kernelci/build.py: Add apply_patch_mbox method

Signed-off-by: Nikolay Yurin <yurinnick@meta.com>

kernelci/build.py

@@ -24,6 +24,7 @@
 import re
 import shutil
 import tarfile
+import tempfile
 import time
 import urllib.parse
 
@@ -321,6 +322,37 @@ def _download_file(url, dest_filename, chunk_size=1024):
  return False
 
 
+def apply_patch_mbox(
+ kdir,
+ mbox_url,
+ git_username="kernelci-tsc",
+ git_email="kernelci-tsc@groups.io"
+):
+ """Download patch mbox from URL and apply with 3-way merge
+
+ *kdir* is the path to a kernel source directory
+ *mbox_url* is the URL to patch mbox content
+ *git_username* is the username used to apply the patch
+ *git_email* is the email used to apply the patch
+ """
+ with tempfile.NamedTemporaryFile(prefix="kernel-patch-") as tmp_f:
+ if not _download_file(mbox_url, tmp_f.name):
+ raise FileNotFoundError(f"Error downloading patch mbox {mbox_url}")
+
+ shell_cmd("""
+set -e
+cd {kdir}
+git config user.name "{git_username}"
+git config user.email "{git_email}"
+git am --3way {mbox_file}
+""".format(
+ kdir=kdir,
+ mbox_file=tmp_f.name,
+ git_username=git_username,
+ git_email=git_email
+ ))
+
+
 def pull_tarball(kdir, url, dest_filename, retries, delete):
  if os.path.exists(kdir):
  shutil.rmtree(kdir)