[U-Boot] [PATCH 1/2] tools: mkenvimage: Fix reading from slow pipe

Andre Przywara andre.przywara at arm.com
Sun Jun 30 01:45:00 UTC 2019

It is perfectly fine for the read(2) syscall to return with less than
the requested number of bytes read (short read, see the "RETURN VALUE"
section of the man page). This typically happens with slow input
(keyboard, network) or with complex pipes.

So far mkenvimage expects the exact number of requested bytes to be
read, assuming an end-of-file condition otherwise. This wrong behaviour
can be easily shown with:
$ (echo "foo=bar"; sleep 1; echo "bar=baz") | mkenvimage -s 256 -o out -
The second line will be missing from the output.

Correct this by checking for any positive, non-zero return value.

This fixes a problem with a complex pipe in one of my scripts, where
the environment consist of two parts.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
 tools/mkenvimage.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/mkenvimage.c b/tools/mkenvimage.c
index 75967d0c2d..ffaebd5565 100644
--- a/tools/mkenvimage.c
+++ b/tools/mkenvimage.c
@@ -173,8 +173,7 @@ int main(int argc, char **argv)
 				return EXIT_FAILURE;
 			filesize += readbytes;
-		} while (readbytes == readlen);
+		} while (readbytes > 0);
 	} else {
 		txt_filename = argv[optind];
 		txt_fd = open(txt_filename, O_RDONLY);

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