Some files cannot be written but read-only access is still useful for tests. Add a fallback to read-only access when needed.
This is useful in CI when opening a large data file provided by docker, where read/write access would result in copying the file, thus needing a lot of extra disk space.
Signed-off-by: Simon Glass sjg@chromium.org ---
drivers/block/sandbox.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/block/sandbox.c b/drivers/block/sandbox.c index 53925ce9b6..1388498a1d 100644 --- a/drivers/block/sandbox.c +++ b/drivers/block/sandbox.c @@ -125,9 +125,14 @@ int host_dev_bind(int devnum, char *filename, bool removable)
fd = os_open(filename, OS_O_RDWR); if (fd == -1) { - printf("Failed to access host backing file '%s'\n", filename); - ret = -ENOENT; - goto err; + printf("Failed to access host backing file '%s', trying read-only\n", + filename); + fd = os_open(filename, OS_O_RDONLY); + if (fd == -1) { + printf("- still failed\n"); + ret = -ENOENT; + goto err; + } } ret = blk_create_device(gd->dm_root, "sandbox_host_blk", str, IF_TYPE_HOST, devnum, 512,