hadrian: Add bootstrap scripts for building without cabal-install

These scripts are originally from the cabal-install repo with a few
small tweaks.

This utility allows you to build hadrian without cabal-install, which can be useful
for packagers. If you are a developer then build hadrian using cabal-install.

If you want to bootstrap with ghc-8.10.5 then run the ./bootstrap script with the
`plan-bootstrap-8.10.5.json` file.

    bootstrap.py -d plan-bootstrap-8.10.5.json -w /path/to-ghc

The result of the bootstrap script will be a hadrian binary in
`_build/bin/hadrian`.

There is a script (using nix) which can be used to generate the bootstrap plans for the range
of supported GHC versions using nix.

    generate_bootstrap_plans

Otherwise you can run the commands in ./generate_bootstrap_plans directly.

Fixes #17103

18 files changed, 695 insertions, 0 deletions

diff --git a/hadrian/bootstrap/README.md b/hadrian/bootstrap/README.md
new file mode 100644
index 0000000000..c82ace0669
--- /dev/null
+++ b/hadrian/bootstrap/README.md
@@ -0,0 +1,23 @@
+# Bootstrapping hadrian
+
+These scripts are originally from the cabal-install repo with a few
+small tweaks.
+
+This utility allows you to build hadrian without cabal-install, which can be useful
+for packagers. If you are a developer then build hadrian using cabal-install.
+
+If you want to bootstrap with ghc-8.10.5 then run the ./bootstrap script with the
+`plan-bootstrap-8.10.5.json` file.
+
+    bootstrap.py -d plan-bootstrap-8.10.5.json -w /path/to-ghc
+
+The result of the bootstrap script will be a hadrian binary in
+`_build/bin/hadrian`.
+
+There is a script (using nix) which can be used to generate the bootstrap plans for the range
+of supported GHC versions using nix.
+
+    generate_bootstrap_plans
+
+Otherwise you can run the commands in ./generate_bootstrap_plans directly.
+
diff --git a/hadrian/bootstrap/bootstrap.py b/hadrian/bootstrap/bootstrap.py
new file mode 100755
index 0000000000..8ed4d5588c
--- /dev/null
+++ b/hadrian/bootstrap/bootstrap.py
@@ -0,0 +1,388 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+bootstrap.py - bootstrapping utility for hadrian
+
+See bootstrap/README.md for usage instructions.
+"""
+
+USAGE = """
+This utility is only intended for use in building hadrian
+on a new platform. If you already have a functional cabal-install
+please rather run `cabal build hadrian .`. or `./hadrian/build`
+"""
+
+from enum import Enum
+import hashlib
+import logging
+import json
+from pathlib import Path
+import platform
+import shutil
+import subprocess
+from textwrap import dedent
+from typing import Set, Optional, Dict, List, Tuple, \
+                   NewType, BinaryIO, NamedTuple, TypeVar
+
+#logging.basicConfig(level=logging.INFO)
+
+BUILDDIR    = Path('_build')
+
+BINDIR      = BUILDDIR / 'bin'            # binaries go there (--bindir)
+DISTDIR     = BUILDDIR / 'dists'          # --builddir
+UNPACKED    = BUILDDIR / 'unpacked'       # where we unpack tarballs
+TARBALLS    = BUILDDIR / 'tarballs'       # where we download tarballks
+PSEUDOSTORE = BUILDDIR / 'pseudostore'    # where we install packages
+ARTIFACTS   = BUILDDIR / 'artifacts'      # Where we put the archive
+TMPDIR      = BUILDDIR / 'tmp'            #
+PKG_DB      = BUILDDIR / 'packages.conf'  # package db
+
+PackageName = NewType('PackageName', str)
+Version = NewType('Version', str)
+SHA256Hash = NewType('SHA256Hash', str)
+
+class PackageSource(Enum):
+    HACKAGE = 'hackage'
+    LOCAL = 'local'
+
+BuiltinDep = NamedTuple('BuiltinDep', [
+    ('package', PackageName),
+    ('version', Version),
+])
+
+BootstrapDep = NamedTuple('BootstrapDep', [
+    ('package', PackageName),
+    ('version', Version),
+    ('source', PackageSource),
+    # source tarball SHA256
+    ('src_sha256', Optional[SHA256Hash]),
+    # `revision` is only valid when source == HACKAGE.
+    ('revision', Optional[int]),
+    ('cabal_sha256', Optional[SHA256Hash]),
+    ('flags', List[str]),
+])
+
+BootstrapInfo = NamedTuple('BootstrapInfo', [
+    ('builtin', List[BuiltinDep]),
+    ('dependencies', List[BootstrapDep]),
+])
+
+class Compiler:
+    def __init__(self, ghc_path: Path):
+        if not ghc_path.is_file():
+            raise TypeError(f'GHC {ghc_path} is not a file')
+
+        self.ghc_path = ghc_path.resolve()
+
+        info = self._get_ghc_info()
+        self.version = info['Project version']
+        #self.lib_dir = Path(info['LibDir'])
+        #self.ghc_pkg_path = (self.lib_dir / 'bin' / 'ghc-pkg').resolve()
+        self.ghc_pkg_path = (self.ghc_path.parent / 'ghc-pkg').resolve()
+        if not self.ghc_pkg_path.is_file():
+            raise TypeError(f'ghc-pkg {self.ghc_pkg_path} is not a file')
+
+    def _get_ghc_info(self) -> Dict[str,str]:
+        from ast import literal_eval
+        p = subprocess_run([self.ghc_path, '--info'], stdout=subprocess.PIPE, check=True, encoding='UTF-8')
+        out = p.stdout.replace('\n', '').strip()
+        return dict(literal_eval(out))
+
+PackageSpec = Tuple[PackageName, Version]
+
+class BadTarball(Exception):
+    def __init__(self, path: Path, expected_sha256: SHA256Hash, found_sha256: SHA256Hash):
+        self.path = path
+        self.expected_sha256 = expected_sha256
+        self.found_sha256 = found_sha256
+
+    def __str__(self):
+        return '\n'.join([
+            f'Bad tarball hash: {str(self.path)}',
+            f'  expected: {self.expected_sha256}',
+            f'  found:    {self.found_sha256}',
+        ])
+
+def package_url(package: PackageName, version: Version) -> str:
+    return f'http://hackage.haskell.org/package/{package}-{version}/{package}-{version}.tar.gz'
+
+def package_cabal_url(package: PackageName, version: Version, revision: int) -> str:
+    return f'http://hackage.haskell.org/package/{package}-{version}/revision/{revision}.cabal'
+
+def verify_sha256(expected_hash: SHA256Hash, f: Path):
+    h = hash_file(hashlib.sha256(), f.open('rb'))
+    if h != expected_hash:
+        raise BadTarball(f, expected_hash, h)
+
+def fetch_package(package: PackageName,
+                  version: Version,
+                  src_sha256: SHA256Hash,
+                  revision: Optional[int],
+                  cabal_sha256: Optional[SHA256Hash],
+                  ) -> (Path, Path):
+    import urllib.request
+
+    # Download source distribution
+    tarball = TARBALLS / f'{package}-{version}.tar.gz'
+    if not tarball.exists():
+        print(f'Fetching {package}-{version}...')
+        tarball.parent.mkdir(parents=True, exist_ok=True)
+        url = package_url(package, version)
+        with urllib.request.urlopen(url) as resp:
+            shutil.copyfileobj(resp, tarball.open('wb'))
+
+    verify_sha256(src_sha256, tarball)
+
+    # Download revised cabal file
+    cabal_file = TARBALLS / f'{package}.cabal'
+    if revision is not None and not cabal_file.exists():
+        assert cabal_sha256 is not None
+        url = package_cabal_url(package, version, revision)
+        with urllib.request.urlopen(url) as resp:
+            shutil.copyfileobj(resp, cabal_file.open('wb'))
+            verify_sha256(cabal_sha256, cabal_file)
+
+    return (tarball, cabal_file)
+
+def read_bootstrap_info(path: Path) -> BootstrapInfo:
+    obj = json.load(path.open())
+
+    def bi_from_json(o: dict) -> BuiltinDep:
+        return BuiltinDep(**o)
+
+    def dep_from_json(o: dict) -> BootstrapDep:
+        o['source'] = PackageSource(o['source'])
+        return BootstrapDep(**o)
+
+    builtin = [bi_from_json(dep) for dep in obj['builtin'] ]
+    deps = [dep_from_json(dep) for dep in obj['dependencies'] ]
+
+    return BootstrapInfo(dependencies=deps, builtin=builtin)
+
+def check_builtin(dep: BuiltinDep, ghc: Compiler) -> None:
+    subprocess_run([str(ghc.ghc_pkg_path), 'describe', f'{dep.package}-{dep.version}'],
+                   check=True, stdout=subprocess.DEVNULL)
+    print(f'Using {dep.package}-{dep.version} from GHC...')
+    return
+
+def install_dep(dep: BootstrapDep, ghc: Compiler) -> None:
+    dist_dir = (DISTDIR / f'{dep.package}-{dep.version}').resolve()
+
+    if dep.source == PackageSource.HACKAGE:
+        assert dep.src_sha256 is not None
+        (tarball, cabal_file) = fetch_package(dep.package, dep.version, dep.src_sha256,
+                                dep.revision, dep.cabal_sha256)
+        UNPACKED.mkdir(parents=True, exist_ok=True)
+        shutil.unpack_archive(tarball.resolve(), UNPACKED, 'gztar')
+        sdist_dir = UNPACKED / f'{dep.package}-{dep.version}'
+
+        # Update cabal file with revision
+        if dep.revision is not None:
+            shutil.copyfile(cabal_file, sdist_dir / f'{dep.package}.cabal')
+
+    elif dep.source == PackageSource.LOCAL:
+        if dep.package == 'hadrian':
+            sdist_dir = Path('../').resolve()
+        else:
+            raise ValueError(f'Unknown local package {dep.package}')
+
+    install_sdist(dist_dir, sdist_dir, ghc, dep.flags)
+
+def install_sdist(dist_dir: Path, sdist_dir: Path, ghc: Compiler, flags: List[str]):
+    prefix = PSEUDOSTORE.resolve()
+    flags_option = ' '.join(flags)
+    setup_dist_dir = dist_dir / 'setup'
+    setup = setup_dist_dir / 'Setup'
+
+    build_args = [
+        f'--builddir={dist_dir}',
+    ]
+
+    configure_args = build_args + [
+        f'--package-db={PKG_DB.resolve()}',
+        f'--prefix={prefix}',
+        f'--bindir={BINDIR.resolve()}',
+        f'--with-compiler={ghc.ghc_path}',
+        f'--with-hc-pkg={ghc.ghc_pkg_path}',
+        f'--flags={flags_option}',
+    ]
+
+    def check_call(args: List[str]) -> None:
+        subprocess_run(args, cwd=sdist_dir, check=True)
+
+    setup_dist_dir.mkdir(parents=True, exist_ok=True)
+
+
+    setup_file = sdist_dir / 'Setup.hs'
+    if not setup_file.exists():
+        with open(setup_file, 'w') as setup_out:
+            setup_out.write('import Distribution.Simple\nmain = defaultMain')
+
+    # Note: we pass -i so GHC doesn't look for anything else
+    # This should be fine for cabal-install dependencies.
+    check_call([str(ghc.ghc_path), '--make', '-package-env=-', '-i', f'-odir={setup_dist_dir}', f'-hidir={setup_dist_dir}', '-o', setup, 'Setup'])
+    check_call([setup, 'configure'] + configure_args)
+    check_call([setup, 'build'] + build_args)
+    check_call([setup, 'install'] + build_args)
+
+def hash_file(h, f: BinaryIO) -> SHA256Hash:
+    while True:
+        d = f.read(1024)
+        if len(d) == 0:
+            return SHA256Hash(h.hexdigest())
+
+        h.update(d)
+
+
+# Cabal plan.json representation
+UnitId = NewType('UnitId', str)
+PlanUnit = NewType('PlanUnit', dict)
+
+def bootstrap(info: BootstrapInfo, ghc: Compiler) -> None:
+    if not PKG_DB.exists():
+        print(f'Creating package database {PKG_DB}')
+        PKG_DB.parent.mkdir(parents=True, exist_ok=True)
+        subprocess_run([ghc.ghc_pkg_path, 'init', PKG_DB])
+
+    for dep in info.builtin:
+        check_builtin(dep, ghc)
+
+    for dep in info.dependencies:
+        install_dep(dep, ghc)
+
+# Steps
+#######################################################################
+
+def linuxname(i, r):
+  i = i.strip() # id
+  r = r.strip() # release
+  if i == '': return 'linux'
+  else: return f"{i}-{r}".lower()
+
+def macname(macver):
+  # https://en.wikipedia.org/wiki/MacOS_version_history#Releases
+  if macver.startswith('10.12.'): return 'sierra'
+  if macver.startswith('10.13.'): return 'high-sierra'
+  if macver.startswith('10.14.'): return 'mojave'
+  if macver.startswith('10.15.'): return 'catalina'
+  if macver.startswith('11.0.'): return 'big-sur'
+  else: return macver
+
+def archive_name(version):
+    # Ask platform information
+    machine = platform.machine()
+    if machine == '': machine = "unknown"
+
+    system = platform.system().lower()
+    if system == '': system = "unknown"
+
+    version = system
+    if system == 'linux':
+        try:
+            i = subprocess_run(['lsb_release', '-si'], stdout=subprocess.PIPE, encoding='UTF-8')
+            r = subprocess_run(['lsb_release', '-sr'], stdout=subprocess.PIPE, encoding='UTF-8')
+            version = linuxname(i.stdout, r.stdout)
+        except:
+            try:
+                with open('/etc/alpine-release') as f:
+                    alpinever = f.read().strip()
+                    return f'alpine-{alpinever}'
+            except:
+                pass
+    elif system == 'darwin':
+        version = 'darwin-' + macname(platform.mac_ver()[0])
+    elif system == 'freebsd':
+        version = 'freebsd-' + platform.release().lower()
+
+    return f'hadrian-{version}-{machine}-{version}'
+
+def make_archive(hadrian_path):
+    import tempfile
+
+    print(f'Creating distribution tarball')
+
+    # Get bootstrapped hadrian version
+    # This also acts as smoke test
+    p = subprocess_run([hadrian_path, '--numeric-version'], stdout=subprocess.PIPE, check=True, encoding='UTF-8')
+    cabalversion = p.stdout.replace('\n', '').strip()
+
+    # Archive name
+    basename = ARTIFACTS.resolve() / (archive_name(cabalversion) + '-bootstrapped')
+
+    # In temporary directory, create a directory which we will archive
+    tmpdir = TMPDIR.resolve()
+    tmpdir.mkdir(parents=True, exist_ok=True)
+
+    rootdir = Path(tempfile.mkdtemp(dir=tmpdir))
+    shutil.copy(hadrian_path, rootdir / 'hadrian')
+
+    # Make archive...
+    fmt = 'xztar'
+    if platform.system() == 'Windows': fmt = 'zip'
+    archivename = shutil.make_archive(basename, fmt, rootdir)
+
+    return archivename
+
+def main() -> None:
+    import argparse
+    parser = argparse.ArgumentParser(
+        description="bootstrapping utility for hadrian.",
+        epilog = USAGE,
+        formatter_class = argparse.RawDescriptionHelpFormatter)
+    parser.add_argument('-d', '--deps', type=Path, default='bootstrap-deps.json',
+                        help='bootstrap dependency file')
+    parser.add_argument('-w', '--with-compiler', type=Path,
+                        help='path to GHC')
+    args = parser.parse_args()
+
+    # Find compiler
+    if args.with_compiler is None:
+        path = shutil.which('ghc')
+        if path is None:
+            raise ValueError("Couldn't find ghc in PATH")
+        ghc = Compiler(Path(path))
+    else:
+        ghc = Compiler(args.with_compiler)
+
+    print(f'Bootstrapping hadrian with GHC {ghc.version} at {ghc.ghc_path}...')
+
+    print(dedent("""
+        DO NOT use this script if you have another recent cabal-install available.
+        This script is intended only for bootstrapping hadrian on new
+        architectures.
+    """))
+
+    info = read_bootstrap_info(args.deps)
+    bootstrap(info, ghc)
+    hadrian_path = (BINDIR / 'hadrian').resolve()
+
+    archive = make_archive(hadrian_path)
+
+    print(dedent(f'''
+        Bootstrapping finished!
+
+        The resulting hadrian executable can be found at
+
+            {hadrian_path}
+
+        It have been archived for distribution in
+
+            {archive}
+
+        You can use this executable to build GHC.
+    '''))
+
+def subprocess_run(args, **kwargs):
+    "Like subprocess.run, but also print what we run"
+
+    args_str = ' '.join(map(str, args))
+    extras = ''
+    if 'cwd' in kwargs:
+        extras += f' cwd={kwargs["cwd"]}'
+    print(f'bootstrap: running{extras} {args_str}')
+
+    return subprocess.run(args, **kwargs)
+
+if __name__ == '__main__':
+    main()
diff --git a/hadrian/bootstrap/cabal.project b/hadrian/bootstrap/cabal.project
new file mode 100644
index 0000000000..e6fdbadb43
--- /dev/null
+++ b/hadrian/bootstrap/cabal.project
@@ -0,0 +1 @@
+packages: .
diff --git a/hadrian/bootstrap/generate_bootstrap_plans b/hadrian/bootstrap/generate_bootstrap_plans
new file mode 100755
index 0000000000..167559aa53
--- /dev/null
+++ b/hadrian/bootstrap/generate_bootstrap_plans
@@ -0,0 +1,18 @@
+ghcs_nix="https://gitlab.haskell.org/bgamari/ghcs-nix/-/archive/master/ghcs-nix-master.tar.gz"
+
+run() {
+  local ver="$1"
+  local drv="ghc-$ver"
+  echo "$ver"
+  nix build -f "$ghcs_nix" $drv
+  (cd ../; rm -r dist-newstyle; cabal configure hadrian -w bootstrap/result/bin/ghc)
+  cp ../dist-newstyle/cache/plan.json "plan-$ver.json"
+  cabal run -v0 hadrian-bootstrap-gen -- "plan-$ver.json" | tee "plan-bootstrap-$ver.json"
+}
+
+run "8_10_1"
+# run "8_10_2" Broken
+run "8_10_3"
+run "8_10_4"
+run "8_10_5"
+run "9_0_1"
diff --git a/hadrian/bootstrap/hadrian-bootstrap-gen.cabal b/hadrian/bootstrap/hadrian-bootstrap-gen.cabal
new file mode 100644
index 0000000000..977af35468
--- /dev/null
+++ b/hadrian/bootstrap/hadrian-bootstrap-gen.cabal
@@ -0,0 +1,20 @@
+cabal-version: 2.2
+name:          hadrian-bootstrap-gen
+version:       0
+
+executable hadrian-bootstrap-gen
+  default-language: Haskell2010
+  hs-source-dirs:   src
+  ghc-options:      -Wall
+  main-is:          Main.hs
+  build-depends:
+    , aeson                  ^>=1.5.2.0
+    , base                   ^>=4.12.0.0 || ^>=4.13.0.0 || ^>=4.14.0.0
+    , bytestring             ^>=0.10.8.2
+    , Cabal                  ^>=3.2.0.0
+    , cabal-install-parsers  ^>=0.3.0.1
+    , cabal-plan             ^>=0.7.0.0
+    , containers             ^>=0.6.0.1
+    , text                   ^>=1.2.3.0
+    , topograph              ^>=1.0.0.1
+    , transformers           ^>=0.5.6.2
diff --git a/hadrian/bootstrap/plan-8_10_1.json b/hadrian/bootstrap/plan-8_10_1.json
new file mode 100644
index 0000000000..3dd477cf8e
--- /dev/null
+++ b/hadrian/bootstrap/plan-8_10_1.json
@@ -0,0 +1 @@
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diff --git a/hadrian/bootstrap/plan-8_10_2.json b/hadrian/bootstrap/plan-8_10_2.json
new file mode 100644
index 0000000000..dc9fff4bc1
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diff --git a/hadrian/bootstrap/plan-8_10_3.json b/hadrian/bootstrap/plan-8_10_3.json
new file mode 100644
index 0000000000..2cb9d47551
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diff --git a/hadrian/bootstrap/plan-8_10_4.json b/hadrian/bootstrap/plan-8_10_4.json
new file mode 100644
index 0000000000..7babd506d7
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diff --git a/hadrian/bootstrap/plan-8_10_5.json b/hadrian/bootstrap/plan-8_10_5.json
new file mode 100644
index 0000000000..b8002cbb76
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diff --git a/hadrian/bootstrap/plan-9_0_1.json b/hadrian/bootstrap/plan-9_0_1.json
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diff --git a/hadrian/bootstrap/plan-bootstrap-8_10_1.json b/hadrian/bootstrap/plan-bootstrap-8_10_1.json
new file mode 100644
index 0000000000..bcc9add71a
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\ No newline at end of file
diff --git a/hadrian/bootstrap/plan-bootstrap-8_10_2.json b/hadrian/bootstrap/plan-bootstrap-8_10_2.json
new file mode 100644
index 0000000000..4fcbffd9c5
--- /dev/null
+++ b/hadrian/bootstrap/plan-bootstrap-8_10_2.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/hadrian/bootstrap/plan-bootstrap-8_10_3.json b/hadrian/bootstrap/plan-bootstrap-8_10_3.json
new file mode 100644
index 0000000000..0b76a18a2b
--- /dev/null
+++ b/hadrian/bootstrap/plan-bootstrap-8_10_3.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/hadrian/bootstrap/plan-bootstrap-8_10_4.json b/hadrian/bootstrap/plan-bootstrap-8_10_4.json
new file mode 100644
index 0000000000..12977226c6
--- /dev/null
+++ b/hadrian/bootstrap/plan-bootstrap-8_10_4.json
@@ -0,0 +1 @@
+{"dependencies":[{"source":"hackage","package":"splitmix","version":"0.1.0.3","flags":["-optimised-mixer"],"cabal_sha256":"fc3aae74c467f4b608050bef53aec17904a618731df9407e655d8f3bf8c32d5c","src_sha256":"46009f4b000c9e6613377767b8718bf38476469f2a8e2162d98cc246882d5a35","revision":0},{"source":"hackage","package":"random","version":"1.2.0","flags":[],"cabal_sha256":"195506fedaa7c31c1fa2a747e9b49b4a5d1f0b09dd8f1291f23a771656faeec3","src_sha256":"e4519cf7c058bfd5bdbe4acc782284acc9e25e74487208619ca83cbcd63fb9de","revision":6},{"source":"hackage","package":"QuickCheck","version":"2.14.2","flags":["-old-random","+templatehaskell"],"cabal_sha256":"4ce29211223d5e6620ebceba34a3ca9ccf1c10c0cf387d48aea45599222ee5aa","src_sha256":"d87b6c85696b601175274361fa62217894401e401e150c3c5d4013ac53cd36f3","revision":0},{"source":"hackage","package":"clock","version":"0.8.2","flags":["-llvm"],"cabal_sha256":"473ffd59765cc67634bdc55b63c699a85addf3a024089073ec2a862881e83e2a","src_sha256":"0b5db110c703e68b251d5883253a934b012110b45393fc65df1b095eb9a4e461","revision":0},{"source":"hackage","package":"extra","version":"1.7.9","flags":[],"cabal_sha256":"f1dec740f0f2025790c540732bfd52c556ec55bde4f5dfd7cf18e22bd44ff3d0","src_sha256":"f66e26a63b216f0ca33665a75c08eada0a96af192ace83a18d87839d79afdf9d","revision":0},{"source":"hackage","package":"filepattern","version":"0.1.2","flags":[],"cabal_sha256":"aec816ff25418d1b03ba75189e568f490eb86efc47f586d43363fa338e422e81","src_sha256":"d92912ee0db0b8c50d6b2ffdc1ae91ee30e2704b47896aa325b42b58a2fcf65b","revision":0},{"source":"hackage","package":"hashable","version":"1.3.1.0","flags":["+integer-gmp"],"cabal_sha256":"d965e098e06cc585b201da6137dcb31c40f35eb7a937b833903969447985c076","src_sha256":"8061823a4ac521b53912edcba36b956f3159cb885b07ec119af295a6568ca7c4","revision":0},{"source":"hackage","package":"heaps","version":"0.4","flags":[],"cabal_sha256":"66b19fcd813b0e4db3e0bac541bd46606c3b13d3d081d9f9666f4be0f5ff14b8","src_sha256":"89329df8b95ae99ef272e41e7a2d0fe2f1bb7eacfcc34bc01664414b33067cfd","revision":0},{"source":"hackage","package":"js-dgtable","version":"0.5.2","flags":[],"cabal_sha256":"f75cb4fa53c88c65794becdd48eb0d3b2b8abd89a3d5c19e87af91f5225c15e4","src_sha256":"e28dd65bee8083b17210134e22e01c6349dc33c3b7bd17705973cd014e9f20ac","revision":0},{"source":"hackage","package":"js-flot","version":"0.8.3","flags":[],"cabal_sha256":"4c1c447a9a2fba0adba6d30678302a30c32b9dfde9e7aa9e9156483e1545096d","src_sha256":"1ba2f2a6b8d85da76c41f526c98903cbb107f8642e506c072c1e7e3c20fe5e7a","revision":0},{"source":"hackage","package":"js-jquery","version":"3.3.1","flags":[],"cabal_sha256":"59ab6c79159549ef94b584abce8e6d3b336014c2cce1337b59a8f637e2856df5","src_sha256":"e0e0681f0da1130ede4e03a051630ea439c458cb97216cdb01771ebdbe44069b","revision":0},{"source":"hackage","package":"primitive","version":"0.7.1.0","flags":[],"cabal_sha256":"29de6bfd0cf8ba023ceb806203dfbec0e51e3524e75ffe41056f70b4229c6f0f","src_sha256":"6bebecfdf2a57787d9fd5231bfd612b65a92edd7b33a973b2a0f11312b89a3f0","revision":3},{"source":"hackage","package":"unordered-containers","version":"0.2.13.0","flags":["-debug"],"cabal_sha256":"6310c636f92ed4908fdd0de582b6be31c2851c7b5f2ec14e9f416eb94df7a078","src_sha256":"86b01369ab8eb311383a052d389337e2cd71a63088323f02932754df4aa37b55","revision":0},{"source":"hackage","package":"utf8-string","version":"1.0.2","flags":[],"cabal_sha256":"79416292186feeaf1f60e49ac5a1ffae9bf1b120e040a74bf0e81ca7f1d31d3f","src_sha256":"ee48deada7600370728c4156cb002441de770d0121ae33a68139a9ed9c19b09a","revision":0},{"source":"hackage","package":"shake","version":"0.19.4","flags":["-cloud","-embed-files","-portable"],"cabal_sha256":"be81f7c69137e639812380047dfbbdd253ca536cc919504c3bc0f14517e80eb9","src_sha256":"5bae8873f628113604159f650802edb249dfbe5802c4612751f680ac987d73ee","revision":0},{"source":"local","package":"hadrian","version":"0.1.0.0","flags":["+threaded"],"cabal_sha256":null,"src_sha256":null,"revision":null}],"builtin":[{"package":"rts","version":"1.0"},{"package":"ghc-prim","version":"0.6.1"},{"package":"integer-gmp","version":"1.0.3.0"},{"package":"base","version":"4.14.1.0"},{"package":"array","version":"0.5.4.0"},{"package":"deepseq","version":"1.4.4.0"},{"package":"bytestring","version":"0.10.12.0"},{"package":"containers","version":"0.6.2.1"},{"package":"binary","version":"0.8.8.0"},{"package":"filepath","version":"1.4.2.1"},{"package":"time","version":"1.9.3"},{"package":"unix","version":"2.7.2.2"},{"package":"directory","version":"1.3.6.0"},{"package":"transformers","version":"0.5.6.2"},{"package":"mtl","version":"2.2.2"},{"package":"ghc-boot-th","version":"8.10.4"},{"package":"pretty","version":"1.1.3.6"},{"package":"template-haskell","version":"2.16.0.0"},{"package":"text","version":"1.2.4.1"},{"package":"parsec","version":"3.1.14.0"},{"package":"process","version":"1.6.9.0"},{"package":"Cabal","version":"3.2.1.0"}]}
\ No newline at end of file
diff --git a/hadrian/bootstrap/plan-bootstrap-8_10_5.json b/hadrian/bootstrap/plan-bootstrap-8_10_5.json
new file mode 100644
index 0000000000..b978a67f84
--- /dev/null
+++ b/hadrian/bootstrap/plan-bootstrap-8_10_5.json
@@ -0,0 +1 @@
+{"dependencies":[{"source":"hackage","package":"splitmix","version":"0.1.0.3","flags":["-optimised-mixer"],"cabal_sha256":"fc3aae74c467f4b608050bef53aec17904a618731df9407e655d8f3bf8c32d5c","src_sha256":"46009f4b000c9e6613377767b8718bf38476469f2a8e2162d98cc246882d5a35","revision":0},{"source":"hackage","package":"random","version":"1.2.0","flags":[],"cabal_sha256":"195506fedaa7c31c1fa2a747e9b49b4a5d1f0b09dd8f1291f23a771656faeec3","src_sha256":"e4519cf7c058bfd5bdbe4acc782284acc9e25e74487208619ca83cbcd63fb9de","revision":6},{"source":"hackage","package":"QuickCheck","version":"2.14.2","flags":["-old-random","+templatehaskell"],"cabal_sha256":"4ce29211223d5e6620ebceba34a3ca9ccf1c10c0cf387d48aea45599222ee5aa","src_sha256":"d87b6c85696b601175274361fa62217894401e401e150c3c5d4013ac53cd36f3","revision":0},{"source":"hackage","package":"clock","version":"0.8.2","flags":["-llvm"],"cabal_sha256":"473ffd59765cc67634bdc55b63c699a85addf3a024089073ec2a862881e83e2a","src_sha256":"0b5db110c703e68b251d5883253a934b012110b45393fc65df1b095eb9a4e461","revision":0},{"source":"hackage","package":"extra","version":"1.7.9","flags":[],"cabal_sha256":"f1dec740f0f2025790c540732bfd52c556ec55bde4f5dfd7cf18e22bd44ff3d0","src_sha256":"f66e26a63b216f0ca33665a75c08eada0a96af192ace83a18d87839d79afdf9d","revision":0},{"source":"hackage","package":"filepattern","version":"0.1.2","flags":[],"cabal_sha256":"aec816ff25418d1b03ba75189e568f490eb86efc47f586d43363fa338e422e81","src_sha256":"d92912ee0db0b8c50d6b2ffdc1ae91ee30e2704b47896aa325b42b58a2fcf65b","revision":0},{"source":"hackage","package":"hashable","version":"1.3.1.0","flags":["+integer-gmp"],"cabal_sha256":"d965e098e06cc585b201da6137dcb31c40f35eb7a937b833903969447985c076","src_sha256":"8061823a4ac521b53912edcba36b956f3159cb885b07ec119af295a6568ca7c4","revision":0},{"source":"hackage","package":"heaps","version":"0.4","flags":[],"cabal_sha256":"66b19fcd813b0e4db3e0bac541bd46606c3b13d3d081d9f9666f4be0f5ff14b8","src_sha256":"89329df8b95ae99ef272e41e7a2d0fe2f1bb7eacfcc34bc01664414b33067cfd","revision":0},{"source":"hackage","package":"js-dgtable","version":"0.5.2","flags":[],"cabal_sha256":"f75cb4fa53c88c65794becdd48eb0d3b2b8abd89a3d5c19e87af91f5225c15e4","src_sha256":"e28dd65bee8083b17210134e22e01c6349dc33c3b7bd17705973cd014e9f20ac","revision":0},{"source":"hackage","package":"js-flot","version":"0.8.3","flags":[],"cabal_sha256":"4c1c447a9a2fba0adba6d30678302a30c32b9dfde9e7aa9e9156483e1545096d","src_sha256":"1ba2f2a6b8d85da76c41f526c98903cbb107f8642e506c072c1e7e3c20fe5e7a","revision":0},{"source":"hackage","package":"js-jquery","version":"3.3.1","flags":[],"cabal_sha256":"59ab6c79159549ef94b584abce8e6d3b336014c2cce1337b59a8f637e2856df5","src_sha256":"e0e0681f0da1130ede4e03a051630ea439c458cb97216cdb01771ebdbe44069b","revision":0},{"source":"hackage","package":"primitive","version":"0.7.1.0","flags":[],"cabal_sha256":"29de6bfd0cf8ba023ceb806203dfbec0e51e3524e75ffe41056f70b4229c6f0f","src_sha256":"6bebecfdf2a57787d9fd5231bfd612b65a92edd7b33a973b2a0f11312b89a3f0","revision":3},{"source":"hackage","package":"unordered-containers","version":"0.2.13.0","flags":["-debug"],"cabal_sha256":"6310c636f92ed4908fdd0de582b6be31c2851c7b5f2ec14e9f416eb94df7a078","src_sha256":"86b01369ab8eb311383a052d389337e2cd71a63088323f02932754df4aa37b55","revision":0},{"source":"hackage","package":"utf8-string","version":"1.0.2","flags":[],"cabal_sha256":"79416292186feeaf1f60e49ac5a1ffae9bf1b120e040a74bf0e81ca7f1d31d3f","src_sha256":"ee48deada7600370728c4156cb002441de770d0121ae33a68139a9ed9c19b09a","revision":0},{"source":"hackage","package":"shake","version":"0.19.4","flags":["-cloud","-embed-files","-portable"],"cabal_sha256":"be81f7c69137e639812380047dfbbdd253ca536cc919504c3bc0f14517e80eb9","src_sha256":"5bae8873f628113604159f650802edb249dfbe5802c4612751f680ac987d73ee","revision":0},{"source":"local","package":"hadrian","version":"0.1.0.0","flags":["+threaded"],"cabal_sha256":null,"src_sha256":null,"revision":null}],"builtin":[{"package":"rts","version":"1.0.1"},{"package":"ghc-prim","version":"0.6.1"},{"package":"integer-gmp","version":"1.0.3.0"},{"package":"base","version":"4.14.2.0"},{"package":"array","version":"0.5.4.0"},{"package":"deepseq","version":"1.4.4.0"},{"package":"bytestring","version":"0.10.12.0"},{"package":"containers","version":"0.6.4.1"},{"package":"binary","version":"0.8.8.0"},{"package":"filepath","version":"1.4.2.1"},{"package":"time","version":"1.9.3"},{"package":"unix","version":"2.7.2.2"},{"package":"directory","version":"1.3.6.0"},{"package":"transformers","version":"0.5.6.2"},{"package":"mtl","version":"2.2.2"},{"package":"ghc-boot-th","version":"8.10.5"},{"package":"pretty","version":"1.1.3.6"},{"package":"template-haskell","version":"2.16.0.0"},{"package":"text","version":"1.2.4.1"},{"package":"parsec","version":"3.1.14.0"},{"package":"process","version":"1.6.9.0"},{"package":"Cabal","version":"3.2.1.0"}]}
\ No newline at end of file
diff --git a/hadrian/bootstrap/plan-bootstrap-9_0_1.json b/hadrian/bootstrap/plan-bootstrap-9_0_1.json
new file mode 100644
index 0000000000..f166623da5
--- /dev/null
+++ b/hadrian/bootstrap/plan-bootstrap-9_0_1.json
@@ -0,0 +1 @@
+{"dependencies":[{"source":"hackage","package":"splitmix","version":"0.1.0.3","flags":["-optimised-mixer"],"cabal_sha256":"fc3aae74c467f4b608050bef53aec17904a618731df9407e655d8f3bf8c32d5c","src_sha256":"46009f4b000c9e6613377767b8718bf38476469f2a8e2162d98cc246882d5a35","revision":0},{"source":"hackage","package":"random","version":"1.2.0","flags":[],"cabal_sha256":"195506fedaa7c31c1fa2a747e9b49b4a5d1f0b09dd8f1291f23a771656faeec3","src_sha256":"e4519cf7c058bfd5bdbe4acc782284acc9e25e74487208619ca83cbcd63fb9de","revision":6},{"source":"hackage","package":"QuickCheck","version":"2.14.2","flags":["-old-random","+templatehaskell"],"cabal_sha256":"4ce29211223d5e6620ebceba34a3ca9ccf1c10c0cf387d48aea45599222ee5aa","src_sha256":"d87b6c85696b601175274361fa62217894401e401e150c3c5d4013ac53cd36f3","revision":0},{"source":"hackage","package":"clock","version":"0.8.2","flags":["-llvm"],"cabal_sha256":"473ffd59765cc67634bdc55b63c699a85addf3a024089073ec2a862881e83e2a","src_sha256":"0b5db110c703e68b251d5883253a934b012110b45393fc65df1b095eb9a4e461","revision":0},{"source":"hackage","package":"extra","version":"1.7.9","flags":[],"cabal_sha256":"f1dec740f0f2025790c540732bfd52c556ec55bde4f5dfd7cf18e22bd44ff3d0","src_sha256":"f66e26a63b216f0ca33665a75c08eada0a96af192ace83a18d87839d79afdf9d","revision":0},{"source":"hackage","package":"filepattern","version":"0.1.2","flags":[],"cabal_sha256":"aec816ff25418d1b03ba75189e568f490eb86efc47f586d43363fa338e422e81","src_sha256":"d92912ee0db0b8c50d6b2ffdc1ae91ee30e2704b47896aa325b42b58a2fcf65b","revision":0},{"source":"hackage","package":"hashable","version":"1.3.1.0","flags":["+integer-gmp"],"cabal_sha256":"d965e098e06cc585b201da6137dcb31c40f35eb7a937b833903969447985c076","src_sha256":"8061823a4ac521b53912edcba36b956f3159cb885b07ec119af295a6568ca7c4","revision":0},{"source":"hackage","package":"heaps","version":"0.4","flags":[],"cabal_sha256":"66b19fcd813b0e4db3e0bac541bd46606c3b13d3d081d9f9666f4be0f5ff14b8","src_sha256":"89329df8b95ae99ef272e41e7a2d0fe2f1bb7eacfcc34bc01664414b33067cfd","revision":0},{"source":"hackage","package":"js-dgtable","version":"0.5.2","flags":[],"cabal_sha256":"f75cb4fa53c88c65794becdd48eb0d3b2b8abd89a3d5c19e87af91f5225c15e4","src_sha256":"e28dd65bee8083b17210134e22e01c6349dc33c3b7bd17705973cd014e9f20ac","revision":0},{"source":"hackage","package":"js-flot","version":"0.8.3","flags":[],"cabal_sha256":"4c1c447a9a2fba0adba6d30678302a30c32b9dfde9e7aa9e9156483e1545096d","src_sha256":"1ba2f2a6b8d85da76c41f526c98903cbb107f8642e506c072c1e7e3c20fe5e7a","revision":0},{"source":"hackage","package":"js-jquery","version":"3.3.1","flags":[],"cabal_sha256":"59ab6c79159549ef94b584abce8e6d3b336014c2cce1337b59a8f637e2856df5","src_sha256":"e0e0681f0da1130ede4e03a051630ea439c458cb97216cdb01771ebdbe44069b","revision":0},{"source":"hackage","package":"primitive","version":"0.7.1.0","flags":[],"cabal_sha256":"29de6bfd0cf8ba023ceb806203dfbec0e51e3524e75ffe41056f70b4229c6f0f","src_sha256":"6bebecfdf2a57787d9fd5231bfd612b65a92edd7b33a973b2a0f11312b89a3f0","revision":3},{"source":"hackage","package":"unordered-containers","version":"0.2.13.0","flags":["-debug"],"cabal_sha256":"6310c636f92ed4908fdd0de582b6be31c2851c7b5f2ec14e9f416eb94df7a078","src_sha256":"86b01369ab8eb311383a052d389337e2cd71a63088323f02932754df4aa37b55","revision":0},{"source":"hackage","package":"utf8-string","version":"1.0.2","flags":[],"cabal_sha256":"79416292186feeaf1f60e49ac5a1ffae9bf1b120e040a74bf0e81ca7f1d31d3f","src_sha256":"ee48deada7600370728c4156cb002441de770d0121ae33a68139a9ed9c19b09a","revision":0},{"source":"hackage","package":"shake","version":"0.19.4","flags":["-cloud","-embed-files","-portable"],"cabal_sha256":"be81f7c69137e639812380047dfbbdd253ca536cc919504c3bc0f14517e80eb9","src_sha256":"5bae8873f628113604159f650802edb249dfbe5802c4612751f680ac987d73ee","revision":0},{"source":"local","package":"hadrian","version":"0.1.0.0","flags":["+threaded"],"cabal_sha256":null,"src_sha256":null,"revision":null}],"builtin":[{"package":"rts","version":"1.0"},{"package":"ghc-prim","version":"0.7.0"},{"package":"ghc-bignum","version":"1.0"},{"package":"base","version":"4.15.0.0"},{"package":"array","version":"0.5.4.0"},{"package":"deepseq","version":"1.4.5.0"},{"package":"bytestring","version":"0.10.12.1"},{"package":"containers","version":"0.6.4.1"},{"package":"binary","version":"0.8.8.0"},{"package":"filepath","version":"1.4.2.1"},{"package":"time","version":"1.9.3"},{"package":"unix","version":"2.7.2.2"},{"package":"directory","version":"1.3.6.1"},{"package":"transformers","version":"0.5.6.2"},{"package":"mtl","version":"2.2.2"},{"package":"ghc-boot-th","version":"9.0.1"},{"package":"pretty","version":"1.1.3.6"},{"package":"template-haskell","version":"2.17.0.0"},{"package":"text","version":"1.2.4.1"},{"package":"parsec","version":"3.1.14.0"},{"package":"process","version":"1.6.11.0"},{"package":"Cabal","version":"3.4.0.0"}]}
\ No newline at end of file
diff --git a/hadrian/bootstrap/src/Main.hs b/hadrian/bootstrap/src/Main.hs
new file mode 100644
index 0000000000..c87383d7de
--- /dev/null
+++ b/hadrian/bootstrap/src/Main.hs
@@ -0,0 +1,233 @@
+module Main (main) where
+
+import Control.Monad      (when)
+import Data.Either        (partitionEithers)
+import Data.Foldable      (for_, traverse_)
+import Data.Maybe         (listToMaybe)
+import Data.String        (fromString)
+import Data.Traversable   (for)
+import System.Environment (getArgs)
+import System.Exit        (exitFailure)
+import System.IO          (hPutStrLn, stderr)
+
+import qualified Data.Text as T
+import qualified Cabal.Index                    as I
+import qualified Cabal.Plan                     as P
+import qualified Data.Aeson                     as A
+import qualified Data.ByteString.Lazy           as LBS
+import qualified Data.Map.Strict                as Map
+import qualified Data.Set                       as Set
+import qualified Distribution.Types.PackageName as C
+import qualified Distribution.Types.Version as C
+import qualified Topograph                      as TG
+
+-------------------------------------------------------------------------------
+-- Main
+-------------------------------------------------------------------------------
+
+main :: IO ()
+main = do
+    args <- getArgs
+    case args of
+        [fp] -> main1 fp
+        _    -> die "Usage: hadrian-bootstrap-gen plan.json"
+
+main1 :: FilePath -> IO ()
+main1 planPath = do
+    meta <- I.cachedHackageMetadata
+    plan <- P.decodePlanJson planPath
+    main2 meta plan
+
+main2 :: Map.Map C.PackageName I.PackageInfo -> P.PlanJson -> IO ()
+main2 meta plan = do
+    info $ show $ Map.keys $ P.pjUnits plan
+
+    -- find hadrian-install:exe:hadrian unit
+    (hadrianUid, hadrianUnit) <- case findHadrianExe plan of
+        Just x  -> return x
+        Nothing -> die "Cannot find hadrian:exe unit"
+
+    info $ "hadrian:exe unit " ++ show hadrianUid
+
+    -- BFS from hadrian unit, getting all dependencies
+    units <- bfs plan hadrianUnit
+
+    info $ "Unit order:"
+    for_ units $ \unit -> do
+        info $ " - " ++ show (P.uId unit)
+
+    (builtin, deps) <- fmap partitionEithers $ for units $ \unit -> do
+        let P.PkgId pkgname@(P.PkgName tpkgname) ver@(P.Ver verdigits) = P.uPId unit
+
+        let uid = P.uId unit
+
+        let cpkgname :: C.PackageName
+            cpkgname = C.mkPackageName (T.unpack tpkgname)
+
+        let cversion :: C.Version
+            cversion = C.mkVersion verdigits
+
+        case P.uType unit of
+            P.UnitTypeBuiltin ->
+                return $ Left Builtin
+                  { builtinPackageName = pkgname
+                  , builtinVersion     = ver
+                  }
+
+            _ -> do
+                (src, rev, revhash) <- case P.uSha256 unit of
+                    Just _  -> do
+                        pkgInfo <- maybe (die $ "Cannot find " ++ show uid ++ " package metadata") return $
+                            Map.lookup cpkgname meta
+                        relInfo <- maybe (die $ "Cannot find " ++ show uid ++ " version metadata") return $
+                            Map.lookup cversion $ I.piVersions pkgInfo
+
+                        return
+                            ( Hackage
+                            , Just $ fromIntegral (I.riRevision relInfo)
+                            , P.sha256FromByteString $ I.getSHA256 $ I.riCabal relInfo
+                            )
+
+                    Nothing -> case P.uType unit of
+                        P.UnitTypeLocal   -> return (Local, Nothing, Nothing)
+                        t                 -> die $ "Unit of wrong type " ++ show uid ++ " " ++ show t
+
+                return $ Right Dep
+                    { depPackageName = pkgname
+                    , depVersion     = ver
+                    , depSource      = src
+                    , depSrcHash     = P.uSha256 unit
+                    , depRevision    = rev
+                    , depRevHash     = revhash
+                    , depFlags       =
+                        [ (if fval then "+" else "-") ++ T.unpack fname
+                        | (P.FlagName fname, fval) <- Map.toList (P.uFlags unit)
+                        ]
+                    }
+
+    LBS.putStr $ A.encode Result
+        { resBuiltin      = builtin
+        , resDependencies = deps
+        }
+
+bfs :: P.PlanJson -> P.Unit -> IO [P.Unit]
+bfs plan unit0 = do
+    uids <- either (\loop -> die $ "Loop in install-plan " ++ show loop) id $ TG.runG am $ \g -> do
+        v <- maybe (die "Cannot find hadrian-install unit in topograph") return $
+            TG.gToVertex g $ P.uId unit0
+
+        let t = TG.dfs g v
+
+        return $ map (TG.gFromVertex g) $
+            -- nub and sort
+            reverse $ Set.toList $ Set.fromList $ concat t
+
+    for uids $ \uid -> do
+        unit <- lookupUnit units uid
+        case Map.toList (P.uComps unit) of
+            [(_, compinfo)] -> checkExeDeps uid (P.pjUnits plan) (P.ciExeDeps compinfo)
+            _               -> die $ "Unit with multiple components " ++ show uid
+        return unit
+
+  where
+    am :: Map.Map P.UnitId (Set.Set P.UnitId)
+    am = fmap (foldMap P.ciLibDeps . P.uComps) units
+
+    units = P.pjUnits plan
+
+checkExeDeps :: P.UnitId -> Map.Map P.UnitId P.Unit -> Set.Set P.UnitId -> IO ()
+checkExeDeps pkgUid units = traverse_ check . Set.toList where
+    check uid = do
+        unit <- lookupUnit units uid
+        let P.PkgId pkgname _ = P.uPId unit
+        when (pkgname /= P.PkgName (fromString "hsc2hs")) $ do
+            die $ "unit " ++ show pkgUid ++ " depends on executable " ++ show uid
+
+lookupUnit :: Map.Map P.UnitId P.Unit -> P.UnitId -> IO P.Unit
+lookupUnit units uid
+    = maybe (die $ "Cannot find unit " ++ show uid) return
+    $ Map.lookup uid units
+
+-------------------------------------------------------------------------------
+-- Data
+-------------------------------------------------------------------------------
+
+data Result = Result
+    { resBuiltin      :: [Builtin]
+    , resDependencies :: [Dep]
+    }
+  deriving (Show)
+
+data Builtin = Builtin
+    { builtinPackageName :: P.PkgName
+    , builtinVersion     :: P.Ver
+    }
+  deriving (Show)
+
+data Dep = Dep
+    { depPackageName :: P.PkgName
+    , depVersion     :: P.Ver
+    , depSource      :: SrcType
+    , depSrcHash     :: Maybe P.Sha256
+    , depRevision    :: Maybe Int
+    , depRevHash     :: Maybe P.Sha256
+    , depFlags       :: [String]
+    }
+  deriving (Show)
+
+data SrcType
+    = Hackage
+    | Local
+  deriving (Show)
+
+instance A.ToJSON Result where
+    toJSON res = A.object
+        [ fromString "builtin"      A..= resBuiltin res
+        , fromString "dependencies" A..= resDependencies res
+        ]
+
+instance A.ToJSON Builtin where
+    toJSON b = A.object
+        [ fromString "package"      A..= builtinPackageName b
+        , fromString "version"      A..= builtinVersion b
+        ]
+
+instance A.ToJSON Dep where
+    toJSON dep = A.object
+        [ fromString "package"      A..= depPackageName dep
+        , fromString "version"      A..= depVersion dep
+        , fromString "source"       A..= depSource dep
+        , fromString "src_sha256"   A..= depSrcHash dep
+        , fromString "revision"     A..= depRevision dep
+        , fromString "cabal_sha256" A..= depRevHash dep
+        , fromString "flags"        A..= depFlags dep
+        ]
+
+instance A.ToJSON SrcType where
+    toJSON Hackage     = fromString "hackage"
+    toJSON Local       = fromString "local"
+
+-------------------------------------------------------------------------------
+-- Utilities
+-------------------------------------------------------------------------------
+
+info :: String -> IO ()
+info msg = hPutStrLn stderr $ "INFO: " ++ msg
+
+die :: String -> IO a
+die msg = do
+    hPutStrLn stderr msg
+    exitFailure
+
+-------------------------------------------------------------------------------
+-- Pure bits
+-------------------------------------------------------------------------------
+
+findHadrianExe :: P.PlanJson -> Maybe (P.UnitId, P.Unit)
+findHadrianExe plan = listToMaybe
+    [ (uid, unit)
+    | (uid, unit) <- Map.toList (P.pjUnits plan)
+    , let P.PkgId pkgname _ = P.uPId unit
+    , pkgname == P.PkgName (fromString "hadrian")
+    , Map.keys (P.uComps unit) == [P.CompNameExe (fromString "hadrian")]
+    ]