Change in coreboot[master]: util/liveiso: Ensure compatible NixOS channel is used

[Felix Singer (Code Review)]

Felix Singer has submitted this change. ( https://review.coreboot.org/c/coreboot/+/60373 )

Change subject: util/liveiso: Ensure compatible NixOS channel is used
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util/liveiso: Ensure compatible NixOS channel is used

Config options and package names might change from channel to channel.
Thus, don't let nix-build depend on the locally configured NixOS
channel, but instead let `nixpkgs` point to a specific channel to ensure
that always a compatible channel is used.

For now, let `nixpkgs` point to NixOS 21.11, which is currently the
latest stable release. This needs to be updated after a new release.

Change-Id: Ia77c34f93f0e2c3d351ae229830adfce75a56ae4
Signed-off-by: Felix Singer 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60373
Tested-by: build bot (Jenkins) 
Reviewed-by: Michael Niewöhner 
---
M util/liveiso/build.sh
1 file changed, 2 insertions(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Michael Niewöhner: Looks good to me, approved

diff --git a/util/liveiso/build.sh b/util/liveiso/build.sh
index ee63bc5..702ace8 100755
--- a/util/liveiso/build.sh
+++ b/util/liveiso/build.sh
@@ -10,4 +10,5 @@

nix-build '<nixpkgs/nixos>' \
    -A config.system.build.isoImage \
-	-I nixos-config=$config
+	-I nixos-config=$config \
+	-I nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/heads/nixos-21.11.tar.gz

3 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.