Project import generated by Copybara.

GitOrigin-RevId: 1e13be30e2c6838d4a2ff768a39c414bc80534bb

third_party/repo.bzl

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+# Copyright 2022 The MediaPipe 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.
+
+"""Utilities for defining TensorFlow Lite Support Bazel dependencies."""
+
+_SINGLE_URL_WHITELIST = []
+
+def _is_windows(ctx):
+    return ctx.os.name.lower().find("windows") != -1
+
+def _wrap_bash_cmd(ctx, cmd):
+    if _is_windows(ctx):
+        bazel_sh = _get_env_var(ctx, "BAZEL_SH")
+        if not bazel_sh:
+            fail("BAZEL_SH environment variable is not set")
+        cmd = [bazel_sh, "-l", "-c", " ".join(["\"%s\"" % s for s in cmd])]
+    return cmd
+
+def _get_env_var(ctx, name):
+    if name in ctx.os.environ:
+        return ctx.os.environ[name]
+    else:
+        return None
+
+# Checks if we should use the system lib instead of the bundled one
+def _use_system_lib(ctx, name):
+    syslibenv = _get_env_var(ctx, "TF_SYSTEM_LIBS")
+    if syslibenv:
+        for n in syslibenv.strip().split(","):
+            if n.strip() == name:
+                return True
+    return False
+
+# Executes specified command with arguments and calls 'fail' if it exited with
+# non-zero code
+def _execute_and_check_ret_code(repo_ctx, cmd_and_args):
+    result = repo_ctx.execute(cmd_and_args, timeout = 60)
+    if result.return_code != 0:
+        fail(("Non-zero return code({1}) when executing '{0}':\n" + "Stdout: {2}\n" +
+              "Stderr: {3}").format(
+            " ".join([str(x) for x in cmd_and_args]),
+            result.return_code,
+            result.stdout,
+            result.stderr,
+        ))
+
+# Apply a patch_file to the repository root directory
+# Runs 'patch -p1' on both Windows and Unix.
+def _apply_patch(ctx, patch_file):
+    patch_command = ["patch", "-p1", "-d", ctx.path("."), "-i", ctx.path(patch_file)]
+    cmd = _wrap_bash_cmd(ctx, patch_command)
+    _execute_and_check_ret_code(ctx, cmd)
+
+def _apply_delete(ctx, paths):
+    for path in paths:
+        if path.startswith("/"):
+            fail("refusing to rm -rf path starting with '/': " + path)
+        if ".." in path:
+            fail("refusing to rm -rf path containing '..': " + path)
+    cmd = _wrap_bash_cmd(ctx, ["rm", "-rf"] + [ctx.path(path) for path in paths])
+    _execute_and_check_ret_code(ctx, cmd)
+
+def _third_party_http_archive(ctx):
+    """Downloads and creates Bazel repos for dependencies.
+
+    This is a swappable replacement for both http_archive() and
+    new_http_archive() that offers some additional features. It also helps
+    ensure best practices are followed.
+    """
+    if ("mirror.tensorflow.org" not in ctx.attr.urls[0] and
+        (len(ctx.attr.urls) < 2 and
+         ctx.attr.name not in _SINGLE_URL_WHITELIST.to_list())):
+        fail("third_party_http_archive(urls) must have redundant URLs. The " +
+             "mirror.tensorflow.org URL must be present and it must come first. " +
+             "Even if you don't have permission to mirror the file, please " +
+             "put the correctly formatted mirror URL there anyway, because " +
+             "someone will come along shortly thereafter and mirror the file.")
+
+    use_syslib = _use_system_lib(ctx, ctx.attr.name)
+
+    # Use "BUILD.bazel" to avoid conflict with third party projects that contain a
+    # file or directory called "BUILD"
+    buildfile_path = ctx.path("BUILD.bazel")
+
+    if use_syslib:
+        if ctx.attr.system_build_file == None:
+            fail("Bazel was configured with TF_SYSTEM_LIBS to use a system " +
+                 "library for %s, but no system build file for %s was configured. " +
+                 "Please add a system_build_file attribute to the repository rule" +
+                 "for %s." % (ctx.attr.name, ctx.attr.name, ctx.attr.name))
+        ctx.symlink(Label(ctx.attr.system_build_file), buildfile_path)
+
+    else:
+        ctx.download_and_extract(
+            ctx.attr.urls,
+            "",
+            ctx.attr.sha256,
+            ctx.attr.type,
+            ctx.attr.strip_prefix,
+        )
+        if ctx.attr.delete:
+            _apply_delete(ctx, ctx.attr.delete)
+        if ctx.attr.patch_file != None:
+            _apply_patch(ctx, ctx.attr.patch_file)
+        ctx.symlink(Label(ctx.attr.build_file), buildfile_path)
+
+    link_dict = {}
+    if use_syslib:
+        link_dict.update(ctx.attr.system_link_files)
+
+    for internal_src, external_dest in ctx.attr.link_files.items():
+        # if syslib and link exists in both, use the system one
+        if external_dest not in link_dict.values():
+            link_dict[internal_src] = external_dest
+
+    for internal_src, external_dest in link_dict.items():
+        ctx.symlink(Label(internal_src), ctx.path(external_dest))
+
+# For link_files, specify each dict entry as:
+# "//path/to/source:file": "localfile"
+third_party_http_archive = repository_rule(
+    attrs = {
+        "sha256": attr.string(mandatory = True),
+        "urls": attr.string_list(
+            mandatory = True,
+            allow_empty = False,
+        ),
+        "strip_prefix": attr.string(),
+        "type": attr.string(),
+        "delete": attr.string_list(),
+        "build_file": attr.string(mandatory = True),
+        "system_build_file": attr.string(mandatory = False),
+        "patch_file": attr.label(),
+        "link_files": attr.string_dict(),
+        "system_link_files": attr.string_dict(),
+    },
+    environ = [
+        "TF_SYSTEM_LIBS",
+    ],
+    implementation = _third_party_http_archive,
+)