D16275.id39147.diff
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D16275.id39147.diff
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	diff --git a/src/filesystem/Filesystem.php b/src/filesystem/Filesystem.php
	--- a/src/filesystem/Filesystem.php
	+++ b/src/filesystem/Filesystem.php
	@@ -251,6 +251,32 @@


	/**
	+ * Copy a file, preserving file attributes (if relevant for the OS).
	+ *
	+ * @param string File path to copy from. This file must exist and be
	+ * readable, or an exception will be thrown.
	+ * @param string File path to copy to. If a file exists at this path
	+ * already, it wll be overwritten.
	+ *
	+ * @task file
	+ */
	+ public static function copyFile($from, $to) {
	+ $from = self::resolvePath($from);
	+ $to = self::resolvePath($to);
	+
	+ self::assertExists($from);
	+ self::assertIsFile($from);
	+ self::assertReadable($from);
	+
	+ if (phutil_is_windows()) {
	+ execx('copy /Y %s %s', $from, $to);
	+ } else {
	+ execx('cp -p %s %s', $from, $to);
	+ }
	+ }
	+
	+
	+ /**
	* Remove a file or directory.
	*
	* @param string File to a path or directory to remove.