Add auto update using Travis

.travis.yml

@@ -0,0 +1,16 @@
+language: nix
+os: linux
+env:
+  global:
+  - SSH_KEY="/tmp/deploy_rsa"
+  - TARGET_BRANCH="master"
+  - DEPLOY_BRANCH="master"
+  - GIT_NAME="EXWM-Updater"
+  - GIT_EMAIL="exwm-updater@example.org"
+before_install:
+- openssl aes-256-cbc -K $encrypted_88023bb2dbf0_key -iv $encrypted_88023bb2dbf0_iv -in .travis/deploy_rsa.enc -out $SSH_KEY -d
+
+script:
+- "./update"
+after_success:
+- "./.travis/deploy.sh"

.travis/README.org

@@ -0,0 +1,38 @@
+* Set up of ssh key
+#+begin_src sh
+# Generate SSH key
+ssh-keygen -t rsa -b 4096 -C 'build@travis-ci.org' -f ./.travis/deploy_rsa
+
+# Get the travis util
+nix-shell --run fish -p travis
+
+# Generate a github access token to use with travis:
+# https://github.com/settings/tokens
+#
+# I gave it all scopes for user and repo.
+
+# Log in to travis
+travis login --user etu --github-token <your-token-here>
+
+# Encrypt the file using travis
+travis encrypt-file .travis/deploy_rsa --add
+
+# Move the encrypted file to the travis directory
+mv deploy_rsa.enc .travis/
+
+# Add the public key as a deploy key to the repo with write-access:
+# https://github.com/adisbladis/exwm-overlay/settings/keys/new
+cat .travis/deploy_rsa.pub
+
+# Remove secret private and the public key
+rm -rf .travis/deploy_rsa .travis/deploy_rsa.pub
+
+# Then just go ahead and commit .travis/deploy_rsa
+#+end_src
+
+* Set up travis build
+Copy my =.travis.yml= file. Alter the names of the the variables in
+=before_install= based on the names of the names of the variables here:
+https://travis-ci.org/etu/exwm-overlay/settings
+
+You should also make a copy of =.travis/deploy.sh=.

.travis/deploy.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+
+set -e
+
+REPO=$(git config remote.origin.url)
+
+if [ -n "$TRAVIS_BUILD_ID" ]; then
+    # When running on Travis we need to use SSH to deploy to GitHub
+    #
+    # The following converts the repo URL to an SSH location,
+    # decrypts the SSH key and sets up the Git config with
+    # the correct user name and email (globally as this is a
+    # temporary travis environment)
+    #
+    # Set the following environment variables in the travis configuration (.travis.yml)
+    #
+    #   DEPLOY_BRANCH    - The only branch that Travis should deploy from
+    #   GIT_NAME         - The Git user name
+    #   GIT_EMAIL        - The Git user email
+    #
+    echo GIT_NAME: $GIT_NAME
+    echo GIT_EMAIL: $GIT_EMAIL
+
+    if [ "$TRAVIS_BRANCH" != "$DEPLOY_BRANCH" ]; then
+        echo "Travis should only deploy from the DEPLOY_BRANCH ($DEPLOY_BRANCH) branch"
+        exit 0
+    fi
+
+    if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
+        echo "Travis should not deploy from pull requests"
+        exit 0
+    fi
+
+    # Switch both git and https protocols as we don't know which travis
+    # is using today (it changed in the past!)
+    REPO=${REPO/git:\/\/github.com\//git@github.com:}
+    REPO=${REPO/https:\/\/github.com\//git@github.com:}
+
+    # Add SSH key to SSH agent
+    chmod 600 $SSH_KEY
+    eval `ssh-agent -s`
+    ssh-add $SSH_KEY
+
+    git config --global user.name "$GIT_NAME"
+    git config --global user.email "$GIT_EMAIL"
+
+    # Set a rw remote
+    git remote set-url origin $REPO
+
+    # Checkout master
+    git fetch origin
+    git checkout master
+
+    # Add changes
+    git add repos/
+
+    # Commit changes
+    git commit -m "Built from commit $REV"
+
+    # Push changes
+    git push $REPO $TARGET_BRANCH
+fi

update

@@ -1,12 +1,12 @@
 #!/usr/bin/env nix-shell
-#! nix-shell -i bash -p curl jq nix
+#! nix-shell -i bash -p curl xmlstarlet nix coreutils
 set -euxo pipefail
 
 function update_repo() {
     repo=$1
     echo $repo
 
-    commit_sha=$(curl "https://api.github.com/repos/ch11ng/$repo/commits?sha=master" | jq -r 'first.sha')
+    commit_sha=$(curl "https://github.com/ch11ng/$repo/commits/master.atom" | xmlstarlet sel -N atom="http://www.w3.org/2005/Atom" -t -m /atom:feed/atom:entry -v atom:id -n | head -n 1 | cut -d '/' -f 2)
     digest=$(nix-prefetch-url --unpack "https://github.com/ch11ng/$repo/archive/${commit_sha}.tar.gz")
     echo "{\"rev\": \"${commit_sha}\", \"sha256\": \"${digest}\"}" > repos/$repo.json
 }