.\" -*- mode: troff; coding: utf-8 -*-
.TH "nix3-print-dev-env" "1" ""
.PP
\fBWarning\fR: This program is \fBexperimental\fR and its interface is subject to change.
.SH Name
\fCnix print-dev-env\fR - print shell code that can be sourced by bash to reproduce the build environment of a derivation
.SH Synopsis
\fCnix print-dev-env\fR [\fIoption\fR\[u2026]] \fIinstallable\fR
.SH Examples
.IP "\(bu" 2
Apply the build environment of GNU hello to the current shell:
.LP
.EX
# . <(nix print-dev-env nixpkgs#hello)
.EE
.IP "\(bu" 2
Get the build environment in JSON format:
.LP
.EX
# nix print-dev-env nixpkgs#hello --json
.EE
.IP
The output will look like this:
.LP
.EX
{
\(dqbashFunctions\(dq: {
  \(dqbuildPhase\(dq: \(dq \en    runHook preBuild;\en...\(dq,
  ...
},
\(dqvariables\(dq: {
  \(dqsrc\(dq: {
    \(dqtype\(dq: \(dqexported\(dq,
    \(dqvalue\(dq: \(dq/nix/store/3x7dwzq014bblazs7kq20p9hyzz0qh8g-hello-2.10.tar.gz\(dq
  },
  \(dqpostUnpackHooks\(dq: {
    \(dqtype\(dq: \(dqarray\(dq,
    \(dqvalue\(dq: [\(dq_updateSourceDateEpochFromSourceRoot\(dq]
  },
  ...
}
}
.EE
.SH Description
This command prints a shell script that can be sourced by \fCbash\fR and
that sets the variables and shell functions defined by the build
process of \fIinstallable\fR. This allows you to get a similar build
environment in your current shell rather than in a subshell (as with
\fCnix develop\fR).
.PP
With \fC--json\fR, the output is a JSON serialisation of the variables and
functions defined by the build process.
.SH Options
.IP "\(bu" 2
\fC--json\fR
.br
Produce output in JSON format, suitable for consumption by another program.
.IP "\(bu" 2
\fC--profile\fR \fIpath\fR
.br
The profile to update.
.IP "\(bu" 2
\fC--redirect\fR \fIinstallable\fR \fIoutputs-dir\fR
.br
Redirect a store path to a mutable location.
.LP
\fBCommon evaluation options:\fR
.IP "\(bu" 2
\fC--arg\fR \fIname\fR \fIexpr\fR
.br
Pass the value \fIexpr\fR as the argument \fIname\fR to Nix functions.
.IP "\(bu" 2
\fC--argstr\fR \fIname\fR \fIstring\fR
.br
Pass the string \fIstring\fR as the argument \fIname\fR to Nix functions.
.IP "\(bu" 2
\fC--eval-store\fR \fIstore-url\fR
.br
The Nix store to use for evaluations.
.IP "\(bu" 2
\fC--impure\fR
.br
Allow access to mutable paths and repositories.
.IP "\(bu" 2
\fC--include\fR / \fC-I\fR \fIpath\fR
.br
Add \fIpath\fR to the list of locations used to look up \fC<...>\fR file names.
.IP "\(bu" 2
\fC--override-flake\fR \fIoriginal-ref\fR \fIresolved-ref\fR
.br
Override the flake registries, redirecting \fIoriginal-ref\fR to \fIresolved-ref\fR.
.LP
\fBCommon flake-related options:\fR
.IP "\(bu" 2
\fC--commit-lock-file\fR
.br
Commit changes to the flake\[u2019]s lock file.
.IP "\(bu" 2
\fC--inputs-from\fR \fIflake-url\fR
.br
Use the inputs of the specified flake as registry entries.
.IP "\(bu" 2
\fC--no-registries\fR
.br
Don\[u2019]t allow lookups in the flake registries. This option is deprecated; use \fC--no-use-registries\fR.
.IP "\(bu" 2
\fC--no-update-lock-file\fR
.br
Do not allow any updates to the flake\[u2019]s lock file.
.IP "\(bu" 2
\fC--no-write-lock-file\fR
.br
Do not write the flake\[u2019]s newly generated lock file.
.IP "\(bu" 2
\fC--override-input\fR \fIinput-path\fR \fIflake-url\fR
.br
Override a specific flake input (e.g. \fCdwarffs/nixpkgs\fR). This implies \fC--no-write-lock-file\fR.
.IP "\(bu" 2
\fC--recreate-lock-file\fR
.br
Recreate the flake\[u2019]s lock file from scratch.
.IP "\(bu" 2
\fC--update-input\fR \fIinput-path\fR
.br
Update a specific flake input (ignoring its previous entry in the lock file).
.LP
\fBOptions that change the interpretation of installables:\fR
.IP "\(bu" 2
\fC--derivation\fR
.br
Operate on the store derivation rather than its outputs.
.IP "\(bu" 2
\fC--expr\fR \fIexpr\fR
.br
Interpret installables as attribute paths relative to the Nix expression \fIexpr\fR.
.IP "\(bu" 2
\fC--file\fR / \fC-f\fR \fIfile\fR
.br
Interpret installables as attribute paths relative to the Nix expression stored in \fIfile\fR. If \fIfile\fR is the character -, then a Nix expression will be read from standard input.