fpga/lib: Add subtree manager for psmake

Signed-off-by: Joachim Foerster <joachim.foerster@missinglinkelectronics.com>

fpga/lib/update-psmake.sh

@@ -0,0 +1,118 @@
+#!/bin/bash
+
+# Git subtree manager
+# Alex Forencich <alex@alexforencich.com>
+# This script facilitates easy management of subtrees
+# included in larger repositories as this script can
+# be included in the repository itself.
+
+# Settings
+# uncomment to use --squash
+squash="yes"
+# Remote repository
+repo="https://github.com/missinglinkelectronics/psmake.git"
+# Remote name
+remote="psmake"
+# Subdirectory to store code in
+# (relative to repo root or to script location)
+#subdir="psmake"
+rel_subdir="psmake"
+# Remote branch
+branch="master"
+# Backport branch name (only used for pushing)
+backportbranch="${remote}backport"
+# Add commit message
+addmsg="added ${remote} as a subproject"
+# Merge commit message
+mergemsg="merged changes in ${remote}"
+
+# Usage
+# add - adds subtree
+# pull - default, pulls from remote
+# push - pushes to remote
+
+# determine repo absolute path
+if [ -n "$rel_subdir" ]; then
+    # cd to script dir
+    SOURCE="${BASH_SOURCE[0]}"
+    while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
+      DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+      SOURCE="$(readlink "$SOURCE")"
+      [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
+    done
+    DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+
+    cd "$DIR"
+
+    # relative path to script dir
+    git-absolute-path () {
+        fullpath=$(readlink -f "$1")
+        gitroot="$(git rev-parse --show-toplevel)" || return 1
+        [[ "$fullpath" =~ "$gitroot" ]] && echo "${fullpath/$gitroot\//}"
+    }
+
+    subdir="$(git-absolute-path .)/$rel_subdir"
+fi
+
+squashflag=""
+
+cd $(git rev-parse --show-toplevel)
+
+if [ $squash ]; then
+    squashflag="--squash"
+fi
+
+action="pull"
+
+if [ ! -d "$subdir" ]; then
+    action="add"
+fi
+
+if [ -n "$1" ]; then
+    action="$1"
+fi
+
+# array contains value
+# usage: contains array value
+function contains() {
+    local n=$#
+    local value=${!n}
+    for ((i=1;i < $n;i++)) {
+        if [ "${!i}" == "${value}" ]; then
+            echo "y"
+            return 0
+        fi
+    }
+    echo "n"
+    return 1
+}
+
+case "$action" in
+  add)
+    if [ $(contains $(git remote) "$remote") != "y" ]; then
+      git remote add "$remote" "$repo"
+    fi
+    git fetch "$remote"
+    git subtree add -P "$subdir" $squashflag -m "$addmsg" "$remote/$branch"
+    ;;
+  pull)
+    if [ $(contains $(git remote) "$remote") != "y" ]; then
+      git remote add "$remote" "$repo"
+    fi
+    git fetch "$remote"
+    git subtree merge -P "$subdir" $squashflag -m "$mergemsg" "$remote/$branch"
+    ;;
+  push)
+    if [ $(contains $(git remote) "$remote") != "y" ]; then
+      git remote add "$remote" "$repo"
+    fi
+    git subtree split -P "$subdir" -b "$backportbranch"
+    git push "$remote" "$backportbranch:$branch"
+    ;;
+  *)
+    echo "Error: unknown action!"
+    exit 1
+esac
+
+exit 0
+