Bug 3975 - When B != S, set S as read-only
Summary: When B != S, set S as read-only
Status: RESOLVED WONTFIX
Alias: None
Product: OE-Core
Classification: Build System, Metadata & Runtime
Component: core (show other bugs)
Version: 1.4
Hardware: x86 Multiple
: Low enhancement
Target Milestone: Future
Assignee: Saul Wold
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Reported: 2013-03-04 12:07 UTC by Ross Burton
Modified: 2014-01-21 10:45 UTC (History)
4 users (show)

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OS type for building Yocto: ---
Type of Regression: ---
Verified:
Documentation change: Don't know

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Description Ross Burton 2013-03-04 12:07:03 UTC 
If we're doing a build where $B != $S, then after patching set $S to read-only.  The fun will be restoring read/write on errors so the directories can be erased.
Comment 1 Matthieu Crapet 2014-01-21 10:40:12 UTC 
This is quite tricky.
Adding:

<code>
check_separate_build() {
	if [ "${S}" != "${B}" ]; then
		bbnote 'Separate build: chmod a-w ${S}'
		chmod a-w ${S}
	fi
}

do_configure[prefuncs] = "check_separate_build"
</cpde>

to base.bbclass is easy, but how to revertit ? do_clean will fail because of Permissions. How to detect that do_configure failed?
Comment 2 Ross Burton 2014-01-21 10:45:01 UTC 
To be honest I'm not sure if this is even possible, making the assumption that *nothing* in the build will touch $S is tough.  As the creater of this bug let's say I was over-enthusiastic and close it.