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Returns more than one additional image store #2096

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Returns more than one additional image store #2096

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7 changes: 5 additions & 2 deletions types/options.go
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Original file line number Diff line number Diff line change
Expand Up @@ -457,8 +457,11 @@ func ReloadConfigurationFile(configFile string, storeOptions *StoreOptions) erro
if config.Storage.RootlessStoragePath != "" {
storeOptions.RootlessStoragePath = config.Storage.RootlessStoragePath
}
for _, s := range config.Storage.Options.AdditionalImageStores {
storeOptions.GraphDriverOptions = append(storeOptions.GraphDriverOptions, fmt.Sprintf("%s.imagestore=%s", config.Storage.Driver, s))
if len(config.Storage.Options.AdditionalImageStores) > 0 {
imageStore := config.Storage.Options.AdditionalImageStores[0]
additionalImageStores := strings.Join(config.Storage.Options.AdditionalImageStores, ",")
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I'm not opposed to this way of doing things, but I think it'd be conceptually cleaner to add a new API field that was an array/list.

Squashing an array to a string like this comma-separated raises questions around e.g. "what happens if the store path has a comma in it" - to be clear not something that really we'd expect to happen in this case.

But as a general case these things can happen, and ad-hoc "stringification" can become a problem.

There's also the flip side in that in theory something could have been reading the prior field and relying on it only containing (the top?) store, and suddenly seeing multiple paths there would break a prior consumer.

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this can be specified multiple times, e.g. podman --storage-opt overlay.additionalimagestore=/tmp/1 --storage-opt overlay.additionalimagestore=/tmp/2 ... works fine.

So instead of combining multiple additional image stores in a single option, we can have multiple additionalimagestore, one for each directory.

Said so, we don't currently support commas in the path, as we have an explicit strings.Split(val, ",") in overlay.go.

storeOptions.GraphDriverOptions = append(storeOptions.GraphDriverOptions, fmt.Sprintf("%s.imagestore=%s", config.Storage.Driver, imageStore))
storeOptions.GraphDriverOptions = append(storeOptions.GraphDriverOptions, fmt.Sprintf("%s.additionalimagestores=%s", config.Storage.Driver, additionalImageStores))
Comment on lines +463 to +464
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I can’t see any parser of a driver additionalimagestores option; AFAICS that just doesn’t work.

All entries in Options.AdditionalImageStores have the same semantics (and that’s different from Options.ImageStore). I don’t know why we would treat the first item differently.

I especially don’t know why we would now add the first item twice.

Also, if you look at the drivers’ option parsers, for the overlay driver both option names are treated the same, but for VFS, additionalimagestore is not recognized at all. So this breaks VFS.

}
for _, s := range config.Storage.Options.AdditionalLayerStores {
storeOptions.GraphDriverOptions = append(storeOptions.GraphDriverOptions, fmt.Sprintf("%s.additionallayerstore=%s", config.Storage.Driver, s))
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57 changes: 48 additions & 9 deletions types/options_test.go
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Expand Up @@ -125,13 +125,52 @@ func TestGetRootlessStorageOpts2(t *testing.T) {
}

func TestReloadConfigurationFile(t *testing.T) {
content := bytes.NewBufferString("")
logrus.SetOutput(content)
var storageOpts StoreOptions
err := ReloadConfigurationFile("./storage_broken.conf", &storageOpts)
require.NoError(t, err)
assert.Equal(t, storageOpts.RunRoot, "/run/containers/test")
logrus.SetOutput(os.Stderr)

assert.Equal(t, strings.Contains(content.String(), "Failed to decode the keys [\\\"foo\\\" \\\"storage.options.graphroot\\\"] from \\\"./storage_broken.conf\\\"\""), true)
t.Run("broken", func(t *testing.T) {
content := bytes.NewBufferString("")
logrus.SetOutput(content)
var storageOpts StoreOptions
err := ReloadConfigurationFile("./storage_broken.conf", &storageOpts)
require.NoError(t, err)
assert.Equal(t, storageOpts.RunRoot, "/run/containers/test")
logrus.SetOutput(os.Stderr)
assert.Equal(t, strings.Contains(content.String(), "Failed to decode the keys [\\\"foo\\\" \\\"storage.options.graphroot\\\"] from \\\"./storage_broken.conf\\\"\""), true)
})
t.Run("imagestore-empty", func(t *testing.T) {
expectedStore := ""
expectedAdditionalStores := ""
var storageOpts StoreOptions
err := ReloadConfigurationFile("./storage_test.conf", &storageOpts)
require.NoError(t, err)
var actualStore, actualAdditionalStores string
for _, o := range storageOpts.GraphDriverOptions {
option := strings.Split(o, "=")
switch option[0] {
case storageOpts.GraphDriverName + ".imagestore":
actualStore = option[1]
case storageOpts.GraphDriverName + ".additionalimagestores":
actualAdditionalStores = option[1]
}
}
assert.Equal(t, actualStore, expectedStore)
assert.Equal(t, actualAdditionalStores, expectedAdditionalStores)
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(The parameter order is (t, expected, actual).)

})
t.Run("imagestore-many", func(t *testing.T) {
expectedStore := "/var/lib/containers/storage1"
expectedAdditionalStores := "/var/lib/containers/storage1,/var/lib/containers/storage2"
var storageOpts StoreOptions
err := ReloadConfigurationFile("./storage_imagestores_test.conf", &storageOpts)
require.NoError(t, err)
var actualStore, actualAdditionalStores string
for _, o := range storageOpts.GraphDriverOptions {
option := strings.Split(o, "=")
switch option[0] {
case storageOpts.GraphDriverName + ".imagestore":
actualStore = option[1]
case storageOpts.GraphDriverName + ".additionalimagestores":
actualAdditionalStores = option[1]
}
}
assert.Equal(t, actualStore, expectedStore)
assert.Equal(t, actualAdditionalStores, expectedAdditionalStores)
})
}
5 changes: 5 additions & 0 deletions types/storage_imagestores_test.conf
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
[storage.options]
additionalimagestores = [
"/var/lib/containers/storage1",
"/var/lib/containers/storage2"
]