On 27 September 2012 23:11, Dave Reisner <d@xxxxxxxxxxxxxx> wrote: > > On Sep 27, 2012 6:08 PM, "Dmitrijs Ledkovs" <dmitrij.ledkov@xxxxxxxxxxxx> > wrote: >> >> On 27 September 2012 15:41, Dave Reisner <dreisner@xxxxxxxxxxxxx> wrote: >> > Key off of the existance of /etc/initrd-release as an indicator that >> > mdadm is running in early userspace and set the __offroot flag. This >> > allows the same udev-based assembly rules to be valid both off and on >> > root and, moreover, will propagate to mdmon, should it need to be >> > started. >> > >> >> And what shall non-systemd systems do? > > Add the file, of course! > >> >> I don't have /etc/initrd-release in my initramfs-tools generated >> initrd, and so far didn't have a usecase for it. >> Should it be an empty file? >> > > Yep, just an empty file. It only serves to be a marker since there really > isn't any other heuristic for detecting early userspace. > This is a bit backwards. As far as I understand the systemd & udev merge now means that udev rules cannot spawn long running processes and instead should have a proper systemd units instead. And since systemd is running all of the initramfs surely it can set up an environment without adding pointless files, e.g. an environment variable? Please correct me, if I am wrong, cause I really don't understand either this patch or systemd or both. >> >> > Signed-off-by: Dave Reisner <dreisner@xxxxxxxxxxxxx> >> > --- >> > mdadm.c | 5 +++++ >> > 1 file changed, 5 insertions(+) >> > >> > diff --git a/mdadm.c b/mdadm.c >> > index 4c7c5ea..557e00b 100644 >> > --- a/mdadm.c >> > +++ b/mdadm.c >> > @@ -1106,6 +1106,11 @@ int main(int argc, char *argv[]) >> > exit(0); >> > } >> > >> > + /* auto-detect being on an initramfs >> > + * >> > http://www.freedesktop.org/wiki/Software/systemd/InitrdInterface */ >> > + if (access("/etc/initrd-release", F_OK) == 0) >> > + __offroot = 1; >> > + >> > if (!mode && devs_found) { >> > mode = MISC; >> > devmode = 'Q'; >> > -- >> > 1.7.12.1 >> > >> > -- >> > To unsubscribe from this list: send the line "unsubscribe linux-raid" in >> > the body of a message to majordomo@xxxxxxxxxxxxxxx >> > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
