31     def getFstab(self):  argument
32         self.dut.adb.root()
35             extension = self.dut.adb.shell("getprop ro.boot." + prop, no_except = True)
41                 contents = self.dut.adb.shell("cat " + filename + extension, no_except = True)
49     def isCheckpoint(self):  argument
50         fstab = self.getFstab().splitlines()
64     def setUpClass(self):  argument
65         self.dut = self.android_devices[0]
66         self.shell = self.dut.shell
67         self.isCheckpoint_ = self.isCheckpoint()
69     def reboot(self):  argument
70         self.dut.adb.reboot()
72           self.dut.adb.wait_for_device(timeout=900)
73         except self.dut.adb.AdbError as e:
80             self.dut.adb.root()
87             self.dut.adb.shell("ls");
92     def checkBooted(self):  argument
94           result = self.dut.adb.shell("getprop sys.boot_completed")
104     def testCheckpointEnabled(self):  argument
105         result = self.dut.adb.shell("getprop ro.product.first_api_level")
108           asserts.assertTrue(first_api_level < 29 or self.isCheckpoint_,
113     def testRollback(self):  argument
114         if not self.isCheckpoint_:
117         self.dut.adb.root()
121         self.checkBooted()
124         self.dut.adb.shell("setprop persist.vold.dont_commit_checkpoint 1")
125         self.dut.adb.shell("echo " + self._ORIGINALVALUE + " > " + self._CHECKPOINTTESTFILE)
126         result = self.dut.adb.shell("vdc checkpoint startCheckpoint 1", no_except = True)
128         self.reboot()
131         self.dut.adb.shell("echo " + self._MODIFIEDVALUE + " > " + self._CHECKPOINTTESTFILE)
132         self.reboot()
135         result = self.dut.adb.shell("cat " + self._CHECKPOINTTESTFILE)
136         asserts.assertEqual(result.strip(), self._ORIGINALVALUE)
139         self.dut.adb.shell("setprop persist.vold.dont_commit_checkpoint 0")
140         result = self.dut.adb.shell("vdc checkpoint commitChanges", no_except = True)
142         self.reboot()
143         self.dut.adb.shell("rm " + self._CHECKPOINTTESTFILE)
145     def testCommit(self):  argument
146         if not self.isCheckpoint_:
149         self.dut.adb.root()
153         self.checkBooted()
156         self.dut.adb.shell("setprop persist.vold.dont_commit_checkpoint 1")
157         self.dut.adb.shell("echo " + self._ORIGINALVALUE + " > " + self._CHECKPOINTTESTFILE)
158         result = self.dut.adb.shell("vdc checkpoint startCheckpoint 1", no_except = True)
160         self.reboot()
163         self.dut.adb.shell("echo " + self._MODIFIEDVALUE + " > " + self._CHECKPOINTTESTFILE)
164         self.dut.adb.shell("setprop persist.vold.dont_commit_checkpoint 0")
165         result = self.dut.adb.shell("vdc checkpoint commitChanges", no_except = True)
167         self.reboot()
170         result = self.dut.adb.shell("cat " + self._CHECKPOINTTESTFILE)
171         asserts.assertEqual(result.strip(), self._MODIFIEDVALUE)
174         self.dut.adb.shell("rm " + self._CHECKPOINTTESTFILE)