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(cherry picked from commit c9b3b8700d4cdf5c60d634785d14e1d49e7aa0f9)
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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/
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Part of: https://github.com/NixOS/nixpkgs/issues/108938
meta = with stdenv.lib;
is a widely used pattern. We want to slowly remove
the `stdenv.lib` indirection and encourage people
to use `lib` directly. Thus let’s start with the meta
field.
This used a rewriting script to mostly automatically
replace all occurances of this pattern, and add the
`lib` argument to the package header if it doesn’t
exist yet.
The script in its current form is available at
https://cs.tvl.fyi/depot@2f807d7f141068d2d60676a89213eaa5353ca6e0/-/blob/users/Profpatsch/nixpkgs-rewriter/default.nix
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This causes the script to be installed as `file-rename` instead of `rename` like
it is on other Unix systems. This in turn causes `wrapProgram` to fail when
building because it expects the wrapped program to be called `rename`.
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https://hydra.nixos.org/build/92527786
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https://www.perl.com/article/saying-goodbye-to-search-cpan-org/
maybe one operation less
..with unifying recursiveUpdate and first //
although not tested
fix whitespace
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