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nixos-install: use FIFO for system closure

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This avoids running out of space in space-constrained environments,
e.g. VMs with relatively small amounts of memory and tmp on tmpfs
This commit is contained in:
Linus Heckemann 2017-07-12 22:04:49 +01:00
parent 8b1f1d93fa
commit 77ce02201e
1 changed files with 6 additions and 1 deletions
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7
nixos/modules/installer/tools/nixos-install.sh
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@ -126,6 +126,9 @@ function closure() {
} }
system_closure="$tmpdir/system.closure" system_closure="$tmpdir/system.closure"
# Use a FIFO for piping nix-store --export into nix-store --import, saving disk
# I/O and space. nix-store --import is run by nixos-prepare-root.
mkfifo $system_closure
if [ -z "$closure" ]; then if [ -z "$closure" ]; then
expr="(import <nixpkgs/nixos> {}).system" expr="(import <nixpkgs/nixos> {}).system"
@ -135,7 +138,9 @@ else
system_root=$closure system_root=$closure
# Create a temporary file ending in .closure (so nixos-prepare-root knows to --import it) to transport the store closure # Create a temporary file ending in .closure (so nixos-prepare-root knows to --import it) to transport the store closure
# to the filesytem we're preparing. Also delete it on exit! # to the filesytem we're preparing. Also delete it on exit!
nix-store --export $(nix-store -qR $closure) > $system_closure # Run in background to avoid blocking while trying to write to the FIFO
# $system_closure refers to
nix-store --export $(nix-store -qR $closure) > $system_closure &
fi fi
channel_root="$(nix-env -p /nix/var/nix/profiles/per-user/root/channels -q nixos --no-name --out-path 2>/dev/null || echo -n "")" channel_root="$(nix-env -p /nix/var/nix/profiles/per-user/root/channels -q nixos --no-name --out-path 2>/dev/null || echo -n "")"