Add Debian keyring package

resources/debian/control.in

@@ -1,6 +1,6 @@
 Package: yarn
 Version: $VERSION-1
-Recommends: nodejs
+Recommends: nodejs, yarn-archive-keyring
 Conflicts: nodejs (<< 4.0.0), cmdtest
 Section: devel
 Priority: optional

resources/debian/keyring.control.in

@@ -0,0 +1,11 @@
+Package: $PACKAGE_NAME
+Version: $VERSION
+Section: misc
+Priority: optional
+Architecture: all
+Installed-Size: $INSTALLED_SIZE
+Maintainer: Yarn Developers <yarn@dan.cx>
+Homepage: https://yarnpkg.com/
+Description: GnuPG keyring for Yarn archives
+ This package ensures that the signing keys used to verify the integrity of the
+ package archive are kept updated.

scripts/build-deb-keyring.sh

@@ -0,0 +1,78 @@
+#!/usr/bin/env bash
+
+set -ex
+
+# Ensure all the tools we need are available
+ensureAvailable() {
+  command -v "$1" >/dev/null 2>&1 || (echo "You need to install $1" && exit 2)
+}
+ensureAvailable dpkg-deb
+ensureAvailable lintian
+ensureAvailable gpg
+
+# If not set, $VERSION will be the current date
+: ${VERSION:=$(date +%Y.%m.%d)}
+OUTPUT_DIR=artifacts
+PACKAGE_NAME=yarn-archive-keyring
+DEB_PACKAGE_FILE="${PACKAGE_NAME}_${VERSION}_all.deb"
+PACKAGE_TMPDIR="tmp/$PACKAGE_NAME"
+
+if (( ${#@} < 1 )); then
+  echo "Usage: $0 GPG_KEY_ID" && exit 1
+else
+  GPG_KEY_ID="$1"
+fi
+
+mkdir -p $OUTPUT_DIR
+# Remove old packages
+rm -f $OUTPUT_DIR/*.deb
+
+# Create temporary directory to start building up the package
+rm -rf $PACKAGE_TMPDIR
+mkdir -p $PACKAGE_TMPDIR/
+umask 0022 # Ensure permissions are correct (0755 for dirs, 0644 for files)
+PACKAGE_TMPDIR_ABSOLUTE=$(readlink -f $PACKAGE_TMPDIR)
+
+# Create Debian package structure
+mkdir -p "${PACKAGE_TMPDIR}/etc/apt/trusted.gpg.d"
+mkdir -p "${PACKAGE_TMPDIR}/usr/share/keyrings"
+mkdir -p "${PACKAGE_TMPDIR}/usr/share/doc/${PACKAGE_NAME}"
+cp \
+  resources/debian/copyright \
+  "${PACKAGE_TMPDIR}/usr/share/doc/${PACKAGE_NAME}/copyright"
+
+gpg \
+  --export \
+  --output "${PACKAGE_TMPDIR}/etc/apt/trusted.gpg.d/${PACKAGE_NAME}.gpg" \
+  "$GPG_KEY_ID"
+cp \
+  "${PACKAGE_TMPDIR}/etc/apt/trusted.gpg.d/${PACKAGE_NAME}.gpg" \
+  "${PACKAGE_TMPDIR}/usr/share/keyrings/${PACKAGE_NAME}.gpg"
+# No changelog file at the moment
+mkdir -p $PACKAGE_TMPDIR/usr/share/lintian/overrides/
+printf "# %s\n%s: %s\n" \
+  "No changelog file at the moment" \
+  "${PACKAGE_NAME}" \
+  "changelog-file-missing-in-native-package" \
+  > "${PACKAGE_TMPDIR}/usr/share/lintian/overrides/${PACKAGE_NAME}"
+
+# Build up the control files
+mkdir -p "${PACKAGE_TMPDIR}/DEBIAN"
+echo "/etc/apt/trusted.gpg.d/${PACKAGE_NAME}.gpg" \
+  > "${PACKAGE_TMPDIR}/DEBIAN/conffiles"
+
+# Replace variables in Debian package control file
+INSTALLED_SIZE=`du -sk $PACKAGE_TMPDIR | cut -f 1`
+sed \
+  -e "s/\$VERSION/$VERSION/" \
+  -e "s/\$INSTALLED_SIZE/$INSTALLED_SIZE/" \
+  -e "s/\$PACKAGE_NAME/$PACKAGE_NAME/" \
+  < resources/debian/keyring.control.in \
+  > $PACKAGE_TMPDIR/DEBIAN/control
+fakeroot dpkg-deb -b $PACKAGE_TMPDIR $DEB_PACKAGE_FILE
+mv $DEB_PACKAGE_FILE $OUTPUT_DIR
+
+rm -rf $PACKAGE_TMPDIR
+
+# Lint the Debian package to ensure we're not doing something silly
+lintian $OUTPUT_DIR/$DEB_PACKAGE_FILE