imagemagick cannot convert from pdf to png

[romildo]

Issue description

With imagemagick installed in the NixOS unstable, convertion from PDF to PNG (or other image formats) fails because gs cannot be found:

$ convert /tmp/a.pdf /tmp/b.png
convert: no images defined `/tmp/b.png' @ error/convert.c/ConvertImageCommand/3252.

$ locate -r bin/gs$
/nix/store/45iygd09ig723zczx4ys0mxr03sgfg4i-ghostscript-9.18/bin/gs
/nix/store/c0q1dq2ahhsig95a9c5gwis29rzwmzg3-cups-progs/bin/gs

$ export PATH=/nix/store/45iygd09ig723zczx4ys0mxr03sgfg4i-ghostscript-9.18/bin:$PATH

$ convert /tmp/a.pdf /tmp/b.png

$ ls /tmp/b.png
/tmp/b.png

Probably imagemagick needs a propagated runtime dependency on ghostscript.

Technical details

• System: (NixOS: nixos-version, Ubuntu/Fedora: lsb_release -a, ...)
  16.09pre85639.453086a (Flounder)
• Nix version: (run nix-env --version)
  nix-env (Nix) 1.11.2
• Nixpkgs version: (run nix-instantiate --eval '<nixpkgs>' -A lib.nixpkgsVersion)
  "16.09pre85639.453086a"

[romildo]

cc @the-kenny @wkennington

[the-kenny]

Do we really want to pull ghostscript into the closure for imagemagick? It's a pretty big dependency.

[the-kenny]

Workaround: Install ghostscript to your system or your profile manually.

[vrthra]

Doesn't imagemagicBig have ghostscript?

[the-kenny]

Right, it has.

[romildo]

imagemagickBig is not in the binary cache, right?

[domenkozar]

http://hydra.nixos.org/search?query=imagemagickBig

[vcunat]

It should be. It's even used as dependency for ikiwiki.

[romildo]

For some reason imagemagick is being compiled from source on my unstable system (x86_64-linux) when I add imamagickBig on environment.systemPackages. I expected it to be fetched from the binary cache.

# nixos-version
16.09pre85639.453086a (Flounder)

# nixos-rebuild switch 2>&1 | tee /var/tmp/nix-rebuild.log
building Nix...
building the system configuration...
these derivations will be built:
  /nix/store/czvm39vhzimsds7h69zmvnkpyi6byzzl-imagemagick-6.9.3-9.drv
  /nix/store/xw7rj6ydbggr27bc3lbkb2gblj4pcqms-system-path.drv
  /nix/store/m51dfadnz79fhapiawb3771nqk4gh812-xsession.drv
  /nix/store/lvdjxxjvcs8m9nxlwfs3bwc4sn3lqacs-desktops.drv
  /nix/store/1m4fjn6cyacci0s4ir3spd2xzh03w7s7-lightdm.conf.drv
  /nix/store/ylgjgvkp50qbysa78zv0bx5j8mjrddw0-dbus-conf.drv
  /nix/store/xzqq8hppp5smqy85cy7pzgkwmypwmfwc-unit-dbus.service.drv
  /nix/store/ymrs9va8siz5p7dh192mvc3kraw3hcg0-unit-polkit.service.drv
  /nix/store/xag3l95j6z49m2q5fp67ykha5mzjh70m-system-units.drv
  /nix/store/fdkjvwingy8p6fsqwnfi86xcq45szkbq-unit-emacs.service.drv
  /nix/store/xsrixq1656h4mzx51i0ab097jmvfmddx-user-units.drv
  /nix/store/asp2ldc15c7lam00b5456clyp5vpjzgf-etc.drv
  /nix/store/a5i2ykj8dsg3lm0jxv25xf4ww1d3x4cc-nixos-system-jrm.no-ip.org-16.09pre85639.453086a.drv
these paths will be fetched (8.38 MiB download, 8.40 MiB unpacked):
  /nix/store/fz049636n3zak05c6jwdvz135iy2w2r4-ImageMagick-6.9.3-9.tar.xz
  /nix/store/x8zsjkxzi6xy3vyasfy93zl7c4g2kbyl-stage-2-init.sh
  /nix/store/zwcvckg82fc7spbjnip73pynxr5pz5xc-stdenv
fetching path ‘/nix/store/x8zsjkxzi6xy3vyasfy93zl7c4g2kbyl-stage-2-init.sh’...
fetching path ‘/nix/store/zwcvckg82fc7spbjnip73pynxr5pz5xc-stdenv’...
fetching path ‘/nix/store/fz049636n3zak05c6jwdvz135iy2w2r4-ImageMagick-6.9.3-9.tar.xz’...
[...]
building path(s) ‘/nix/store/f1ys84ax50sc7zfc48i3p3jpipl7fwf1-imagemagick-6.9.3-9-dev’, ‘/nix/store/psgzqab3bspd00swj3ls996j2yxlah47-imagemagick-6.9.3-9’, ‘/nix/store/rda3ylzgkkqzdcdzjjh4y0diz6zf5dfd-imagemagick-6.9.3-9-doc’
unpacking sources
[...]

$ find /nix/store -maxdepth 1 -ls | grep -vE '\.drv|tar.xz$' | grep --color -i imagemagick
     2660      4 dr-xr-xr-x   3  root     root         4096 Dec 31  1969 /nix/store/rda3ylzgkkqzdcdzjjh4y0diz6zf5dfd-imagemagick-6.9.3-9-doc
     4498      4 dr-xr-xr-x   6  root     root         4096 Dec 31  1969 /nix/store/f1ys84ax50sc7zfc48i3p3jpipl7fwf1-imagemagick-6.9.3-9-dev
      762      4 dr-xr-xr-x   6  root     root         4096 Dec 31  1969 /nix/store/psgzqab3bspd00swj3ls996j2yxlah47-imagemagick-6.9.3-9

@vcunat Edited to show the output of nixos-rebuild.

[vcunat]

With current nixos-unstable (453086a), all outputs get fetched OK on my computer (x86_64-linux). /nix/store/pl7dbl8d38lv7pxc7sfcdn08md9dn943-imagemagick-6.9.3-9 in particular, to check hashes.

[Profpatsch]

Since there is imagemagickBig, I’ll close.