Trying to sign commits on git using gpg on WSL but does not work

Question

I have recently tried the Windows Subsystem for Linux lately and as I was attempting to sign my git commits with a recently generated GPG key it spewed out,

verticalfile30@DESKTOP-U284V9I:~/cpo/wsltest$ git commit -S -m "gpg signing"
error: gpg failed to sign the data
fatal: failed to write commit object

I have used git long enough to know that I have to set the local or global variables on git to use my GPG key.

After the first error, I tried to generate another key but that also did not work, including the subkeys.

My GPGs were encrypted in RSA and RSA (default).

I have tried using articles on help.github.com but to no avail.

(Here are some specific sources.) https://help.github.com/en/articles/telling-git-about-your-signing-key

https://help.github.com/en/articles/signing-commits

Here is most of the terminal log

verticalfile30@DESKTOP-U284V9I:~/cpo/wsltest$ git config --global commit.gpgsign true
verticalfile30@DESKTOP-U284V9I:~/cpo/wsltest$ gpg2 --list-secret-keys --keyid-format LONG
gpg: checking the trustdb
gpg: marginals needed: 3  completes needed: 1  trust model: pgp
gpg: depth: 0  valid:   2  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 2u
gpg: next trustdb check due at 2021-08-22
/home/verticalfile30/.gnupg/pubring.kbx
---------------------------------------
sec   rsa4096/498F47808959B459 2019-08-23 [SC] [expires: 2021-08-22]
      A533C851D2905FC63C161831498F47808959B459
uid                 [ultimate] Vert Simon (Key#3) <[email protected]>
ssb   rsa4096/E4E65BE559FFBE2C 2019-08-23 [E] [expires: 2021-08-22]

sec   rsa4096/B3C88EE54DC15CC9 2019-08-23 [SC]
      87F5399E6BFEF88C1C64794CB3C88EE54DC15CC9
uid                 [ultimate] Vert S (Sop) <[email protected]>
ssb   rsa4096/E868623210106F9D 2019-08-23 [E]

verticalfile30@DESKTOP-U284V9I:~/cpo/wsltest$ git config --global user.signingkey E868623210106F9D
verticalfile30@DESKTOP-U284V9I:~/cpo/wsltest$ git commit -S -m "gpg signing"
error: gpg failed to sign the data
fatal: failed to write commit object
verticalfile30@DESKTOP-U284V9I:~/cpo/wsltest$ git config --global user.signingkey B3C88EE54DC15CC9
verticalfile30@DESKTOP-U284V9I:~/cpo/wsltest$ git commit -S -m "gpg signing"
error: gpg failed to sign the data
fatal: failed to write commit object

Many sources online, as well as other questions on Stack Overflow, ended up saying the same thing, set the global variables. Is there something I am forgetting or getting wrong? Thanks.

Answer 1

That was followed in microsoft/WSL issue 4029

But in that case, it was:

My key has a passphrase but there is no prompt to enter the passphrase.

But then I read this:

Step 3 is export GPG_TTY=$(tty), which sends the prompt to tty.
After entering my passphrase, everything works.

Example: danhorst/dotfiles commit 805a779, which follows gpg failed to sign the data fatal: failed to write commit object [Git 2.10.0].

Answer 2

Follow the below url to setup signed commit https://help.github.com/en/articles/telling-git-about-your-signing-key

if still getting gpg failed to sign the data fatal: failed to write commit object

this is not issue with git ,this is with GPG follow below steps

1. gpg --version

2. echo "test" | gpg --clearsign

if it is showing:

gpg: signing failed: Inappropriate ioctl for device
gpg: [stdin]: clear-sign failed: Inappropriate ioctl for device

3. then use export GPG_TTY=$(tty)

4. then try again echo "test" | gpg --clearsign in which PGP signature is.

Output:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

test
-----BEGIN PGP SIGNATURE-----

iLMEAQEKAB0WIQS2V0SFHi18psvDbo7uFF+LP7qc1gUCYLjB2QAKCRDuFF+LP7qc
1r5LBACB1m3Lpl21379qAvVamWcn9isdgdg34t34t43t34t34t434yGQHqikxWL7A5
Ls7giKZYscb30o0rkY6I1W9MjBBW96R2pnaYsioFpsf434dfg54rfdgfdgdfgdfpaIoU3k
JKrYxR7yMjqUv0a2jE+97kh+bSuzqwIkMHyikbABI90lY+4OLw==
=UHKx
-----END PGP SIGNATURE-----

5. git config -l | grep gpg

Output:

commit.gpgsign=true
gpg.program=gpg
tag.gpgsign=true

6. apply git commit -S -m "initial commit 🚀🚀🚀🚀"
7. or git config --global commit.gpgsign true

gpg failed to sign the data fatal: failed to write commit object [Git 2.10.0]