added facts couchdb_version and couchdb_pwhash_alg

couchdb v1.3 changed the default pw hashing algorithm from
sha1 to pbkdf2, see http://docs.couchdb.org/en/1.4.x/configuring.html
the "couchdb_pwhash_alg" fact shows the currently used algorithm
by checking the "couchdb_version" fact.

2 files changed, 77 insertions, 0 deletions

diff --git a/lib/facter/couchdb_pwhash_alg.rb b/lib/facter/couchdb_pwhash_alg.rb
new file mode 100644
index 0000000..42b96b7
--- /dev/null
+++ b/lib/facter/couchdb_pwhash_alg.rb
@@ -0,0 +1,43 @@
+require 'facter'
+
+def version_parts ( version )
+  # gives back a hash containing major, minor and patch numbers
+  # of a give version string
+
+  parts = Hash.new
+  first, *rest = version.split(".")
+  parts["major"] = first
+  parts["minor"] = rest[0]
+  parts["patch"] = rest[1]
+  return parts
+end
+
+def couchdb_pwhash_alg
+  # couchdb uses sha1 as pw hash algorithm until v. 1.2,
+  # but pbkdf2 from v.1.3 on.
+  # see http://docs.couchdb.org/en/1.4.x/configuring.html for
+  # details
+
+  couchdb_version = Facter.value(:couchdb_version)
+  version = version_parts (couchdb_version)
+  major = version["major"].to_i
+  alg = case major
+    when 0 then alg = 'n/a'
+    when 1 then
+      minor = version['minor'].to_i
+      if minor < 3
+        alg = 'sha1'
+      else
+        alg = 'pbkdf2'
+      end
+  else
+    alg = 'pbkdf2'
+  end
+  return alg
+end
+
+Facter.add(:couchdb_pwhash_alg) do
+  setcode do
+    couchdb_pwhash_alg
+  end
+end
diff --git a/lib/facter/couchdb_version.rb b/lib/facter/couchdb_version.rb
new file mode 100644
index 0000000..3a72116
--- /dev/null
+++ b/lib/facter/couchdb_version.rb
@@ -0,0 +1,34 @@
+require 'facter'
+
+def deb_installed_version ( name )
+  # returns an empty string if package is not installed,
+  # otherwise the version
+
+  version = `apt-cache policy #{name} | grep Installed 2>&1`
+  version.slice! "  Installed: "
+  version.slice! "(none)"
+  return version.strip.chomp
+end
+
+def couchdb_version
+  bigcouch = deb_installed_version("bigcouch")
+  if bigcouch.empty?
+    couchdb = deb_installed_version("couchdb")
+    if couchdb.empty?
+      version = 'n/a'
+    else
+      version =  couchdb
+    end
+  else
+    # bigcouch is currently only available in one version (0.4.2),
+    # which includes couchdb 1.1.1
+    version = '1.1.1'
+  end
+  return version
+end
+
+Facter.add(:couchdb_version) do
+  setcode do
+    couchdb_version
+  end
+end