core: Add 'cat' builtin

tests/t0000-basic.sh

@@ -19,7 +19,7 @@
 
 set -e
 
-echo "1..25"
+echo "1..26"
 
 . libtest.sh
 
@@ -185,3 +185,8 @@ echo "ok commit statoverridde"
 cd ${test_tmpdir}
 $OSTREE prune
 echo "ok prune didn't fail"
+
+cd ${test_tmpdir}
+$OSTREE cat test2 /yet/another/tree/green > greenfile-contents
+assert_file_has_content greenfile-contents "leaf"
+echo "ok cat-file"

tests/t0001-archive.sh

@@ -21,7 +21,7 @@ set -e
 
 . libtest.sh
 
-echo '1..9'
+echo '1..10'
 
 setup_test_repository "archive"
 echo "ok setup"
@@ -62,3 +62,8 @@ echo "ok uid0 ls"
 
 $OSTREE checkout -U test2-uid0 checkout-user-test2-uid0
 echo "ok user checkout from uid 0"
+
+cd ${test_tmpdir}
+$OSTREE cat test2 /baz/cow > cow-contents
+assert_file_has_content cow-contents "moo"
+echo "ok cat-file"