To make git show --show-signature display the comment (in your case, benjamin_loison@benjamin-loison-framework) from your ~/.ssh/allowed_signers file in the signature verification line, you need to ensure that:

1. The comment is properly associated with the key in allowed_signers. Your current allowed_signers entry is correct:

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   benjamin.loison@CENSORED.fr namespaces="git" ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEomyoGWAGCMrc3sb2Vie7lVkMy5NBWvfWxAH/bqGeSw benjamin_loison@benjamin-loison-framework

   The comment (benjamin_loison@benjamin-loison-framework) is already appended to the key.

2. Git uses the allowed_signers file for verification. Git respects the allowed_signers file for signature verification, but the comment is not natively displayed in the output of git show --show-signature. The comment is only used for internal trust verification.

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Why the Comment Doesn't Appear

Git's --show-signature output is hardcoded to show:

• The signer's identity (from the signature itself, e.g., benjamin.loison@CENSORED.fr).
• The key type (e.g., ED25519).
• The key fingerprint (e.g., SHA256:BtnEgYTlHdOg1u+RmYcDE0mnfz1rhv5dSbQ2gyxW8B8).

It does not include the comment from allowed_signers in this line.

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Workarounds

1. Use gpg or ssh-keygen to Verify the Key

You can manually verify the key and its comment using:

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ssh-keygen -F benjamin.loison@CENSORED.fr -l

or

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ssh-keygen -l -f ~/.ssh/allowed_signers

This will show the comment, but it won't integrate with git show --show-signature.

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2. Custom Git Alias (Partial Solution)

Create a Git alias to append the comment to the output:

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git config --global alias.showsig '!f() { git show "$1" --show-signature --quiet | sed "s/Good \"git\" signature for \(.*\) with \(.*\) key \(.*\)/Good \"git\" signature for \1 with \2 key \3 (benjamin_loison@benjamin-loison-framework)/"; }; f'

Now, running:

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git showsig COMMIT_HASH

will append the comment to the output.

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3. Patch Git (Advanced)

If you want the comment to appear natively, you would need to:

• Modify Git's source code (specifically, the check_signature logic in signature.c).
• Recompile Git. This is not recommended for most users.

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4. Use a Wrapper Script

Create a script (e.g., git-show-sig) that:

1. Runs git show --show-signature --quiet.
2. Parses the output and appends the comment from allowed_signers.

Example:

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#!/bin/bash
commit_hash=$1
sig_line=$(git show "$commit_hash" --show-signature --quiet | grep "Good \"git\" signature")
comment=$(grep "benjamin.loison@CENSORED.fr" ~/.ssh/allowed_signers | awk '{print $NF}')
echo "$sig_line ($comment)"

Make it executable:

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chmod +x git-show-sig

Usage:

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./git-show-sig COMMIT_HASH

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Summary

• Git does not natively show the comment from allowed_signers in git show --show-signature.
• Workarounds: Use a custom alias, script, or manual verification.
• Best approach: Use a wrapper script or alias to append the comment to the output.