[OE-core] [PATCH 0/3][RFC] only allowed sstate-cache objects are allowed in a build (read-only sstate-cache?)

[Hongxu Jia]

Ping

//Hongxu

On 08/06/2014 03:15 PM, Hongxu Jia wrote:
> Issue description:
>
> The issue is that the developer who demand only the "new" software
> they write is allowed to be compiled from source, they only want to
> reuse binaries from an existed sstate-cache, if the developer makes
> a change that triggers a rebuild, it should be an instant error.
>
> The purpose of this is for the sstate-cache to check if the item
> exists or not. If it doesn't the item needs to be in a whitelist
> or we need to fail.
>
> I dig into three approaches to implement, and send them to oe-core
> list to see if the community has a preference as to the approach,
> and any additional comments.
>
> In these approaches, I'm not sure we should protect the 'clean' or
> not. Since it's ok to clean the sstate-cache, as long as a mirror
> fetch will pull it back down. Any suggestion is welcomed.
>
> If you have any better ideas, please don't hesitate to share with us.
>
> Test steps:
>
> 1) For approach 1
>     INHERIT += 'sstate_readonly'
>
>     For approach 2
>     INHERIT += 'sstate_readonly_2'
>
> 2) Create a sstate cache for testing
> $ bitbake db
>
> 3) Add gzip to SSTATECACHE_WHITELIST, it enabled read-only sstate-cache,
> vim local.conf
> ...
> SSTATECACHE_WHITELIST = 'gzip'
> ...
>
> 4) Remove tmp dir and build db from sstate-cache succeed
> $ mv tmp tmp-back && bitbake db
>
> 5) tweak db's do_configure task by adding comments
> --- a/meta/recipes-support/db/db_6.0.30.bb
> +++ b/meta/recipes-support/db/db_6.0.30.bb
> @@ -27,6 +27,8 @@ LIC_FILES_CHKSUM = "file://../LICENSE;md5=1ec8b0b17cc31513fe35ab10716f8490"
> @@ -82,6 +84,7 @@ do_configure() {
>          gnu-configize --force ${S}
>          export STRIP="true"
>          oe_runconf
> +       echo "hello"
>   }
>
> 6) build db and there is a build failure
> $ bitbake db
>
> 7) clean db and there is a clean failure
> bitbake db -ccleansstate
>
> 8) Append the missing recipe's PN to SSTATECACHE_WHITELIST
> vim local.conf
> ...
> SSTATECACHE_WHITELIST = 'gzip db rpm-native gcc-runtime eglibc linux-libc-headers libgcc'
> ...
>
> 9) Build db and clean db succeed
> $ bitbake db && bitbake db -ccleansstate
>
> //Hongxu
>
> The following changes since commit 870bb8d35547b8313b3a487d7e8b914ab9470e64:
>
>    local.conf.sample.extended: fix example for EXTRA_USERS_PARAMS (2014-08-04 17:38:24 +0100)
>
> are available in the git repository at:
>
>    git://git.pokylinux.org/poky-contrib hongxu/readonly-sstatecache
>    http://git.pokylinux.org/cgit.cgi/poky-contrib/log/?h=hongxu/readonly-sstatecache
>
> Hongxu Jia (3):
>    bbclass/sstate_readonly approach 1: add prefuncs to SSTATETASKS
>    bbclass/sstate_readonly_2 approach 2: add event handler at TaskStarted
>      time
>    bbclass/sstate approach 3: add checking in the return path of
>      sstate_checkhashes
>
>   meta/classes/sstate.bbclass            | 40 ++++++++++++++++++++++++++++++++++
>   meta/classes/sstate_readonly.bbclass   | 38 ++++++++++++++++++++++++++++++++
>   meta/classes/sstate_readonly_2.bbclass | 25 +++++++++++++++++++++
>   3 files changed, 103 insertions(+)
>   create mode 100644 meta/classes/sstate_readonly.bbclass
>   create mode 100644 meta/classes/sstate_readonly_2.bbclass
>