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nixpkgs/installer/nixos-rebuild.sh
Marc Weber d438b972b1 nixos-rebuild: take NIXPKGS location from env, too
svn path=/nixos/trunk/; revision=12981
2008-10-06 23:23:28 +00:00

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#! @shell@ -e
# Allow the location of NixOS sources and the system configuration
# file to be overridden.
NIXOS=${NIXOS:-@defaultNIXOS@}
NIXPKGS=${NIXPKGS:-@defaultNIXPKGS@}
NIXOS_CONFIG=${NIXOS_CONFIG:-/etc/nixos/configuration.nix}
export NIXPKGS # must be exported so that a non default location is passed to nixos/default.nix
showSyntax() {
# !!! more or less cut&paste from
# system/switch-to-configuration.sh (which we call, of course).
cat <<EOF
Usage: $0 [switch|boot|test|build|dry-run]
switch: make the configuration the boot default and activate now
boot: make the configuration the boot default
test: activate the configuration, but don't make it the boot default
build: build the configuration, but don't make it the default or
activate it
dry-run: just show what store paths would be built/downloaded
Environment variables affecting nixos-rebuild:
Path to NixOS: NIXOS=${NIXOS}
Path to Nixpkgs: NIXPKGS=${NIXPKGS}
Path to configuration: NIXOS_CONFIG=${NIXOS_CONFIG}
EOF
exit 1
}
# Parse the command line.
extraBuildFlags=
action=
for i in "$@"; do
if test "$i" = "--help"; then
showSyntax
elif test "$i" = switch -o "$i" = boot -o "$i" = test -o "$i" = build -o "$i" = dry-run; then
action="$i"
else
echo "$0: unknown option \`$i'"
exit 1
fi
done
if test -z "$action"; then showSyntax; fi
if test "$action" = dry-run; then
extraBuildFlags="$extraBuildFlags --dry-run"
fi
# If the Nix daemon is running, then use it. This allows us to use
# the latest Nix from Nixpkgs (below) for expression evaluation, while
# still using the old Nix (via the daemon) for actual store access.
# This matters if the new Nix in Nixpkgs has a schema change. It
# would upgrade the schema, which should only happen once we actually
# switch to the new configuration.
if initctl status nix-daemon 2>&1 | grep -q ' running'; then
export NIX_REMOTE=${NIX_REMOTE:-daemon}
fi
# Pull the manifests defined in the configuration (the "manifests"
# attribute). Wonderfully hacky.
if test "${NIXOS_PULL:-1}" != 0; then
manifests=$(nix-instantiate --eval-only --xml --strict $NIXOS -A manifests \
| grep '<string' | sed 's^.*"\(.*\)".*^\1^g')
mkdir -p /nix/var/nix/channel-cache
for i in $manifests; do
NIX_DOWNLOAD_CACHE=/nix/var/nix/channel-cache nix-pull $i || true
done
fi
# First build Nix, since NixOS may require a newer version than the
# current one. Of course, the same goes for Nixpkgs, but Nixpkgs is
# more conservative.
if test "${NIXOS_BUILD_NIX:-1}" != 0; then
if ! nix-build $NIXOS -A nixFallback -o $HOME/nix-tmp; then
nix-build $NIXPKGS -A nixUnstable -o $HOME/nix-tmp
fi
PATH=$HOME/nix-tmp/bin:$PATH
fi
# Either upgrade the configuration in the system profile (for "switch"
# or "boot"), or just build it and create a symlink "result" in the
# current directory (for "build" and "test").
if test "$action" = switch -o "$action" = boot; then
nix-env -p /nix/var/nix/profiles/system -f $NIXOS --set -A system $extraBuildFlags
pathToConfig=/nix/var/nix/profiles/system
elif test "$action" = test -o "$action" = build -o "$action" = dry-run; then
nix-build $NIXOS -A system -K -k $extraBuildFlags
pathToConfig=./result
else
showSyntax
fi
# If we're not just building, then make the new configuration the boot
# default and/or activate it now.
if test "$action" = switch -o "$action" = boot -o "$action" = test; then
$pathToConfig/bin/switch-to-configuration "$action"
fi
if test "$action" = "test"; then
cat >&2 <<EOF
Warning: if you remove or overwrite the symlink \`$pathToConfig', the
active system configuration may be garbage collected! This may render
the system inoperable (though a reboot will fix things).
EOF
fi
rm -f $HOME/nix-tmp