From: Jes Sorensen <Jes.Sorensen@xxxxxxxxxx>
When --offroot is specified, mdadm will change the first character of
argv[0] to '@'. This is used to signal to systemd that mdadm was
launched from initramfs and should not be shut down before returning
to the initramfs.
Signed-off-by: Jes Sorensen <Jes.Sorensen@xxxxxxxxxx>
---
ReadMe.c | 5 +++++
mdadm.8.in | 12 ++++++++++++
mdadm.c | 9 +++++++++
mdadm.h | 1 +
4 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/ReadMe.c b/ReadMe.c
index 9aa798b..a60e11b 100644
--- a/ReadMe.c
+++ b/ReadMe.c
@@ -111,6 +111,7 @@ struct option long_options[] = {
{"kill-subarray", 1, 0, KillSubarray},
{"update-subarray", 1, 0, UpdateSubarray},
{"udev-rules", 2, 0, UdevRules},
+ {"offroot", 0, 0, OffRootOpt},
/* synonyms */
{"monitor", 0, 0, 'F'},
@@ -268,6 +269,10 @@ char OptionHelp[] =
" --query -Q : Display general information about how a\n"
" device relates to the md driver\n"
" --auto-detect : Start arrays auto-detected by the kernel\n"
+" --offroot : Set first character of argv[0] to @ to indicate the\n"
+" application was launched from initrd/initramfs and\n"
+" should not be shutdown by systemd as part of the\n"
+" regular shutdown process.\n"
;
/*
"\n"
diff --git a/mdadm.8.in b/mdadm.8.in
index 27be110..4f06a88 100644
--- a/mdadm.8.in
+++ b/mdadm.8.in
@@ -255,6 +255,18 @@ Avoid printing purely informative messages. With this,
will be silent unless there is something really important to report.
.TP
+.BR \-\-offroot
+Set first character of argv[0] to @ to indicate mdadm was launched
+from initrd/initramfs and should not be shutdown by systemd as part of
+the regular shutdown process. This option is normally only used by
+the system's initscripts. Please see here for more details on how
+systemd handled argv[0]:
+.IP
+.B http://www.freedesktop.org/wiki/Software/systemd/RootStorageDaemons
+.PP
+
+
+.TP
.BR \-f ", " \-\-force
Be more forceful about certain operations. See the various modes for
the exact meaning of this option in different contexts.
diff --git a/mdadm.c b/mdadm.c
index f07fac2..78f28d5 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -174,6 +174,15 @@ int main(int argc, char *argv[])
homehost = optarg;
continue;
+ /*
+ * --offroot sets first char of argv[0] to @. This is used
+ * by systemd to signal that the tast was launched from
+ * initrd/initramfs and should be preserved during shutdown
+ */
+ case OffRootOpt:
+ argv[0][0] = '@';
+ continue;
+
case ':':
case '?':
fputs(Usage, stderr);
diff --git a/mdadm.h b/mdadm.h
index 381ef86..fec93aa 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -321,6 +321,7 @@ enum special_options {
UdevRules,
FreezeReshape,
Continue,
+ OffRootOpt,
};
/* structures read from config file */
--
1.7.8.3
--
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