diff --git a/libexec/sourcezap/utils/git-changed-files b/libexec/sourcezap/utils/git-changed-files
index 6a84d79..4624d3d 100755
--- a/libexec/sourcezap/utils/git-changed-files
+++ b/libexec/sourcezap/utils/git-changed-files
@@ -10,15 +10,13 @@ commit=$2
 
 ##
 # functions
-gitexec()
+diff()
 {
-    "${libexec}"/utils/gitexec "${1}"
+    "${libexec}"/utils/gitdiff ${@}
 }
 
 ##
 # main
 cd "${gitdir}"
-add=$(gitexec "diff --name-only --diff-filter=A ${commit} HEAD")
-mod=$(gitexec "diff --name-only --diff-filter=M ${commit} HEAD")
-echo "${add}"
-echo "${mod}"
+diff "--name-only" "--diff-filter=A" "${commit}" "HEAD"
+diff "--name-only" "--diff-filter=M" "${commit}" "HEAD"
diff --git a/libexec/sourcezap/utils/git-removed-files b/libexec/sourcezap/utils/git-removed-files
index 21ff236..6531505 100755
--- a/libexec/sourcezap/utils/git-removed-files
+++ b/libexec/sourcezap/utils/git-removed-files
@@ -10,12 +10,12 @@ commit=$2
 
 ##
 # functions
-gitexec()
+diff()
 {
-    "${libexec}"/utils/gitexec "${1}"
+    "${libexec}"/utils/gitdiff ${@}
 }
 
 ##
 # main
 cd "${gitdir}"
-gitexec "diff --name-only --diff-filter=D ${commit} HEAD"
+diff "--name-only" "--diff-filter=D" "${commit}" "HEAD"
diff --git a/libexec/sourcezap/utils/gitdiff b/libexec/sourcezap/utils/gitdiff
new file mode 100755
index 0000000..52a3ee4
--- /dev/null
+++ b/libexec/sourcezap/utils/gitdiff
@@ -0,0 +1,11 @@
+#!/bin/sh
+set -e
+
+##
+# variables
+localbase=${LOCALBASE:-$(realpath "$(dirname "$0")"/../../..)}
+libexec="${localbase}"/libexec/sourcezap
+
+##
+# main
+"${libexec}"/utils/gitexec diff -l0 ${@}