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docs: Set LIBC=gnu for s390x too

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The Developer Guide instructs to install the agent from
`${ARCH}-unknown-linux-${LIBC}`, where `$LIBC` is set to `gnu` for
ppc64le (because Rust has no musl target there). The same is true for
s390x. Also set this for s390x.

Fixes: #2092

Signed-off-by: Jakob Naucke <jakob.naucke@ibm.com>
This commit is contained in:
Jakob Naucke 2021-06-23 16:55:50 +02:00
parent 951bb6a78f
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docs/Developer-Guide.md
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@ -354,10 +354,11 @@ You MUST choose one of `alpine`, `centos`, `clearlinux`, `euleros`, and `fedora`
>
> - Check the [compatibility matrix](../tools/osbuilder/README.md#platform-distro-compatibility-matrix) before creating rootfs.
Optionally, add your custom agent binary to the rootfs with the following, `LIBC` default is `musl`, if `ARCH` is `ppc64le`, should set the `LIBC=gnu` and `ARCH=powerpc64le`:
Optionally, add your custom agent binary to the rootfs with the following commands. The default `$LIBC` used
is `musl`, but on ppc64le and s390x, `gnu` should be used. Also, Rust refers to ppc64le as `powerpc64le`:
```
$ export ARCH=$(uname -m)
$ [ ${ARCH} == "ppc64le" ] && export LIBC=gnu || export LIBC=musl
$ [ ${ARCH} == "ppc64le" ] || [ ${ARCH} == "s390x" ] && export LIBC=gnu || export LIBC=musl
$ [ ${ARCH} == "ppc64le" ] && export ARCH=powerpc64le
$ sudo install -o root -g root -m 0550 -T ../../../src/agent/target/${ARCH}-unknown-linux-${LIBC}/release/kata-agent ${ROOTFS_DIR}/sbin/init
```