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nixos-rebuild: Add option for building and/or deploying on a remote host

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This commit adds the options --build-host and --target-host to nixos-rebuild.

--build-host instructs nixos-rebuild to perform all nix builds on the
specified host (via ssh). Build results are then copied back to the
local machine and used when activating the system.

--build-target instructs nixos-rebuild to activate the configuration
not on the local machine but on the specified remote host. Build
results are copied to the target machine and then activated there (via ssh).

It is possible to combine the usage of --build-host and --target-host,
in which case you can perform the build on one remote machine and deploy
the configuration to another remote machine. The only requirement is that
the build host has a working ssh connection to the target host (if the
target is not local), and that the local machine can connect to both
the target and the build host. Also, your user must be allowed to copy
nix closures between the local machine and the target and host machines.

At no point in time are the configuration sources (the nix files) copied
anywhere. Instead, nix evaluation always happens locally
(with nix-instantiate). The drv-file is then copied and realised remotely
(with nix-store).

As a convenience, if only --target-host is specified, --build-host is
implicitly set to that host too. So if you want to build locally and deploy
remotely you have to explicitly set "--build-host localhost".

To activate (test, boot or switch) you need to have root access to the
target host. You can specify this by "--target-host root@myhost".

I have tested the obvious scenarios and they are working. Some of the
combinations of --build-host and --target-host and the various actions might
not make much sense, and should maybe be forbidden (like setting a remote
target host when building a VM), and some combinations might not work at all.
This commit is contained in:
Rickard Nilsson 2015-11-26 14:44:49 +01:00
parent 35cf6c428f
commit ca0c460406
1 changed files with 160 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

187
nixos/modules/installer/tools/nixos-rebuild.sh
View file

@ -19,6 +19,8 @@ rollback=
upgrade=
repair=
profile=/nix/var/nix/profiles/system
buildHost=
targetHost=
while [ "$#" -gt 0 ]; do
i="$1"; shift 1
@ -73,6 +75,14 @@ while [ "$#" -gt 0 ]; do
fi
shift 1
;;
--build-host|h)
buildHost="$1"
shift 1
;;
--target-host|t)
targetHost="$1"
shift 1
;;
*)
echo "$0: unknown option \`$i'"
exit 1
@ -80,6 +90,90 @@ while [ "$#" -gt 0 ]; do
esac
done
if [ -z "$buildHost" -a -n "$targetHost" ]; then
buildHost="$targetHost"
fi
if [ "$targetHost" = localhost ]; then
targetHost=
fi
if [ "$buildHost" = localhost ]; then
buildHost=
fi
buildHostCmd() {
if [ -z "$buildHost" ]; then
"$@"
elif [ -n "$remoteNix" ]; then
ssh $SSHOPTS "$buildHost" PATH="$remoteNix:$PATH" "$@"
else
ssh $SSHOPTS "$buildHost" "$@"
fi
}
targetHostCmd() {
if [ -z "$targetHost" ]; then
"$@"
else
ssh $SSHOPTS "$targetHost" "$@"
fi
}
copyToTarget() {
if ! [ "$targetHost" = "$buildHost" ]; then
if [ -z "$targetHost" ]; then
NIX_SSHOPTS=$SSH_OPTS nix-copy-closure --from "$buildHost" "$1"
elif [ -z "$buildHost" ]; then
NIX_SSHOPTS=$SSH_OPTS nix-copy-closure --to "$targetHost" "$1"
else
buildHostCmd nix-copy-closure --to "$targetHost" "$1"
fi
fi
}
nixBuild() {
if [ -z "$buildHost" ]; then
nix-build "$@"
else
local instArgs=()
local buildArgs=()
while [ "$#" -gt 0 ]; do
local i="$1"; shift 1
case "$i" in
-o)
local out="$1"; shift 1
buildArgs+=("--add-root" "$out" "--indirect")
;;
-A)
local j="$1"; shift 1
instArgs+=("$i" "$j")
;;
-I)
# We don't want this in buildArgs
shift 1
;;
"<"*) # nix paths
instArgs+=("$i")
;;
*)
buildArgs+=("$i")
;;
esac
done
local drv="$(nix-instantiate "${instArgs[@]}" "${extraBuildFlags[@]}")"
if [ -a "$drv" ]; then
NIX_SSHOPTS=$SSH_OPTS nix-copy-closure --to "$buildHost" "$drv"
buildHostCmd nix-store -r "$drv" "${buildArgs[@]}"
else
echo "nix-instantiate failed"
exit 1
fi
fi
}
if [ -z "$action" ]; then showSyntax; fi
# Only run shell scripts from the Nixpkgs tree if the action is
@ -128,7 +222,16 @@ fi
tmpDir=$(mktemp -t -d nixos-rebuild.XXXXXX)
trap 'rm -rf "$tmpDir"' EXIT
SSHOPTS="$NIX_SSHOPTS -o ControlMaster=auto -o ControlPath=$tmpDir/ssh-%n -o ControlPersist=60"
cleanup() {
for ctrl in "$tmpDir"/ssh-*; do
ssh -o ControlPath="$ctrl" -O exit dummyhost 2>/dev/null || true
done
rm -rf "$tmpDir"
}
trap cleanup EXIT
# If the Nix daemon is running, then use it. This allows us to use
@ -150,30 +253,56 @@ if [ -n "$rollback" -o "$action" = dry-build ]; then
buildNix=
fi
prebuiltNix() {
machine="$1"
if [ "$machine" = x86_64 ]; then
return /nix/store/xryr9g56h8yjddp89d6dw12anyb4ch7c-nix-1.10
elif [[ "$machine" =~ i.86 ]]; then
return /nix/store/2w92k5wlpspf0q2k9mnf2z42prx3bwmv-nix-1.10
else
echo "$0: unsupported platform"
exit 1
fi
}
remotePATH=
if [ -n "$buildNix" ]; then
echo "building Nix..." >&2
if ! nix-build '<nixpkgs/nixos>' -A config.nix.package -o $tmpDir/nix "${extraBuildFlags[@]}" > /dev/null; then
if ! nix-build '<nixpkgs/nixos>' -A nixFallback -o $tmpDir/nix "${extraBuildFlags[@]}" > /dev/null; then
if ! nix-build '<nixpkgs>' -A nix -o $tmpDir/nix "${extraBuildFlags[@]}" > /dev/null; then
machine="$(uname -m)"
if [ "$machine" = x86_64 ]; then
nixStorePath=/nix/store/xryr9g56h8yjddp89d6dw12anyb4ch7c-nix-1.10
elif [[ "$machine" =~ i.86 ]]; then
nixStorePath=/nix/store/2w92k5wlpspf0q2k9mnf2z42prx3bwmv-nix-1.10
else
echo "$0: unsupported platform"
exit 1
fi
nixDrv=
if ! nixDrv="$(nix-instantiate '<nixpkgs/nixos>' --add-root $tmpDir/nixdrv --indirect -A config.nix.package "${extraBuildFlags[@]}")"; then
if ! nixDrv="$(nix-instantiate '<nixpkgs/nixos>' --add-root $tmpDir/nixdrv --indirect -A nixFallback "${extraBuildFlags[@]}")"; then
if ! nixDrv="$(nix-instantiate '<nixpkgs>' --add-root $tmpDir/nixdrv --indirect -A nix "${extraBuildFlags[@]}")"; then
nixStorePath="$(prebuiltNix "$(uname -m)")"
if ! nix-store -r $nixStorePath --add-root $tmpDir/nix --indirect \
--option extra-binary-caches https://cache.nixos.org/; then
echo "warning: don't know how to get latest Nix" >&2
fi
# Older version of nix-store -r don't support --add-root.
[ -e $tmpDir/nix ] || ln -sf $nixStorePath $tmpDir/nix
if [ -n "$buildHost" ]; then
remoteNixStorePath="$(prebuiltNix "$(buildHostCmd uname -m)")"
remoteNix="$remoteNixStorePath/bin"
if ! buildHostCmd nix-store -r $remoteNixStorePath \
--option extra-binary-caches https://cache.nixos.org/ >/dev/null; then
remoteNix=
echo "warning: don't know how to get latest Nix" >&2
fi
fi
fi
fi
fi
PATH=$tmpDir/nix/bin:$PATH
if [ -a "$nixDrv" ]; then
nix-store -r "$nixDrv" --add-root $tmpDir/nix --indirect >/dev/null
if [ -n "$buildHost" ]; then
nix-copy-closure --to "$buildHost" "$nixDrv"
# The nix build produces multiple outputs, we add them all to the remote path
for p in $(buildHostCmd nix-store -r "$(readlink "$nixDrv")" "${buildArgs[@]}"); do
remoteNix="$remoteNix${remoteNix:+:}$p/bin"
done
fi
fi
PATH="$tmpDir/nix/bin:$PATH"
fi
@ -200,31 +329,35 @@ fi
if [ -z "$rollback" ]; then
echo "building the system configuration..." >&2
if [ "$action" = switch -o "$action" = boot ]; then
nix-env "${extraBuildFlags[@]}" -p "$profile" -f '<nixpkgs/nixos>' --set -A system
pathToConfig="$profile"
pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A system "${extraBuildFlags[@]}")"
copyToTarget "$pathToConfig"
targetHostCmd nix-env -p "$profile" --set "$pathToConfig"
elif [ "$action" = test -o "$action" = build -o "$action" = dry-build -o "$action" = dry-activate ]; then
nix-build '<nixpkgs/nixos>' -A system -k "${extraBuildFlags[@]}" > /dev/null
pathToConfig=./result
pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A system -k "${extraBuildFlags[@]}")"
elif [ "$action" = build-vm ]; then
nix-build '<nixpkgs/nixos>' -A vm -k "${extraBuildFlags[@]}" > /dev/null
pathToConfig=./result
pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A vm -k "${extraBuildFlags[@]}")"
elif [ "$action" = build-vm-with-bootloader ]; then
nix-build '<nixpkgs/nixos>' -A vmWithBootLoader -k "${extraBuildFlags[@]}" > /dev/null
pathToConfig=./result
pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A vmWithBootLoader -k "${extraBuildFlags[@]}")"
else
showSyntax
fi
# Copy build to target host if we haven't already done it
if ! [ "$action" = switch -o "$action" = boot ]; then
copyToTarget "$pathToConfig"
fi
else # [ -n "$rollback" ]
if [ "$action" = switch -o "$action" = boot ]; then
nix-env --rollback -p "$profile"
targetHostCmd nix-env --rollback -p "$profile"
pathToConfig="$profile"
elif [ "$action" = test -o "$action" = build ]; then
systemNumber=$(
nix-env -p "$profile" --list-generations |
targetHostCmd nix-env -p "$profile" --list-generations |
sed -n '/current/ {g; p;}; s/ *\([0-9]*\).*/\1/; h'
)
ln -sT "$profile"-${systemNumber}-link ./result
pathToConfig=./result
pathToConfig="$profile"-${systemNumber}-link
if [ -z "$targetHost" ]; then
ln -sT "$pathToConfig" ./result
fi
else
showSyntax
fi
@ -234,7 +367,7 @@ fi
# If we're not just building, then make the new configuration the boot
# default and/or activate it now.
if [ "$action" = switch -o "$action" = boot -o "$action" = test -o "$action" = dry-activate ]; then
if ! $pathToConfig/bin/switch-to-configuration "$action"; then
if ! targetHostCmd $pathToConfig/bin/switch-to-configuration "$action"; then
echo "warning: error(s) occurred while switching to the new configuration" >&2
exit 1
fi