[yocto] Rocko: how to remove python3 from target's rootfs

[Bejar-Colonia, Carlos]

Looks like the dhcp dependency is explicit: dhcp->bind->python3
recipes-connectivity/dhcp/dhcp.inc
	DEPENDS = "openssl bind"
recipes-connectivity/bind/bind_9.10.5-P3.bb
	RDEPENDS_${PN} = "python3-core"

In the build area: dhcp/4.3.6-r0/packages-split/dhcp-client.shlibdeps
	dhcp-libs (>= 4.3.6)
	bind (>= 9.10.5-P3)
	glibc (>= 2.26)

Does it mean that python3 cannot be removed from target rootfs?

On the other hand, I see this file in rootfs: /usr/sbin/dnssec-checkds, which requires python3 (#! /usr/bin/python3).
I believe this file gets installed from bind_9.10.5-P3.bb

do_install_append() {
        sed -i -e '1s,#!.*python3,#! /usr/bin/python3,' ${D}${sbindir}/dnssec-coverage ${D}${sbindir}/dnssec-checkds
}

How can I move this file to a different package?

Thanks,
Carlos

-----Original Message-----
From: Khem Raj <raj.khem at gmail.com> 
Sent: Friday, June 22, 2018 11:33 AM
To: Bejar-Colonia, Carlos <carlos.bejar-colonia at philips.com>
Cc: Yocto Project <yocto at yoctoproject.org>
Subject: Re: [yocto] Rocko: how to remove python3 from target's rootfs

On Fri, Jun 22, 2018 at 8:17 AM Bejar-Colonia, Carlos <carlos.bejar-colonia at philips.com> wrote:
>
> Hello Yocto Team,
>
>
>
> I’ve upgraded my Yocto system from Morty to Rocko and I’ve noticed 
> that python3 gets installed in the rootfs, which I don’t want (it 
> takes a lot disk space)
>
> I’ve noticed that when I add dhcp-client package to the rootfs (CORE_IMAGE_EXTRA_INSTALL += "dhcp-client"), python3 gets installed as well.
>
> However, with Morty, python3 does not get installed in the rootfs after adding dhcp-client pakage.
>
>
>
> Probably someone has already done this, but I was not able to figure it out. I tried: IMAGE_INSTALL_remove += "python3-core", didn’t help.
>
> Any hints on how to remove python3 from the target’s rootfs (without removing dhcp-client)?

when there are scripts in packages which requires a certain kind of interpreter e.g. perl. python. bash, sh etc. system can autodetect that if interpreter is specified in first line of script and add the appropriate runtime dependency, since this script otherwise will be useless on target.

I suspect build for dhcp is adding such a file into dhcp-client package which might be resulting in this implicit dep.

So please check it in the build area for dhcp especially under packages-split/dhcp-client

for any such scripts.

if there are any and you find that these scripts are not required for normal functioning of dhcp-client on target then move this script out into another package where it might be more appropriate, that can eliminate this rdep
>
>
>
> Thanks,
>
> Carlos
>
>
>
>
>
>
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