merge from cgilite

[confetti] / session_lock.sh

diff --git a/session_lock.sh b/session_lock.sh
new file mode 100644 (file)
index 0000000..de1641a
--- /dev/null
+++ b/session_lock.sh
@@ -0,0 +1,60 @@
+#!/bin/sh
+
+[ "$include_session_lock" ] && return 0
+include_session_lock="$0"
+
+SLOCK(){
+  local file="$1";
+  local timeout="${2-900}"
+  local lockdir="$_DATA/lock/${file#$_DATA}"; lockdir="${lockdir%/}"
+  local ovlock="${lockdir%/*}/delete.${lockdir##*/}"
+  local tempfile="$lockdir/${SESSION_ID}"
+  local lockexpire=$(( $(date +%s) - timeout ))
+
+  mkdir -p "${lockdir%/*}"
+
+  if [ -e "$lockdir" ] \
+     && [ "$(stat -c %Y "$lockdir")" -lt "$lockexpire" ] \
+     && mkdir "$ovlock"; then
+    [ "$(stat -c %Y "$lockdir")" -lt "$lockexpire" ] \
+    && rm -r "$lockdir"
+    rmdir "$ovlock"
+  fi
+
+  printf '%s\n' "$tempfile"
+  if mkdir "$lockdir" 2>&-; then
+    cp "$file" "$tempfile"
+    return 0
+  else
+    return 1
+  fi
+}
+
+CHECK_SLOCK(){
+  local file="$1";
+  local lockdir="$_DATA/lock/${file#$_DATA}"; lockdir="${lockdir%/}"
+  local tempfile="$lockdir/${SESSION_ID}"
+
+  printf '%s\n' "$tempfile"
+  if [ -f "$tempfile" ]; then
+    touch "$lockdir"
+    return 0
+  else
+    return 1
+  fi
+}
+
+RELEASE_SLOCK(){
+  local file="$1";
+  local lockdir="$_DATA/lock/${file#$_DATA}"; lockdir="${lockdir%/}"
+  local ovlock="${lockdir%/*}/delete.${lockdir##*/}"
+  local tempfile="$lockdir/${SESSION_ID}"
+
+  if [ -f "$tempfile" ] && mkdir "$ovlock"; then
+    [ -f "$tempfile" ] && rm -r "$lockdir"
+    rmdir "$ovlock"
+    return 0
+  else
+    return 1
+  fi
+}