Fix ASSERT in zfs_receive_one()

This commit fixes the following ASSERT in zfs_receive_one() when
receiving a send stream from a root dataset with the "-e" option:

    $ sudo zfs snap source@snap
    $ sudo zfs send source@snap | sudo zfs recv -e destination/recv
    chopprefix > drrb->drr_toname
    ASSERT at libzfs_sendrecv.c:3804:zfs_receive_one()

Reviewed-by: Tom Caputi <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed by: Paul Dagnelie <[email protected]>
Signed-off-by: loli10K <[email protected]>
Closes #8121 

1 files changed, 16 insertions, 1 deletions

diff --git a/cmd/zfs/zfs_main.c b/cmd/zfs/zfs_main.c
index 2b7fe9303..6b08bb115 100644
--- a/cmd/zfs/zfs_main.c
+++ b/cmd/zfs/zfs_main.c
@@ -4240,10 +4240,21 @@ zfs_do_receive(int argc, char **argv)
 			}
 			break;
 		case 'd':
+			if (flags.istail) {
+				(void) fprintf(stderr, gettext("invalid option "
+				    "combination: -d and -e are mutually "
+				    "exclusive\n"));
+				usage(B_FALSE);
+			}
 			flags.isprefix = B_TRUE;
 			break;
 		case 'e':
-			flags.isprefix = B_TRUE;
+			if (flags.isprefix) {
+				(void) fprintf(stderr, gettext("invalid option "
+				    "combination: -d and -e are mutually "
+				    "exclusive\n"));
+				usage(B_FALSE);
+			}
 			flags.istail = B_TRUE;
 			break;
 		case 'n':
@@ -4279,6 +4290,10 @@ zfs_do_receive(int argc, char **argv)
 	argc -= optind;
 	argv += optind;
 
+	/* zfs recv -e (use "tail" name) implies -d (remove dataset "head") */
+	if (flags.istail)
+		flags.isprefix = B_TRUE;
+
 	/* check number of arguments */
 	if (argc < 1) {
 		(void) fprintf(stderr, gettext("missing snapshot argument\n"));