Site promotion tools

sync/promote-file.sh

@@ -0,0 +1,78 @@
+#!/bin/sh
+set -eu
+
+if [ "$#" -lt 2 ] || [ "$#" -gt 3 ]; then
+  echo "usage: $0 <source> <destination> [metadata-source]" >&2
+  exit 64
+fi
+
+src="$1"
+dst="$2"
+metadata_source=${3:-}
+dst_dir=$(dirname "$dst")
+dst_name=$(basename "$dst")
+dst_ext=""
+
+case "$dst_name" in
+  *.*)
+    dst_ext=${dst_name##*.}
+    ;;
+esac
+
+test -f "$src" || {
+  echo "source file not found: $src" >&2
+  exit 66
+}
+
+owner=""
+group=""
+mode=""
+sample=""
+
+if [ -e "$dst" ]; then
+  owner=$(stat -f '%Su' "$dst")
+  group=$(stat -f '%Sg' "$dst")
+  mode=$(stat -f '%Lp' "$dst")
+else
+  if [ -n "$metadata_source" ]; then
+    test -e "$metadata_source" || {
+      echo "metadata source not found: $metadata_source" >&2
+      exit 66
+    }
+    sample=$metadata_source
+  elif [ -n "$dst_ext" ]; then
+    for candidate in "$dst_dir"/*."$dst_ext"; do
+      [ -e "$candidate" ] || continue
+      sample=$candidate
+      break
+    done
+  fi
+
+  if [ -z "$sample" ]; then
+    for candidate in "$dst_dir"/*; do
+      [ -f "$candidate" ] || continue
+      sample=$candidate
+      break
+    done
+  fi
+
+  if [ -n "$sample" ]; then
+    owner=$(stat -f '%Su' "$sample")
+    group=$(stat -f '%Sg' "$sample")
+    mode=$(stat -f '%Lp' "$sample")
+  else
+    owner=$(stat -f '%Su' "$dst_dir")
+    group=$(stat -f '%Sg' "$dst_dir")
+    mode=644
+  fi
+fi
+
+cp "$src" "$dst"
+chown "$owner":"$group" "$dst"
+chmod "$mode" "$dst"
+
+printf 'copied %s -> %s\n' "$src" "$dst"
+printf 'restored owner=%s group=%s mode=%s\n' "$owner" "$group" "$mode"
+if [ -n "$sample" ]; then
+  printf 'metadata source=%s\n' "$sample"
+fi