Hi,
I wanted to add sstate cache support to my WIP meta-bbtracer layer and I
ran into a problem.
Following the manual
(https://docs.yoctoproject.org/singleindex.html#shared-state), I tried
to use sstate-plaindirs instead of separate sstate-inputdirs and
sstate-outputdirs since I don't actually need to use different
directories, but I noticed that artifacts placed in such dirs always get
deleted, and the corresponding zst archive in sstate-cache is empty. If
I use sstate-inputdirs/outputdirs, it works.
To isolate and reproduce the issue, I set up a dummy yocto layer that
just adds a class that adds a task that writes a dummy file after
do_unpack: https://github.com/alpianon/meta-sstate-test
The dummy bbclass is:
```
SSTATE_TEST_DIR = "${TMPDIR}/sstate-test/${PN}"
SSTATE_TEST_FILE = "${SSTATE_TEST_DIR}/sstate-test.json"
python do_sstatetest () {
bb.warn("writing to %s" % d.getVar("SSTATE_TEST_FILE"))
with open(d.getVar("SSTATE_TEST_FILE"), "w") as f:
f.write("Hello World!")
}
addtask do_sstatetest after do_unpack before do_patch
SSTATETASKS += "do_sstatetest"
do_sstatetest[sstate-plaindirs] = "${SSTATE_TEST_DIR}"
python do_sstatetest_setscene () {
sstate_setscene(d)
}
addtask do_sstatetest_setscene
do_sstatetest[dirs] = "${SSTATE_TEST_DIR}"
```
After running `bitbake -c sstatetest <whatever-recipe>`, a
sstate-test.json is expected to be found in
tmp/sstate-test/<whatever-recipe>, but such dir is empty instead. But if
I remove the whole sstate configuration from the above bbclass, the file
is there after running the task.
By adding some debug messages to sstate.bbclass, I concluded that the
sstate "plaindir" content gets deleted by prepdir() function called
within this code in sstate.bbclass:
https://git.yoctoproject.org/poky/tree/meta/classes-global/sstate.bbclass#n385
but I don't understand why.
Is that the intended behaviour? Am I missing something?
Thanks
Cheers,
Alberto
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