improved handling of nested transactions

add nested transaction support to protocol
allow deferring validation to parent transaction
process each update request within a nested transaction

1 files changed, 6 insertions, 8 deletions

diff --git a/dev-shell b/dev-shell
index aeaedc9..397c7af 100755
--- a/dev-shell
+++ b/dev-shell
@@ -21,6 +21,7 @@ function _acf_start_req {
     local var=ACF_$3
     shift 3
 
+    local current=${!var}
     eval "export $var=\$(_acf_req \"\$url\" \"\$@\" \
         -D /proc/self/fd/1 -o /proc/self/fd/3 | \
 	sed 's/^$hdr: \\(.\\+\\)'\$'\\r''\$/\\1/;ta;d;:a;q')"
@@ -28,7 +29,7 @@ function _acf_start_req {
 
     bash --rcfile "$ACF_QD_CLI" && _acf_req $url -X DELETE
 
-    eval $var=
+    eval $var=$current
 }
 
 if [ "$ACF_AUTH_TOKEN" ]; then
@@ -55,12 +56,7 @@ EOF
     PS1="$ACF_USER@acf2-dev-shell${ACF_TXN_ID:+($ACF_TXN_ID)}> "
 
     function start {
-	if [ "$ACF_TXN_ID" ]; then
-	    echo "Nested transactions not yet supported" >&2
-	    return 1
-	else
-	    _acf_start_req / Transaction-ID TXN_ID -X POST
-	fi
+	_acf_start_req / Transaction-ID TXN_ID -X POST
     }
 
     function _acf_obj_req {
@@ -83,7 +79,7 @@ EOF
 
     function commit {
 	if [ "$ACF_TXN_ID" ]; then
-	    if _acf_req / -X POST; then
+	    if _acf_req / -X PUT; then
 		echo Committed >&2
 		exit 1
 	    fi
@@ -145,6 +141,8 @@ EOF
 	echo >&2
     fi
 
+    ACF_TXN_ID=
+
     _acf_start_req /login Auth-Token AUTH_TOKEN \
 	-d "{\"username\": \"$ACF_USER\", \"password\": \"$PASSWORD\"}"
 fi