[yocto] CONFFILES journey form source dir to rootfs

[Burton, Ross]

The standard do_install (which calls make install) copies the file
from the source tree to the staging directory.

Ross
On Mon, 12 Nov 2018 at 11:52, Alan Martinovic <alan.martinovic at senic.com> wrote:
>
> Hi,
> I'm trying to understand how a conf file finds its way from source to
> the rootfs.
>
> The example is use is `journald.conf` from systemd.
> The file originates from systemd source:
>     work/cortexa7hf-neon-vfpv4-senic-linux-gnueabi/systemd/1_234-r0/git/src/journal/journald.conf
>
> In the environment is only mentioned as a part of the CONFFILES.
> [output of `bitbake systemd -e` formated for readability]:
>
>     # $CONFFILES [2 operations]
>     #   set /mnt/data/alan/work/senic-os/oe/meta/conf/documentation.conf:116
>     #     [doc] "Identifies editable or configurable files that are
> part of a package."
>     #   override[systemd]:rename from CONFFILES_${PN} data.py:116 [expandKeys]
>     #     "${sysconfdir}/machine-id
>            ${sysconfdir}/systemd/coredump.conf
>            ${sysconfdir}/systemd/journald.conf
>            ${sysconfdir}/systemd/logind.conf
>            ${sysconfdir}/systemd/system.conf
>            ${sysconfdir}/systemd/user.conf"
>     # pre-expansion value:
>     #   "None"
>     #
>     # $CONFFILES_systemd
>     #   rename from CONFFILES_${PN} data.py:116 [expandKeys]
>     #     "${sysconfdir}/machine-id
>            ${sysconfdir}/systemd/coredump.conf
>            ${sysconfdir}/systemd/journald.conf
>            ${sysconfdir}/systemd/logind.conf
>            ${sysconfdir}/systemd/system.conf
>            ${sysconfdir}/systemd/user.conf"
>     CONFFILES_systemd="/etc/machine-id
>             /etc/systemd/coredump.conf
>             /etc/systemd/journald.conf
>             /etc/systemd/logind.conf
>             /etc/systemd/system.conf
>             /etc/systemd/user.conf"
>
>
> The file successfully ends up at `/etc/systemd/journald.conf`.
>
> Why isn't there an action in the environment showing the copying of
> journald.conf
> from `...git/src/journal/journald.conf` to
> `${sysconfdir}/systemd/journald.conf`?
>
>
> Disclaimer:
> There were also some sed related actions with the file in the environment
> which I dropped to reduce noise.
>
> Be Well,
> Alan
> --
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