Hi Ludo, > Sounds like the right approach, would you like to test it? :-)
In principle yes, but even without the patch I get (using current master): $ ./pre-inst-env guix challenge gdk-pixbuf --substitute-urls="https://mirror.hydra.gnu.org https://bayfront.guixsd.org" ... Backtrace: In unknown file: ?: 19 [apply-smob/1 #<catch-closure 233fde0>] In ice-9/boot-9.scm: 66: 18 [call-with-prompt prompt0 ...] In ice-9/eval.scm: 432: 17 [eval # #] In ice-9/boot-9.scm: 2404: 16 [save-module-excursion #<procedure 235f900 at ice-9/boot-9.scm:4051:3 ()>] 4056: 15 [#<procedure 235f900 at ice-9/boot-9.scm:4051:3 ()>] 1727: 14 [%start-stack load-stack ...] 1732: 13 [#<procedure 2373b10 ()>] In unknown file: ?: 12 [primitive-load "/x/home/dannym/src/guix-master/guix/scripts/guix"] In guix/ui.scm: 1228: 11 [run-guix-command challenge "gdk-pixbuf" ...] In ice-9/boot-9.scm: 160: 10 [catch srfi-34 #<procedure 2a91220 at guix/ui.scm:432:2 ()> ...] 160: 9 [catch system-error ...] 160: 8 [catch system-error ...] In guix/scripts/challenge.scm: 238: 7 [#<procedure 2af1390 at guix/scripts/challenge.scm:224:6 ()>] In guix/store.scm: 1223: 6 [run-with-store # ...] In guix/scripts/challenge.scm: 239: 5 [#<procedure 757dcf0 at guix/scripts/challenge.scm:239:15 (state)> #] 123: 4 [#<procedure 88effc0 at guix/scripts/challenge.scm:123:2 (state)> #] In srfi/srfi-1.scm: 643: 3 [append-map #<procedure 74335a0 at guix/scripts/challenge.scm:125:46 (t-1367901)> ...] 575: 2 [map #<procedure 74335a0 at guix/scripts/challenge.scm:125:46 (t-1367901)> ...] In guix/scripts/substitute.scm: 687: 1 [lookup-narinfos "\"https://mirror.hydra.gnu.org" #] 659: 0 [fetch-narinfos "\"https://mirror.hydra.gnu.org" #] guix/scripts/substitute.scm:659:16: In procedure fetch-narinfos: guix/scripts/substitute.scm:659:16: In procedure struct_vtable: Wrong type argument in position 1 (expecting struct): #f