Fix snap build

.snapsquid.conf

@@ -1,14 +0,0 @@
-# In 2015, cabal-install had a http bug triggered when proxies didn't keep
-# the connection open. This version made it into Ubuntu Xenial as used by
-# Snapcraft. In June 2018, Snapcraft's proxy started triggering this bug.
-#
-#     https://bugs.launchpad.net/launchpad-buildd/+bug/1797809
-#
-# Workaround: add more proxy
-
-visible_hostname localhost
-http_port 8888
-cache_peer 10.10.10.1 parent 8222 0 no-query default
-cache_peer_domain localhost !.internal
-http_access allow all
-

snap/snapcraft.yaml

@@ -23,7 +23,7 @@ description: |
       # snap connect shellcheck:removable-media
 
 version: git
-base: core18
+base: core20
 grade: stable
 confinement: strict
 
@@ -40,16 +40,16 @@ parts:
     source: .
     build-packages:
       - cabal-install
-      - squid
+    stage-packages:
+      - libatomic1
     override-build: |
-      # See comments in .snapsquid.conf
-      [ "$http_proxy" ] && {
-        squid3 -f .snapsquid.conf
-        export http_proxy="http://localhost:8888"
-        sleep 3
-      }
+      # Give ourselves enough memory to build
+      dd if=/dev/zero of=/tmp/swap bs=1M count=2000
+      mkswap /tmp/swap
+      swapon /tmp/swap
+
       cabal sandbox init
-      cabal update || cat /var/log/squid/*
+      cabal update
       cabal install -j
 
       install -d $SNAPCRAFT_PART_INSTALL/usr/bin