commit 55151b4575a39bf4f43457014e2444a24bc7866c
author David Tolnay <dtolnay@gmail.com> Tue Sep 22 01:27:30 2020 -0400
committer David Tolnay <dtolnay@gmail.com> Thu Sep 24 09:40:27 2020 -0400
tree 47e109069cdc5c3a91b26eae114e4bc0d97b92ce
parent 5f6cffad4a5cf1f17762dd8d552f1c0f9a85883c

Match bazel's semantics for genrule cmd

demo/BUCK

diff --git a/demo/BUCK b/demo/BUCK
index 78e75e6..eebe5c2 100644
--- a/demo/BUCK
+++ b/demo/BUCK
@@ -1,3 +1,5 @@
+load("//tools/buck:genrule.bzl", "genrule")
+
 rust_binary(
     name = "demo",
     srcs = glob(["src/**/*.rs"]),

tests/BUCK

diff --git a/tests/BUCK b/tests/BUCK
index a96bfb8..79ae790 100644
--- a/tests/BUCK
+++ b/tests/BUCK
@@ -1,3 +1,5 @@
+load("//tools/buck:genrule.bzl", "genrule")
+
 rust_test(
     name = "test",
     srcs = ["test.rs"],

tools/buck/genrule.bzl

diff --git a/tools/buck/genrule.bzl b/tools/buck/genrule.bzl
new file mode 100644
index 0000000..b5364b7
--- /dev/null
+++ b/tools/buck/genrule.bzl
@@ -0,0 +1,8 @@
+def genrule(cmd, **kwargs):
+    # Resolve a distracting inconsistency between Buck and Bazel.
+    # Bazel creates the directory for your output file, while Buck expects the
+    # cmd to create it.
+    #
+    # TODO: send this as a PR to Buck, because Bazel's behavior here is better.
+    cmd = "mkdir -p `dirname ${OUT}`; " + cmd
+    native.genrule(cmd = cmd, **kwargs)