tests: add .sh and .pl suffixes to shell and perl tests, respectively

Not only this shrinks the size of the generated Makefile (from > 6300
lines to ~3000), but will allow further simplifications in future
changes.

* tests/Makefile.am (TEST_EXTENSIONS): Add '.sh' and '.pl'.
(PL_LOG_COMPILER, SH_LOG_COMPILER): New, still defined simply to
$(LOG_COMPILER) for the time being.
(TESTS, root_tests): Adjust as described.
* All tests: Rename as described.

tests/du/basic.sh

@@ -0,0 +1,89 @@
+#!/bin/sh
+# Compare actual numbers from du, assuming block size matches mine.
+
+# Copyright (C) 2003-2012 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+print_ver_ du
+
+mkdir -p a/b d d/sub || framework_failure_
+
+# Ensure that these files contain more than 64 bytes, so that we don't
+# immediately disqualify file systems (e.g., NetApp) on which smaller
+# files take up zero disk blocks.
+printf '%*s' 257 make-sure-the-file-is-non-empty > a/b/F || framework_failure_
+printf %4096s x > d/1
+cp d/1 d/sub/2
+
+
+B=$(stat --format=%B a/b/F)
+
+du --block-size=$B -a a > out || fail=1
+echo === >> out
+du --block-size=$B -a -S a >> out || fail=1
+echo === >> out
+du --block-size=$B -s a >> out || fail=1
+
+f=$(stat --format=%b a/b/F)
+b=$(stat --format=%b a/b)
+a=$(stat --format=%b a)
+bf=$(expr $b + $f)
+tot=$(expr $bf + $a)
+
+cat <<EOF | sed 's/ *#.*//' > exp
+$f	a/b/F
+$bf	a/b
+$tot	a
+===
+$f	a/b/F   # size of file, a/b/F
+$bf	a/b     # size of dir entry, a/b, + size of file, a/b/F
+$a	a       # size of dir entry, a
+===
+$tot	a
+EOF
+
+compare exp out || fail=1
+
+# Perform this test only if "." is on a local file system.
+# Otherwise, it would fail e.g., on an NFS-mounted Solaris ZFS file system.
+if is_local_dir_ .; then
+  rm -f out exp
+  du --block-size=$B -a d | sort -r -k2,2 > out || fail=1
+  echo === >> out
+  du --block-size=$B -S d | sort -r -k2,2 >> out || fail=1
+
+  t2=$(stat --format=%b d/sub/2)
+  ts=$(stat --format=%b d/sub)
+  t1=$(stat --format=%b d/1)
+  td=$(stat --format=%b d)
+  tot=$(expr $t1 + $t2 + $ts + $td)
+  d1=$(expr $td + $t1)
+  s2=$(expr $ts + $t2)
+
+  cat <<EOF | sed 's/ *#.*//' > exp
+$t2	d/sub/2
+$s2	d/sub
+$t1	d/1
+$tot	d
+===
+$s2	d/sub
+$d1	d           # d + d/1; don't count the dir. entry for d/sub
+EOF
+
+  compare exp out || fail=1
+fi
+
+Exit $fail