linux-ext4 - [PATCH 2/2] e2scrub_all: fix broken stdin redirection

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Date:   Mon, 04 Nov 2019 17:54:20 -0800
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     tytso@....edu, darrick.wong@...cle.com
Cc:     linux-ext4@...r.kernel.org, gregor herrmann <gregoa@...ian.org>
Subject: [PATCH 2/2] e2scrub_all: fix broken stdin redirection

From: Darrick J. Wong <darrick.wong@...cle.com>

gregor herrmann reports that the weekly e2scrub cronjob emits these
errors:

/sbin/e2scrub_all: line 173: /proc/8234/fd/pipe:[90083173]: No such file or directory

The root cause of this is that the ls_targets stdout is piped to stdin
to the entire ls_targets loop body to prevent the loop body from reading
the loop iteration items.  Remove all the broken hackery by reading the
target list into a bash array and iterating the bash array.

Addresses-Debian-Bug: #944033

Reported-by: gregor herrmann <gregoa@...ian.org>
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 scrub/e2scrub_all.in |   14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)


diff --git a/scrub/e2scrub_all.in b/scrub/e2scrub_all.in
index 72e66ff6..f0336711 100644
--- a/scrub/e2scrub_all.in
+++ b/scrub/e2scrub_all.in
@@ -101,6 +101,12 @@ exec 3<&-
 # indicating success to avoid spamming the sysadmin with fail messages
 # when e2scrub_all is run out of cron or a systemd timer.
 
+if ! type mapfile >& /dev/null ; then
+    test -n "${SERVICE_MODE}" && exitcode 0
+    echo "e2scrub_all: can't find mapfile --- is bash 4.xx installed?"
+    exitcode 1
+fi
+
 if ! type lsblk >& /dev/null ; then
     test -n "${SERVICE_MODE}" && exitcode 0
     echo "e2scrub_all: can't find lsblk --- is util-linux installed?"
@@ -165,13 +171,13 @@ escape_path_for_systemd() {
 }
 
 # Scrub any mounted fs on lvm by creating a snapshot and fscking that.
-stdin="$(realpath /dev/stdin)"
-ls_targets | while read tgt; do
+mapfile -t targets < <(ls_targets)
+for tgt in "${targets[@]}"; do
 	# If we're not reaping and systemd is present, try invoking the
 	# systemd service.
 	if [ "${reap}" -ne 1 ] && type systemctl > /dev/null 2>&1; then
 		tgt_esc="$(escape_path_for_systemd "${tgt}")"
-		${DBG} systemctl start "e2scrub@...gt_esc}" 2> /dev/null < "${stdin}"
+		${DBG} systemctl start "e2scrub@...gt_esc}" 2> /dev/null
 		res=$?
 		if [ "${res}" -eq 0 ] || [ "${res}" -eq 1 ]; then
 			continue;
@@ -179,7 +185,7 @@ ls_targets | while read tgt; do
 	fi
 
 	# Otherwise use direct invocation
-	${DBG} "@root_sbindir@...scrub" ${scrub_args} "${tgt}" < "${stdin}"
+	${DBG} "@root_sbindir@...scrub" ${scrub_args} "${tgt}"
 done
 
 exitcode 0