diff --git a/libexec/sourcezap/commands/sourcezap-checkout b/libexec/sourcezap/commands/sourcezap-checkout
index 39db0f6..dc6ca76 100755
--- a/libexec/sourcezap/commands/sourcezap-checkout
+++ b/libexec/sourcezap/commands/sourcezap-checkout
@@ -12,7 +12,7 @@ branch=$2
 # functions
 git()
 {
-    "${libexec}"/utils/git "${@}"
+    "${libexec}"/utils/git/run "${@}"
 }
 
 printok()
@@ -38,7 +38,7 @@ if ! "${libexec}"/utils/issourcezap-member > /dev/null 2>&1; then
 fi
 
 if [ ! -e "${gitdir}/.git" ]; then
-    printerr "try 'portzap clone' instead"
+    printerr "try 'sourcezap clone' instead"
     exit 1
 fi
 
diff --git a/libexec/sourcezap/commands/sourcezap-clone b/libexec/sourcezap/commands/sourcezap-clone
index ac68c78..31dfaf8 100755
--- a/libexec/sourcezap/commands/sourcezap-clone
+++ b/libexec/sourcezap/commands/sourcezap-clone
@@ -13,7 +13,7 @@ branch=$3
 # functions
 git()
 {
-    "${libexec}"/utils/git "${@}"
+    "${libexec}"/utils/git/run "${@}"
 }
 
 printok()
diff --git a/libexec/sourcezap/commands/sourcezap-install b/libexec/sourcezap/commands/sourcezap-install
index da916a0..735032c 100755
--- a/libexec/sourcezap/commands/sourcezap-install
+++ b/libexec/sourcezap/commands/sourcezap-install
@@ -15,8 +15,8 @@ revfile=$3
 perform_update()
 {
     rev=$(cat "${revfile}")
-    add=$("${libexec}"/utils/git-changed-files "${gitdir}" "${rev}")
-    del=$("${libexec}"/utils/git-removed-files "${gitdir}" "${rev}")
+    add=$("${libexec}"/utils/git/get-changed-files "${gitdir}" "${rev}")
+    del=$("${libexec}"/utils/git/get-removed-files "${gitdir}" "${rev}")
     for file in ${del}; do
         target="${installdir}/${file}"
         parent=$(dirname "${target}")
@@ -63,6 +63,11 @@ run_install()
     install -o root -g _sourcezap -m "${mode}" -v "$@"
 }
 
+git()
+{
+    "${libexec}"/utils/git/run "${@}"
+}
+
 printok()
 {
     "${libexec}"/utils/printok "${1}"
@@ -91,5 +96,5 @@ if [ -e "${revfile}" ]; then
 else
     perform_install
 fi
-"${libexec}"/utils/git-rev "${gitdir}" > "${revfile}"
+"${libexec}"/utils/git/run rev-parse HEAD > "${revfile}"
 printok "install complete"
diff --git a/libexec/sourcezap/commands/sourcezap-pull b/libexec/sourcezap/commands/sourcezap-pull
index 84adb47..e40b731 100755
--- a/libexec/sourcezap/commands/sourcezap-pull
+++ b/libexec/sourcezap/commands/sourcezap-pull
@@ -11,7 +11,7 @@ gitdir=$1
 # functions
 git()
 {
-    "${libexec}"/utils/git "${@}"
+    "${libexec}"/utils/git/run "${@}"
 }
 
 printok()
diff --git a/libexec/sourcezap/utils/git-rev b/libexec/sourcezap/utils/git-rev
deleted file mode 100755
index db476b1..0000000
--- a/libexec/sourcezap/utils/git-rev
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/bin/sh
-set -e
-
-##
-# variables
-localbase=${LOCALBASE:-$(realpath "$(dirname "$0")"/../../..)}
-libexec="${localbase}"/libexec/sourcezap
-gitdir=$1
-
-##
-# functions
-git()
-{
-    "${libexec}"/utils/git "${1}"
-}
-
-##
-# main
-cd "${gitdir}"
-git rev-parse HEAD
diff --git a/libexec/sourcezap/utils/git-changed-files b/libexec/sourcezap/utils/git/get-changed-files
similarity index 55%
rename from libexec/sourcezap/utils/git-changed-files
rename to libexec/sourcezap/utils/git/get-changed-files
index 4624d3d..ae70856 100755
--- a/libexec/sourcezap/utils/git-changed-files
+++ b/libexec/sourcezap/utils/git/get-changed-files
@@ -10,13 +10,13 @@ commit=$2
 
 ##
 # functions
-diff()
+git()
 {
-    "${libexec}"/utils/gitdiff ${@}
+    "${libexec}"/utils/git/run "${@}"
 }
 
 ##
 # main
 cd "${gitdir}"
-diff "--name-only" "--diff-filter=A" "${commit}" "HEAD"
-diff "--name-only" "--diff-filter=M" "${commit}" "HEAD"
+git diff -l0 --name-only --diff-filter=A "${commit}" "HEAD"
+git diff -l0 --name-only --diff-filter=M "${commit}" "HEAD"
diff --git a/libexec/sourcezap/utils/git-removed-files b/libexec/sourcezap/utils/git/get-removed-files
similarity index 66%
rename from libexec/sourcezap/utils/git-removed-files
rename to libexec/sourcezap/utils/git/get-removed-files
index 6531505..4ce4492 100755
--- a/libexec/sourcezap/utils/git-removed-files
+++ b/libexec/sourcezap/utils/git/get-removed-files
@@ -10,12 +10,12 @@ commit=$2
 
 ##
 # functions
-diff()
+git()
 {
-    "${libexec}"/utils/gitdiff ${@}
+    "${libexec}"/utils/git/run "${@}"
 }
 
 ##
 # main
 cd "${gitdir}"
-diff "--name-only" "--diff-filter=D" "${commit}" "HEAD"
+git diff -l0 --name-only --diff-filter=D "${commit}" "HEAD"
diff --git a/libexec/sourcezap/utils/git b/libexec/sourcezap/utils/git/run
similarity index 100%
rename from libexec/sourcezap/utils/git
rename to libexec/sourcezap/utils/git/run
diff --git a/libexec/sourcezap/utils/gitdiff b/libexec/sourcezap/utils/gitdiff
deleted file mode 100755
index b1f0b7b..0000000
--- a/libexec/sourcezap/utils/gitdiff
+++ /dev/null
@@ -1,11 +0,0 @@
-#!/bin/sh
-set -e
-
-##
-# variables
-localbase=${LOCALBASE:-$(realpath "$(dirname "$0")"/../../..)}
-libexec="${localbase}"/libexec/sourcezap
-
-##
-# main
-"${libexec}"/utils/git diff -l0 ${@}