Use bash from WSL as sh.exe for GitKraken (5.0.4) for Windows

gitkraken-wsl-bash.bat

@echo off
REM Make sure that the path to the script is correct!
@bash -l -c "~/bin/gitkraken-wsl-bash.sh %*"

gitkraken-wsl-bash.sh

#!/bin/bash

# Mount root for windows drives, default is /mnt/ but can be changed in /etc/wsl.conf
MOUNT_ROOT=/mnt/

# Read GitKraken's hook script and arguments from STDIN
read -r GITKRAKEN_CMD

# Cleanup the path to the script:
# - Replace two or more '\' in a row with a single '/'.
# - Replace the windows drive letter (C:) with the mount point for the drive (/mnt/c)
FIXED_CMD=$(echo $GITKRAKEN_CMD | sed 's_\\\{2,\}_/_g' | sed "s_\([A-Z]\)\:/_$MOUNT_ROOT\L\1/_g")

# Run the hook script
bash -c "$FIXED_CMD"

gitkraken-wsl.md

1. Copy gitkraken-wsl-bash.bat and gitkraken-wsl-bash.sh, I put them in ~/bin.
2. Make sure that the script path in the bat-file and MOUNT_ROOT in the sh-file are correct.
3. Set gitkraken-wsl-bash.bat as 'Path to sh.exe' in GitKraken.

I put both files into the same directory, adjusted the path in the gitkraken-wsl-bash.bat and set my GitKraken path for the sh.exe to this batch file.