+shub

.github/workflows/ci.yml

@@ -0,0 +1,12 @@
+on:
+  pull_request:
+    paths: shub.sh
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pkgxdev/setup@v2
+      - run: ./shub.sh pkgxdev/demo
+      - run: ./shub.sh pkgxdev/demo   # check cache route works too

shub.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+
+set -eo pipefail
+
+if test -n "$RUNNER_DEBUG" -a -n "$GITHUB_ACTIONS" -o -n "$VERBOSE"; then
+  set -x
+fi
+
+SCRIPTNAME=$1
+shift
+
+if [ -z "$SCRIPTNAME" ]; then
+  echo "usage: shub <scriptname> [args…]" 1>&2
+  exit 64
+fi
+
+if [ "$(uname)" = Darwin ]; then
+  CACHE="${XDG_CACHE_HOME:-$HOME/Library/Caches}/scripthub/$SCRIPTNAME"
+else
+  CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/scripthub/$SCRIPTNAME"
+fi
+
+get_etag() {
+  grep -i ETag "$CACHE/headers.txt" | sed -e 's/ETag: "\(.*\)"/\1/' | tr -d '\r'
+}
+
+if [ -f "$CACHE/headers.txt" ] && ETAG=$(get_etag); then
+  ETAG=(--header If-None-Match:\ $ETAG)
+else
+  mkdir -p "$CACHE"
+fi
+
+URL="https://pkgxdev.github.io/scripthub/$SCRIPTNAME"
+
+if curl \
+    $ETAG \
+    --silent \
+    --fail \
+    --show-error \
+    --dump-header "$CACHE/headers.txt" \
+    --output "$CACHE/script" \
+    "$URL"
+then
+  chmod +x "$CACHE/script"
+  exec "$CACHE/script" "$@"
+elif [ -f "$CACHE/$SCRIPTNAME" ]; then
+  echo "warn: couldn’t update check" 1>&2
+  exec "$CACHE/$SCRIPTNAME" "$@"
+else
+  echo "error: $URL" 1>&2
+fi