[PATCH 2/2] binman: etype: u_boot_spl_pubkey_dtb: provide more explicit error for key-name-hint with path

[Quentin Schulz]

From: Quentin Schulz <quentin.schulz at cherry.de>

key-name-hint property in u-boot-spl-pubkey-dtb binman entry may contain
a path instead of a filename due to user mistake.

Because we currently assume it is a filename instead of a path, binman
will find the full path to the key based on that path, and return the
dirname of the full path but keeps the path in key-name-hint instead of
stripping the directories from it.

This means mkimage will fail with the following error message if we have
key-name-hint set to keys/dev:

binman: Error 1 running 'fdt_add_pubkey -a sha256,rsa2048 -k /home/qschulz/work/upstream/u-boot/keys -n keys/dev -r conf /home/qschulz/work/upstream/u-boot/build/ringneck/u-boot-spl-dtbdhsfx3mf': Couldn't open RSA certificate: '/home/qschulz/work/upstream/u-boot/keys/keys/dev.crt': No such file or directory

Let's make it a bit more obvious what the error is by erroring out in
binman if a path is provided in key-name-hint (it is named key-name-hint
and not key-path-hint after all).

Fixes: 5609843b57a4 ("binman: etype: Add u-boot-spl-pubkey-dtb etype")
Signed-off-by: Quentin Schulz <quentin.schulz at cherry.de>
---
 tools/binman/etype/u_boot_spl_pubkey_dtb.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/binman/etype/u_boot_spl_pubkey_dtb.py b/tools/binman/etype/u_boot_spl_pubkey_dtb.py
index cb196061de28610eb785fb44c887982e3979659f..70c74b7638228f8093b85b144c6407dc92875be5 100644
--- a/tools/binman/etype/u_boot_spl_pubkey_dtb.py
+++ b/tools/binman/etype/u_boot_spl_pubkey_dtb.py
@@ -87,6 +87,8 @@ class Entry_u_boot_spl_pubkey_dtb(Entry_blob_dtb):
                                          dir=tools.get_output_dir())\
                                               as pubkey_tdb:
             tools.write_file(pubkey_tdb.name, self.GetData())
+            if '/' in self._key_name_hint:
+                self.Raise(f"'{self._key_name_hint}' is a path and not a filename")
             keyname = tools.get_input_filename(self._key_name_hint + ".crt")
             self.fdt_add_pubkey.run(pubkey_tdb.name,
                                     os.path.dirname(keyname),

-- 
2.49.0