Let cgpt open devices in read-only mode when possible.
BUG=chromium-os:12430
TEST=manual
Running "make; make runtests" in src/platform/vboot_refererence will test
this change. Tests for use on a Chromebook are described in the bug report,
but will require a USB or SD card that has a physical write-protect switch.
Change-Id: I16a67bad3b59bec0981f4064f51fb1a29da65a90
Reviewed-on: https://gerrit.chromium.org/gerrit/21474
Tested-by: Bill Richardson <wfrichar@chromium.org>
Commit-Ready: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Che-Liang Chiou <clchiou@chromium.org>
diff --git a/tests/run_cgpt_tests.sh b/tests/run_cgpt_tests.sh
index ffd6f68..8b792b4 100755
--- a/tests/run_cgpt_tests.sh
+++ b/tests/run_cgpt_tests.sh
@@ -21,6 +21,7 @@
echo "Create an empty file to use as the device..."
NUM_SECTORS=1000
DEV=fake_dev.bin
+rm -f ${DEV}
dd if=/dev/zero of=${DEV} conv=notrunc bs=512 count=${NUM_SECTORS} 2>/dev/null
@@ -232,6 +233,28 @@
$GPT prioritize -i 1 -f ${DEV}
assert_pri 15 15 13 12 14 11 10 10 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 1 1 1 1 0
+
+# Now make sure that we don't need write access if we're just looking.
+echo "Test read vs read-write access..."
+chmod 0444 ${DEV}
+
+# These should fail
+$GPT create -z ${DEV} 2>/dev/null && error
+$GPT add -i 2 -P 3 ${DEV} 2>/dev/null && error
+$GPT repair ${DEV} 2>/dev/null && error
+$GPT prioritize -i 3 ${DEV} 2>/dev/null && error
+
+# Most 'boot' usage should fail too.
+$GPT boot -p ${DEV} 2>/dev/null && error
+dd if=/dev/zero of=fake_mbr.bin bs=100 count=1 2>/dev/null
+$GPT boot -b fake_mbr.bin ${DEV} 2>/dev/null && error
+$GPT boot -i 2 ${DEV} 2>/dev/null && error
+
+# These should pass
+$GPT boot ${DEV} >/dev/null
+$GPT show ${DEV} >/dev/null
+$GPT find -t kernel ${DEV} >/dev/null
+
echo "Done."
happy "All tests passed."