[U-Boot] [PATCH] sandbox: restore ability to access host fs through standard commands

[Stephen Warren]

From: Stephen Warren <swarren at nvidia.com>

Commit 95fac6ab4589 "sandbox: Use os functions to read host device tree"
removed the ability for get_device_and_partition() to handle the "host"
device type, and redirect accesses to it to the host filesystem. This
broke some unit tests that use this feature. So, revert that change. The
code added back by this patch is slightly different to pacify checkpatch.

However, we're then left with "host" being both:
- A pseudo device that accesses the hosts real filesystem.
- An emulated block device, which accesses "sectors" inside a file stored
  on the host.

In order to resolve this discrepancy, rename the pseudo device from host
to hostfs, and adjust the unit-tests for this change.

Signed-off-by: Stephen Warren <swarren at nvidia.com>
---
 disk/part.c       | 19 +++++++++++++++++++
 test/command_ut.c |  8 ++++----
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/disk/part.c b/disk/part.c
index b3097e32f0eb..068be06c3baf 100644
--- a/disk/part.c
+++ b/disk/part.c
@@ -510,6 +510,25 @@ int get_device_and_partition(const char *ifname, const char *dev_part_str,
 	int part;
 	disk_partition_t tmpinfo;
 
+	/*
+	 * Special-case a psuedo block device "hostfs", to allow access to the
+	 * host's own filesystem.
+	 */
+	if (0 == strcmp(ifname, "hostfs")) {
+		*dev_desc = NULL;
+		info->start = = 0;
+		info->size = 0;
+		info->blksz = 0;
+		info->bootable = 0;
+		strcpy((char *)info->type, BOOT_PART_TYPE);
+		strcpy((char *)info->name, "Sandbox host");
+#ifdef CONFIG_PARTITION_UUIDS
+		info->uuid[0] = 0;
+#endif
+
+		return 0;
+	}
+
 	/* If no dev_part_str, use bootdevice environment variable */
 	if (!dev_part_str || !strlen(dev_part_str) ||
 	    !strcmp(dev_part_str, "-"))
diff --git a/test/command_ut.c b/test/command_ut.c
index b2666bfc182b..ae6466d0ed83 100644
--- a/test/command_ut.c
+++ b/test/command_ut.c
@@ -165,12 +165,12 @@ static int do_ut_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 
 #ifdef CONFIG_SANDBOX
 	/* File existence */
-	HUSH_TEST(e, "-e host - creating_this_file_breaks_uboot_unit_test", n);
-	run_command("sb save host - creating_this_file_breaks_uboot_unit_test 0 1", 0);
-	HUSH_TEST(e, "-e host - creating_this_file_breaks_uboot_unit_test", y);
+	HUSH_TEST(e, "-e hostfs - creating_this_file_breaks_uboot_unit_test", n);
+	run_command("sb save hostfs - creating_this_file_breaks_uboot_unit_test 0 1", 0);
+	HUSH_TEST(e, "-e hostfs - creating_this_file_breaks_uboot_unit_test", y);
 	/* Perhaps this could be replaced by an "rm" shell command one day */
 	assert(!os_unlink("creating_this_file_breaks_uboot_unit_test"));
-	HUSH_TEST(e, "-e host - creating_this_file_breaks_uboot_unit_test", n);
+	HUSH_TEST(e, "-e hostfs - creating_this_file_breaks_uboot_unit_test", n);
 #endif
 #endif
 
-- 
1.8.1.5