environs: read series from /etc/lsb-release

environs/tools_test.go

 package environs_test
 
 import (
         "fmt"
         "io/ioutil"
         . "launchpad.net/gocheck"
         "launchpad.net/juju/go/environs"
         "launchpad.net/juju/go/environs/dummy"
         "launchpad.net/juju/go/version"
         "net/http"
@@ skipping 216 matching lines @@
                         c.Assert(err, IsNil)
                         resp, err := http.Get(url)
                         c.Assert(err, IsNil)
                         data, err := ioutil.ReadAll(resp.Body)
                         c.Assert(err, IsNil)
                         c.Assert(string(data), Equals, tt.expect, Commentf("url %s", url))
                 }
                 t.env.Destroy(nil)
         }
 }
+
+var readSeriesTests = []struct {
+        contents string
+        series   string
+}{{
+        `DISTRIB_ID=Ubuntu
+DISTRIB_RELEASE=12.04
+DISTRIB_CODENAME=precise
+DISTRIB_DESCRIPTION="Ubuntu 12.04 LTS"`,
+        "precise",
+}, {
+        "DISTRIB_CODENAME=\tprecise\t",
+        "precise",
+}, {
+        `DISTRIB_ID=Ubuntu
+DISTRIB_RELEASE=12.10
+DISTRIB_CODENAME=quantal
+DISTRIB_DESCRIPTION="Ubuntu 12.10"`,
+        "quantal",
+}, {
+        "",
+        "unknownSeries",
+},
+}
+
+func (t *ToolsSuite) TestReadSeries(c *C) {
+        d := c.MkDir()
+        f := filepath.Join(d, "foo")
+        for i, t := range readSeriesTests {
+                c.Logf("test %d", i)
+                err := ioutil.WriteFile(f, []byte(t.contents), 0666)
+                c.Assert(err, IsNil)
+                c.Assert(environs.ReadSeries(f), Equals, t.series)
+        }
+}
+
+func (t *ToolsSuite) TestCurrentSeries(c *C) {
+        s := environs.CurrentSeries
+        if s == "unknownSeries" {
+                s = "n/a"

[niemeyer, 2012/05/29 12:28:41]

Huh.. why!?

+        }
+        out, err := exec.Command("lsb_release", "-c").CombinedOutput()
+        if err != nil {
+                c.Assert(s, Equals, "n/a")
+        } else {
+                c.Assert(string(out), Equals, "Codename:\t"+s+"\n")
+        }
+}