diff --git a/action.yml b/action.yml
index c40d304..71363ca 100644
--- a/action.yml
+++ b/action.yml
@@ -46,6 +46,9 @@ runs:
       shell: bash
 
     - id: install
+      env:
+        GIT_USER: ${{ inputs.git-user }}
+        GIT_USER_EMAIL: ${{ inputs.git-user-email }}
       run: ${GITHUB_ACTION_PATH}/install.sh
       shell: bash
 
@@ -62,7 +65,5 @@ runs:
       if: ${{ inputs.install-only != 'true' }}
       run: |
         ${GITHUB_ACTION_PATH}/cog.sh \
-        "${{ inputs.git-user }}" \
-        "${{ inputs.git-user-email }}" \
         "${{ inputs.command }}" \
         "${{ inputs.args }}"
diff --git a/cog.sh b/cog.sh
index f56f06a..1187d15 100755
--- a/cog.sh
+++ b/cog.sh
@@ -2,16 +2,9 @@
 
 set -a
 
-GIT_USER="${1}"
-GIT_USER_EMAIL="${2}"
-COMMAND="${3}"
-ARGS="${4}"
-
-echo "Setting git user : ${GIT_USER}"
-git config --global user.name "${GIT_USER}"
-
-echo "Setting git user email ${GIT_USER_EMAIL}"
-git config --global user.email "${GIT_USER_EMAIL}"
+COMMAND="${1}"
+shift
+ARGS="${*}"
 
 cog --version
 
diff --git a/install.sh b/install.sh
index d5745ee..646e610 100755
--- a/install.sh
+++ b/install.sh
@@ -45,3 +45,13 @@ else
     tar --strip-components=1 -xzf $TAR "$ARCH-$PLATFORM/cog"
 fi
 cd "$CUR_DIR" || exit
+
+if ! git config --get user.name; then
+  echo "Setting git user : ${GIT_USER}"
+  git config --global user.name "${GIT_USER}"
+fi
+
+if ! git config --get user.email; then
+  echo "Setting git email : ${GIT_USER_EMAIL}"
+  git config --global user.email "${GIT_USER_EMAIL}"
+fi