core: Make commit always operate on directory contents, not file list

This simplifies things significantly, at some cost in flexibility.
We'll later add the ability to e.g. filter out files by regular
expression.

tests/t0000-basic.sh

@@ -71,8 +71,8 @@ mkdir -p another/nested/tree
 echo anotherone > another/nested/tree/1
 echo whee2 > another/whee
 # FIXME - remove grep for .
-find | grep -v '^\.$' | $OSTREE commit -b test2 -s "From find" --from-stdin
-echo "ok stdin commit"
+$OSTREE commit -b test2 -s "Another commit"
+echo "ok commit"
 
 cd ${test_tmpdir}
 $OSTREE checkout test2 $test_tmpdir/checkout-test2-3

tests/t0004-compose.sh

@@ -35,7 +35,7 @@ echo 'an ELF file' > usr/lib/libfoo.so
 mkdir -p usr/share
 echo 'some data' > usr/share/foo.data
 
-find | grep -v '^\.$' | $OSTREE commit -b artifact-libfoo-runtime -s 'Build 12345 of libfoo' --from-stdin
+$OSTREE commit -b artifact-libfoo-runtime -s 'Build 12345 of libfoo'
 
 cd "${test_tmpdir}"
 mkdir artifact-libfoo-devel
@@ -45,7 +45,7 @@ echo 'a header' > usr/include/foo.h
 mkdir -p usr/share/doc
 echo 'some documentation' > usr/share/doc/foo.txt
 
-find | grep -v '^\.$' | $OSTREE commit -b artifact-libfoo-devel -s 'Build 12345 of libfoo' --from-stdin
+$OSTREE commit -b artifact-libfoo-devel -s 'Build 12345 of libfoo'
 
 cd "${test_tmpdir}"
 mkdir artifact-barapp
@@ -53,7 +53,7 @@ cd artifact-barapp
 mkdir -p usr/bin
 echo 'another ELF file' > usr/bin/bar
 
-find | grep -v '^\.$' | $OSTREE commit -b artifact-barapp -s 'Build 42 of barapp' --from-stdin
+$OSTREE commit -b artifact-barapp -s 'Build 42 of barapp'
 
 echo 'ok artifacts committed'