61b7cab481
Since 03eaa48 added perl.withPackages, there is a canonical way to
create a perl interpreter from a list of libraries, for use in script
shebangs or generic build inputs. This method is declarative (what we
are doing is clear), produces short shebangs[1] and needs not to wrap
existing scripts.
Unfortunately there are a few exceptions that I've found:
1. Scripts that are calling perl with the -T switch. This makes perl
ignore PERL5LIB, which is what perl.withPackages is using to inform
the interpreter of the library paths.
2. Perl packages that depends on libraries in their own path. This
is not possible because perl.withPackages works at build time. The
workaround is to add `-I $out/${perl.libPrefix}` to the shebang.
In all other cases I propose to switch to perl.withPackages.
[1]: https://lwn.net/Articles/779997/
95 lines
2.5 KiB
Nix
95 lines
2.5 KiB
Nix
# This module provides suggestions of packages to install if the user
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# tries to run a missing command in Bash. This is implemented using a
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# SQLite database that maps program names to Nix package names (e.g.,
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# "pdflatex" is mapped to "tetex").
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.programs.command-not-found;
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commandNotFound = pkgs.substituteAll {
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name = "command-not-found";
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dir = "bin";
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src = ./command-not-found.pl;
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isExecutable = true;
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inherit (cfg) dbPath;
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perl = pkgs.perl.withPackages (p: [ p.DBDSQLite p.StringShellQuote ]);
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};
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in
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{
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options.programs.command-not-found = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether interactive shells should show which Nix package (if
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any) provides a missing command.
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'';
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};
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dbPath = mkOption {
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default = "/nix/var/nix/profiles/per-user/root/channels/nixos/programs.sqlite" ;
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description = ''
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Absolute path to programs.sqlite.
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By default this file will be provided by your channel
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(nixexprs.tar.xz).
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'';
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type = types.path;
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};
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};
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config = mkIf cfg.enable {
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programs.bash.interactiveShellInit =
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''
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# This function is called whenever a command is not found.
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command_not_found_handle() {
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local p=${commandNotFound}/bin/command-not-found
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if [ -x $p -a -f ${cfg.dbPath} ]; then
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# Run the helper program.
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$p "$@"
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# Retry the command if we just installed it.
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if [ $? = 126 ]; then
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"$@"
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else
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return 127
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fi
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else
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echo "$1: command not found" >&2
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return 127
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fi
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}
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'';
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programs.zsh.interactiveShellInit =
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''
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# This function is called whenever a command is not found.
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command_not_found_handler() {
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local p=${commandNotFound}/bin/command-not-found
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if [ -x $p -a -f ${cfg.dbPath} ]; then
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# Run the helper program.
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$p "$@"
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# Retry the command if we just installed it.
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if [ $? = 126 ]; then
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"$@"
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else
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return 127
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fi
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else
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# Indicate than there was an error so ZSH falls back to its default handler
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echo "$1: command not found" >&2
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return 127
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fi
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}
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'';
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environment.systemPackages = [ commandNotFound ];
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};
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}
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