Re: How do I build a derivation with guix build?
Hello, Le samedi 05 septembre 2020 à 22:40 -0400, Timothy Sample a écrit : > As I understand it, ‘gexp->derivation’ returns a value in the store > monad. I’m not sure why ‘guix build’ doesn’t know how to use it > directly, but you can get at the derivation by wrapping it with > ‘run-with-store’: > > (run-with-store (open-connection) > (gexp->derivation "the-thing" build-exp)) > > Don’t forget to use the ‘(guix store)’ module for this. OK, I think I understand: "you exit a monad like you exit a building on fire: by running" So, I cannot simply return a monadic value to guix build. It needs a real value. > > But! There’s a better way!! :) > > You can use the “declarative interface”. Just replace > ‘gexp->derivation’ with ‘computed-file’: > > (computed-file "the-thing" build-exp) > > Now there’s no need for ‘(guix store)’. Thank you, that was exactly what I was looking for! divoplade
Re: How do I build a derivation with guix build?
Hi divoplade, As I understand it, ‘gexp->derivation’ returns a value in the store monad. I’m not sure why ‘guix build’ doesn’t know how to use it directly, but you can get at the derivation by wrapping it with ‘run-with-store’: (run-with-store (open-connection) (gexp->derivation "the-thing" build-exp)) Don’t forget to use the ‘(guix store)’ module for this. But! There’s a better way!! :) You can use the “declarative interface”. Just replace ‘gexp->derivation’ with ‘computed-file’: (computed-file "the-thing" build-exp) Now there’s no need for ‘(guix store)’. HTH! -- Tim divoplade writes: > Hello, > > I am still learning how to use gexps, and I thought that running this > would work: > > guix build -f example.scm > > with example.scm containing: > > (use-modules (gnu packages base)) > (use-modules (guix gexp)) > > (define build-exp > #~(begin > (mkdir #$output) > (chdir #$output) > (symlink (string-append #$coreutils "/bin/ls") >"list-files"))) > > (gexp->derivation "the-thing" build-exp) > > This is a copy of what's on the manual for explaining G-expressions. > > The guix build -f command should, according to the --help output: > "build the package or derivation that the code within FILE evaluates > to" > > However, I get an exception, "Wrong number of arguments to # 7f775f854f00 at guix/gexp.scm:1064:2 (state)>", after a backtrace that > does not even contains example.scm. > > What is going on? How do you build the derivation? > > Best regards, > > divoplade
How do I build a derivation with guix build?
Hello, I am still learning how to use gexps, and I thought that running this would work: guix build -f example.scm with example.scm containing: (use-modules (gnu packages base)) (use-modules (guix gexp)) (define build-exp #~(begin (mkdir #$output) (chdir #$output) (symlink (string-append #$coreutils "/bin/ls") "list-files"))) (gexp->derivation "the-thing" build-exp) This is a copy of what's on the manual for explaining G-expressions. The guix build -f command should, according to the --help output: "build the package or derivation that the code within FILE evaluates to" However, I get an exception, "Wrong number of arguments to #", after a backtrace that does not even contains example.scm. What is going on? How do you build the derivation? Best regards, divoplade