bug#42971: When following instructions in the "Building from Git" manual node, 'git verify-commit...' fails. File got moved?

[tchrzcz--- via Bug reports for GNU Guix <bug-guix@gnu.org>]

Hello,

https://guix.gnu.org/manual/en/html_node/Building-from-Git.html#Building-from-Git says:

"How do you ensure that you obtained a genuine copy of the repository? Guix itself provides a tool to authenticate your checkout, but you must first make sure this tool is genuine in order to “bootstrap” the trust chain. To do that, run:

git verify-commit `git log --format=%H build-aux/git-authenticate.scm`"

1. When I run the command, I get the following error:

"fatal: ambiguous argument 'build-aux/git-authenticate.scm': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
usage: git verify-commit [-v | --verbose] <commit>...

    -v, --verbose         print commit contents
    --raw                 print raw gpg status output"


2. So I looked for "git-authenticate.scm" with 'find' and got two results:
./tests/git-authenticate.scm
./guix/git-authenticate.scm

3. These two are different files, sizes don't match, 'diff' outputs a lot of stuff.

4. I searched for "git-authenticate" in NEWS, HACKING and README and didn't find anything.

5. Then I figured I'd look in Git commits and found these two:

https://git.savannah.gnu.org/cgit/guix.git/commit/?id=41f443c90af57f9537eccb1a1a45c6e11b377a32 "Add (guix git-authenticate)."
https://git.savannah.gnu.org/cgit/guix.git/commit/?id=96bf434c70c4346c6402658d3ec57ef64a8e521e "maint: Remove 'build-aux/git-authenticate.scm'."

I'm not fluent in Git, GPG, nor Guile. Do I just run the command with "guix/git-authenticate.scm" instead of "build-aux/git-authenticate.scm"?

Regards,
tchrzcz