1 files changed, 47 insertions, 0 deletions
diff --git a/lib/unicorn/worker.rb b/lib/unicorn/worker.rb
new file mode 100644
index 0000000..39e9e32
--- /dev/null
+++ b/lib/unicorn/worker.rb
@@ -0,0 +1,47 @@
+# -*- encoding: binary -*-
+
+# This class and its members can be considered a stable interface
+# and will not change in a backwards-incompatible fashion between
+# releases of \Unicorn.  Knowledge of this class is generally not
+# not needed for most users of \Unicorn.
+#
+# Some users may want to access it in the before_fork/after_fork hooks.
+# See the Unicorn::Configurator RDoc for examples.
+class Unicorn::Worker < Struct.new(:nr, :tmp, :switched)
+
+  # worker objects may be compared to just plain Integers
+  def ==(other_nr) # :nodoc:
+    nr == other_nr
+  end
+
+  # In most cases, you should be using the Unicorn::Configurator#user
+  # directive instead.  This method should only be used if you need
+  # fine-grained control of exactly when you want to change permissions
+  # in your after_fork hooks.
+  #
+  # Changes the worker process to the specified +user+ and +group+
+  # This is only intended to be called from within the worker
+  # process from the +after_fork+ hook.  This should be called in
+  # the +after_fork+ hook after any priviledged functions need to be
+  # run (e.g. to set per-worker CPU affinity, niceness, etc)
+  #
+  # Any and all errors raised within this method will be propagated
+  # directly back to the caller (usually the +after_fork+ hook.
+  # These errors commonly include ArgumentError for specifying an
+  # invalid user/group and Errno::EPERM for insufficient priviledges
+  def user(user, group = nil)
+    # we do not protect the caller, checking Process.euid == 0 is
+    # insufficient because modern systems have fine-grained
+    # capabilities.  Let the caller handle any and all errors.
+    uid = Etc.getpwnam(user).uid
+    gid = Etc.getgrnam(group).gid if group
+    Unicorn::Util.chown_logs(uid, gid)
+    tmp.chown(uid, gid)
+    if gid && Process.egid != gid
+      Process.initgroups(user, gid)
+      Process::GID.change_privilege(gid)
+    end
+    Process.euid != uid and Process::UID.change_privilege(uid)
+    self.switched = true
+  end
+end