treewide: Per RFC45, remove all unquoted URLs

3 files changed, 298 insertions, 298 deletions

diff --git a/pkgs/build-support/fetchmavenartifact/default.nix b/pkgs/build-support/fetchmavenartifact/default.nix
index dc48a312fb3..d7ad406943b 100644
--- a/pkgs/build-support/fetchmavenartifact/default.nix
+++ b/pkgs/build-support/fetchmavenartifact/default.nix
@@ -3,10 +3,10 @@
 { fetchurl, stdenv }:
 let
   defaultRepos = [
-    http://central.maven.org/maven2
-    http://oss.sonatype.org/content/repositories/releases
-    http://oss.sonatype.org/content/repositories/public
-    http://repo.typesafe.com/typesafe/releases
+    "http://central.maven.org/maven2"
+    "http://oss.sonatype.org/content/repositories/releases"
+    "http://oss.sonatype.org/content/repositories/public"
+    "http://repo.typesafe.com/typesafe/releases"
   ];
 in
 
diff --git a/pkgs/build-support/fetchurl/mirrors.nix b/pkgs/build-support/fetchurl/mirrors.nix
index a0a61f7cc50..4e8b0aa99a8 100644
--- a/pkgs/build-support/fetchurl/mirrors.nix
+++ b/pkgs/build-support/fetchurl/mirrors.nix
@@ -2,316 +2,316 @@
 
   # Content-addressable Nix mirrors.
   hashedMirrors = [
-    http://tarballs.nixos.org
+    "http://tarballs.nixos.org"
   ];
 
   # Mirrors for mirror://site/filename URIs, where "site" is
   # "sourceforge", "gnu", etc.
 
   luarocks = [
-    https://luarocks.org
-    https://raw.githubusercontent.com/rocks-moonscript-org/moonrocks-mirror/master/
-    http://luafr.org/moonrocks
-    http://luarocks.logiceditor.com/rocks
+    "https://luarocks.org"
+    "https://raw.githubusercontent.com/rocks-moonscript-org/moonrocks-mirror/master/"
+    "http://luafr.org/moonrocks"
+    "http://luarocks.logiceditor.com/rocks"
   ];
 
   # SourceForge.
   sourceforge = [
-    https://downloads.sourceforge.net/
-    https://prdownloads.sourceforge.net/
-    https://heanet.dl.sourceforge.net/sourceforge/
-    https://surfnet.dl.sourceforge.net/sourceforge/
-    https://dfn.dl.sourceforge.net/sourceforge/
-    https://osdn.dl.sourceforge.net/sourceforge/
-    https://kent.dl.sourceforge.net/sourceforge/
+    "https://downloads.sourceforge.net/"
+    "https://prdownloads.sourceforge.net/"
+    "https://heanet.dl.sourceforge.net/sourceforge/"
+    "https://surfnet.dl.sourceforge.net/sourceforge/"
+    "https://dfn.dl.sourceforge.net/sourceforge/"
+    "https://osdn.dl.sourceforge.net/sourceforge/"
+    "https://kent.dl.sourceforge.net/sourceforge/"
   ];
 
   # OSDN (formerly SourceForge.jp).
   osdn = [
-    https://osdn.dl.osdn.jp/
-    https://osdn.mirror.constant.com/
-    https://mirrors.gigenet.com/OSDN/
-    https://osdn.dl.sourceforge.jp/
-    https://jaist.dl.sourceforge.jp/
+    "https://osdn.dl.osdn.jp/"
+    "https://osdn.mirror.constant.com/"
+    "https://mirrors.gigenet.com/OSDN/"
+    "https://osdn.dl.sourceforge.jp/"
+    "https://jaist.dl.sourceforge.jp/"
   ];
 
   # GNU (https://www.gnu.org/prep/ftp.html).
   gnu = [
     # This one redirects to a (supposedly) nearby and (supposedly) up-to-date
     # mirror.
-    https://ftpmirror.gnu.org/
+    "https://ftpmirror.gnu.org/"
 
-    http://ftp.nluug.nl/pub/gnu/
-    http://mirrors.kernel.org/gnu/
-    ftp://mirror.cict.fr/gnu/
-    ftp://ftp.cs.tu-berlin.de/pub/gnu/
-    ftp://ftp.chg.ru/pub/gnu/
-    ftp://ftp.funet.fi/pub/mirrors/ftp.gnu.org/gnu/
+    "http://ftp.nluug.nl/pub/gnu/"
+    "http://mirrors.kernel.org/gnu/"
+    "ftp://mirror.cict.fr/gnu/"
+    "ftp://ftp.cs.tu-berlin.de/pub/gnu/"
+    "ftp://ftp.chg.ru/pub/gnu/"
+    "ftp://ftp.funet.fi/pub/mirrors/ftp.gnu.org/gnu/"
 
     # This one is the master repository, and thus it's always up-to-date.
-    http://ftp.gnu.org/pub/gnu/
+    "http://ftp.gnu.org/pub/gnu/"
   ];
 
   # GCC.
   gcc = [
-    https://bigsearcher.com/mirrors/gcc/
-    http://mirror.koddos.net/gcc/
-    ftp://ftp.nluug.nl/mirror/languages/gcc/
-    ftp://ftp.fu-berlin.de/unix/languages/gcc/
-    ftp://ftp.irisa.fr/pub/mirrors/gcc.gnu.org/gcc/
-    ftp://gcc.gnu.org/pub/gcc/
+    "https://bigsearcher.com/mirrors/gcc/"
+    "http://mirror.koddos.net/gcc/"
+    "ftp://ftp.nluug.nl/mirror/languages/gcc/"
+    "ftp://ftp.fu-berlin.de/unix/languages/gcc/"
+    "ftp://ftp.irisa.fr/pub/mirrors/gcc.gnu.org/gcc/"
+    "ftp://gcc.gnu.org/pub/gcc/"
   ];
 
   # GnuPG.
   gnupg = [
-    https://gnupg.org/ftp/gcrypt/
-    http://www.ring.gr.jp/pub/net/
-    http://gd.tuwien.ac.at/privacy/
-    http://mirrors.dotsrc.org/gcrypt/
-    http://ftp.heanet.ie/mirrors/ftp.gnupg.org/gcrypt/
-    http://www.mirrorservice.org/sites/ftp.gnupg.org/gcrypt/
+    "https://gnupg.org/ftp/gcrypt/"
+    "http://www.ring.gr.jp/pub/net/"
+    "http://gd.tuwien.ac.at/privacy/"
+    "http://mirrors.dotsrc.org/gcrypt/"
+    "http://ftp.heanet.ie/mirrors/ftp.gnupg.org/gcrypt/"
+    "http://www.mirrorservice.org/sites/ftp.gnupg.org/gcrypt/"
   ];
 
   # kernel.org's /pub (/pub/{linux,software}) tree.
   kernel = [
-    http://cdn.kernel.org/pub/
-    http://www.all.kernel.org/pub/
-    http://ramses.wh2.tu-dresden.de/pub/mirrors/kernel.org/
-    http://linux-kernel.uio.no/pub/
-    http://kernel.osuosl.org/pub/
-    ftp://ftp.funet.fi/pub/mirrors/ftp.kernel.org/pub/
+    "http://cdn.kernel.org/pub/"
+    "http://www.all.kernel.org/pub/"
+    "http://ramses.wh2.tu-dresden.de/pub/mirrors/kernel.org/"
+    "http://linux-kernel.uio.no/pub/"
+    "http://kernel.osuosl.org/pub/"
+    "ftp://ftp.funet.fi/pub/mirrors/ftp.kernel.org/pub/"
   ];
 
   # Mirrors from https://download.kde.org/extra/download-mirrors.html
   kde = [
     "https://download.kde.org/download.php?url="
-    https://ftp.gwdg.de/pub/linux/kde/
-    https://mirrors.ocf.berkeley.edu/kde/
-    http://mirrors.mit.edu/kde/
-    https://mirrors.ustc.edu.cn/kde/
-    http://ftp.funet.fi/pub/mirrors/ftp.kde.org/pub/kde/
-    ftp://ftp.kde.org/pub/kde/
+    "https://ftp.gwdg.de/pub/linux/kde/"
+    "https://mirrors.ocf.berkeley.edu/kde/"
+    "http://mirrors.mit.edu/kde/"
+    "https://mirrors.ustc.edu.cn/kde/"
+    "http://ftp.funet.fi/pub/mirrors/ftp.kde.org/pub/kde/"
+    "ftp://ftp.kde.org/pub/kde/"
   ];
 
   # Gentoo files.
   gentoo = [
-    http://ftp.snt.utwente.nl/pub/os/linux/gentoo/
-    http://distfiles.gentoo.org/
-    ftp://mirrors.kernel.org/gentoo/
+    "http://ftp.snt.utwente.nl/pub/os/linux/gentoo/"
+    "http://distfiles.gentoo.org/"
+    "ftp://mirrors.kernel.org/gentoo/"
   ];
 
   savannah = [
     # Mirrors from https://download-mirror.savannah.gnu.org/releases/00_MIRRORS.html
-    http://mirror.easyname.at/nongnu/
-    http://mirror2.klaus-uwe.me/nongnu/
-    http://savannah.c3sl.ufpr.br/
-    http://mirror.csclub.uwaterloo.ca/nongnu/
-    http://mirror.cedia.org.ec/nongnu/
-    http://ftp.igh.cnrs.fr/pub/nongnu/
-    http://mirror6.layerjet.com/nongnu
-    http://mirror.netcologne.de/savannah/
-    http://ftp.cc.uoc.gr/mirrors/nongnu.org/
-    http://nongnu.uib.no/
-    http://mirrors.fe.up.pt/pub/nongnu/
-    http://mirror.lihnidos.org/GNU/savannah/
-    http://savannah.mirror.si/
-    http://ftp.acc.umu.se/mirror/gnu.org/savannah/
-    http://ftp.twaren.net/Unix/NonGNU/
-    http://ftp.yzu.edu.tw/pub/nongnu/
-    http://mirror.rackdc.com/savannah/
-    http://savannah-nongnu-org.ip-connect.vn.ua/
-    http://www.mirrorservice.org/sites/download.savannah.gnu.org/releases/
-    http://savannah.spinellicreations.com/
-    http://gnu.mirrors.pair.com/savannah/savannah/
-    ftp://mirror.easyname.at/nongnu/
-    ftp://mirror2.klaus-uwe.me/nongnu/
-    ftp://savannah.c3sl.ufpr.br/savannah-nongnu/
-    ftp://mirror.csclub.uwaterloo.ca/nongnu/
-    ftp://mirror.cedia.org.ec/nongnu
-    ftp://ftp.igh.cnrs.fr/pub/nongnu/
-    ftp://mirror6.layerjet.com/nongnu/
-    ftp://mirror.netcologne.de/savannah/
-    ftp://nongnu.uib.no/pub/nongnu/
-    ftp://mirrors.fe.up.pt/pub/nongnu/
-    ftp://savannah.mirror.si/savannah/
-    ftp://ftp.twaren.net/Unix/NonGNU/
-    ftp://ftp.yzu.edu.tw/pub/nongnu/
-    ftp://savannah-nongnu-org.ip-connect.vn.ua/mirror/savannah.nongnu.org/
-    ftp://ftp.mirrorservice.org/sites/download.savannah.gnu.org/releases/
-    ftp://spinellicreations.com/gnu_dot_org_savannah_mirror/
+    "http://mirror.easyname.at/nongnu/"
+    "http://mirror2.klaus-uwe.me/nongnu/"
+    "http://savannah.c3sl.ufpr.br/"
+    "http://mirror.csclub.uwaterloo.ca/nongnu/"
+    "http://mirror.cedia.org.ec/nongnu/"
+    "http://ftp.igh.cnrs.fr/pub/nongnu/"
+    "http://mirror6.layerjet.com/nongnu"
+    "http://mirror.netcologne.de/savannah/"
+    "http://ftp.cc.uoc.gr/mirrors/nongnu.org/"
+    "http://nongnu.uib.no/"
+    "http://mirrors.fe.up.pt/pub/nongnu/"
+    "http://mirror.lihnidos.org/GNU/savannah/"
+    "http://savannah.mirror.si/"
+    "http://ftp.acc.umu.se/mirror/gnu.org/savannah/"
+    "http://ftp.twaren.net/Unix/NonGNU/"
+    "http://ftp.yzu.edu.tw/pub/nongnu/"
+    "http://mirror.rackdc.com/savannah/"
+    "http://savannah-nongnu-org.ip-connect.vn.ua/"
+    "http://www.mirrorservice.org/sites/download.savannah.gnu.org/releases/"
+    "http://savannah.spinellicreations.com/"
+    "http://gnu.mirrors.pair.com/savannah/savannah/"
+    "ftp://mirror.easyname.at/nongnu/"
+    "ftp://mirror2.klaus-uwe.me/nongnu/"
+    "ftp://savannah.c3sl.ufpr.br/savannah-nongnu/"
+    "ftp://mirror.csclub.uwaterloo.ca/nongnu/"
+    "ftp://mirror.cedia.org.ec/nongnu"
+    "ftp://ftp.igh.cnrs.fr/pub/nongnu/"
+    "ftp://mirror6.layerjet.com/nongnu/"
+    "ftp://mirror.netcologne.de/savannah/"
+    "ftp://nongnu.uib.no/pub/nongnu/"
+    "ftp://mirrors.fe.up.pt/pub/nongnu/"
+    "ftp://savannah.mirror.si/savannah/"
+    "ftp://ftp.twaren.net/Unix/NonGNU/"
+    "ftp://ftp.yzu.edu.tw/pub/nongnu/"
+    "ftp://savannah-nongnu-org.ip-connect.vn.ua/mirror/savannah.nongnu.org/"
+    "ftp://ftp.mirrorservice.org/sites/download.savannah.gnu.org/releases/"
+    "ftp://spinellicreations.com/gnu_dot_org_savannah_mirror/"
   ];
 
   samba = [
-    https://www.samba.org/ftp/
-    http://www.samba.org/ftp/
+    "https://www.samba.org/ftp/"
+    "http://www.samba.org/ftp/"
   ];
 
   # BitlBee mirrors, see https://www.bitlbee.org/main.php/mirrors.html .
   bitlbee = [
-    http://get.bitlbee.org/
-    http://get.bitlbee.be/
-    http://get.us.bitlbee.org/
-    http://ftp.snt.utwente.nl/pub/software/bitlbee/
-    http://bitlbee.intergenia.de/
+    "http://get.bitlbee.org/"
+    "http://get.bitlbee.be/"
+    "http://get.us.bitlbee.org/"
+    "http://ftp.snt.utwente.nl/pub/software/bitlbee/"
+    "http://bitlbee.intergenia.de/"
   ];
 
   # ImageMagick mirrors, see https://www.imagemagick.org/script/mirror.php
   imagemagick = [
-    https://www.imagemagick.org/download/
-    https://mirror.checkdomain.de/imagemagick/
-    https://ftp.nluug.nl/ImageMagick/
-    ftp://ftp.sunet.se/pub/multimedia/graphics/ImageMagick/ # also contains older versions removed from most mirrors
-    http://ftp.sunet.se/pub/multimedia/graphics/ImageMagick/
-    ftp://ftp.imagemagick.org/pub/ImageMagick/
-    http://ftp.fifi.org/ImageMagick/
-    ftp://ftp.fifi.org/ImageMagick/
-    http://imagemagick.mirrorcatalogs.com/
-    ftp://imagemagick.mirrorcatalogs.com/imagemagick
+    "https://www.imagemagick.org/download/"
+    "https://mirror.checkdomain.de/imagemagick/"
+    "https://ftp.nluug.nl/ImageMagick/"
+    "ftp://ftp.sunet.se/pub/multimedia/graphics/ImageMagick/" # also contains older versions removed from most mirrors
+    "http://ftp.sunet.se/pub/multimedia/graphics/ImageMagick/"
+    "ftp://ftp.imagemagick.org/pub/ImageMagick/"
+    "http://ftp.fifi.org/ImageMagick/"
+    "ftp://ftp.fifi.org/ImageMagick/"
+    "http://imagemagick.mirrorcatalogs.com/"
+    "ftp://imagemagick.mirrorcatalogs.com/imagemagick"
   ];
 
   # CPAN mirrors.
   cpan = [
-    https://cpan.metacpan.org/
-    https://cpan.perl.org/
-    http://backpan.perl.org/  # for old releases
+    "https://cpan.metacpan.org/"
+    "https://cpan.perl.org/"
+    "http://backpan.perl.org/"  # for old releases
   ];
 
   # CentOS.
   centos = [
-    http://mirror.centos.org/centos/
+    "http://mirror.centos.org/centos/"
     # For old releases
-    http://vault.centos.org/
-    https://archive.kernel.org/centos-vault/
-    http://ftp.jaist.ac.jp/pub/Linux/CentOS-vault/
-    http://mirrors.aliyun.com/centos-vault/
-    https://mirror.chpc.utah.edu/pub/vault.centos.org/
-    https://mirror.its.sfu.ca/mirror/CentOS-vault/
-    https://mirror.math.princeton.edu/pub/centos-vault/
-    https://mirrors.tripadvisor.com/centos-vault/
+    "http://vault.centos.org/"
+    "https://archive.kernel.org/centos-vault/"
+    "http://ftp.jaist.ac.jp/pub/Linux/CentOS-vault/"
+    "http://mirrors.aliyun.com/centos-vault/"
+    "https://mirror.chpc.utah.edu/pub/vault.centos.org/"
+    "https://mirror.its.sfu.ca/mirror/CentOS-vault/"
+    "https://mirror.math.princeton.edu/pub/centos-vault/"
+    "https://mirrors.tripadvisor.com/centos-vault/"
   ];
 
   # Debian.
   debian = [
-    http://httpredir.debian.org/debian/
-    ftp://ftp.au.debian.org/debian/
-    ftp://ftp.de.debian.org/debian/
-    ftp://ftp.es.debian.org/debian/
-    ftp://ftp.fr.debian.org/debian/
-    ftp://ftp.it.debian.org/debian/
-    ftp://ftp.nl.debian.org/debian/
-    ftp://ftp.ru.debian.org/debian/
-    ftp://ftp.debian.org/debian/
-    http://ftp.debian.org/debian/
-    http://archive.debian.org/debian-archive/debian/
-    ftp://ftp.funet.fi/pub/mirrors/ftp.debian.org/debian/
+    "http://httpredir.debian.org/debian/"
+    "ftp://ftp.au.debian.org/debian/"
+    "ftp://ftp.de.debian.org/debian/"
+    "ftp://ftp.es.debian.org/debian/"
+    "ftp://ftp.fr.debian.org/debian/"
+    "ftp://ftp.it.debian.org/debian/"
+    "ftp://ftp.nl.debian.org/debian/"
+    "ftp://ftp.ru.debian.org/debian/"
+    "ftp://ftp.debian.org/debian/"
+    "http://ftp.debian.org/debian/"
+    "http://archive.debian.org/debian-archive/debian/"
+    "ftp://ftp.funet.fi/pub/mirrors/ftp.debian.org/debian/"
   ];
 
   # Ubuntu.
   ubuntu = [
-    http://nl.archive.ubuntu.com/ubuntu/
-    http://de.archive.ubuntu.com/ubuntu/
-    http://archive.ubuntu.com/ubuntu/
-    http://old-releases.ubuntu.com/ubuntu/
+    "http://nl.archive.ubuntu.com/ubuntu/"
+    "http://de.archive.ubuntu.com/ubuntu/"
+    "http://archive.ubuntu.com/ubuntu/"
+    "http://old-releases.ubuntu.com/ubuntu/"
   ];
 
   # Fedora (please only add full mirrors that carry old Fedora distributions as well).
   # See: https://mirrors.fedoraproject.org/publiclist (but not all carry old content).
   fedora = [
-    http://archives.fedoraproject.org/pub/fedora/
-    http://fedora.osuosl.org/
-    http://ftp.nluug.nl/pub/os/Linux/distr/fedora/
-    http://ftp.funet.fi/pub/mirrors/ftp.redhat.com/pub/fedora/
-    http://fedora.bhs.mirrors.ovh.net/
-    http://mirror.csclub.uwaterloo.ca/fedora/
-    http://ftp.linux.cz/pub/linux/fedora/
-    http://ftp.heanet.ie/pub/fedora/
-    http://mirror.1000mbps.com/fedora/
-    http://archives.fedoraproject.org/pub/archive/fedora/
+    "http://archives.fedoraproject.org/pub/fedora/"
+    "http://fedora.osuosl.org/"
+    "http://ftp.nluug.nl/pub/os/Linux/distr/fedora/"
+    "http://ftp.funet.fi/pub/mirrors/ftp.redhat.com/pub/fedora/"
+    "http://fedora.bhs.mirrors.ovh.net/"
+    "http://mirror.csclub.uwaterloo.ca/fedora/"
+    "http://ftp.linux.cz/pub/linux/fedora/"
+    "http://ftp.heanet.ie/pub/fedora/"
+    "http://mirror.1000mbps.com/fedora/"
+    "http://archives.fedoraproject.org/pub/archive/fedora/"
   ];
 
   # Old SUSE distributions.  Unfortunately there is no master site,
   # since SUSE actually delete their old distributions (see
   # ftp://ftp.suse.com/pub/suse/discontinued/deleted-20070817/README.txt).
   oldsuse = [
-    ftp://ftp.gmd.de/ftp.suse.com-discontinued/
+    "ftp://ftp.gmd.de/ftp.suse.com-discontinued/"
   ];
 
   # openSUSE.
   opensuse = [
-    http://opensuse.hro.nl/opensuse/distribution/
-    http://ftp.funet.fi/pub/linux/mirrors/opensuse/distribution/
-    http://ftp.belnet.be/mirror/ftp.opensuse.org/distribution/
-    http://ftp.uni-kassel.de/opensuse/distribution/
-    http://ftp.opensuse.org/pub/opensuse/distribution/
-    http://ftp5.gwdg.de/pub/opensuse/discontinued/distribution/
-    http://ftp.hosteurope.de/mirror/ftp.opensuse.org/discontinued/
-    http://opensuse.mirror.server4you.net/distribution/
-    http://ftp.nsysu.edu.tw/Linux/OpenSuSE/distribution/
+    "http://opensuse.hro.nl/opensuse/distribution/"
+    "http://ftp.funet.fi/pub/linux/mirrors/opensuse/distribution/"
+    "http://ftp.belnet.be/mirror/ftp.opensuse.org/distribution/"
+    "http://ftp.uni-kassel.de/opensuse/distribution/"
+    "http://ftp.opensuse.org/pub/opensuse/distribution/"
+    "http://ftp5.gwdg.de/pub/opensuse/discontinued/distribution/"
+    "http://ftp.hosteurope.de/mirror/ftp.opensuse.org/discontinued/"
+    "http://opensuse.mirror.server4you.net/distribution/"
+    "http://ftp.nsysu.edu.tw/Linux/OpenSuSE/distribution/"
   ];
 
   # Gnome (see http://ftp.gnome.org/pub/GNOME/MIRRORS).
   gnome = [
     # This one redirects to some mirror closeby, so it should be all you need.
-    http://download.gnome.org/
+    "http://download.gnome.org/"
 
-    http://ftp.unina.it/pub/linux/GNOME/
-    http://fr2.rpmfind.net/linux/gnome.org/
-    ftp://ftp.dit.upm.es/pub/GNOME/
-    ftp://ftp.no.gnome.org/pub/GNOME/
-    http://ftp.acc.umu.se/pub/GNOME/
-    http://ftp.belnet.be/mirror/ftp.gnome.org/
-    http://ftp.df.lth.se/pub/gnome/
-    http://linorg.usp.br/gnome/
-    http://mirror.aarnet.edu.au/pub/GNOME/
-    ftp://ftp.cse.buffalo.edu/pub/Gnome/
-    ftp://ftp.nara.wide.ad.jp/pub/X11/GNOME/
+    "http://ftp.unina.it/pub/linux/GNOME/"
+    "http://fr2.rpmfind.net/linux/gnome.org/"
+    "ftp://ftp.dit.upm.es/pub/GNOME/"
+    "ftp://ftp.no.gnome.org/pub/GNOME/"
+    "http://ftp.acc.umu.se/pub/GNOME/"
+    "http://ftp.belnet.be/mirror/ftp.gnome.org/"
+    "http://ftp.df.lth.se/pub/gnome/"
+    "http://linorg.usp.br/gnome/"
+    "http://mirror.aarnet.edu.au/pub/GNOME/"
+    "ftp://ftp.cse.buffalo.edu/pub/Gnome/"
+    "ftp://ftp.nara.wide.ad.jp/pub/X11/GNOME/"
   ];
 
   xfce = [
-    http://archive.xfce.org/
-    http://mirror.netcologne.de/xfce/
-    http://archive.se.xfce.org/xfce/
-    http://archive.be.xfce.org/xfce/
-    http://mirror.perldude.de/archive.xfce.org/
-    http://archive.be2.xfce.org/
-    http://ftp.udc.es/xfce/
-    http://archive.al-us.xfce.org/
-    http://mirror.yongbok.net/X11/xfce-mirror/
-    http://mirrors.tummy.com/pub/archive.xfce.org/
-    http://xfce.mirror.uber.com.au/
+    "http://archive.xfce.org/"
+    "http://mirror.netcologne.de/xfce/"
+    "http://archive.se.xfce.org/xfce/"
+    "http://archive.be.xfce.org/xfce/"
+    "http://mirror.perldude.de/archive.xfce.org/"
+    "http://archive.be2.xfce.org/"
+    "http://ftp.udc.es/xfce/"
+    "http://archive.al-us.xfce.org/"
+    "http://mirror.yongbok.net/X11/xfce-mirror/"
+    "http://mirrors.tummy.com/pub/archive.xfce.org/"
+    "http://xfce.mirror.uber.com.au/"
   ];
 
   # X.org.
   xorg = [
-    https://xorg.freedesktop.org/releases/
-    https://ftp.x.org/archive/
+    "https://xorg.freedesktop.org/releases/"
+    "https://ftp.x.org/archive/"
   ];
 
   # Apache mirrors (see http://www.apache.org/mirrors/).
   apache = [
-    https://www-eu.apache.org/dist/
-    https://www-us.apache.org/dist/
-    http://www.eu.apache.org/dist/
-    ftp://ftp.fu-berlin.de/unix/www/apache/
-    http://ftp.tudelft.nl/apache/
-    http://mirror.cc.columbia.edu/pub/software/apache/
-    https://www.apache.org/dist/
-    https://archive.apache.org/dist/ # fallback for old releases
-    ftp://ftp.funet.fi/pub/mirrors/apache.org/
-    http://apache.cs.uu.nl/
-    http://apache.cs.utah.edu/
+    "https://www-eu.apache.org/dist/"
+    "https://www-us.apache.org/dist/"
+    "http://www.eu.apache.org/dist/"
+    "ftp://ftp.fu-berlin.de/unix/www/apache/"
+    "http://ftp.tudelft.nl/apache/"
+    "http://mirror.cc.columbia.edu/pub/software/apache/"
+    "https://www.apache.org/dist/"
+    "https://archive.apache.org/dist/" # fallback for old releases
+    "ftp://ftp.funet.fi/pub/mirrors/apache.org/"
+    "http://apache.cs.uu.nl/"
+    "http://apache.cs.utah.edu/"
   ];
 
   postgresql = [
-    http://ftp.postgresql.org/pub/
-    ftp://ftp.postgresql.org/pub/
-    ftp://ftp-archives.postgresql.org/pub/
+    "http://ftp.postgresql.org/pub/"
+    "ftp://ftp.postgresql.org/pub/"
+    "ftp://ftp-archives.postgresql.org/pub/"
   ];
 
   metalab = [
-    ftp://mirrors.kernel.org/metalab/
-    ftp://ftp.gwdg.de/pub/linux/metalab/
-    ftp://ftp.xemacs.org/sites/metalab.unc.edu/
+    "ftp://mirrors.kernel.org/metalab/"
+    "ftp://ftp.gwdg.de/pub/linux/metalab/"
+    "ftp://ftp.xemacs.org/sites/metalab.unc.edu/"
   ];
 
   # Bioconductor mirrors (from http://bioconductor.org/about/mirrors)
@@ -323,118 +323,118 @@
     # http://bioconductor.fmrp.usp.br/
     # http://mirror.aarnet.edu.au/pub/bioconductor/
     # http://watson.nci.nih.gov/bioc_mirror/
-    http://bioconductor.jp/packages/
-    http://bioconductor.statistik.tu-dortmund.de/packages/
-    http://mirrors.ebi.ac.uk/bioconductor/packages/
-    http://mirrors.ustc.edu.cn/bioc/
+    "http://bioconductor.jp/packages/"
+    "http://bioconductor.statistik.tu-dortmund.de/packages/"
+    "http://mirrors.ebi.ac.uk/bioconductor/packages/"
+    "http://mirrors.ustc.edu.cn/bioc/"
   ];
 
   # Hackage mirrors
   hackage = [
-    http://hackage.haskell.org/package/
-    http://hdiff.luite.com/packages/archive/package/
-    http://hackage.fpcomplete.com/package/
-    http://objects-us-east-1.dream.io/hackage-mirror/package/
+    "http://hackage.haskell.org/package/"
+    "http://hdiff.luite.com/packages/archive/package/"
+    "http://hackage.fpcomplete.com/package/"
+    "http://objects-us-east-1.dream.io/hackage-mirror/package/"
   ];
 
   # Roy marples mirrors
   roy = [
-    http://roy.marples.name/downloads/
-    http://roy.aydogan.net/
-    http://cflags.cc/roy/
+    "http://roy.marples.name/downloads/"
+    "http://roy.aydogan.net/"
+    "http://cflags.cc/roy/"
   ];
 
   # Sage mirrors (http://www.sagemath.org/mirrors.html)
   sageupstream = [
     # Africa
-    http://sagemath.polytechnic.edu.na/spkg/upstream/
-    ftp://ftp.sun.ac.za/pub/mirrors/www.sagemath.org/spkg/upstream/
-    http://sagemath.mirror.ac.za/spkg/upstream/
-    https://ftp.leg.uct.ac.za/pub/packages/sage/spkg/upstream/
-    http://mirror.ufs.ac.za/sagemath/spkg/upstream/
+    "http://sagemath.polytechnic.edu.na/spkg/upstream/"
+    "ftp://ftp.sun.ac.za/pub/mirrors/www.sagemath.org/spkg/upstream/"
+    "http://sagemath.mirror.ac.za/spkg/upstream/"
+    "https://ftp.leg.uct.ac.za/pub/packages/sage/spkg/upstream/"
+    "http://mirror.ufs.ac.za/sagemath/spkg/upstream/"
 
     # America, North
-    http://mirrors-usa.go-parts.com/sage/sagemath/spkg/upstream/
-    http://mirrors.mit.edu/sage/spkg/upstream/
-    http://www.cecm.sfu.ca/sage/spkg/upstream/
-    http://files.sagemath.org/spkg/upstream/
-    http://mirror.clibre.uqam.ca/sage/spkg/upstream/
-    https://mirrors.xmission.com/sage/spkg/upstream/
+    "http://mirrors-usa.go-parts.com/sage/sagemath/spkg/upstream/"
+    "http://mirrors.mit.edu/sage/spkg/upstream/"
+    "http://www.cecm.sfu.ca/sage/spkg/upstream/"
+    "http://files.sagemath.org/spkg/upstream/"
+    "http://mirror.clibre.uqam.ca/sage/spkg/upstream/"
+    "https://mirrors.xmission.com/sage/spkg/upstream/"
 
     # America, South
-    http://sagemath.c3sl.ufpr.br/spkg/upstream/
-    http://linorg.usp.br/sage/spkg/upstream
+    "http://sagemath.c3sl.ufpr.br/spkg/upstream/"
+    "http://linorg.usp.br/sage/spkg/upstream"
 
     # Asia
-    http://sage.asis.io/spkg/upstream/
-    http://mirror.hust.edu.cn/sagemath/spkg/upstream/
-    https://ftp.iitm.ac.in/sage/spkg/upstream/
-    http://ftp.kaist.ac.kr/sage/spkg/upstream/
-    http://ftp.riken.jp/sagemath/spkg/upstream/
-    https://mirrors.tuna.tsinghua.edu.cn/sagemath/spkg/upstream/
-    https://mirrors.ustc.edu.cn/sagemath/spkg/upstream/
-    http://ftp.tsukuba.wide.ad.jp/software/sage/spkg/upstream/
-    http://ftp.yz.yamagata-u.ac.jp/pub/math/sage/spkg/upstream/
-    https://mirror.yandex.ru/mirrors/sage.math.washington.edu/spkg/upstream/
+    "http://sage.asis.io/spkg/upstream/"
+    "http://mirror.hust.edu.cn/sagemath/spkg/upstream/"
+    "https://ftp.iitm.ac.in/sage/spkg/upstream/"
+    "http://ftp.kaist.ac.kr/sage/spkg/upstream/"
+    "http://ftp.riken.jp/sagemath/spkg/upstream/"
+    "https://mirrors.tuna.tsinghua.edu.cn/sagemath/spkg/upstream/"
+    "https://mirrors.ustc.edu.cn/sagemath/spkg/upstream/"
+    "http://ftp.tsukuba.wide.ad.jp/software/sage/spkg/upstream/"
+    "http://ftp.yz.yamagata-u.ac.jp/pub/math/sage/spkg/upstream/"
+    "https://mirror.yandex.ru/mirrors/sage.math.washington.edu/spkg/upstream/"
 
     # Australia
-    http://echidna.maths.usyd.edu.au/sage/spkg/upstream/
+    "http://echidna.maths.usyd.edu.au/sage/spkg/upstream/"
 
     # Europe
-    http://sage.mirror.garr.it/mirrors/sage/spkg/upstream/
-    http://sunsite.rediris.es/mirror/sagemath/spkg/upstream/
-    http://mirror.switch.ch/mirror/sagemath/spkg/upstream/
-    http://mirrors.fe.up.pt/pub/sage/spkg/upstream/
-    http://www-ftp.lip6.fr/pub/math/sagemath/spkg/upstream/
-    http://ftp.ntua.gr/pub/sagemath/spkg/upstream/
+    "http://sage.mirror.garr.it/mirrors/sage/spkg/upstream/"
+    "http://sunsite.rediris.es/mirror/sagemath/spkg/upstream/"
+    "http://mirror.switch.ch/mirror/sagemath/spkg/upstream/"
+    "http://mirrors.fe.up.pt/pub/sage/spkg/upstream/"
+    "http://www-ftp.lip6.fr/pub/math/sagemath/spkg/upstream/"
+    "http://ftp.ntua.gr/pub/sagemath/spkg/upstream/"
   ];
 
   # MySQL mirrors
   mysql = [
-    http://cdn.mysql.com/Downloads/
+    "http://cdn.mysql.com/Downloads/"
   ];
 
   # OpenBSD mirrors
   openbsd = [
-    http://ftp.openbsd.org/pub/OpenBSD/
-    ftp://ftp.nluug.nl/pub/OpenBSD/
-    ftp://ftp-stud.fht-esslingen.de/pub/OpenBSD/
-    ftp://ftp.halifax.rwth-aachen.de/pub/OpenBSD/
-    ftp://mirror.switch.ch/pub/OpenBSD/
+    "http://ftp.openbsd.org/pub/OpenBSD/"
+    "ftp://ftp.nluug.nl/pub/OpenBSD/"
+    "ftp://ftp-stud.fht-esslingen.de/pub/OpenBSD/"
+    "ftp://ftp.halifax.rwth-aachen.de/pub/OpenBSD/"
+    "ftp://mirror.switch.ch/pub/OpenBSD/"
   ];
 
   # Steam Runtime mirrors
   steamrt = [
-    http://repo.steampowered.com/steamrt/
-    https://public.abbradar.moe/steamrt/
+    "http://repo.steampowered.com/steamrt/"
+    "https://public.abbradar.moe/steamrt/"
   ];
 
   # Python PyPI mirrors
   pypi = [
-    https://files.pythonhosted.org/packages/source/
+    "https://files.pythonhosted.org/packages/source/"
     # pypi.io is a more semantic link, but atm it’s referencing
     # files.pythonhosted.org over two redirects
-    https://pypi.io/packages/source/
+    "https://pypi.io/packages/source/"
   ];
 
   # Mozilla projects.
   mozilla = [
-    http://download.cdn.mozilla.net/pub/mozilla.org/
-    https://archive.mozilla.org/pub/
+    "http://download.cdn.mozilla.net/pub/mozilla.org/"
+    "https://archive.mozilla.org/pub/"
   ];
 
   # Maven Central
   maven = [
-    https://repo1.maven.org/maven2/
-    https://central.maven.org/maven2/
+    "https://repo1.maven.org/maven2/"
+    "https://central.maven.org/maven2/"
   ];
 
   # Alsa Project
   alsa = [
-    https://www.alsa-project.org/files/pub/
-    ftp://ftp.alsa-project.org/pub/
-    http://alsa.cybermirror.org/
-    http://www.mirrorservice.org/sites/ftp.alsa-project.org/pub/
-    http://alsa.mirror.fr/
+    "https://www.alsa-project.org/files/pub/"
+    "ftp://ftp.alsa-project.org/pub/"
+    "http://alsa.cybermirror.org/"
+    "http://www.mirrorservice.org/sites/ftp.alsa-project.org/pub/"
+    "http://alsa.mirror.fr/"
   ];
 }
diff --git a/pkgs/build-support/vm/default.nix b/pkgs/build-support/vm/default.nix
index 487a91145c5..f86e3371384 100644
--- a/pkgs/build-support/vm/default.nix
+++ b/pkgs/build-support/vm/default.nix
@@ -831,15 +831,15 @@ rec {
       fullName = "Ubuntu 12.04 Precise (i386)";
       packagesLists =
         [ (fetchurl {
-            url = mirror://ubuntu/dists/precise/main/binary-i386/Packages.bz2;
+            url = "mirror://ubuntu/dists/precise/main/binary-i386/Packages.bz2";
             sha256 = "18ns9h4qhvjfcip9z55grzi371racxavgqkp6b5kfkdq2wwwax2d";
           })
           (fetchurl {
-            url = mirror://ubuntu/dists/precise/universe/binary-i386/Packages.bz2;
+            url = "mirror://ubuntu/dists/precise/universe/binary-i386/Packages.bz2";
             sha256 = "085lkzbnzkc74kfdmwdc32sfqyfz8dr0rbiifk8kx9jih3xjw2jk";
           })
         ];
-      urlPrefix = mirror://ubuntu;
+      urlPrefix = "mirror://ubuntu";
       packages = commonDebPackages ++ [ "diffutils" ];
     };
 
@@ -848,15 +848,15 @@ rec {
       fullName = "Ubuntu 12.04 Precise (amd64)";
       packagesLists =
         [ (fetchurl {
-            url = mirror://ubuntu/dists/precise/main/binary-amd64/Packages.bz2;
+            url = "mirror://ubuntu/dists/precise/main/binary-amd64/Packages.bz2";
             sha256 = "1aabpn0hdih6cbabyn87yvhccqj44q9k03mqmjsb920iqlckl3fc";
           })
           (fetchurl {
-            url = mirror://ubuntu/dists/precise/universe/binary-amd64/Packages.bz2;
+            url = "mirror://ubuntu/dists/precise/universe/binary-amd64/Packages.bz2";
             sha256 = "0x4hz5aplximgb7gnpvrhkw8m7a40s80rkm5b8hil0afblwlg4vr";
           })
         ];
-      urlPrefix = mirror://ubuntu;
+      urlPrefix = "mirror://ubuntu";
       packages = commonDebPackages ++ [ "diffutils" ];
     };
 
@@ -865,15 +865,15 @@ rec {
       fullName = "Ubuntu 14.04 Trusty (i386)";
       packagesLists =
         [ (fetchurl {
-            url = mirror://ubuntu/dists/trusty/main/binary-i386/Packages.bz2;
+            url = "mirror://ubuntu/dists/trusty/main/binary-i386/Packages.bz2";
             sha256 = "1d5y3v3v079gdq45hc07ja0bjlmzqfwdwwlq0brwxi8m75k3iz7x";
           })
           (fetchurl {
-            url = mirror://ubuntu/dists/trusty/universe/binary-i386/Packages.bz2;
+            url = "mirror://ubuntu/dists/trusty/universe/binary-i386/Packages.bz2";
             sha256 = "03x9w92by320rfklrqhcl3qpwmnxds9c8ijl5zhcb21d6dcz5z1a";
           })
         ];
-      urlPrefix = mirror://ubuntu;
+      urlPrefix = "mirror://ubuntu";
       packages = commonDebPackages ++ [ "diffutils" "libc-bin" ];
     };
 
@@ -882,15 +882,15 @@ rec {
       fullName = "Ubuntu 14.04 Trusty (amd64)";
       packagesLists =
         [ (fetchurl {
-            url = mirror://ubuntu/dists/trusty/main/binary-amd64/Packages.bz2;
+            url = "mirror://ubuntu/dists/trusty/main/binary-amd64/Packages.bz2";
             sha256 = "1hhzbyqfr5i0swahwnl5gfp5l9p9hspywb1vpihr3b74p1z935bh";
           })
           (fetchurl {
-            url = mirror://ubuntu/dists/trusty/universe/binary-amd64/Packages.bz2;
+            url = "mirror://ubuntu/dists/trusty/universe/binary-amd64/Packages.bz2";
             sha256 = "04560ba8s4z4v5iawknagrkn9q1nzvpn081ycmqvhh73p3p3g1jm";
           })
         ];
-      urlPrefix = mirror://ubuntu;
+      urlPrefix = "mirror://ubuntu";
       packages = commonDebPackages ++ [ "diffutils" "libc-bin" ];
     };
 
@@ -899,15 +899,15 @@ rec {
       fullName = "Ubuntu 16.04 Xenial (i386)";
       packagesLists =
         [ (fetchurl {
-            url = mirror://ubuntu/dists/xenial/main/binary-i386/Packages.xz;
+            url = "mirror://ubuntu/dists/xenial/main/binary-i386/Packages.xz";
             sha256 = "13r75sp4slqy8w32y5dnr7pp7p3cfvavyr1g7gwnlkyrq4zx4ahy";
           })
           (fetchurl {
-            url = mirror://ubuntu/dists/xenial/universe/binary-i386/Packages.xz;
+            url = "mirror://ubuntu/dists/xenial/universe/binary-i386/Packages.xz";
             sha256 = "14fid1rqm3sc0wlygcvn0yx5aljf51c2jpd4x0zxij4019316hsh";
           })
         ];
-      urlPrefix = mirror://ubuntu;
+      urlPrefix = "mirror://ubuntu";
       packages = commonDebPackages ++ [ "diffutils" "libc-bin" ];
     };
 
@@ -916,15 +916,15 @@ rec {
       fullName = "Ubuntu 16.04 Xenial (amd64)";
       packagesLists =
         [ (fetchurl {
-            url = mirror://ubuntu/dists/xenial/main/binary-amd64/Packages.xz;
+            url = "mirror://ubuntu/dists/xenial/main/binary-amd64/Packages.xz";
             sha256 = "110qnkhjkkwm316fbig3aivm2595ydz6zskc4ld5cr8ngcrqm1bn";
           })
           (fetchurl {
-            url = mirror://ubuntu/dists/xenial/universe/binary-amd64/Packages.xz;
+            url = "mirror://ubuntu/dists/xenial/universe/binary-amd64/Packages.xz";
             sha256 = "0mm7gj491yi6q4v0n4qkbsm94s59bvqir6fk60j73w7y4la8rg68";
           })
         ];
-      urlPrefix = mirror://ubuntu;
+      urlPrefix = "mirror://ubuntu";
       packages = commonDebPackages ++ [ "diffutils" "libc-bin" ];
     };
 
@@ -933,15 +933,15 @@ rec {
       fullName = "Ubuntu 17.10 Artful (i386)";
       packagesLists =
         [ (fetchurl {
-            url = mirror://ubuntu/dists/artful/main/binary-i386/Packages.xz;
+            url = "mirror://ubuntu/dists/artful/main/binary-i386/Packages.xz";
             sha256 = "18yrj4kqdzm39q0527m97h5ing58hkm9yq9iyj636zh2rclym3c8";
           })
           (fetchurl {
-            url = mirror://ubuntu/dists/artful/universe/binary-i386/Packages.xz;
+            url = "mirror://ubuntu/dists/artful/universe/binary-i386/Packages.xz";
             sha256 = "1v0njw2w80xfmxi7by76cs8hyxlla5h3gqajlpdw5srjgx2qrm2g";
           })
         ];
-      urlPrefix = mirror://ubuntu;
+      urlPrefix = "mirror://ubuntu";
       packages = commonDebPackages ++ [ "diffutils" "libc-bin" ];
     };
 
@@ -950,15 +950,15 @@ rec {
       fullName = "Ubuntu 17.10 Artful (amd64)";
       packagesLists =
         [ (fetchurl {
-            url = mirror://ubuntu/dists/artful/main/binary-amd64/Packages.xz;
+            url = "mirror://ubuntu/dists/artful/main/binary-amd64/Packages.xz";
             sha256 = "104g57j1l3vi8wb5f7rgjvjhf82ccs0vwhc59jfc4ynd51z7fqjk";
           })
           (fetchurl {
-            url = mirror://ubuntu/dists/artful/universe/binary-amd64/Packages.xz;
+            url = "mirror://ubuntu/dists/artful/universe/binary-amd64/Packages.xz";
             sha256 = "1qzs95wfy9inaskfx9cf1l5yd3aaqwzy72zzi9xyvkxi75k5gcn4";
           })
         ];
-      urlPrefix = mirror://ubuntu;
+      urlPrefix = "mirror://ubuntu";
       packages = commonDebPackages ++ [ "diffutils" "libc-bin" ];
     };
 
@@ -967,15 +967,15 @@ rec {
       fullName = "Ubuntu 18.04 Bionic (i386)";
       packagesLists =
         [ (fetchurl {
-            url = mirror://ubuntu/dists/bionic/main/binary-i386/Packages.xz;
+            url = "mirror://ubuntu/dists/bionic/main/binary-i386/Packages.xz";
             sha256 = "0f0v4131kwf7m7f8j3288rlqdxk1k3vqy74b7fcfd6jz9j8d840i";
           })
           (fetchurl {
-            url = mirror://ubuntu/dists/bionic/universe/binary-i386/Packages.xz;
+            url = "mirror://ubuntu/dists/bionic/universe/binary-i386/Packages.xz";
             sha256 = "1v75c0dqr0wp0dqd4hnci92qqs4hll8frqdbpswadgxm5chn91bw";
           })
         ];
-      urlPrefix = mirror://ubuntu;
+      urlPrefix = "mirror://ubuntu";
       packages = commonDebPackages ++ [ "diffutils" "libc-bin" ];
     };
 
@@ -984,15 +984,15 @@ rec {
       fullName = "Ubuntu 18.04 Bionic (amd64)";
       packagesLists =
         [ (fetchurl {
-            url = mirror://ubuntu/dists/bionic/main/binary-amd64/Packages.xz;
+            url = "mirror://ubuntu/dists/bionic/main/binary-amd64/Packages.xz";
             sha256 = "1ls81bjyvmfz6i919kszl7xks1ibrh1xqhsk6698ackndkm0wp39";
           })
           (fetchurl {
-            url = mirror://ubuntu/dists/bionic/universe/binary-amd64/Packages.xz;
+            url = "mirror://ubuntu/dists/bionic/universe/binary-amd64/Packages.xz";
             sha256 = "1832nqpn4ap95b3sj870xqayrza9in4kih9jkmjax27pq6x15v1r";
           })
         ];
-      urlPrefix = mirror://ubuntu;
+      urlPrefix = "mirror://ubuntu";
       packages = commonDebPackages ++ [ "diffutils" "libc-bin" ];
     };
 
@@ -1000,10 +1000,10 @@ rec {
       name = "debian-8.11-jessie-i386";
       fullName = "Debian 8.11 Jessie (i386)";
       packagesList = fetchurl {
-        url = mirror://debian/dists/jessie/main/binary-i386/Packages.xz;
+        url = "mirror://debian/dists/jessie/main/binary-i386/Packages.xz";
         sha256 = "0adblarhx50yga900il6m25ng0csa81i3wid1dxxmydbdmri7v7d";
       };
-      urlPrefix = mirror://debian;
+      urlPrefix = "mirror://debian";
       packages = commonDebianPackages;
     };
 
@@ -1011,10 +1011,10 @@ rec {
       name = "debian-8.11-jessie-amd64";
       fullName = "Debian 8.11 Jessie (amd64)";
       packagesList = fetchurl {
-        url = mirror://debian/dists/jessie/main/binary-amd64/Packages.xz;
+        url = "mirror://debian/dists/jessie/main/binary-amd64/Packages.xz";
         sha256 = "09y1mv4kqllhxpk1ibjsyl5jig5bp0qxw6pp4sn56rglrpygmn5x";
       };
-      urlPrefix = mirror://debian;
+      urlPrefix = "mirror://debian";
       packages = commonDebianPackages;
     };
 
@@ -1022,10 +1022,10 @@ rec {
       name = "debian-9.8-stretch-i386";
       fullName = "Debian 9.8 Stretch (i386)";
       packagesList = fetchurl {
-        url = http://snapshot.debian.org/archive/debian/20200301T030401Z/dists/stretch/main/binary-i386/Packages.xz;
+        url = "http://snapshot.debian.org/archive/debian/20200301T030401Z/dists/stretch/main/binary-i386/Packages.xz";
         sha256 = "1jglr1d1jys3xddp8f7w9j05db39fah8xy4gfkpqbd1b5d2caslz";
       };
-      urlPrefix = mirror://debian;
+      urlPrefix = "mirror://debian";
       packages = commonDebianPackages;
     };
 
@@ -1033,10 +1033,10 @@ rec {
       name = "debian-9.8-stretch-amd64";
       fullName = "Debian 9.8 Stretch (amd64)";
       packagesList = fetchurl {
-        url = http://snapshot.debian.org/archive/debian/20190503T090946Z/dists/stretch/main/binary-amd64/Packages.xz;
+        url = "http://snapshot.debian.org/archive/debian/20190503T090946Z/dists/stretch/main/binary-amd64/Packages.xz";
         sha256 = "01q00nl47p12n7wx0xclx59wf3zlkzrgj3zxpshyvb91xdnw5sh6";
       };
-      urlPrefix = mirror://debian;
+      urlPrefix = "mirror://debian";
       packages = commonDebianPackages;
     };