How to change the soft link in target.requires or target.wants directory

[CS20 CHLi30]

Hi Felix,

If you need to add your .service unit file into .want or .requires folder, you can use systemd to do that in .bb file.

You can refer obmc-op-control-power_git.bb this file for example:

Install to .requires folder:
RESET_ON_TMPL = "op-reset-chassis-running at .service"
RESET_ON_INSTFMT = "op-reset-chassis-running@{0}.service"
RESET_ON_FMT = "../${RESET_ON_TMPL}:${RESET_TGTFMT}.requires/${RESET_ON_INSTFMT}"

Install to .want folder:
# Force the standby target to run the chassis reset check target
RESET_TMPL_CTRL = "obmc-chassis-powerreset at .target"
SYSD_TGT = "multi-user.target"
RESET_INSTFMT_CTRL = "obmc-chassis-powerreset@{0}.target"
RESET_FMT_CTRL = "../${RESET_TMPL_CTRL}:${SYSD_TGT}.wants/${RESET_INSTFMT_CTRL}"
SYSTEMD_LINK_${PN} += "${@compose_list_zip(d, 'RESET_FMT_CTRL', 'OBMC_CHASSIS_INSTANCES')}"

Sincerely,
Tim
-----Original Message-----
From: openbmc [mailto:openbmc-bounces+chli30=nuvoton.com at lists.ozlabs.org] On Behalf Of Lei YU
Sent: Thursday, December 26, 2019 3:37 PM
To: zhang_cy1989 <zhang_cy1989 at 163.com>
Cc: openbmc at lists.ozlabs.org
Subject: Re: How to change the soft link in target.requires or target.wants directory

On Thu, Dec 26, 2019 at 3:18 PM zhang_cy1989 <zhang_cy1989 at 163.com> wrote:
>
> Dear All
>    The target.requires or target.wants contains some soft link.
>    Ex:
>         /lib/systemd/system/obmc-host-startmin at 0.target.requires
>                    lrwxrwxrwx    1 root     root            31 Nov 29  2019 obmc-chassis-poweron at 0.target -> ../obmc-chassis-poweron at .target
>                    lrwxrwxrwx    1 root     root            25 Nov 28 09:51 op-occ-enable at 0.service -> ../op-occ-enable at .service
>                    lrwxrwxrwx    1 root     root            22 Nov 28 09:57 start_host at 0.service -> ../start_host at .service
>
>     Now, I want to add or delete soft link:op-occ-enable at 0.service
>     I can use "rm -rf ./op-occ-enable at 0.service" to achieve the goal.
>     But,I'm not exactly sure this is formal operation. And I'm afraid this will be side effect.
>
>     Are there other tools or formal methods to do this?

These links are expected to be managed by systemd.
You could disable or mask the services by `systemctl [disable|mask] <service>`. If you need them later, just enable or unmask them.
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