Add new tool: offload-build

This tool is useful for running makechrootpkg on a remote build server,
and is by default hooked up to send a PKGBUILD and initiate a build on
our shiny new build server "dragon".

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>

2 files changed, 108 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index ba2d3e4..2306a17 100644
--- a/Makefile
+++ b/Makefile
@@ -20,6 +20,7 @@ IN_PROGS = \
 
 BINPROGS = \
 	$(IN_PROGS) \
+	offload-build \
 	sogrep
 
 CONFIGFILES = \
diff --git a/offload-build b/offload-build
new file mode 100755
index 0000000..101a146
--- /dev/null
+++ b/offload-build
@@ -0,0 +1,107 @@
+#!/bin/bash
+#
+#   offload-build - build a PKGBUILD on a remote server using makechrootpkg.
+#
+#   Copyright (c) 2019 by Eli Schwartz <eschwartz@archlinux.org>
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+
+
+# global defaults suitable for use by Arch staff
+repo=extra
+arch=x86_64
+server=dragon.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
+if [[ $repo = multilib* ]]; then
+    arch=
+fi
+
+archbuild_cmd=("${repo}${arch:+-$arch}-build" "$@")
+
+trap 'rm -rf $SRCPKGDEST' EXIT
+
+# Use a source-only tarball as an intermediate to transfer files. This
+# guarantees the checksums are okay, and guarantees that all needed files are
+# transferred, including local sources, install scripts, and changelogs.
+export SRCPKGDEST=$(mktemp -d)
+makepkg --source || die "unable to make source package"
+
+mapfile -t files < <(
+    # This is sort of bash golfing but it allows running a mildly complex
+    # command over ssh with a single connection.
+    cat "$SRCPKGDEST"/*.src.tar.gz |
+        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 --packagelist
+')
+
+(( ${#files[@]} )) && printf '%s\n' '' '-> copying files...' && scp "${files[@]/#/$server:}" .