File attributes like (executable bit) are not part of the cache digest

[nikhilkalige]

Description of the bug:

The cache entry doesn't account for the executable bits of the file, causing the cache poisoning.

Here's the scenario of what happened.

filegroup(scripts, srcs = ['a.sh'])
create_tarball(image, srcs = [scripts, more apps etc])

• User created a.sh without +x, bazel build image, copied the tar to the system, realized a.sh is not executable.
• User then chmod +x a.sh; bazel build image, copied the tar and saw that a.sh is still not an executable
• User did bazel clean no change, bazel clean --expunge and they complained it's still not working

Since the image was cached in the first step, the change to the executable bit was not recognized the build.

Bazel version: release 7.0.0-pre.20230123.5- (@non-git)

Slack conversation, with the same information as above https://bazelbuild.slack.com/archives/CA31HN1T3/p1699596635216589

[benjaminp]

#3400

[nikhilkalige]

@benjaminp Thank you.. Going to close this duplicate