From: Jes Sorensen <Jes.Sorensen@xxxxxxxxxx>
When --initrd is parsed, 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 | 3 +++
mdadm.c | 10 ++++++++++
mdadm.h | 1 +
3 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/ReadMe.c b/ReadMe.c
index 9aa798b..49dc04f 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},
+ {"initrd", 0, 0, InitrdOpt},
/* synonyms */
{"monitor", 0, 0, 'F'},
@@ -268,6 +269,8 @@ 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"
+" --initrd : Set first character of argv[0] to @ to indicate the\n"
+" application was launched from initrd.\n"
;
/*
"\n"
diff --git a/mdadm.c b/mdadm.c
index f07fac2..c0ccf55 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -174,6 +174,16 @@ int main(int argc, char *argv[])
homehost = optarg;
continue;
+ /*
+ * --initrd 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 InitrdOpt:
+ c = argv[0];
+ c[0] = '@';
+ continue;
+
case ':':
case '?':
fputs(Usage, stderr);
diff --git a/mdadm.h b/mdadm.h
index 381ef86..d1ac1e8 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -321,6 +321,7 @@ enum special_options {
UdevRules,
FreezeReshape,
Continue,
+ InitrdOpt,
};
/* structures read from config file */
--
1.7.8.3
--
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