From f33bf0ddece848d2b26a664b44be221123534db4 Mon Sep 17 00:00:00 2001
From: Igor Gnatenko <ignatenkobrain@fedoraproject.org>
Date: Tue, 31 Jan 2017 00:44:25 +0100
Subject: [PATCH] initial implementation of rust2rpm

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>
---
 rust2rpm.py | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 rust2rpm.py

diff --git a/rust2rpm.py b/rust2rpm.py
new file mode 100644
index 0000000..de772a0
--- /dev/null
+++ b/rust2rpm.py
@@ -0,0 +1,136 @@
+import argparse
+import itertools
+import os
+import tarfile
+import tempfile
+import subprocess
+import sys
+
+import jinja2
+import requests
+
+import cargodeps
+
+API_URL = "https://crates.io/api/v1/"
+TEMPLATE = """# Generated by rust2rpm
+%global crate {{ name }}
+
+Name:           rust-%{crate}
+Version:        {{ version }}
+Release:        1%{?dist}
+Summary:        # FIXME
+
+License:        # FIXME
+URL:            https://crates.io/crates/{{ name }}
+Source0:        https://crates.io/api/v1/crates/%{crate}/%{version}/download#/%{crate}-%{version}.crate
+
+ExclusiveArch:  %{rust_arches}
+
+BuildRequires:  rust
+BuildRequires:  cargo
+{% for br, bc in zip(buildrequires, buildconflicts) %}
+BuildRequires:  {{ br }}
+{% if bc is not none %}
+BuildConflicts: {{ bc }}
+{% endif %}
+{% endfor %}
+
+%description
+%{summary}.
+
+%package        devel
+Summary:        %{summary}
+BuildArch:      noarch
+{% for prov in provides %}
+Provides:       {{ prov }}
+{% endfor %}
+{% for req, con in zip(requires, conflicts) %}
+Requires:       {{ req }}
+{% if con is not none %}
+Conflicts:      {{ con }}
+{% endif %}
+{% endfor %}
+
+%description    devel
+%{summary}.
+
+%prep
+%autosetup -n %{crate}-%{version}
+%cargo_prep
+
+%install
+%cargo_install_crate %{crate}-%{version}
+
+%check
+%cargo_test
+
+%files devel
+%license # FIXME
+%{cargo_registry}/%{crate}-%{version}/
+
+%changelog
+"""
+JINJA_ENV = jinja2.Environment(undefined=jinja2.StrictUndefined,
+                               trim_blocks=True, lstrip_blocks=True)
+JINJA_ENV.globals.update(zip=itertools.zip_longest)
+
+
+def run_depgen(*params):
+    cmd = [sys.executable, cargodeps.__file__, *params]
+    out = subprocess.check_output(cmd, universal_newlines=True)
+    return out.split("\n")[:-1]
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-t", "--target", choices=("epel-7", "fedora-26"), required=True,
+                        help="Distribution target")
+    parser.add_argument("crate", help="crates.io name")
+    parser.add_argument("version", nargs="?", help="crates.io version")
+    args = parser.parse_args()
+
+    if args.version is None:
+        # Now we need to get latest version
+        url = requests.compat.urljoin(API_URL, "crates/{}/versions".format(args.crate))
+        req = requests.get(url)
+        req.raise_for_status()
+        args.version = req.json()["versions"][0]["num"]
+
+    cratef = "{}-{}.crate".format(args.crate, args.version)
+    if not os.path.isfile(cratef):
+        url = requests.compat.urljoin(API_URL, "crates/{}/{}/download#".format(args.crate, args.version))
+        req = requests.get(url, stream=True)
+        req.raise_for_status()
+        with open(cratef, "wb") as f:
+            # FIXME: should we use req.iter_content() and specify custom chunk size?
+            for chunk in req:
+                f.write(chunk)
+
+    files = []
+    with tempfile.TemporaryDirectory() as tmpdir:
+        target_dir = "{}/".format(tmpdir)
+        with tarfile.open(cratef, "r") as archive:
+            for n in archive.getnames():
+                if not os.path.abspath(os.path.join(target_dir, n)).startswith(target_dir):
+                    raise Exception("Unsafe filenames!")
+            archive.extractall(target_dir)
+        toml = "{}/{}-{}/Cargo.toml".format(tmpdir, args.crate, args.version)
+        assert os.path.isfile(toml)
+
+        # TODO: implement following
+        buildrequires = []
+        buildconflicts = []
+        if args.target == "fedora-26":
+            # Those are automatically added by dependency generator
+            provides = []
+            requires = []
+            conflicts = []
+        else:
+            provides = run_depgen("--provides", toml)
+            requires = run_depgen("--requires", toml)
+            conflicts = run_depgen("--conflicts", toml)
+
+    template = JINJA_ENV.from_string(TEMPLATE)
+    print(template.render(name=args.crate, version=args.version,
+                          provides=provides,
+                          buildrequires=buildrequires, buildconflicts=buildconflicts,
+                          requires=requires, conflicts=conflicts))