使用 Git 签名提交不要求我的密码

Question

I was trying to sign my commits with the command git commit -S but it fails without prompting my passphrase for my GPG key.

The error is:

error: gpg failed to sign the data
fatal: failed to write commit object

I noticed that if I run the following command before git commit -S :

gpg -o /dev/null --local-user MY_KEY_ID -as <(echo 1234) && echo "The correct passphrase was entered for this key"

...everything works well and my commits are properly signed. I think it's because my passphrase is cached but this is not the behaviour that I expect.

I was hoping that Git would prompt for my passphrase everytime I want to sign commits or tags.

The command to "unlock my key" was found on this question: How to use gpg command-line to check passphrase is correct

Answer 1

You likely need to tell pinentry , the software gpg uses to prompt for your password, where to prompt you.

export GPG_TTY=$(tty)
git commit -S

If this works I would recommend exporting GPG_TTY in your shell's 'rc' file.

gpg-agent documentation regarding GPG_TTY

Answer 2

For me, unsetting and setting again the signing key worked like a charm.

This works either if you are changing the signing key for another one or git suddenly stopped prompting for the passphrase.

// remove signing key
git config --unset user.signingkey

// add new signing key
git config user.signingkey SECRETKEYLONGID

// tell git to automatically sign every commit
git config commit.gpgsign true

// commit as usual
git commit -m "commit message"

Git explains hot to get the signing key long ID.

That's it.. I hope it comes handy.