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Revision df716c98d203ab64cdf05f9c17fdae565b7daa1c authored by Eelco Dolstra on 23 June 2012, 04:28:35 UTC, committed by Eelco Dolstra on 23 June 2012, 04:28:35 UTC
In chroot builds, use a private network namespace
On Linux it's possible to run a process in its own network namespace,
meaning that it gets its own set of network interfaces, disjunct from
the rest of the system.  We use this to completely remove network
access to chroot builds, except that they get a private loopback
interface.  This means that:

- Builders cannot connect to the outside network or to other processes
  on the same machine, except processes within the same build.

- Vice versa, other processes cannot connect to processes in a chroot
  build, and open ports/connections do not show up in "netstat".

- If two concurrent builders try to listen on the same port (e.g. as
  part of a test), they no longer conflict with each other.

This was inspired by the "PrivateNetwork" flag in systemd.
1 parent 2f3f413
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nix-http-export.cgi.in 
#! /bin/sh

export HOME=/tmp
export NIX_REMOTE=daemon

TMP_DIR="${TMP_DIR:-/tmp/nix-export}"

@coreutils@/mkdir -p "$TMP_DIR" || true
@coreutils@/chmod a+r "$TMP_DIR"

needed_path="?$QUERY_STRING"
needed_path="${needed_path#*[?&]needed_path=}"
needed_path="${needed_path%%&*}"
#needed_path="$(echo $needed_path  | ./unhttp)"
needed_path="${needed_path//%2B/+}"
needed_path="${needed_path//%3D/=}"

echo needed_path: "$needed_path" >&2

NIX_STORE="${NIX_STORE_DIR:-/nix/store}"

echo NIX_STORE: "${NIX_STORE}" >&2

full_path="${NIX_STORE}"/"$needed_path"

if [ "$needed_path" != "${needed_path%.drv}" ]; then
	echo "Status: 403 You should create the derivation file yourself"
	echo "Content-Type: text/plain"
	echo
	echo "Refusing to disclose derivation contents"
	exit
fi

if @bindir@/nix-store --check-validity "$full_path"; then
	if ! [ -e nix-export/"$needed_path".nar.gz ]; then
		@bindir@/nix-store --export "$full_path" | @gzip@ > "$TMP_DIR"/"$needed_path".nar.gz
		@coreutils@/ln -fs  "$TMP_DIR"/"$needed_path".nar.gz nix-export/"$needed_path".nar.gz 
	fi;
	echo "Status: 301 Moved"
	echo "Location: nix-export/"$needed_path".nar.gz"
	echo
else 
	echo "Status: 404 No such path found"
	echo "Content-Type: text/plain"
	echo
	echo "Path not found:"
	echo "$needed_path"
	echo "checked:"
	echo "$full_path"
fi