1 files changed, 121 insertions, 0 deletions
diff --git a/src/offload-build.in b/src/offload-build.in
new file mode 100644
index 0000000..9e9d71e
--- /dev/null
+++ b/src/offload-build.in
@@ -0,0 +1,121 @@
+#!/bin/bash
+#
+# offload-build - build a PKGBUILD on a remote server using makechrootpkg.
+#
+# Copyright (c) 2019 by Eli Schwartz <eschwartz@archlinux.org>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+source /usr/share/makepkg/util/config.sh
+
+
+# global defaults suitable for use by Arch staff
+repo=extra
+arch=x86_64
+server=build.archlinux.org
+
+die() { printf "error: $1\n" "${@:2}"; exit 1; }
+
+usage() {
+    cat <<- _EOF_
+		Usage: ${BASH_SOURCE[0]##*/} [--repo REPO] [--arch ARCHITECTURE] [--server SERVER] -- [ARCHBUILD_ARGS]
+
+		Build a PKGBUILD on a remote server using makechrootpkg. Requires a remote user
+		that can run archbuild without password auth. Options passed after a -- are
+		passed on to archbuild, and eventually to makechrootpkg.
+
+		OPTIONS
+		    -r, --repo      Build against a specific repository (current: $repo)
+		    -a, --arch      Build against a specific architecture (current: $arch)
+		    -s, --server    Offload to a specific build server (current: $server)
+		    -h, --help      Show this help text
+_EOF_
+}
+
+# option checking
+while (( $# )); do
+    case $1 in
+        -h|--help)
+            usage
+            exit 0
+            ;;
+        -r|--repo)
+            repo=$2
+            shift 2
+            ;;
+        -a|--arch)
+            arch=$2
+            shift 2
+            ;;
+        -s|--server)
+            server=$2
+            shift 2
+            ;;
+        --)
+            shift
+            break
+            ;;
+        *)
+            die "invalid argument: %s" "$1"
+            ;;
+    esac
+done
+
+# multilib must be handled specially
+archbuild_arch="${arch}"
+if [[ $repo = multilib* ]]; then
+    archbuild_arch=
+fi
+
+archbuild_cmd=("${repo}${archbuild_arch:+-$archbuild_arch}-build" "$@")
+
+trap 'rm -rf $TEMPDIR' EXIT INT TERM QUIT
+
+# Load makepkg.conf variables to be available
+load_makepkg_config
+
+# Use a source-only tarball as an intermediate to transfer files. This
+# guarantees the checksums are okay, and guarantees that all needed files are
+# transferred, including local sources, install scripts, and changelogs.
+export TEMPDIR=$(mktemp -d --tmpdir offload-build.XXXXXXXXXX)
+export SRCPKGDEST=${TEMPDIR}
+makepkg --source || die "unable to make source package"
+
+# Temporary cosmetic workaround makepkg if SRCDEST is set somewhere else
+# but an empty src dir is created in PWD. Remove once fixed in makepkg.
+rmdir --ignore-fail-on-non-empty src 2>/dev/null || true
+
+mapfile -t files < <(
+    # This is sort of bash golfing but it allows running a mildly complex
+    # command over ssh with a single connection.
+    # shellcheck disable=SC2145
+    cat "$SRCPKGDEST"/*"$SRCEXT" |
+        ssh $server '
+            temp="${XDG_CACHE_HOME:-$HOME/.cache}/offload-build" &&
+            mkdir -p "$temp" &&
+            temp=$(mktemp -d -p "$temp") &&
+            cd "$temp" &&
+            {
+                bsdtar --strip-components 1 -xvf - &&
+                script -qefc "'"${archbuild_cmd[@]@Q}"'" /dev/null &&
+                printf "%s\n" "" "-> build complete" &&
+                printf "\t%s\n" "$temp"/*
+            } >&2 &&
+            makepkg_user_config="${XDG_CONFIG_HOME:-$HOME/.config}/pacman/makepkg.conf" &&
+            makepkg_config="/usr/share/devtools/makepkg-'"${arch}"'.conf" &&
+            if [[ -f /usr/share/devtools/makepkg-'"${repo}"'-'"${arch}"'.conf ]]; then
+                makepkg_config="/usr/share/devtools/makepkg-'"${repo}"'-'"${arch}"'.conf"
+            fi &&
+            makepkg --config <(cat "${makepkg_user_config}" "${makepkg_config}" 2>/dev/null) --packagelist &&
+            printf "%s\n" "${temp}/PKGBUILD"
+')
+
+
+if (( ${#files[@]} )); then
+    printf '%s\n' '' '-> copying files...'
+    scp "${files[@]/#/$server:}" "${TEMPDIR}/"
+    mv "${TEMPDIR}"/*.pkg.tar* "${PKGDEST:-${PWD}}/"
+    mv "${TEMPDIR}/PKGBUILD" "${PWD}/"
+else
+    exit 1
+fi