.\" -*- mode: troff; coding: utf-8 -*-
.TH "nix3-derivation-show" "1" ""
.RS
.PP
\fBWarning\fR 
.br
This program is
\fB\fBexperimental\fR\fR
and its interface is subject to change.
.RE
.SH Name
.LP
\f(CRnix derivation show\fR - show the contents of a store derivation
.SH Synopsis
.LP
\f(CRnix derivation show\fR [\fIoption\fR\[u2026]] \fIinstallables\fR\[u2026]
.SH Examples
.IP "\(bu" 3
Show the \fBstore derivation\fR that results from evaluating the Hello
package:
.LP
.EX
# nix derivation show nixpkgs#hello
{
\(dq/nix/store/s6rn4jz1sin56rf4qj5b5v8jxjm32hlk-hello-2.10.drv\(dq: {
  …
}
}
.EE
.IP "\(bu" 3
Show the full derivation graph (if available) that produced your
NixOS system:
.LP
.EX
# nix derivation show -r /run/current-system
.EE
.IP "\(bu" 3
Print all files fetched using \f(CRfetchurl\fR by Firefox\(cqs dependency
graph:
.LP
.EX
# nix derivation show -r nixpkgs#firefox \e
| jq -r '.[] | select(.outputs.out.hash and .env.urls) | .env.urls' \e
| uniq | sort
.EE
.IP
Note that \f(CR.outputs.out.hash\fR selects \fIfixed-output derivations\fR
(derivations that produce output with a specified content hash),
while \f(CR.env.urls\fR selects derivations with a \f(CRurls\fR attribute.
.SH Description
.LP
This command prints on standard output a JSON representation of the
\fBstore derivation\fRs to which \fB\fIinstallables\fR\fR evaluate.
.PP
Store derivations are used internally by Nix. They are store paths with
extension \f(CR.drv\fR that represent the build-time dependency graph to which
a Nix expression evaluates.
.PP
By default, this command only shows top-level derivations, but with
\f(CR--recursive\fR, it also shows their dependencies.
.PP
\f(CRnix derivation show\fR outputs a JSON map of \fBstore path\fRs to derivations in the following format:
.PP
{{#include ../../protocols/json/derivation.md}}
.SH Options
.IP "\(bu" 3
\fB\f(CR--recursive\fR\fR / \f(CR-r\fR
.IP
Include the dependencies of the specified derivations.
.IP "\(bu" 3
\fB\f(CR--stdin\fR\fR
.IP
Read installables from the standard input. No default installable applied.
.SS
Common evaluation options
.IP "\(bu" 3
\fB\f(CR--arg\fR\fR \fIname\fR \fIexpr\fR
.IP
Pass the value \fIexpr\fR as the argument \fIname\fR to Nix functions.
.IP "\(bu" 3
\fB\f(CR--arg-from-file\fR\fR \fIname\fR \fIpath\fR
.IP
Pass the contents of file \fIpath\fR as the argument \fIname\fR to Nix functions.
.IP "\(bu" 3
\fB\f(CR--arg-from-stdin\fR\fR \fIname\fR
.IP
Pass the contents of stdin as the argument \fIname\fR to Nix functions.
.IP "\(bu" 3
\fB\f(CR--argstr\fR\fR \fIname\fR \fIstring\fR
.IP
Pass the string \fIstring\fR as the argument \fIname\fR to Nix functions.
.IP "\(bu" 3
\fB\f(CR--debugger\fR\fR
.IP
Start an interactive environment if evaluation fails.
.IP "\(bu" 3
\fB\f(CR--eval-store\fR\fR \fIstore-url\fR
.IP
The \fBURL of the Nix store\fR
to use for evaluation, i.e. to store derivations (\f(CR.drv\fR files) and inputs referenced by them.
.IP "\(bu" 3
\fB\f(CR--impure\fR\fR
.IP
Allow access to mutable paths and repositories.
.IP "\(bu" 3
\fB\f(CR--include\fR\fR / \f(CR-I\fR \fIpath\fR
.IP
Add \fIpath\fR to search path entries used to resolve \fBlookup paths\fR
.IP
This option may be given multiple times.
.IP
Paths added through \f(CR-I\fR take precedence over the \fB\f(CRnix-path\fR configuration setting\fR and the \fB\f(CRNIX_PATH\fR environment variable\fR.
.IP "\(bu" 3
\fB\f(CR--override-flake\fR\fR \fIoriginal-ref\fR \fIresolved-ref\fR
.IP
Override the flake registries, redirecting \fIoriginal-ref\fR to \fIresolved-ref\fR.
.SS
Common flake-related options
.IP "\(bu" 3
\fB\f(CR--commit-lock-file\fR\fR
.IP
Commit changes to the flake\(cqs lock file.
.IP "\(bu" 3
\fB\f(CR--inputs-from\fR\fR \fIflake-url\fR
.IP
Use the inputs of the specified flake as registry entries.
.IP "\(bu" 3
\fB\f(CR--no-registries\fR\fR
.IP
Don\(cqt allow lookups in the flake registries.
.RS
.IP
\fBDEPRECATED\fR
.IP
Use \fB\f(CR--no-use-registries\fR\fR instead.
.RE
.IP "\(bu" 3
\fB\f(CR--no-update-lock-file\fR\fR
.IP
Do not allow any updates to the flake\(cqs lock file.
.IP "\(bu" 3
\fB\f(CR--no-write-lock-file\fR\fR
.IP
Do not write the flake\(cqs newly generated lock file.
.IP "\(bu" 3
\fB\f(CR--output-lock-file\fR\fR \fIflake-lock-path\fR
.IP
Write the given lock file instead of \f(CRflake.lock\fR within the top-level flake.
.IP "\(bu" 3
\fB\f(CR--override-input\fR\fR \fIinput-path\fR \fIflake-url\fR
.IP
Override a specific flake input (e.g. \f(CRdwarffs/nixpkgs\fR). This implies \f(CR--no-write-lock-file\fR.
.IP "\(bu" 3
\fB\f(CR--recreate-lock-file\fR\fR
.IP
Recreate the flake\(cqs lock file from scratch.
.RS
.IP
\fBDEPRECATED\fR
.IP
Use \fB\f(CRnix flake update\fR\fR instead.
.RE
.IP "\(bu" 3
\fB\f(CR--reference-lock-file\fR\fR \fIflake-lock-path\fR
.IP
Read the given lock file instead of \f(CRflake.lock\fR within the top-level flake.
.IP "\(bu" 3
\fB\f(CR--update-input\fR\fR \fIinput-path\fR
.IP
Update a specific flake input (ignoring its previous entry in the lock file).
.RS
.IP
\fBDEPRECATED\fR
.IP
Use \fB\f(CRnix flake update\fR\fR instead.
.RE
.SS
Logging-related options
.IP "\(bu" 3
\fB\f(CR--debug\fR\fR
.IP
Set the logging verbosity level to \(oqdebug\(cq.
.IP "\(bu" 3
\fB\f(CR--log-format\fR\fR \fIformat\fR
.IP
Set the format of log output; one of \f(CRraw\fR, \f(CRinternal-json\fR, \f(CRbar\fR or \f(CRbar-with-logs\fR.
.IP "\(bu" 3
\fB\f(CR--print-build-logs\fR\fR / \f(CR-L\fR
.IP
Print full build logs on standard error.
.IP "\(bu" 3
\fB\f(CR--quiet\fR\fR
.IP
Decrease the logging verbosity level.
.IP "\(bu" 3
\fB\f(CR--verbose\fR\fR / \f(CR-v\fR
.IP
Increase the logging verbosity level.
.SS
Miscellaneous global options
.IP "\(bu" 3
\fB\f(CR--help\fR\fR
.IP
Show usage information.
.IP "\(bu" 3
\fB\f(CR--offline\fR\fR
.IP
Disable substituters and consider all previously downloaded files up-to-date.
.IP "\(bu" 3
\fB\f(CR--option\fR\fR \fIname\fR \fIvalue\fR
.IP
Set the Nix configuration setting \fIname\fR to \fIvalue\fR (overriding \f(CRnix.conf\fR).
.IP "\(bu" 3
\fB\f(CR--refresh\fR\fR
.IP
Consider all previously downloaded files out-of-date.
.IP "\(bu" 3
\fB\f(CR--repair\fR\fR
.IP
During evaluation, rewrite missing or corrupted files in the Nix store. During building, rebuild missing or corrupted store paths.
.IP "\(bu" 3
\fB\f(CR--version\fR\fR
.IP
Show version information.
.SS
Options that change the interpretation of \fBinstallables\fR
.IP "\(bu" 3
\fB\f(CR--expr\fR\fR \fIexpr\fR
.IP
Interpret \fB\fIinstallables\fR\fR as attribute paths relative to the Nix expression \fIexpr\fR.
.IP "\(bu" 3
\fB\f(CR--file\fR\fR / \f(CR-f\fR \fIfile\fR
.IP
Interpret \fB\fIinstallables\fR\fR 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. Implies \f(CR--impure\fR.
.RS
.LP
\fBNote\fR
.PP
See \fB\f(CRman nix.conf\fR\fR for overriding configuration settings with command line flags.
.RE