linux-ext4 - [PATCH 5/9] e2fscrub: add the -n option which shows what commands e2scrub would execute

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Date:   Wed, 20 Mar 2019 22:02:14 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:     darrick.wong@...cle.com, "Theodore Ts'o" <tytso@....edu>
Subject: [PATCH 5/9] e2fscrub: add the -n option which shows what commands e2scrub would execute

Signed-off-by: Theodore Ts'o <tytso@....edu>
---
 scrub/e2scrub.8.in | 5 +++++
 scrub/e2scrub.in   | 6 ++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/scrub/e2scrub.8.in b/scrub/e2scrub.8.in
index ff03523e3..7342876a3 100644
--- a/scrub/e2scrub.8.in
+++ b/scrub/e2scrub.8.in
@@ -38,6 +38,11 @@ If the filesystem is not repaired,
 will be run before the next mount.
 .SH OPTIONS
 .TP
+\fB-n\fR
+Print what commands
+.B e2scrub
+would execute (but don't actually execute them).
+.TP
 \fB-r\fR
 Remove the e2scrub snapshot and exit without checking anything.
 .TP
diff --git a/scrub/e2scrub.in b/scrub/e2scrub.in
index 51a909373..301574968 100644
--- a/scrub/e2scrub.in
+++ b/scrub/e2scrub.in
@@ -37,6 +37,7 @@ print_help() {
 	echo "Usage: $0 [OPTIONS] mountpoint | device"
 	echo
 	echo "mountpoint must be on a LVM-managed block device"
+	echo "-n: Show what commands e2scrub would execute."
 	echo "-r: Remove e2scrub snapshot and exit, do not check anything."
 	echo "-t: Run fstrim if successful."
 	echo "-V: Print version information and exit."
@@ -68,8 +69,9 @@ exitcode() {
 	exit "${ret}"
 }
 
-while getopts "rtV" opt; do
-	case "${opt}" in
+while getopts "nrtV" opt; do
+    case "${opt}" in
+	"n") DBG="echo Would execute: " ;;
 	"r") reap=1;;
 	"t") fstrim=1;;
 	"V") print_version; exitcode 0;;
-- 
2.19.1