google · Databean · Jul 20, 2026 · Jul 17, 2026
diff --git a/base/cvd/cuttlefish/common/libs/utils/BUILD.bazel b/base/cvd/cuttlefish/common/libs/utils/BUILD.bazel
@@ -122,6 +122,7 @@ cf_cc_library(
         "//cuttlefish/common/libs/utils:contains",
         "//cuttlefish/common/libs/utils:in_sandbox",
         "//cuttlefish/common/libs/utils:users",
+        "//cuttlefish/files:copy",
         "//cuttlefish/posix:rename",
         "//cuttlefish/posix:strerror",
         "//cuttlefish/posix:symlink",

diff --git a/base/cvd/cuttlefish/common/libs/utils/files.cpp b/base/cvd/cuttlefish/common/libs/utils/files.cpp
@@ -61,6 +61,7 @@
 #include "cuttlefish/common/libs/utils/environment.h"
 #include "cuttlefish/common/libs/utils/in_sandbox.h"
 #include "cuttlefish/common/libs/utils/users.h"
+#include "cuttlefish/files/copy.h"
 #include "cuttlefish/posix/rename.h"
 #include "cuttlefish/posix/strerror.h"
 #include "cuttlefish/result/result.h"
@@ -297,62 +298,6 @@ Result<bool> IsDirectoryEmpty(const std::string& path) {
   return true;
 }
 
-bool Copy(const std::string& from, const std::string& to) {
-  SharedFD fd_from = SharedFD::Open(from, O_RDONLY);
-  SharedFD fd_to = SharedFD::Open(to, O_WRONLY | O_CREAT | O_TRUNC, 0644);
-
-  if (!fd_from->IsOpen() || !fd_to->IsOpen()) {
-    return false;
-  }
-
-  off_t farthest_seek = fd_from->LSeek(0, SEEK_END);
-  if (farthest_seek == -1) {
-    LOG(ERROR) << "Could not lseek in \"" << from
-               << "\": " << fd_from->StrError();
-    return false;
-  }
-  if (fd_to->Truncate(farthest_seek) < 0) {
-    LOG(ERROR) << "Failed to truncate " << to << ": " << fd_to->StrError();
-  }
-  off_t offset = 0;
-  while (offset < farthest_seek) {
-    off_t new_offset = fd_from->LSeek(offset, SEEK_HOLE);
-    if (new_offset == -1) {
-      if (fd_from->GetErrno() == ENXIO) {
-        return true;
-      }
-      LOG(ERROR) << "Could not lseek in \"" << from
-                 << "\": " << fd_from->StrError();
-      return false;
-    }
-    auto data_bytes = new_offset - offset;
-    if (fd_to->LSeek(offset, SEEK_SET) < 0) {
-      LOG(ERROR) << "lseek() on " << to << " failed: " << fd_to->StrError();
-      return false;
-    }
-    if (!fd_to->SendFile(*fd_from, &offset, data_bytes)) {
-      LOG(ERROR) << "SendFile failed: " << fd_to->StrError();
-      return false;
-    }
-    CHECK_EQ(offset, new_offset);
-
-    if (offset >= farthest_seek) {
-      return true;
-    }
-    new_offset = fd_from->LSeek(offset, SEEK_DATA);
-    if (new_offset == -1) {
-      if (fd_from->GetErrno() == ENXIO) {
-        return true;
-      }
-      LOG(ERROR) << "Could not lseek in \"" << from
-                 << "\": " << fd_from->StrError();
-      return false;
-    }
-    offset = new_offset;
-  }
-  return true;
-}
-
 std::string AbsolutePath(std::string_view path) {
   if (path.empty()) {
     return {};

diff --git a/base/cvd/cuttlefish/common/libs/utils/files.h b/base/cvd/cuttlefish/common/libs/utils/files.h
@@ -65,7 +65,6 @@ Result<void> ChangeGroup(const std::string& path,
                          const std::string& group_name);
 bool CanAccess(const std::string& path, int mode);
 Result<bool> IsDirectoryEmpty(const std::string& path);
-bool Copy(const std::string& from, const std::string& to);
 off_t FileSize(const std::string& path);
 Result<void> RemoveFile(const std::string& file);
 Result<std::string> RenameFile(const std::string& current_filepath,

diff --git a/base/cvd/cuttlefish/files/BUILD.bazel b/base/cvd/cuttlefish/files/BUILD.bazel
@@ -6,6 +6,17 @@ package(
 
 cf_build_test(name = "files_build_test")
 
+cf_cc_library(
+    name = "copy",
+    srcs = ["copy.cc"],
+    hdrs = ["copy.h"],
+    deps = [
+        "//cuttlefish/common/libs/fs",
+        "@abseil-cpp//absl/log",
+        "@abseil-cpp//absl/log:check",
+    ],
+)
+
 cf_cc_library(
     name = "recursively_remove_directory",
     srcs = ["recursively_remove_directory.cc"],

diff --git a/base/cvd/cuttlefish/files/copy.cc b/base/cvd/cuttlefish/files/copy.cc
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#include "cuttlefish/files/copy.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+#include <string>
+
+#include "absl/log/check.h"
+#include "absl/log/log.h"
+
+#include "cuttlefish/common/libs/fs/shared_fd.h"
+
+namespace cuttlefish {
+
+bool Copy(const std::string& from, const std::string& to) {
+  SharedFD fd_from = SharedFD::Open(from, O_RDONLY);
+  SharedFD fd_to = SharedFD::Open(to, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+
+  if (!fd_from->IsOpen() || !fd_to->IsOpen()) {
+    return false;
+  }
+
+  off_t farthest_seek = fd_from->LSeek(0, SEEK_END);
+  if (farthest_seek == -1) {
+    LOG(ERROR) << "Could not lseek in \"" << from
+               << "\": " << fd_from->StrError();
+    return false;
+  }
+  if (fd_to->Truncate(farthest_seek) < 0) {
+    LOG(ERROR) << "Failed to truncate " << to << ": " << fd_to->StrError();
+  }
+  off_t offset = 0;
+  while (offset < farthest_seek) {
+    off_t new_offset = fd_from->LSeek(offset, SEEK_HOLE);
+    if (new_offset == -1) {
+      if (fd_from->GetErrno() == ENXIO) {
+        return true;
+      }
+      LOG(ERROR) << "Could not lseek in \"" << from
+                 << "\": " << fd_from->StrError();
+      return false;
+    }
+    auto data_bytes = new_offset - offset;
+    if (fd_to->LSeek(offset, SEEK_SET) < 0) {
+      LOG(ERROR) << "lseek() on " << to << " failed: " << fd_to->StrError();
+      return false;
+    }
+    if (!fd_to->SendFile(*fd_from, &offset, data_bytes)) {
+      LOG(ERROR) << "SendFile failed: " << fd_to->StrError();
+      return false;
+    }
+    CHECK_EQ(offset, new_offset);
+
+    if (offset >= farthest_seek) {
+      return true;
+    }
+    new_offset = fd_from->LSeek(offset, SEEK_DATA);
+    if (new_offset == -1) {
+      if (fd_from->GetErrno() == ENXIO) {
+        return true;
+      }
+      LOG(ERROR) << "Could not lseek in \"" << from
+                 << "\": " << fd_from->StrError();
+      return false;
+    }
+    offset = new_offset;
+  }
+  return true;
+}
+
+}  // namespace cuttlefish
diff --git a/base/cvd/cuttlefish/files/copy.h b/base/cvd/cuttlefish/files/copy.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include <string>
+
+namespace cuttlefish {
+
+bool Copy(const std::string& from, const std::string& to);
+
+}  // namespace cuttlefish
diff --git a/base/cvd/cuttlefish/host/commands/assemble_cvd/disk/BUILD.bazel b/base/cvd/cuttlefish/host/commands/assemble_cvd/disk/BUILD.bazel
@@ -135,6 +135,7 @@ cf_cc_library(
     hdrs = ["gem5_image_unpacker.h"],
     deps = [
         "//cuttlefish/common/libs/utils:files",
+        "//cuttlefish/files:copy",
         "//cuttlefish/host/commands/assemble_cvd:boot_image_utils",
         "//cuttlefish/host/commands/assemble_cvd/flags:boot_image",
         "//cuttlefish/host/libs/config:cuttlefish_config",
@@ -235,6 +236,7 @@ cf_cc_library(
     hdrs = ["kernel_ramdisk_repacker.h"],
     deps = [
         "//cuttlefish/common/libs/utils:files",
+        "//cuttlefish/files:copy",
         "//cuttlefish/host/commands/assemble_cvd:boot_image_utils",
         "//cuttlefish/host/commands/assemble_cvd:vendor_dlkm_utils",
         "//cuttlefish/host/commands/assemble_cvd/disk:image_file",

diff --git a/base/cvd/cuttlefish/host/commands/assemble_cvd/disk/gem5_image_unpacker.cpp b/base/cvd/cuttlefish/host/commands/assemble_cvd/disk/gem5_image_unpacker.cpp
@@ -20,6 +20,7 @@
 #include "android-base/file.h"
 
 #include "cuttlefish/common/libs/utils/files.h"
+#include "cuttlefish/files/copy.h"
 #include "cuttlefish/host/commands/assemble_cvd/boot_image_utils.h"
 #include "cuttlefish/host/commands/assemble_cvd/flags/boot_image.h"
 #include "cuttlefish/host/libs/config/cuttlefish_config.h"

diff --git a/base/cvd/cuttlefish/host/commands/assemble_cvd/disk/kernel_ramdisk_repacker.cpp b/base/cvd/cuttlefish/host/commands/assemble_cvd/disk/kernel_ramdisk_repacker.cpp
@@ -21,6 +21,7 @@
 #include "absl/log/log.h"
 
 #include "cuttlefish/common/libs/utils/files.h"
+#include "cuttlefish/files/copy.h"
 #include "cuttlefish/host/commands/assemble_cvd/boot_image_utils.h"
 #include "cuttlefish/host/commands/assemble_cvd/flags/boot_image.h"
 #include "cuttlefish/host/commands/assemble_cvd/vendor_dlkm_utils.h"

diff --git a/base/cvd/cuttlefish/host/commands/cvd/cli/BUILD.bazel b/base/cvd/cuttlefish/host/commands/cvd/cli/BUILD.bazel
@@ -121,6 +121,7 @@ cf_cc_library(
         "//cuttlefish/common/libs/utils:environment",
         "//cuttlefish/common/libs/utils:files",
         "//cuttlefish/common/libs/utils:users",
+        "//cuttlefish/files:copy",
         "//cuttlefish/files:recursively_remove_directory",
         "//cuttlefish/flag_parser",
         "//cuttlefish/host/commands/cvd/cli:command_request",

diff --git a/base/cvd/cuttlefish/host/commands/cvd/cli/commands/create.cpp b/base/cvd/cuttlefish/host/commands/cvd/cli/commands/create.cpp
@@ -43,6 +43,7 @@
 #include "cuttlefish/common/libs/utils/environment.h"
 #include "cuttlefish/common/libs/utils/files.h"
 #include "cuttlefish/common/libs/utils/users.h"
+#include "cuttlefish/files/copy.h"
 #include "cuttlefish/files/recursively_remove_directory.h"
 #include "cuttlefish/flag_parser/flag.h"
 #include "cuttlefish/flag_parser/gflags_compat.h"

diff --git a/base/cvd/cuttlefish/host/commands/cvd/fetch/BUILD.bazel b/base/cvd/cuttlefish/host/commands/cvd/fetch/BUILD.bazel
@@ -180,6 +180,7 @@ cf_cc_library(
     deps = [
         "//cuttlefish/common/libs/utils:archive",
         "//cuttlefish/common/libs/utils:files",
+        "//cuttlefish/files:copy",
         "//cuttlefish/host/commands/cvd/fetch:builds",
         "//cuttlefish/host/commands/cvd/fetch:de_android_sparse",
         "//cuttlefish/host/commands/cvd/fetch:fetch_tracer",

diff --git a/base/cvd/cuttlefish/host/commands/cvd/fetch/fetch_context.cc b/base/cvd/cuttlefish/host/commands/cvd/fetch/fetch_context.cc
@@ -31,6 +31,7 @@
 #include "fmt/ranges.h"
 
 #include "cuttlefish/common/libs/utils/files.h"
+#include "cuttlefish/files/copy.h"
 #include "cuttlefish/host/commands/cvd/fetch/builds.h"
 #include "cuttlefish/host/commands/cvd/fetch/de_android_sparse.h"
 #include "cuttlefish/host/commands/cvd/fetch/fetch_tracer.h"

diff --git a/base/cvd/cuttlefish/host/libs/command_util/BUILD.bazel b/base/cvd/cuttlefish/host/libs/command_util/BUILD.bazel
@@ -35,6 +35,7 @@ cf_cc_library(
         "//cuttlefish/common/libs/utils:environment",
         "//cuttlefish/common/libs/utils:files",
         "//cuttlefish/common/libs/utils:json",
+        "//cuttlefish/files:copy",
         "//cuttlefish/host/libs/config:config_instance_derived",
         "//cuttlefish/host/libs/config:cuttlefish_config",
         "//cuttlefish/posix:readlink",

diff --git a/base/cvd/cuttlefish/host/libs/command_util/snapshot_utils.cc b/base/cvd/cuttlefish/host/libs/command_util/snapshot_utils.cc
@@ -32,6 +32,7 @@
 #include "cuttlefish/common/libs/utils/environment.h"
 #include "cuttlefish/common/libs/utils/files.h"
 #include "cuttlefish/common/libs/utils/json.h"
+#include "cuttlefish/files/copy.h"
 #include "cuttlefish/posix/readlink.h"
 #include "cuttlefish/posix/symlink.h"
 #include "cuttlefish/result/result.h"

diff --git a/base/cvd/cuttlefish/host/libs/config/BUILD.bazel b/base/cvd/cuttlefish/host/libs/config/BUILD.bazel
@@ -155,6 +155,7 @@ cf_cc_library(
         "//cuttlefish/common/libs/fs",
         "//cuttlefish/common/libs/utils:files",
         "//cuttlefish/common/libs/utils:host_info",
+        "//cuttlefish/files:copy",
         "//cuttlefish/host/libs/config:ap_boot_flow",
         "//cuttlefish/host/libs/config:boot_flow",
         "//cuttlefish/host/libs/config:config_utils",

diff --git a/base/cvd/cuttlefish/host/libs/config/data_image.cpp b/base/cvd/cuttlefish/host/libs/config/data_image.cpp
@@ -30,6 +30,7 @@
 #include "cuttlefish/common/libs/fs/shared_fd.h"
 #include "cuttlefish/common/libs/utils/files.h"
 #include "cuttlefish/common/libs/utils/host_info.h"
+#include "cuttlefish/files/copy.h"
 #include "cuttlefish/host/libs/config/ap_boot_flow.h"
 #include "cuttlefish/host/libs/config/boot_flow.h"
 #include "cuttlefish/host/libs/config/config_utils.h"