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64 lines
2 KiB
Groff
64 lines
2 KiB
Groff
.TH nvd 1 2021-04-06 nvd "User Commands"
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.SH NAME
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nvd \- Nix/NixOS package version diff tool
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.SH SYNOPSIS
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.P
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.B nvd [ -h | --help ]
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.P
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.B nvd [ --color=(auto|always|never) ] root1 root2
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.SH DESCRIPTION
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.P
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.B nvd
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is a tool for diffing the versions of all store paths in the closures of two Nix
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store paths, neatly summarizing the differences. This is mainly intended for
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comparing two system configurations and is inspired by the output of
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.B emerge -pv
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from Gentoo's Portage package manager.
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.B nvd
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could also be likened to the output of Debian's
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.B apt upgrade -V,
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or any equivalent from other distributions' package managers.
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.B nvd
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isn't limited to comparing system configurations though, and can work with any
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two store paths.
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.P
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When given two system configurations,
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.B nvd
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distinguishes between packages that are explicitly included in
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.B environment.systemPackages,
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versus the rest of the packages that make up the system. The former packages
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are dubbed
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.I selected packages.
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.B nvd
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marks and bolds any selected packages it lists. Additionally,
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.B nvd
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reports on any changes to packages' selection states between the two
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configurations. This is done by looking at all packages that are referenced
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directly from the configurations' system paths, within each
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.I <system>/sw
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subdirectory. When either of the arguments isn't a system configuration,
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i.e. when either of the arguments is missing a
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.I sw
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subdirectory, then
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.I selected packages
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refer to direct dependencies of each of the arguments instead, and the
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comparison is still performed.
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.B nvd
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doesn't actually know if a Nix package represents a system configuration; it
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just uses the existence of a
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.I sw
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directory as a heuristic.
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.SH OPTIONS
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.P
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.TP
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-h, --help
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Displays a brief help message.
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.TP
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--color=(auto|always|never)
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When to display colour. The default
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.B auto
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detects whether stdout is a terminal and only uses colour if it is. Passing
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.B always
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forces colour to always be used, and passing
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.B never
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forces colour to never be used.
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