devenv-machines-rollback(1)

📦 version 2.4.0, in nixpkgs unstable

💅 devenv-machines-rollback — from the General Commands Manual 🎀

okay so bestie, real talk: this is devenv-machines-rollback, and it does exactly one iconic thing — it takes your transactional NixOS deployment and rolls it back to the previous system it recorded. like a lil undo button for your whole machine. no cap. ✨

🌸 NAME 🌸

devenv-machines-rollback — roll back a transactional NixOS deployment to its recorded previous system. that's it, that's the whole gig, and she ate 💅

🦋 SYNOPSIS 🦋

devenv machines rollback [--user-config] [--from] [-o|--override-input]
[-O|--option] [-j|--max-jobs] [-u|--cores] [-s|--system] [-i|--impure]
[--no-impure] [--offline] [--nix-option] [--nix-debugger] [-c|--clean]
[-P|--profile] [--reload] [--no-reload] [--shell] [--eval-cache]
[--no-eval-cache] [--refresh-eval-cache] [--refresh-task-cache]
[--secretspec-provider] [--secretspec-profile] [--trace-to]
[-v|--verbose] [-q|--quiet] [--tui] [--no-tui] [-h|--help] <NAME>

like yes, it's a lot of flags, but that's just how she is 🫶

💜 DESCRIPTION 💜

Roll back a transactional NixOS deployment to its recorded previous system.

literally what it says on the tin. highkey the most straightforward girl here 😌

⭐ OPTIONS ⭐

  • --user-config <USER_CONFIG> — use this user configuration file instead of the XDG default. (you're overruling the vibes-based default, respectfully 💅)
  • <NAME> — the NixOS machine to roll back. requires a recorded transactional deployment. no recorded deployment, no rollback, iykyk 🙈

🌈 INPUT OVERRIDES 🌈

💖 --from <FROM>

source for devenv.nix.

can be either a filesystem path (with a path: prefix) or a flake input reference.

Examples:

--from github:cachix/devenv
--from github:cachix/devenv?dir=examples/simple
--from path:/absolute/path/to/project
--from path:./relative/path

🧚 -o, --override-input <NAME> <URI>

override inputs in devenv.yaml.

Examples:

--override-input nixpkgs github:NixOS/nixpkgs/nixos-unstable
--override-input nixpkgs path:/path/to/local/nixpkgs

🍓 -O, --option <OPTION:TYPE> <VALUE>

override configuration options with typed values.

OPTION must include a type: <attribute>:<type>. supported types: string, int, float, bool, path, pkg, pkgs.

list types (pkgs) append to existing values by default. add a ! suffix to replace instead: pkgs! 💀 (yes the exclamation mark is the whole difference, stay woke)

Examples:

--option languages.rust.channel:string beta
--option services.postgres.enable:bool true
--option languages.python.version:string 3.10
--option packages:pkgs "ncdu git"       (appends to packages)
--option packages:pkgs! "ncdu git"      (replaces all packages)

🔥 NIX OPTIONS 🔥

  • -j, --max-jobs <MAX_JOBS> — maximum number of Nix builds to run concurrently. defaults to 1/4 of available CPU cores (minimum 1).
  • -u, --cores <CORES> — number of CPU cores available to each build. defaults to available cores divided by max-jobs (minimum 1).
  • -s, --system <SYSTEM> — override the target system. defaults to the host system (e.g. aarch64-darwin, x86_64-linux).
  • -i, --impure — relax the hermeticity of the environment. (she's a little unhinged, we love her)
  • --no-impure — force a hermetic environment, overriding config.
  • --offline — disable substituters and consider all previously downloaded files up-to-date.
  • --nix-option <NAME> <VALUE> — pass additional options to nix commands. these options are passed directly to Nix using the --option flag. see man nix.conf for the full list of available options.

Examples:

--nix-option sandbox false
--nix-option keep-outputs true
--nix-option system x86_64-darwin
  • --nix-debugger — enter the Nix debugger on failure. 😭 good luck bestie

🐚 SHELL OPTIONS 🐚

  • -c, --clean [<CLEAN>...] — ignore existing environment variables when entering the shell. pass a list of comma-separated environment variables to let through. (so basically a VIP list 🎀)
  • -P, --profile <PROFILES> — activate one or more profiles defined in devenv.nix. profiles allow you to define different configurations that can be merged with your base configuration.

see https://devenv.sh/profiles for more information.

Examples:

--profile python-3.14
--profile backend --profile fast-startup
  • --reload — enable auto-reload when config files change (default). ✨
  • --no-reload — disable auto-reload when config files change.
  • --shell <SHELL_TYPE> — shell to use for interactive sessions (bash, zsh, fish, nu).

Possible values:

  • bash
  • zsh
  • fish
  • nu

🎀 CACHE OPTIONS 🎀

  • --eval-cache — enable caching of Nix evaluation results (default).
  • --no-eval-cache — disable caching of Nix evaluation results.
  • --refresh-eval-cache — force a refresh of the Nix evaluation cache.
  • --refresh-task-cache — force a refresh of the task cache.

cache girls stay winning 💅

🔐 SECRETSPEC OPTIONS 🔐

  • --secretspec-provider <SECRETSPEC_PROVIDER> — override the secretspec provider.
  • --secretspec-profile <SECRETSPEC_PROFILE> — override the secretspec profile.

🦋 TRACING OPTIONS 🦋

👑 --trace-to <TRACE_TO>

enable tracing and set output destination(s). can be repeated for multiple outputs.

Syntax: [format:]destination

Examples:

--trace-to stderr                              # json to stderr
--trace-to pretty:stderr                       # pretty format to stderr
--trace-to json:file:/tmp/trace.json           # JSON to file
--trace-to otlp-grpc                           # OTLP gRPC to default endpoint
--trace-to otlp-grpc:http://collector:4317     # OTLP gRPC to custom endpoint

Multiple outputs:

--trace-to pretty:stderr --trace-to json:file:/tmp/t.json

Destinations: stdout, stderr, file:<path>, http(s)://<host>:<port>. Formats: json (default), pretty, full, otlp-grpc, otlp-http-protobuf, otlp-http-json.

when format is omitted, defaults to json. tracing is disabled by default.

[env: DEVENV_TRACE_TO=] (comma-separated) [env: DEVENV_TRACE_DEFAULT_TO=] (comma-separated, used only when no explicit tracing is configured; set to empty string to suppress)

ngl the env var situation is a whole mood but it's lowkey important — read it twice bestie 🫶

🌟 GLOBAL OPTIONS 🌟

  • -v, --verbose — enable additional debug logs. (she's telling you everything)
  • -q, --quiet — silence all logs. ✨ peace and quiet, we stan
  • --tui <TUI> — enable the interactive terminal interface (default when interactive).

Possible values:

  • true
  • false
  • --no-tui — disable the interactive terminal interface.
  • -h, --help — print help (see a summary with -h)

okay that's the whole page, go roll something back and slay 💖

big sparkly sign-off energy: this lil icon lives under the command name rollback and the manual page tag devenv-machines-rollback(1) — that's the source/version-and-date footer of this page, folded into a cute goodbye instead of a boring footer line. bye bestie, drink water 🧚‍♀️💜🍓

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