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Add rollback functionality in nix-on-droid

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This commit is contained in:
Tobias Happ 2019-11-27 22:22:05 +01:00 • committed by Alexander Sosedkin
parent 8ad0e40c2b
commit 41fca9b4e9
2 changed files with 72 additions and 20 deletions
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20
modules/build/activation.nix
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@ -8,6 +8,8 @@ with lib;
let
cfg = config.build;
profileDirectory = "/nix/var/nix/profiles/nix-on-droid";
# Programs that always should be available on the activation
# script's PATH.
activationBinPaths = lib.makeBinPath [
@ -108,13 +110,6 @@ in
internal = true;
description = "Package containing /etc files.";
};
profileDirectory = mkOption {
type = types.path;
readOnly = true;
internal = true;
description = "Path to nix-on-droid profile.";
};
};
};
@ -126,8 +121,13 @@ in
build = {
activationAfter.linkProfile = ''
generationDir="$(dirname "$(realpath $0)")"
$DRY_RUN_CMD nix-env --profile "${cfg.profileDirectory}" --set "$generationDir"
generationDir="$(dirname $0)"
if [[ $generationDir =~ ^${profileDirectory}-([0-9]+)-link$ ]]; then
$DRY_RUN_CMD nix-env --profile "${profileDirectory}" --switch-generation "''${BASH_REMATCH[1]}"
else
$DRY_RUN_CMD nix-env --profile "${profileDirectory}" --set "$generationDir"
fi
'';
activationPackage =
@ -151,8 +151,6 @@ in
ln --symbolic ${config.environment.binSh} $out/filesystem/bin/sh
ln --symbolic ${config.environment.usrBinEnv} $out/filesystem/usr/bin/env
'';
profileDirectory = "/nix/var/nix/profiles/nix-on-droid";
};
};