1#!/bin/bash
2
3# This script is intented to wrap the execution of ninja so that we
4# can do some checks before each ninja run.
5#
6# It can either be run with a standalone Blueprint checkout to generate
7# the minibp binary, or can be used by another script as part of a custom
8# Blueprint-based build system. When used by another script, the following
9# environment variables can be set to configure this script, which are
10# documented below:
11#
12#   BUILDDIR
13#   SKIP_NINJA
14#
15# When run in a standalone Blueprint checkout, bootstrap.bash will install
16# this script into the $BUILDDIR, where it may be executed.
17#
18# For embedding into a custom build system, the current directory when this
19# script executes should be the same directory that $BOOTSTRAP should be
20# called from.
21
22set -e
23
24# BUILDDIR should be set to the path to store build results. By default,
25# this is the directory containing this script, but can be set explicitly
26# if the custom build system only wants to install their own wrapper.
27[ -z "$BUILDDIR" ] && BUILDDIR=`dirname "${BASH_SOURCE[0]}"`
28
29# .blueprint.bootstrap provides saved values from the bootstrap.bash script:
30#
31#   BOOTSTRAP
32#   BOOTSTRAP_MANIFEST
33#
34# If it doesn't exist, we probably just need to re-run bootstrap.bash, which
35# ninja will do when switching stages. So just skip to ninja.
36if [ -f "${BUILDDIR}/.blueprint.bootstrap" ]; then
37    source "${BUILDDIR}/.blueprint.bootstrap"
38
39    # Pick the newer of .bootstrap/bootstrap.ninja.in or $BOOTSTRAP_MANIFEST,
40    # and copy it to .bootstrap/build.ninja.in
41    GEN_BOOTSTRAP_MANIFEST="${BUILDDIR}/.bootstrap/bootstrap.ninja.in"
42    if [ -f "${GEN_BOOTSTRAP_MANIFEST}" ]; then
43        if [ "${GEN_BOOTSTRAP_MANIFEST}" -nt "${BOOTSTRAP_MANIFEST}" ]; then
44            BOOTSTRAP_MANIFEST="${GEN_BOOTSTRAP_MANIFEST}"
45        fi
46    fi
47
48    # Copy the selected manifest to $BUILDDIR/.bootstrap/build.ninja.in
49    mkdir -p "${BUILDDIR}/.bootstrap"
50    cp "${BOOTSTRAP_MANIFEST}" "${BUILDDIR}/.bootstrap/build.ninja.in"
51
52    # Bootstrap it to $BUILDDIR/build.ninja
53    "${BOOTSTRAP}" -i "${BUILDDIR}/.bootstrap/build.ninja.in"
54fi
55
56# SKIP_NINJA can be used by wrappers that wish to run ninja themselves.
57if [ -z "$SKIP_NINJA" ]; then
58    ninja -C "${BUILDDIR}" "$@"
59else
60    exit 0
61fi
62