Migrate from Travis CI to GitHub Actions

This removes all CI builds from travis-ci, due to their recent changes
in policy and harsh limitations on builds. With build times over 2
hours, it was a significant hindrance to development.

Instead of Travis CI, the CI is now split on Sourcehut and GitHub. Since
Sourcehut only supports Linux/BSD, all builds on those operating systems
are executed there. The GitHub Actions CI is used to build for
Windows/macOS, which are not available on Sourcehut.

Since asset deployment for releases requires builds on all platforms,
this is also done on GitHub actions. Though the new `upload_asset.sh`
script makes sure that migration in the future is fairly simple and we
do not tie ourselves to the overly complicated GitHub Actions ecosystem.

1 files changed, 93 insertions, 0 deletions

diff --git a/.github/workflows/upload_asset.sh b/.github/workflows/upload_asset.sh
new file mode 100755
index 00000000..3005e707
--- /dev/null
+++ b/.github/workflows/upload_asset.sh
@@ -0,0 +1,93 @@
+#!/bin/bash
+
+# Assure parameters are correct.
+if [ $# -lt 2 ]; then
+    echo "Usage: upload_asset.sh <FILE> <TOKEN>"
+    exit 1
+fi
+
+repo="alacritty/alacritty"
+file_path=$1
+bearer=$2
+
+echo "Starting asset upload from $file_path to $repo."
+
+# Get the release for this tag.
+tag="$(git describe --tags --abbrev=0)"
+
+# Make sure the git tag could be determined.
+if [ -z "$tag" ]; then
+    printf "\e[31mError: Unable to find git tag\e[0m\n"
+    exit 1
+fi
+
+echo "Git tag: $tag"
+
+# Get the upload URL for the current tag.
+#
+# Since this might be a draft release, we can't just use the /releases/tags/:tag
+# endpoint which only shows published releases.
+echo "Checking for existing release..."
+upload_url=$(\
+    curl \
+        -H "Authorization: Bearer $bearer" \
+        "https://api.github.com/repos/$repo/releases" \
+        2> /dev/null \
+    | grep -E "(upload_url|tag_name)" \
+    | paste - - \
+    | grep -e "tag_name\": \"$tag" \
+    | head -n 1 \
+    | sed 's/.*\(https.*assets\).*/\1/' \
+)
+
+# Create a new release if we didn't find one for this tag.
+if [ -z "$upload_url" ]; then
+    echo "No release found."
+    echo "Creating new release..."
+
+    # Create new release.
+    response=$(
+        curl -f \
+            -X POST \
+            -H "Authorization: Bearer $bearer" \
+            -d "{\"tag_name\":\"$tag\",\"draft\":true}" \
+            "https://api.github.com/repos/$repo/releases" \
+            2> /dev/null\
+    )
+
+    # Abort if the release could not be created.
+    if [ $? -ne 0 ]; then
+        printf "\e[31mError: Unable to create new release.\e[0m\n"
+        exit 1;
+    fi
+
+    # Extract upload URL from new release.
+    upload_url=$(\
+        echo "$response" \
+        | grep "upload_url" \
+        | sed 's/.*: "\(.*\){.*/\1/' \
+    )
+fi
+
+# Propagate error if no URL for asset upload could be found.
+if [ -z "$upload_url" ]; then
+    printf "\e[31mError: Unable to find release upload url.\e[0m\n"
+    exit 2
+fi
+
+# Upload the file to the tag's release.
+file_name=${file_path##*/}
+echo "Uploading asset $file_name to $upload_url..."
+curl -f \
+    -X POST \
+    -H "Authorization: Bearer $bearer" \
+    -H "Content-Type: application/octet-stream" \
+    --data-binary @"$file_path" \
+    "$upload_url?name=$file_name" \
+    &> /dev/null \
+|| { \
+    printf "\e[31mError: Unable to upload asset.\e[0m\n" \
+    && exit 3; \
+}
+
+printf "\e[32mSuccess\e[0m\n"