Add xattrs rule

Signed-off-by: Roman Mohr <[email protected]>

Author: rmohr

deps.bzl

@@ -14,10 +14,15 @@ load(
     "@bazeldnf//internal:rpmtree.bzl",
     _tar2files = "tar2files",
 )
+load(
+    "@bazeldnf//internal:xattrs.bzl",
+    _xattrs = "xattrs",
+)
 
 rpm = _rpm
 rpmtree = _rpmtree
 tar2files = _tar2files
+xattrs = _xattrs
 
 def bazeldnf_dependencies():
     _maybe(

internal/xattrs.bzl

@@ -0,0 +1,65 @@
+# Copyright 2014 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+def _xattrs_impl(ctx):
+    out = ctx.outputs.out
+    args = ["xattr", "-i", ctx.files.tar[0].path, "-o", out.path]
+
+    if ctx.attr.capabilities:
+        capabilities = []
+        for k, v in ctx.attr.capabilities.items():
+            capabilities += [k + "=" + ":".join(v)]
+        args += ["--capabilities", ",".join(capabilities)]
+
+    if ctx.attr.selinux_labels:
+        selinux_labels = []
+        for k, v in ctx.attr.selinux_labels.items():
+            selinux_labels += [k + "=" + v]
+        args += ["--selinux-labels", ",".join(selinux_labels)]
+
+    ctx.actions.run(
+        inputs = ctx.files.tar,
+        outputs = [out],
+        arguments = args,
+        progress_message = "Enriching %s with xattrs" % ctx.label.name,
+        executable = ctx.executable._bazeldnf,
+    )
+
+    return [DefaultInfo(files = depset([ctx.outputs.out]))]
+
+_xattrs_attrs = {
+    "tar": attr.label(allow_single_file = True),
+    "_bazeldnf": attr.label(
+        executable = True,
+        cfg = "exec",
+        allow_files = True,
+        default = Label("//cmd:cmd"),
+    ),
+    "capabilities": attr.string_list_dict(),
+    "selinux_labels": attr.string_dict(),
+    "out": attr.output(mandatory = True),
+}
+
+_xattrs = rule(
+    implementation = _xattrs_impl,
+    attrs = _xattrs_attrs,
+)
+
+def xattrs(**kwargs):
+    basename = kwargs["name"]
+    tarname = basename + ".tar"
+    _xattrs(
+        out = tarname,
+        **kwargs
+    )