Why "source" doesn't work in a script run as a Gnome's Desktop Entry?

I have a desktop entry pointing to IntelliJ IDEA IDE. I wanted to add . ~/.bashrc at the beginning of the idea.sh script that is being executed by Desktop Entry. The point of that is that IDEA wasn't picking up my modified SSH_AUTH_SOCK env variable, that was defined there. So I added a very simple . ~/.bashrc at the beginning of idea.sh, to discover that the sourced code is not being run. Now some details. In ~/.bashrc I have this: # Set GPG TTY export GPG_TTY=$(tty) unset SSH_AGENT_PID if [ "${gnupg_SSH_AUTH_SOCK_by:-0}" -ne $$ ]; then export SSH_AUTH_SOCK="$(gpgconf --list-dirs agent-ssh-socket)" fi # Refresh gpg-agent tty in case user switches into an X session gpg-connect-agent updatestartuptty /bye >/dev/null I wanted this to run at the beginning of idea.sh, but . ~/.bashrc doesn't work, HOWEVER if I put this exact code directly in the idea.sh, in the same place, it will work just fine. Sourcing also works if I run idea.sh directly in my terminal. It doesn't work only if I run it by using Desktop Entry. The desktop entry in question is /home/luken/.local/share/applications/jetbrains-idea.desktop: [Desktop Entry] Version=1.0 Type=Application Name=IntelliJ IDEA Ultimate Edition Icon=/home/luken/Programy/idea-IU-182.4505.22/bin/idea.svg Exec="/home/luken/Programy/idea-IU-182.4505.22/bin/idea.sh" %f Comment=Capable and Ergonomic IDE for JVM Categories=Development;IDE; Terminal=false StartupWMClass=jetbrains-idea So to sum this up: # Running idea.sh in terminal: #!/bin/sh # # --------------------------------------------------------------------- # IntelliJ IDEA startup script. # --------------------------------------------------------------------- # . ~/.bashrc echo "${SSH_AUTH_SOCK}" > ~/auth.txt # ... Content of auth.txt: /run/user/1000/gnupg/S.gpg-agent.ssh **CORRECT**. # Running idea.shby using Desktop Entry shortcut: #!/bin/sh # # --------------------------------------------------------------------- # IntelliJ IDEA startup script. # --------------------------------------------------------------------- # . ~/.bashrc echo "${SSH_AUTH_SOCK}" > ~/auth.txt # ... Content of auth.txt: /run/user/1000/keyring/ssh **INCORRECT**. #!/bin/sh # # --------------------------------------------------------------------- # IntelliJ IDEA startup script. # --------------------------------------------------------------------- # # Set GPG TTY export GPG_TTY=$(tty) unset SSH_AGENT_PID if [ "${gnupg_SSH_AUTH_SOCK_by:-0}" -ne $$ ]; then export SSH_AUTH_SOCK="$(gpgconf --list-dirs agent-ssh-socket)" fi # Refresh gpg-agent tty in case user switches into an X session gpg-connect-agent updatestartuptty /bye >/dev/null echo "${SSH_AUTH_SOCK}" > ~/auth.txt # ... Content of auth.txt: /run/user/1000/gnupg/S.gpg-agent.ssh **CORRECT**. Anyone have any idea what is going on here or how to debug this?