[Bug]: expand_template with stamp = 1 ignores changes to volatile-status.txt

[daewok]

What happened?

My understanding is that the stamping helpers (which expand_template uses) are designed such that if stamp = 1, then the actions will always be re-run when volatile-status.txt changes. However, if I make a simple target and test that, it does not happen.

Version

Development (host) and target OS/architectures: linux/amd64

Output of bazel --version: bazel 7.1.2

Version of the Aspect rules, or other relevant rules from your
WORKSPACE or MODULE.bazel file: 2.7.6

Language(s) and/or frameworks involved: none

How to reproduce

1. Add the following to a BUILD file:


load("@aspect_bazel_lib//lib:expand_template.bzl", "expand_template")

expand_template(
    name = "stamped",
    out = "_stamped.tags.txt",
    stamp = 1,
    stamp_substitutions = {"BUILD_VERSION": "{{BUILD_TIMESTAMP}}"},
    template = [
        "BUILD_VERSION",
    ],
)

2. run bazel build :stamped
3. run cat bazel-bin/_stamped.tags.txt
4. wait a couple seconds
5. run bazel build :stamped
6. run cat bazel-bin/_stamped.tags.txt
7. observe that the same thing was printed in steps 3 and 6.

### Any other information?

_No response_

[daewok]

I think I wildly misinterpreted some of the things I read about expand_template and now believe it is behaving as expected.