[UNSTABLE][PATCH 2/2] UBUNTU: [Packaging] add uscan watch file with GPG verification

[Dimitri John Ledkov]

Reuse upstream released original kernel tarballs and verify GPG
signature of them against the local copy of greg's key.

This should make `uscan --download-current-version` work against
released kernels, in a reproducible manner. This should also enforce
that all our released kernels reuse the kernel.org published orig
tarball.

One caveat is that tripple integer version number is preserved (as in
6.7.0) whereas on kernel.org the tarballs are actually published as
two integers only (as in 6.7). Although I seem to recall everything in
the world breaks when one changes kernel version to not be three
numbers long.

Signed-off-by: Dimitri John Ledkov <dimitri.ledkov at canonical.com>
---
 debian/upstream/signing-key.asc | 78 +++++++++++++++++++++++++++++++++
 debian/watch                    |  3 ++
 2 files changed, 81 insertions(+)
 create mode 100644 debian/upstream/signing-key.asc
 create mode 100644 debian/watch

diff --git a/debian/upstream/signing-key.asc b/debian/upstream/signing-key.asc
new file mode 100644
index 0000000000..5e3addc4ac
--- /dev/null
+++ b/debian/upstream/signing-key.asc
@@ -0,0 +1,78 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/debian/watch b/debian/watch
new file mode 100644
index 0000000000..ac0e235e69
--- /dev/null
+++ b/debian/watch
@@ -0,0 +1,3 @@
+version=4
+opts="uversionmangle=s%$%.0%,pgpsigurlmangle=s%@ARCHIVE_EXT@$%.tar.sign%,decompress" \
+https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-@ANY_VERSION@@ARCHIVE_EXT@
-- 
2.34.1