[PATCH 5/6] tests/boot_linux_console: add extract_from_rpm method

[Liam Merwick <liam.merwick@oracle.com>]

Add a method to extract a specified file from an RPM to the test's
working directory and return the path to the extracted file.

Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
---
 tests/acceptance/boot_linux_console.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/acceptance/boot_linux_console.py b/tests/acceptance/boot_linux_console.py
index 43bc928b03a2..6af19ae3b14a 100644
--- a/tests/acceptance/boot_linux_console.py
+++ b/tests/acceptance/boot_linux_console.py
@@ -51,6 +51,20 @@ class BootLinuxConsole(Test):
         os.chdir(cwd)
         return self.workdir + path
 
+    def extract_from_rpm(self, rpm, path):
+        """
+        Extracts a file from a rpm package into the test workdir
+
+        :param rpm: path to the rpm archive
+        :param path: path within the rpm archive of the file to be extracted
+        :returns: path of the extracted file
+        """
+        cwd = os.getcwd()
+        os.chdir(self.workdir)
+        process.run("rpm2cpio %s | cpio -id %s" % (rpm, path), shell=True)
+        os.chdir(cwd)
+        return self.workdir + '/' + path
+
     def do_test_x86_64_machine(self):
         """
         :avocado: tags=arch:x86_64
-- 
1.8.3.1