[PATCHv3] sstate.bbclass: Fetch non-existing local .sig files if needed

For the case of a global shared state cache and a local sstate cache
with a mix of signed and un-signed entries, there is a case where
a .sig is missing locally, but may exist in the global sstate cache.

For this case, do not just fail sstate fetch, but rather backfill
the .sig file from the global sstate cache.

If this case is detected, re-run the fetch operation to get the
global .sig file (if it exists).

Signed-off-by: Tobias Hagelborn <tobias.hagelborn@axis.com>
---
New in v3:
* Use exists
* Consolidate into previously existing fetch block (with new condition)

 meta/classes-global/sstate.bbclass | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Please backport this to Kirkstone and Langdale.

//Peter

> -----Original Message-----
> From: openembedded-core@lists.openembedded.org <openembedded-core@lists.openembedded.org> On Behalf Of Tobias Hagelborn
> Sent: den 30 januari 2023 15:20
> To: openembedded-core@lists.openembedded.org
> Subject: [OE-core] [PATCHv3] sstate.bbclass: Fetch non-existing local .sig files if needed
> 
> For the case of a global shared state cache and a local sstate cache
> with a mix of signed and un-signed entries, there is a case where
> a .sig is missing locally, but may exist in the global sstate cache.
> 
> For this case, do not just fail sstate fetch, but rather backfill
> the .sig file from the global sstate cache.
> 
> If this case is detected, re-run the fetch operation to get the
> global .sig file (if it exists).
> 
> Signed-off-by: Tobias Hagelborn <tobias.hagelborn@axis.com>
> ---
> New in v3:
> * Use exists
> * Consolidate into previously existing fetch block (with new condition)
> 
>  meta/classes-global/sstate.bbclass | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/meta/classes-global/sstate.bbclass b/meta/classes-global/sstate.bbclass
> index 77e3ea34e1..567de4aba4 100644
> --- a/meta/classes-global/sstate.bbclass
> +++ b/meta/classes-global/sstate.bbclass
> @@ -365,8 +365,9 @@ def sstate_installpkg(ss, d):
>      d.setVar("SSTATE_CURRTASK", ss['task'])
>      sstatefetch = d.getVar('SSTATE_PKGNAME')
>      sstatepkg = d.getVar('SSTATE_PKG')
> +    verify_sig = bb.utils.to_boolean(d.getVar("SSTATE_VERIFY_SIG"), False)
> 
> -    if not os.path.exists(sstatepkg):
> +    if not os.path.exists(sstatepkg) or (verify_sig and not os.path.exists(sstatepkg + '.sig')):
>          pstaging_fetch(sstatefetch, d)
> 
>      if not os.path.isfile(sstatepkg):
> @@ -377,7 +378,7 @@ def sstate_installpkg(ss, d):
> 
>      d.setVar('SSTATE_INSTDIR', sstateinst)
> 
> -    if bb.utils.to_boolean(d.getVar("SSTATE_VERIFY_SIG"), False):
> +    if verify_sig:
>          if not os.path.isfile(sstatepkg + '.sig'):
>              bb.warn("No signature file for sstate package %s, skipping acceleration..." % sstatepkg)
>              return False
> --
> 2.30.2