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Update instructions for Ubuntu 20.04 #10

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Jun 2, 2021
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Update instructions for Ubuntu 20.04 #10

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e20bbca
Update instructions for Ubuntu 20.04
atiensivu Jul 29, 2020
50d379f
Fix formatting and missing 'fi'
atiensivu Aug 17, 2020
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53 changes: 34 additions & 19 deletions README.md
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
# wsl2-hacks
# wsl2-hacks - Updated for Ubuntu 20.04 / 20.10
Useful snippets / tools for using WSL2 as a development environment

Updated based on issue #7 guidance from '@scotte' and '@JohnTasto'
---

**Auto-start/services** (`systemd` and `snap` support)
Expand All @@ -21,11 +21,11 @@ With this setup your shells will be able to run `systemctl` commands, have auto-
This fake shell will intercept calls to `wsl.exe bash ...` and forward them to a real bash running in the right environment for `systemd`. If this sounds like a hack-- well, it is. However, I've tested various workflows and use this daily. That being said, your mileage may vary.

```
$ sudo touch /usr/bin/bash
$ sudo chmod +x /usr/bin/bash
$ sudo editor /usr/bin/bash
$ sudo touch /usr/local/bin/wsl2hack
$ sudo chmod +x /usr/local/bin/wsl2hack
$ sudo editor /usr/local/bin/wsl2hack
```

Add the following, be sure to replace `<YOURUSER>` with your WSL2 Linux username

```sh
Expand Down Expand Up @@ -54,16 +54,27 @@ With this setup your shells will be able to run `systemctl` commands, have auto-
exec "${USHELL}" "$@"
fi

# start systemd if not started
/usr/sbin/daemonize -l "${HOME}/.systemd.lock" /usr/bin/unshare -fp --mount-proc /lib/systemd/systemd --system-unit=basic.target 2>/dev/null
# wait for systemd to start
while [[ "${SYSTEMD_PID}" = "" ]]; do
sleep 0.05
SYSTEMD_PID=$(pgrep -xo systemd)
done

if [[ -z ${SYSTEMD_PID} ]]; then
# start systemd
/usr/bin/daemonize -l "${HOME}/.systemd.lock" /usr/bin/unshare -fp --mount-proc /lib/systemd/systemd --system-unit=basic.target

# wait for systemd to start
retries=50
while [[ -z ${SYSTEMD_PID} && $retries -ge 0 ]]; do
(( retries-- ))
sleep .1
SYSTEMD_PID=$(pgrep -xo systemd)
done

if [[ $retries -lt 0 ]]; then
>&2 echo "Systemd timed out; aborting."
exit 1
fi
fi

# enter systemd namespace
exec /usr/bin/nsenter -t "${SYSTEMD_PID}" -m -p --wd="${PWD}" /sbin/runuser -s "${USHELL}" "${UNAME}" -- "${@}"

```

3. Set the fake-`bash` as our `root` user's shell
Expand All @@ -75,16 +86,20 @@ With this setup your shells will be able to run `systemctl` commands, have auto-

Edit the `/etc/passwd` file:

`$ sudo editor /etc/passwd`
`$ vipw`

`$ vipw -s`

Find the line starting with `root:`, it should be the first line.
Change it to:
Add a line:

`root:x:0:0:root:/root:/usr/bin/bash`
`rootwsl:x:0:0:root:/root:/usr/local/bin/wsl2hack`

*Note the `/usr/bin/bash` here, slight difference*
*Never replace `/usr/bin/bash` as it is an actual binary in Ubuntu 20.04/20.10*

Save and close this file.

Make sure to update the primary passwd file *and* the shadow passwd file.

4. Exit out of / close the WSL2 shell

Expand All @@ -94,7 +109,7 @@ With this setup your shells will be able to run `systemctl` commands, have auto-

```
> wsl --shutdown
> ubuntu1804.exe config --default-user root
> ubuntu2004.exe config --default-user root
```

5. Re-open WSL2
Expand Down