{_("See the details for more info.")}"
+          Yast2::Popup.show(message, headline: headline, details: details.join("\n\n"))
+        end
       else
         Report.Error(
           Builtins.sformat(
@@ -589,7 +605,7 @@ def ActivateDisk(channel, diag)
     # @param [Boolean] diag boolean Activate DIAG or not
     def DeactivateDisk(channel, diag)
       command = Builtins.sformat(
-        "/sbin/dasd_configure '%1' %2 %3",
+        "/sbin/dasd_configure '%1' %2 %3 < /dev/null",
         channel,
         0,
         diag ? 1 : 0

test/dasd_controller_test.rb

@@ -7,6 +7,65 @@
 describe "Yast::DASDController" do
   subject { Yast::DASDController }
 
+  describe "#DeactivateDisk" do
+    let(:channel) { "0.0.0160" }
+    let(:diagnose) { false }
+    let(:exit_code) { 0 }
+    let(:command_result) { { "exit" => exit_code } }
+
+    before do
+      allow(Yast::Report).to receive(:Error)
+      allow(Yast2::Popup).to receive(:show)
+      allow(Yast::SCR).to receive(:Execute).and_return(command_result)
+      allow(Yast::SCR).to receive(:Read)
+        .with(Yast.path(".probe.disk")).once
+        .and_return(load_data("probe_disk_dasd.yml"))
+
+      subject.ProbeDisks()
+    end
+
+    it "redirects output to /dev/null" do
+      expect(Yast::SCR).to receive(:Execute)
+        .with(anything, /\/sbin\/dasd_configure .* < \/dev\/null/)
+
+      subject.DeactivateDisk(channel, diagnose)
+    end
+
+    context "when disk is being in use" do
+      let(:exit_code) { 16 }
+
+      it "returns nil" do
+        expect(subject.DeactivateDisk(channel, diagnose)).to be_nil
+      end
+
+      context "and there are details to show" do
+        let(:command_result) do
+          {
+            "exit"   => exit_code,
+            "stderr" => "Warning: ECKD DASD 0.0.0150 is in use!\n" \
+                        "The following resources may be affected:\n" \
+                        "- Mount point /mnt\n",
+            "stdout" => "Continue with operation? (yes/no)"
+          }
+        end
+
+        it "reports an error with details" do
+          expect(Yast2::Popup).to receive(:show).with(anything, hash_including(:headline, :details))
+
+          subject.DeactivateDisk(channel, diagnose)
+        end
+      end
+
+      context "and there are not details to show" do
+        it "reports an error" do
+          expect(Yast::Report).to receive(:Error).with(/in use/)
+
+          subject.DeactivateDisk(channel, diagnose)
+        end
+      end
+    end
+  end
+
   describe "#IsAvailable" do
     it "returns true if .probe.disk contains DASDs" do
       expect(Yast::SCR).to receive(:Read).with(Yast.path(".probe.disk")).once