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installer: simplify the per-build installation

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The goal is to allow the installation and testing of arbitrary Nix
versions. Extend the base installer to accept a `--tarball-url-prefix
<url>` to change where the Nix tarball is getting downloaded from.

Once this is merged it should allow to:
1. Pick an evaluation at https://hydra.nixos.org/jobset/nix/master that
   looks healthy
2. Select the installedScript build and find the store path.

Now equipped with all of this, use an instance of nar-serve to fetch the
install script and release tarballs:

    curl -sfL https://nar-serve.numtide.com/nix/store/rkv4yh7pym941bhj0849zqdkg2546bdv-installer-script/install \
      | sh --tarball-url-prefix https://nar-serve.numtide.com/nix/store

Or with cachix, strip the /nix/store and derivation name and then:

    curl -sfL https://mycache.cachix.org/serve/rkv4yh7pym941bhj0849zqdkg2546bdv/install \
      | sh --tarball-url-prefix https://mycache.cachix.org/serve

Fixes #4047
This commit is contained in:
Jonas Chevalier 2020-11-06 11:53:00 +01:00
parent 4dcb183af3
commit 233b61d3d6
No known key found for this signature in database
GPG key ID: 71BAF6D40C1D63D7
3 changed files with 59 additions and 9 deletions
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19
flake.nix
View file

@ -324,9 +324,26 @@
''
mkdir -p $out/nix-support
# Converts /nix/store/50p3qk8kka9dl6wyq40vydq945k0j3kv-nix-2.4pre20201102_550e11f/bin/nix
# To 50p3qk8kka9dl6wyq40vydq945k0j3kv/bin/nix
tarballPath() {
# Remove the store prefix
local path=''${1#${builtins.storeDir}/}
# Get the path relative to the derivation root
local rest=''${path#*/}
# Get the derivation hash
local drvHash=''${path%%-*}
echo "$drvHash/$rest"
}
substitute ${./scripts/install.in} $out/install \
${pkgs.lib.concatMapStrings
(system: "--replace '@binaryTarball_${system}@' $(nix --experimental-features nix-command hash-file --base16 --type sha256 ${self.hydraJobs.binaryTarball.${system}}/*.tar.xz) ")
(system:
'' \
--replace '@tarballHash_${system}@' $(nix --experimental-features nix-command hash-file --base16 --type sha256 ${self.hydraJobs.binaryTarball.${system}}/*.tar.xz) \
--replace '@tarballPath_${system}@' $(tarballPath ${self.hydraJobs.binaryTarball.${system}}/*.tar.xz) \
''
)
[ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" ]
} \
--replace '@nixVersion@' ${version}

3
scripts/install-nix-from-closure.sh
View file

@ -98,6 +98,9 @@ while [ $# -gt 0 ]; do
echo ""
echo " --nix-extra-conf-file: Path to nix.conf to prepend when installing /etc/nix.conf"
echo ""
if [ -n "${INVOKED_FROM_INSTALL_IN:-}" ]; then
echo " --tarball-url-prefix URL: Base URL to download the Nix tarball from."
fi
) >&2
# darwin and Catalina+

46
scripts/install.in
View file

@ -25,18 +25,47 @@ require_util() {
}
case "$(uname -s).$(uname -m)" in
Linux.x86_64) system=x86_64-linux; hash=@binaryTarball_x86_64-linux@;;
Linux.i?86) system=i686-linux; hash=@binaryTarball_i686-linux@;;
Linux.aarch64) system=aarch64-linux; hash=@binaryTarball_aarch64-linux@;;
Darwin.x86_64) system=x86_64-darwin; hash=@binaryTarball_x86_64-darwin@;;
# eventually maybe: system=arm64-darwin; hash=@binaryTarball_arm64-darwin@;;
Darwin.arm64) system=x86_64-darwin; hash=@binaryTarball_x86_64-darwin@;;
Linux.x86_64)
hash=@tarballHash_x86_64-linux@
path=@tarballPath_x86_64-linux@
system=x86_64-linux
;;
Linux.i?86)
hash=@tarballHash_i686-linux@
path=@tarballPath_i686-linux@
system=i686-linux
;;
Linux.aarch64)
hash=@tarballHash_aarch64-linux@
path=@tarballPath_aarch64-linux@
system=aarch64-linux
;;
Darwin.x86_64)
hash=@tarballHash_x86_64-darwin@
path=@tarballPath_x86_64-darwin@
system=x86_64-darwin
;;
Darwin.arm64)
hash=@binaryTarball_x86_64-darwin@
path=@tarballPath_x86_64-darwin@
# eventually maybe: arm64-darwin
system=x86_64-darwin
;;
*) oops "sorry, there is no binary distribution of Nix for your platform";;
esac
url="https://releases.nixos.org/nix/nix-@nixVersion@/nix-@nixVersion@-$system.tar.xz"
# Use this command-line option to fetch the tarballs using nar-serve or Cachix
if "${1:---tarball-url-prefix}"; then
if [ -z "${2:-}" ]; then
oops "missing argument for --tarball-url-prefix"
fi
url=${2}/${path}
shift 2
else
url=https://releases.nixos.org/nix/nix-@nixVersion@/nix-@nixVersion@-$system.tar.xz
fi
tarball="$tmpDir/$(basename "$tmpDir/nix-@nixVersion@-$system.tar.xz")"
tarball=$tmpDir/nix-@nixVersion@-$system.tar.xz
require_util curl "download the binary tarball"
require_util tar "unpack the binary tarball"
@ -68,6 +97,7 @@ tar -xJf "$tarball" -C "$unpack" || oops "failed to unpack '$url'"
script=$(echo "$unpack"/*/install)
[ -e "$script" ] || oops "installation script is missing from the binary tarball!"
export INVOKED_FROM_INSTALL_IN=1
"$script" "$@"
} # End of wrapping