105 lines
3.9 KiB
Bash
105 lines
3.9 KiB
Bash
#! @shell@
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# This script's goal is to perform all "static" setup of a filesystem structure from pre-built store paths. Everything
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# in here should run in a non-root context and inside a Nix builder. It's designed primarily to be called from image-
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# building scripts and from nixos-install, but because it makes very few assumptions about the context in which it runs,
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# it could be useful in other contexts as well.
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#
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# Current behavior:
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# - set up basic filesystem structure
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# - make Nix store etc.
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# - copy Nix, system, channel, and misceallaneous closures to target Nix store
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# - register validity of all paths in the target store
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# - set up channel and system profiles
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# Ensure a consistent umask.
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umask 0022
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set -e
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mountPoint="$1"
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channel="$2"
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system="$3"
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shift 3
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closures="$@"
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PATH="@coreutils@/bin:@nix@/bin:@perl@/bin:@utillinux@/bin:@rsync@/bin"
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if ! test -e "$mountPoint"; then
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echo "mount point $mountPoint doesn't exist"
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exit 1
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fi
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# Create a few of the standard directories in the target root directory.
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mkdir -m 0755 -p $mountPoint/dev $mountPoint/proc $mountPoint/sys $mountPoint/etc $mountPoint/run $mountPoint/home
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mkdir -m 01777 -p $mountPoint/tmp
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mkdir -m 0755 -p $mountPoint/tmp/root
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mkdir -m 0755 -p $mountPoint/var
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mkdir -m 0700 -p $mountPoint/root
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ln -sf /run $mountPoint/var/run
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# Create the necessary Nix directories on the target device
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mkdir -m 0755 -p \
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$mountPoint/nix/var/nix/gcroots \
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$mountPoint/nix/var/nix/temproots \
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$mountPoint/nix/var/nix/userpool \
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$mountPoint/nix/var/nix/profiles \
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$mountPoint/nix/var/nix/db \
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$mountPoint/nix/var/log/nix/drvs
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mkdir -m 1775 -p $mountPoint/nix/store
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# All Nix operations below should operate on our target store, not /nix/store.
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# N.B: this relies on Nix 1.12 or higher
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export NIX_REMOTE=local?root=$mountPoint
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# Copy our closures to the Nix store on the target mount point, unless they're already there.
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for i in $closures; do
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# We support closures both in the format produced by `nix-store --export` and by `exportReferencesGraph`,
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# mostly because there doesn't seem to be a single format that can be produced outside of a nix build and
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# inside one. See https://github.com/NixOS/nix/issues/1242 for more discussion.
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if [[ "$i" =~ \.closure$ ]]; then
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echo "importing serialized closure $i to $mountPoint..."
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nix-store --import < $i
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else
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# There has to be a better way to do this, right?
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echo "copying closure $i to $mountPoint..."
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for j in $(perl @pathsFromGraph@ $i); do
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echo " $j... "
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rsync -a $j $mountPoint/nix/store/
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done
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nix-store --option build-users-group root --register-validity < $i
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fi
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done
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# Create the required /bin/sh symlink; otherwise lots of things
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# (notably the system() function) won't work.
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if [ ! -x $mountPoint/@shell@ ]; then
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echo "Error: @shell@ wasn't included in the closure" >&2
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exit 1
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fi
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mkdir -m 0755 -p $mountPoint/bin
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ln -sf @shell@ $mountPoint/bin/sh
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echo "setting the system closure to '$system'..."
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nix-env "${extraBuildFlags[@]}" -p $mountPoint/nix/var/nix/profiles/system --set "$system"
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ln -sfn /nix/var/nix/profiles/system $mountPoint/run/current-system
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# Copy the NixOS/Nixpkgs sources to the target as the initial contents of the NixOS channel.
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mkdir -m 0755 -p $mountPoint/nix/var/nix/profiles
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mkdir -m 1777 -p $mountPoint/nix/var/nix/profiles/per-user
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mkdir -m 0755 -p $mountPoint/nix/var/nix/profiles/per-user/root
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if [ -z "$noChannelCopy" ] && [ -n "$channel" ]; then
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echo "copying channel..."
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nix-env --option build-use-substitutes false "${extraBuildFlags[@]}" -p $mountPoint/nix/var/nix/profiles/per-user/root/channels --set "$channel" --quiet
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fi
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mkdir -m 0700 -p $mountPoint/root/.nix-defexpr
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ln -sfn /nix/var/nix/profiles/per-user/root/channels $mountPoint/root/.nix-defexpr/channels
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# Mark the target as a NixOS installation, otherwise switch-to-configuration will chicken out.
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touch $mountPoint/etc/NIXOS
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