[PATCH v3 0/3] use shuf to choose a random file

[Naohiro Aota <naohiro.aota@wdc.com>]

Currently, we use "ls ... | sort -R | head -n1" (or tail) to choose a
random file in a directory.It sorts the files with "ls", sort it randomly
and pick the first line, which wastes the "ls" sort.

Also, using "sort -R | head -n1" is inefficient. Furthermore, even without
"head" or "tail", "shuf" is faster than "sort -R".

This series introduces a new helper _random_file() to choose a file in a
directory randomly. Also, replace "sort -R" with _random_file() or "shuf".

Changes:
- v2
  - Introduce _random_file() helper
  - Rewrite other "sort -R" with _random_file() or "shuf"
- v3
  - Fix _random_file() helper to add the base directory as prefix

Naohiro Aota (3):
  common/rc: introduce _random_file() helper
  fstests/btrfs: use _random_file() helper
  btrfs/004: use shuf to shuffle the file lines

 common/rc       |  7 +++++++
 tests/btrfs/004 |  2 +-
 tests/btrfs/179 |  9 ++++-----
 tests/btrfs/192 | 14 ++++----------
 4 files changed, 16 insertions(+), 16 deletions(-)

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2.41.0