[PATCH 2/2] common/config: implement set_prog_path() using 'type -P'

[Eric Biggers <ebiggers3@gmail.com>]

From: Eric Biggers <ebiggers@google.com>

Bash's 'type -P' builtin is equivalent to 'which', but it's more
efficient because it doesn't involve executing an external binary.
Because set_prog_path() is executed 60+ times in common/config, which is
sourced by common/rc, which in turn is sourced by every test, switching
to 'type -P' actually can make a noticeable performance improvement for
short-running or skipped tests.  For example:

Before:
    # time ./check generic/002
    ...
    Passed all 1 tests

    real    0m1.365s
    user    0m0.746s
    sys     0m0.644s

After:
    # time ./check generic/002
    ...
    Passed all 1 tests

    real    0m1.026s
    user    0m0.511s
    sys     0m0.470s

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 common/config | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/common/config b/common/config
index b29c0eb0..8211356c 100644
--- a/common/config
+++ b/common/config
@@ -96,12 +96,7 @@ export RECREATE_TEST_DEV=false
 # $1 = prog to look for
 set_prog_path()
 {
-    p=`which $1 2> /dev/null`
-    if [ -n "$p" -a -x "$p" ]; then
-        echo $p
-        return 0
-    fi
-    return 1
+	type -P $1
 }
 
 # Handle mkfs.btrfs which does (or does not) require -f to overwrite
-- 
2.13.0.rc1.294.g07d810a77f-goog