[CI] use install scripts from py-ipfs-http-client (#1068)

* use install scripts from py-ipfs-http-client

* fix typo in docs rule

.travis.yml

@@ -44,9 +44,61 @@ jobs:
     - <<: *test
       name: integration (ipfs/redis)
       before_install:
-        - sudo snap install ipfs
-        - "/snap/bin/ipfs --version"
-        - "/snap/bin/ipfs daemon --init --offline &>/dev/null &"
+         - |-
+            ### Copied from https://github.com/ipfs-shipyard/py-ipfs-http-client/blob/master/.travis.yml
+            ### ==== MODIFY THIS WHEN CHANGING TARGET OR MINIMUM IPFS VERSION ==== ###
+            case "${IPFS_VERSION:-latest}" in
+               latest)  # Currently targeted version
+                  VERSION=0.6.0
+                  SHA512_LINUX=57e4ac078f4605e3e765c6c5a54fe6e7f45268fa7ec06fc54f03e0046643dff65718f6f143a67fe08c458a7c86e30b5a53c400bdb57b6a2122bdc5df1a4b8f33
+                  SHA512_DARWIN=daf6fd4cef6b892ecff432895912c3962c4033d81c275fd8ab7172612f87db0aedfeb0d4c5a408a3f07d6f56399b4d5300d25e81c20d9cc9bed59fef02581360
+                  SHA512_WINDOWS=2fb04eaa90b57fa9239a9e05234f288d017ba6d9001fa5330929faec3d6e0ad8b7d7eab35c3d0ee42fdd52e0d60a9b591dee3e59251b6d0e00c3d1ead15bf12d
+               ;;
+               compat)  # Earliest supported version
+                  VERSION=0.4.22
+                  SHA512_LINUX=49b99fec741d67f7bad8fb6fbbd984967f06dfc3de846d10dca34b166f621a182d12f13cf5ccf4e4f33747b67cede6f4205b4cd9b57ce5244128d1385ec82c85
+               ;;
+            esac
+            ### ------------------------------ END ------------------------------- ###
+
+            set -u
+
+            # Derive usable parameters from the above constants
+            case "${TRAVIS_OS_NAME}" in
+               linux)
+                  export IPFS_DL_PATH="go-ipfs/v${VERSION}/go-ipfs_v${VERSION}_linux-amd64.tar.gz"
+                  export IPFS_DL_SHA512="${SHA512_LINUX}"
+               ;;
+               osx)
+                  export IPFS_DL_PATH="go-ipfs/v${VERSION}/go-ipfs_v${VERSION}_darwin-amd64.tar.gz"
+                  export IPFS_DL_SHA512="${SHA512_DARWIN}"
+                  
+                  # Make the `sha512sum` command available under that name
+                  export PATH="$(echo /usr/local/Cellar/coreutils/*/libexec/gnubin):${PATH}"
+               ;;
+               windows)
+                  export IPFS_DL_PATH="go-ipfs/v${VERSION}/go-ipfs_v${VERSION}_windows-amd64.zip"
+                  export IPFS_DL_SHA512="${SHA512_WINDOWS}"
+               ;;
+            esac
+            export IPFS_DL_BASENAME="${IPFS_DL_PATH##*/}"
+
+            set +u
+         # Download the daemon application
+         - wget "https://dist.ipfs.io/${IPFS_DL_PATH}" 2>&1
+         # Verify its checksum
+         - echo "${IPFS_DL_SHA512}  ${IPFS_DL_BASENAME}" | sha512sum -c
+         # Extract verified archive
+         - |-
+            if [[ "${IPFS_DL_BASENAME}" =~ .*\.zip ]];
+            then
+               unzip "${IPFS_DL_BASENAME}"
+            else
+               tar -xvf "${IPFS_DL_BASENAME}"
+            fi
+         # Add IPFS daemon to search path
+         - export PATH="${PWD}/go-ipfs:${PATH}"
+         - ipfs daemon --init --offline &>/dev/null &
       services:
         - redis
         - docker
@@ -56,7 +108,7 @@ jobs:
       python: 3.5
     - <<: *test
       python: 3.7
-      end:
+      env:
         - TOXENV=docs
     - <<: *test
       python: 2.7