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[PATCH] maint: simplify parsing df's output in shell scripts
From: |
Bernhard Voelker |
Subject: |
[PATCH] maint: simplify parsing df's output in shell scripts |
Date: |
Fri, 4 Jul 2014 01:57:52 +0200 |
Avoid complicated and error-prone parsing of df's output via
sed(1), cut(1), etc., and instead use df's more modern --output
option.
* src/ioblksize.h (in a comment): Simplify the extraction of the
device name of the mounted file system from df's output.
* tests/dd/skip-seek-past-dev.sh: Likewise.
* tests/du/2g.sh: Likewise for the 'avail' column here.
Also avoid the deprecated use of "tail -NUM".
* tests/misc/stat-mount.sh: While at it, remove the determination
of the mount point of "." via df(1) plus sed(1) as it is unused
since commit v8.5-159-gf57cb37 anyway. Instead, improve this test
by verifying that the output of "stat -c%m ." at least starts with
a slash '/'.
---
src/ioblksize.h | 2 +-
tests/dd/skip-seek-past-dev.sh | 2 +-
tests/du/2g.sh | 5 +----
tests/misc/stat-mount.sh | 6 ++++--
4 files changed, 7 insertions(+), 8 deletions(-)
diff --git a/src/ioblksize.h b/src/ioblksize.h
index 276d38f..55aaeae 100644
--- a/src/ioblksize.h
+++ b/src/ioblksize.h
@@ -63,7 +63,7 @@
the readahead setting is 128KiB which was read using:
file="."
- device=$(df -P --local "$file" | tail -n1 | cut -d' ' -f1)
+ device=$(df --output=source --local "$file" | tail -n1)
echo $(( $(blockdev --getra $device) * 512 ))
However there isn't a portable way to get the above.
diff --git a/tests/dd/skip-seek-past-dev.sh b/tests/dd/skip-seek-past-dev.sh
index caa2314..5eb7ab5 100755
--- a/tests/dd/skip-seek-past-dev.sh
+++ b/tests/dd/skip-seek-past-dev.sh
@@ -33,7 +33,7 @@ get_device_size() {
# Get path to device the current dir is on.
# Note df can only get fs size, not device size.
-device=$(df -P . | tail -n1 | cut -d' ' -f1) || framework_failure_
+device=$(df --output=source . | tail -n1) || framework_failure_
dev_size=$(get_device_size "$device") ||
skip_ "failed to determine size of $device"
diff --git a/tests/du/2g.sh b/tests/du/2g.sh
index cfd1fc4..f766d4d 100755
--- a/tests/du/2g.sh
+++ b/tests/du/2g.sh
@@ -27,10 +27,7 @@ very_expensive_
# Get number of free kilobytes on current partition, so we can
# skip this test if there is insufficient free space.
-
-# This technique relies on the fact that the 'Available' kilobyte
-# count is the number just before the one with a trailing '%'.
-free_kb=$(df -kP .|tail -1|sed 's/ [0-9][0-9]*%.*//;s/ *$//;s/.* //')
+free_kb=$(df -k --output=avail . | tail -n1)
case "$free_kb" in
[0-9]*) ;;
*) skip_ "invalid size from df: $free_kb";;
diff --git a/tests/misc/stat-mount.sh b/tests/misc/stat-mount.sh
index 814d23c..ab1ff47 100755
--- a/tests/misc/stat-mount.sh
+++ b/tests/misc/stat-mount.sh
@@ -19,8 +19,10 @@
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ stat
-df_mnt=$(df -P . | sed -n '2s/.* \([^ ]*$\)/\1/p')
stat_mnt=$(stat -c%m .) || fail=1
-test "$stat_mnt" || fail=1
+case "$stat_mnt" in
+ /*) ;;
+ *) fail=1;;
+esac
Exit $fail
--
1.8.4.5
- [PATCH] maint: simplify parsing df's output in shell scripts,
Bernhard Voelker <=