moby--moby/daemon/graphdriver/overlay2
Oscar Bonilla c923f6ac3b Fix off-by-one bug
This is a fix for https://github.com/docker/for-linux/issues/1012.

The code was not considering that C strings are NULL-terminated so
we need to leave one extra byte.

Without this fix, the testcase in https://github.com/docker/for-linux/issues/1012
fails with

```
Step 61/1001 : RUN echo 60 > 60
 ---> Running in dde85ac3b1e3
Removing intermediate container dde85ac3b1e3
 ---> 80a12a18a241
Step 62/1001 : RUN echo 61 > 61
error creating overlay mount to /23456789112345678921234/overlay2/d368abcc97d6c6ebcf23fa71225e2011d095295d5d8c9b31d6810bea748bdf07-init/merged: no such file or directory
```

with the output of `dmesg -T` as:

```
[Sat Dec 19 02:35:40 2020] overlayfs: failed to resolve '/23456789112345678921234/overlay2/89e435a1b24583c463abb73e8abfad8bf8a88312ef8253455390c5fa0a765517-init/wor': -2
```

with this fix, you get the expected:

```
Step 126/1001 : RUN echo 125 > 125
 ---> Running in 2f2e56da89e0
max depth exceeded
```

Signed-off-by: Oscar Bonilla <6f6231@gmail.com>
2020-12-20 16:23:25 -08:00
..
check.go overlay: move supportsMultipleLowerDir to utils 2019-11-08 11:48:47 -08:00
mount.go daemon/graphdriver: normalize comment formatting 2019-11-27 15:43:23 +01:00
overlay.go Fix off-by-one bug 2020-12-20 16:23:25 -08:00
overlay_test.go Update overlay2 to use naive diff for changes 2018-06-20 11:07:36 -07:00
overlay_unsupported.go