adding mv_gitfile

shell/mv_gitfile.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+#
+# Given a file in a repo, create a series of git patches to import into
+# another repo
+#
+# $1 == name of file (no leading path -- will be checked ./<file>)
+#
+# SPDX-License-Identifier: MIT
+
+RSRC=$1
+PDIR=/tmp/gitmrg
+
+if [ ! -d "${PDIR}" ]; then
+  echo "Creating ${PDIR} ..."
+  mkdir -p "${PDIR}"
+else
+  echo "Cleaning ${PDIR} ..."
+  rm -i "${PDIR}"/*
+fi
+
+if [ ! -f "./${RSRC}" ]; then
+  echo "Bad input - must be in the git directory and name the file"
+  exit 1
+fi
+
+_INIT=$(git rev-list --parents HEAD "${RSRC}" | grep -E "^[a-f0-9]{40}$")
+git format-patch -1 -o "${PDIR}" --start-number 0 "${_INIT}" "${RSRC}"
+git format-patch -o "${PDIR}" --start-number 1 "${_INIT}"..HEAD "${RSRC}"
+
+echo "Next steps:"
+echo " cd /destination/repo"
+echo " git am ${PDIR}/*.patch"
+echo " git push"
+
+exit 0