Malformed /ac/ url when both http and disk caching enabled

[cocasema]

Description of the problem:

When both http and disk cache enabled, action result url is malformed.
It becomes /cas/ac_HEX instead of /ac/HEX.

Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

.bazelrc:
 build --remote_http_cache=http://127.0.0.1:9090
 build --remote_upload_local_results=true
 build --remote_timeout=5
 build --disk_cache=/cache/bazel/disk

bazel clean
bazel test :all

What operating system are you running Bazel on?

Linux Mint 19.1

What's the output of bazel info release?

release 0.25.0

Have you found anything relevant by searching the web?

Nope.

Any other information, logs, or outputs that you want to share?

I'm using https://github.com/buchgr/bazel-remote as remote caching service.

Build with http remote only:

2019/05/02 05:51:29  GET 404      172.20.0.1 /ac/34adacfa4223720ddca3008caf5b97d55af6b8e879fa225e6fe13b3faf981a68
2019/05/02 05:51:32  PUT 200      172.20.0.1 /cas/34adacfa4223720ddca3008caf5b97d55af6b8e879fa225e6fe13b3faf981a68
2019/05/02 05:51:32  PUT 200      172.20.0.1 /ac/34adacfa4223720ddca3008caf5b97d55af6b8e879fa225e6fe13b3faf981a68

Build with http remote + disk cache:

2019/05/02 05:59:14  GET 400      172.20.0.1 /cas/ac_34adacfa4223720ddca3008caf5b97d55af6b8e879fa225e6fe13b3faf981a68
2019/05/02 05:59:16  PUT 200      172.20.0.1 /cas/34adacfa4223720ddca3008caf5b97d55af6b8e879fa225e6fe13b3faf981a68
2019/05/02 05:59:16  PUT 400      172.20.0.1 /cas/ac_34adacfa4223720ddca3008caf5b97d55af6b8e879fa225e6fe13b3faf981a68

WARNING: Writing to Remote Cache:
400 Bad Request
resource name must be a SHA256 hash in hex. got '/cas/ac_34adacfa4223720ddca3008caf5b97d55af6b8e879fa225e6fe13b3faf981a68'

[buchgr]

This is currently being fixed by #8141

[cocasema]

Thanks! I somehow missed that issue...