Add support to disable udev checking: DM_UDEV_DISABLE_CHECKING=1 env. variable.

Sometimes it is really needed to switch off udev checking and the warnings we show when
we detect that udev has not done its job right - the messages like "Udev should have done
this and that. Falling back to direct node creation/removal. " etc.

This would be especially handy while setting DM_DEV_DIR env var that could be set to a
different location than standard /dev (udev can't create nodes/symlinks out of that one
directory that is configured into udevd). The exact same situation happens while we're
running our tests.

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/dmsetup.c b/tools/dmsetup.c
index d81032b5..d62e1471 100644
--- a/tools/dmsetup.c
+++ b/tools/dmsetup.c
@@ -3158,6 +3158,7 @@ int main(int argc, char **argv)
 	struct command *c;
 	int r = 1;
 	const char *dev_dir;
+	const char *disable_udev_checking;
 
 	(void) setlocale(LC_ALL, "");
 
@@ -3207,6 +3208,11 @@ int main(int argc, char **argv)
 	if (_switches[NOUDEVSYNC_ARG])
 		dm_udev_set_sync_support(0);
 
+	disable_udev_checking = getenv("DM_UDEV_DISABLE_CHECKING");
+	if ((disable_udev_checking && *disable_udev_checking) &&
+	    !strcmp(disable_udev_checking, "1"))
+		dm_udev_set_checking(0);
+
       doit:
 	if (!c->fn(argc, argv, NULL)) {
 		fprintf(stderr, "Command failed\n");