sstate: Switch to ZStandard compressor support

This patch switches the compressor from Gzip to ZStandard for ssate cache
files.

Zstandard compression provides a significant improvement in
decompression speed as well as improvement in compression speed and disk
usage over the 'tgz' format in use.  Furthermore, its configurable
compression level offers a trade-off between time spent compressing
sstate cache files and disk space used by those files.  The reduced disk
usage also contributes to saving network traffic for those sharing their
sstate cache with others.

Zstandard should therefore be a good choice when:
* disk space is at a premium
* network speed / resources are limited
* the CI server can sstate packages can be created at high compression
* less CPU on the build server should be used for sstate decompression

(From OE-Core rev: 0710e98f40ec7394567ede1f88f7c7bae306b925)

Signed-off-by: Henry Kleynhans <hkleynhans@fb.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/meta/lib/oeqa/selftest/cases/signing.py b/meta/lib/oeqa/selftest/cases/signing.py
index af7a0b8b45..6f3d4aeae9 100644
--- a/meta/lib/oeqa/selftest/cases/signing.py
+++ b/meta/lib/oeqa/selftest/cases/signing.py
@@ -159,13 +159,13 @@ class Signing(OESelftestTestCase):
             bitbake('-c clean %s' % test_recipe)
             bitbake('-c populate_lic %s' % test_recipe)
 
-            recipe_sig = glob.glob(sstatedir + '/*/*/*:ed:*_populate_lic.tgz.sig')
-            recipe_tgz = glob.glob(sstatedir + '/*/*/*:ed:*_populate_lic.tgz')
+            recipe_sig = glob.glob(sstatedir + '/*/*/*:ed:*_populate_lic.tar.zst.sig')
+            recipe_archive = glob.glob(sstatedir + '/*/*/*:ed:*_populate_lic.tar.zst')
 
             self.assertEqual(len(recipe_sig), 1, 'Failed to find .sig file.')
-            self.assertEqual(len(recipe_tgz), 1, 'Failed to find .tgz file.')
+            self.assertEqual(len(recipe_archive), 1, 'Failed to find .tar.zst file.')
 
-            ret = runCmd('gpg --homedir %s --verify %s %s' % (self.gpg_dir, recipe_sig[0], recipe_tgz[0]))
+            ret = runCmd('gpg --homedir %s --verify %s %s' % (self.gpg_dir, recipe_sig[0], recipe_archive[0]))
             # gpg: Signature made Thu 22 Oct 2015 01:45:09 PM EEST using RSA key ID 61EEFB30
             # gpg: Good signature from "testuser (nocomment) <testuser@email.com>"
             self.assertIn('gpg: Good signature from', ret.output, 'Package signed incorrectly.')