Добавлена поддержка скачивания последней версии скрипта

install_dsync.sh

@@ -1,11 +1,18 @@
 #!/usr/bin/env bash
 # Install dsync from https://git.ai.infran.ru/ilyukhin/dsync.git
 #
+# Behavior:
+# - Fetch latest dsync from repo (git shallow clone or raw download main/master).
+# - Compare VERSION in remote vs locally installed (DEST_PATH).
+#   * If equal and no --force: say "already up to date" and exit 0.
+#   * If remote newer: update.
+#   * If local newer and no --force: warn and exit 1 (avoid accidental downgrade).
+#
 # Usage:
 #   ./install_dsync.sh            # install to ~/.local/bin (default)
 #   ./install_dsync.sh --system   # install to /usr/local/bin (requires sudo)
 #   ./install_dsync.sh -d DIR     # install to custom DIR
-#   ./install_dsync.sh -f         # force overwrite if target exists
+#   ./install_dsync.sh -f         # force overwrite (also allows downgrade/reinstall)
 #   ./install_dsync.sh -h         # show help
 set -euo pipefail
 
@@ -23,12 +30,58 @@ Install dsync from ${REPO_URL}
 Options:
   -s, --system        install into /usr/local/bin (system-wide; may use sudo)
   -d DIR, --dest DIR  install into DIR
-  -f, --force         overwrite existing file without asking
+  -f, --force         overwrite existing file; also bypasses version equality/downgrade checks
   -h, --help          show this help
 EOF
 }
 
-# parse options
+# --- version helpers ----------------------------------------------------------
+
+extract_version() {
+  # Parse VERSION from a dsync file (Python). Prints version or nothing.
+  # Accepts forms like: VERSION = "0.2.1"
+  local f="$1"
+  [[ -f "$f" ]] || { echo ""; return 1; }
+  # get line with VERSION=
+  local line
+  line="$(grep -E '^[[:space:]]*VERSION[[:space:]]*=' "$f" | head -1 || true)"
+  [[ -n "$line" ]] || { echo ""; return 1; }
+  # strip up to '='
+  line="${line#*=}"
+  # trim spaces
+  line="$(echo "$line" | sed -E 's/^[[:space:]]+|[[:space:]]+$//g')"
+  # drop trailing comments
+  line="${line%%#*}"
+  # strip quotes
+  line="${line%\"}"; line="${line#\"}"
+  line="${line%\'}"; line="${line#\'}"
+  # keep only semver-ish chars
+  line="$(echo "$line" | sed -E 's/[^0-9A-Za-z\.\-\+].*$//')"
+  echo "$line"
+}
+
+compare_versions() {
+  # Compare two dotted numeric versions: echoes 1 if $1 > $2, -1 if $1 < $2, 0 if equal.
+  # Non-numeric segments beyond dots are ignored (basic semver compare).
+  local a="$1" b="$2"
+  # fallback: if either empty, consider different
+  [[ -n "$a" && -n "$b" ]] || { [[ "$a" == "$b" ]] && echo 0 || echo 1; return; }
+  IFS=. read -r -a av <<< "$a"
+  IFS=. read -r -a bv <<< "$b"
+  local len="${#av[@]}"
+  (( ${#bv[@]} > len )) && len="${#bv[@]}"
+  local i ai bi
+  for ((i=0;i<len;i++)); do
+    ai="${av[i]:-0}"; bi="${bv[i]:-0}"
+    # force base-10 (avoid octal)
+    if (( 10#$ai > 10#$bi )); then echo 1; return; fi
+    if (( 10#$ai < 10#$bi )); then echo -1; return; fi
+  done
+  echo 0
+}
+
+# --- parse options ------------------------------------------------------------
+
 while [[ $# -gt 0 ]]; do
   case "$1" in
     -s|--system)
@@ -68,13 +121,13 @@ done
 
 DEST_PATH="$DEST_DIR/dsync"
 
-# create temporary dir and ensure cleanup
+# --- prepare dirs -------------------------------------------------------------
+
 TMPDIR="$(mktemp -d)"
 trap 'rm -rf "$TMPDIR"' EXIT
 
 echo "Installing dsync to: $DEST_DIR"
 
-# ensure target directory exists (create with sudo if system dir)
 if [[ ! -d "$DEST_DIR" ]]; then
   echo "Target directory $DEST_DIR does not exist — attempting to create it..."
   if ! mkdir -p "$DEST_DIR" 2>/dev/null; then
@@ -89,29 +142,30 @@ fi
 
 FOUND=""
 
-# 1) Try to clone repo with git (if git available)
+# --- fetch from git (preferred) ----------------------------------------------
+
 if command -v git >/dev/null 2>&1; then
   echo "git found — attempting shallow clone..."
-  if git clone --depth 1 "$REPO_URL" "$TMPDIR/repo" >/dev/null 2>&1; then
+  if git clone --quiet --depth 1 "$REPO_URL" "$TMPDIR/repo" >/dev/null 2>&1; then
     echo "Repository cloned."
   else
     echo "Shallow clone failed, attempting normal clone (may show output)..."
     git clone --depth 1 "$REPO_URL" "$TMPDIR/repo" || true
   fi
-
   if [[ -d "$TMPDIR/repo" ]]; then
+    # try to locate the dsync file
     FOUND="$(find "$TMPDIR/repo" -maxdepth 6 -type f -name dsync -print -quit || true)"
   fi
 fi
 
-# 2) If git did not find the file, try to download raw file via curl (main/master)
+# --- fallback: raw download from main/master ---------------------------------
+
 if [[ -z "$FOUND" ]]; then
   if command -v curl >/dev/null 2>&1; then
     for BR in main master; do
       RAW_URL="$RAW_BASE/$BR/dsync"
       echo "Trying to download raw file: $RAW_URL"
       if curl --fail -L --max-redirs 5 -o "$TMPDIR/dsync" "$RAW_URL"; then
-        # check that downloaded file looks like text/script, not HTML error
         if file "$TMPDIR/dsync" | grep -qE 'text|python|ASCII'; then
           FOUND="$TMPDIR/dsync"
           break
@@ -136,13 +190,47 @@ fi
 
 echo "Found source file at: $FOUND"
 
-# Warn if target exists
+# --- version comparison logic -------------------------------------------------
-if [[ -e "$DEST_PATH" && "$FORCE" -ne 1 ]]; then
+
-  echo "Error: $DEST_PATH already exists. Use --force to overwrite." >&2
+REMOTE_VER="$(extract_version "$FOUND" || true)"
-  exit 1
+LOCAL_VER=""
+if [[ -e "$DEST_PATH" ]]; then
+  LOCAL_VER="$(extract_version "$DEST_PATH" || true)"
 fi
 
-# copy into destination (use sudo if target dir is not writable)
+if [[ "$FORCE" -eq 0 && -e "$DEST_PATH" ]]; then
+  if [[ -n "$REMOTE_VER" && -n "$LOCAL_VER" ]]; then
+    CMP="$(compare_versions "$REMOTE_VER" "$LOCAL_VER")"
+    if [[ "$CMP" -eq 0 ]]; then
+      echo "dsync is already up to date (version $LOCAL_VER). Use --force to reinstall."
+      exit 0
+    elif [[ "$CMP" -lt 0 ]]; then
+      echo "Installed dsync ($LOCAL_VER) is newer than remote ($REMOTE_VER)."
+      echo "Use --force to downgrade or reinstall."
+      exit 1
+    else
+      echo "Updating dsync: $LOCAL_VER -> $REMOTE_VER"
+    fi
+  else
+    echo "Version check inconclusive (remote='$REMOTE_VER', local='$LOCAL_VER')."
+    echo "Proceeding with install (use --force to bypass version checks explicitly)."
+  fi
+elif [[ -e "$DEST_PATH" && "$FORCE" -eq 1 ]]; then
+  if [[ -n "$REMOTE_VER" && -n "$LOCAL_VER" ]]; then
+    echo "Reinstalling (forced): $LOCAL_VER -> $REMOTE_VER"
+  else
+    echo "Reinstalling (forced)."
+  fi
+else
+  if [[ -n "$REMOTE_VER" ]]; then
+    echo "Installing dsync version $REMOTE_VER"
+  else
+    echo "Installing dsync (version unknown)"
+  fi
+fi
+
+# --- install/copy -------------------------------------------------------------
+
 if touch "$DEST_DIR/.write_test" >/dev/null 2>&1; then
   rm -f "$DEST_DIR/.write_test"
   cp -f "$FOUND" "$DEST_PATH"
@@ -159,7 +247,8 @@ else
   echo "Installed (via sudo): $DEST_PATH"
 fi
 
-# quick PATH check
+# --- final PATH hint ----------------------------------------------------------
+
 echo
 echo "PATH check:"
 if command -v dsync >/dev/null 2>&1; then