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Add name-generation test

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Podman's container-name generation depends on the global RNG state being
properly initialized (seeded).  Should this not happen for some reason
(or it's seeded with a static value), podman will generate the exact
same repeating sequence of container names (assuming no clashes with
existing containers).  Add a test to confirm this is always the case.

Signed-off-by: Chris Evich <cevich@redhat.com>
This commit is contained in:
Chris Evich
2023-04-27 14:39:51 -04:00
parent 19152fa349
commit e8f34e4579
1 changed files with 30 additions and 0 deletions
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30
test/e2e/run_test.go
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@ -48,6 +48,36 @@ var _ = Describe("Podman run", func() {
Expect(session).Should(Exit(0))
})
// This test may seem entirely pointless, it is not. Due to compatibility
// and historical reasons, the container name generator uses a globally
// scoped RNG, seeded from a global state. An easy way to check if its
// been initialized properly (i.e. pseudo-non-deterministically) is
// checking if the name-generator spits out the same name twice. Because
// existing containers are checked when generating names, the test must ensure
// the first container is removed before creating a second.
It("podman generates different names for successive containers", func() {
var names [2]string
for i := range names {
session := podmanTest.Podman([]string{"create", ALPINE, "true"})
session.WaitWithDefaultTimeout()
Expect(session).Should(Exit(0))
cid := session.OutputToString()
Expect(cid).To(Not(Equal("")))
session = podmanTest.Podman([]string{"container", "inspect", "--format", "{{.Name}}", cid})
session.WaitWithDefaultTimeout()
Expect(session).Should(Exit(0))
names[i] = session.OutputToString()
Expect(names[i]).To(Not(Equal("")))
session = podmanTest.Podman([]string{"rm", cid})
session.WaitWithDefaultTimeout()
Expect(session).Should(Exit(0))
}
Expect(names[0]).ToNot(Equal(names[1]), "Podman generated duplicate successive container names, has the global RNG been seeded correctly?")
})
It("podman run check /run/.containerenv", func() {
session := podmanTest.Podman([]string{"run", ALPINE, "cat", "/run/.containerenv"})
session.WaitWithDefaultTimeout()