binman: etype: u_boot_spl_pubkey_dtb: provide more explicit error for key-name-hint with path

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 <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

1 files changed, 16 insertions, 0 deletions

diff --git a/tools/binman/test/348_key_name_hint_dir_spl_pubkey_dtb.dts b/tools/binman/test/348_key_name_hint_dir_spl_pubkey_dtb.dts
new file mode 100644
index 00000000000..85ebd58b6c0
--- /dev/null
+++ b/tools/binman/test/348_key_name_hint_dir_spl_pubkey_dtb.dts
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		u-boot-spl-pubkey-dtb {
+			algo = "sha384,rsa4096";
+			required = "conf";
+			key-name-hint = "keys/key";
+		};
+	};
+};