iotests: Test help option for unsupporting formats

This adds test cases to 082 for qemu-img create/convert/amend "-o help"
on formats that do not support creation or amendment, respectively.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20180509210023.20283-7-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>

tests/qemu-iotests/082

@@ -97,6 +97,9 @@ run_qemu_img create -f $IMGFMT -o backing_file="$TEST_IMG" -o ,, -o help "$TEST_
 run_qemu_img create -f $IMGFMT -o help
 run_qemu_img create -o help
 
+# Try help option for a format that does not support creation
+run_qemu_img create -f bochs -o help
+
 echo
 echo === convert: Options specified more than once ===
 
@@ -151,6 +154,9 @@ run_qemu_img convert -O $IMGFMT -o backing_file="$TEST_IMG" -o ,, -o help "$TEST
 run_qemu_img convert -O $IMGFMT -o help
 run_qemu_img convert -o help
 
+# Try help option for a format that does not support creation
+run_qemu_img convert -O bochs -o help
+
 echo
 echo === amend: Options specified more than once ===
 
@@ -201,6 +207,9 @@ run_qemu_img amend -f $IMGFMT -o backing_file="$TEST_IMG" -o ,, -o help "$TEST_I
 run_qemu_img amend -f $IMGFMT -o help
 run_qemu_img convert -o help
 
+# Try help option for a format that does not support amendment
+run_qemu_img amend -f bochs -o help
+
 # success, all done
 echo "*** done"
 rm -f $seq.full

tests/qemu-iotests/082.out

@@ -249,6 +249,9 @@ Testing: create -o help
 Supported options:
 size             Virtual disk size
 
+Testing: create -f bochs -o help
+qemu-img: Format driver 'bochs' does not support image creation
+
 === convert: Options specified more than once ===
 
 Testing: create -f qcow2 TEST_DIR/t.qcow2 128M
@@ -502,6 +505,9 @@ Testing: convert -o help
 Supported options:
 size             Virtual disk size
 
+Testing: convert -O bochs -o help
+qemu-img: Format driver 'bochs' does not support image creation
+
 === amend: Options specified more than once ===
 
 Testing: amend -f foo -f qcow2 -o lazy_refcounts=on TEST_DIR/t.qcow2
@@ -763,4 +769,7 @@ Note that not all of these options may be amendable.
 Testing: convert -o help
 Supported options:
 size             Virtual disk size
+
+Testing: amend -f bochs -o help
+qemu-img: Format driver 'bochs' does not support option amendment
 *** done