Distributed build: Difference between revisions

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If you get an error like <code>serialised integer ... is too big for type j</code> this means that something (<code>/etc/profile</code> for example) outputs bytes to <code>stdout</code> before launching the command specified on the ssh

command line. Either disable this behavior or have the output be sent to <code>stderr</code> instead.

===== Non standard Nix installations =====

If you are not root on the remote builder and have used '''nix-user-chroot''' or '''PRoot''' to install nix there (see [[Nix Installation Guide]]) then nix is not available on the PATH of the remote builder. We describe a solution for nix-user-chroot which is easily adapted to PRoot.

* Create a script <code>~/bin/nix_wrapper.sh</code> as follows:

#!/bin/sh

exec ~/bin/nix-user-chroot ~/.nix bash -c '

. ~/.nix-profile/etc/profile.d/nix.sh

exec $SSH_ORIGINAL_COMMAND

'

</syntaxHighlight>

Of course, adapt this script to the location of the store and nix-user-chroot. Make the script executable.

* In <code>~/.ssh/authorized_keys</code>, locate the line corresponding to <code>~/.ssh/nix_remote.pub</code> and prepend this: <code>command="/home/something/bin/nix_wrapper.sh"</code>.

Now ssh will transparently run nix-user-chroot when you connect to the remote builder with the specified ssh key.

== Single user install ==

@@ Line 47: / Line 47: @@
 If you get an error like <code>serialised integer ... is too big for type j</code> this means that something (<code>/etc/profile</code> for example) outputs bytes to <code>stdout</code> before launching the command specified on the ssh
 command line. Either disable this behavior or have the output be sent to <code>stderr</code> instead.
+===== Non standard Nix installations =====
+If you are not root on the remote builder and have used '''nix-user-chroot''' or '''PRoot''' to install nix there (see [[Nix Installation Guide]]) then nix is not available on the PATH of the remote builder. We describe a solution for nix-user-chroot which is easily adapted to PRoot.
+* Create a script <code>~/bin/nix_wrapper.sh</code> as follows:
+<syntaxHighlight lang="sh">
+#!/bin/sh
+exec ~/bin/nix-user-chroot ~/.nix bash -c '
+. ~/.nix-profile/etc/profile.d/nix.sh
+exec $SSH_ORIGINAL_COMMAND
+'
+</syntaxHighlight>
+Of course, adapt this script to the location of the store and nix-user-chroot. Make the script executable.
+* In <code>~/.ssh/authorized_keys</code>, locate the line corresponding to <code>~/.ssh/nix_remote.pub</code> and prepend this: <code>command="/home/something/bin/nix_wrapper.sh"</code>.
+Now ssh will transparently run nix-user-chroot when you connect to the remote builder with the specified ssh key.
 == Single user install ==