Option for nearest second comparison on amazon backend

Signed-off-by: Josh Dolitsky <[email protected]>

README.md

@@ -206,7 +206,14 @@ export AWS_SECRET_ACCESS_KEY="spaces_secret_key"
   --storage-amazon-region="us-east-1" \
   --storage-amazon-endpoint="https://fra1.digitaloceanspaces.com"
 ```
-The acces_key and secret_key can be generated from the DigitalOcean console, under the section API/Spaces_access_keys.  
+The access_key and secret_key can be generated from the DigitalOcean console, under the section API/Spaces_access_keys.
+
+Note: on certain S3-based storage backends, the `LastModified` field on objects
+is truncated to the nearest second. For more info, please see issue [#152](https://github.com/helm/chartmuseum/issues/152).
+
+In order to mitigate this, you may use the boolean flag `--storage-amazon-nearestsecond`
+(disabled by default).
+
 
 #### Using with Google Cloud Storage
 Make sure your environment is properly setup to access `my-gcs-bucket`.

cmd/chartmuseum/main.go

@@ -162,6 +162,7 @@ func amazonBackendFromConfig(conf *config.Config) storage.Backend {
 		conf.GetString("storage.amazon.region"),
 		conf.GetString("storage.amazon.endpoint"),
 		conf.GetString("storage.amazon.sse"),
+		conf.GetBool("storage.amazon.nearestsecond"),
 	))
 }
 

go.mod

@@ -1,38 +1,31 @@
 module helm.sh/chartmuseum
 
-go 1.12
+go 1.13
+
+replace (
+	github.com/Azure/go-autorest => github.com/Azure/go-autorest v13.3.2+incompatible
+	github.com/NetEase-Object-Storage/nos-golang-sdk => github.com/karuppiah7890/nos-golang-sdk v0.0.0-20191116042345-0792ba35abcc
+	go.etcd.io/etcd => github.com/eddycjy/etcd v0.5.0-alpha.5.0.20200218102753-4258cdd2efdf
+)
 
 require (
 	github.com/alicebob/gopher-json v0.0.0-20180125190556-5a6b3ba71ee6 // indirect
 	github.com/alicebob/miniredis v2.5.0+incompatible
-	github.com/chartmuseum/auth v0.2.0
-	github.com/chartmuseum/storage v0.5.0
+	github.com/chartmuseum/auth v0.4.0
+	github.com/chartmuseum/storage v0.7.0
 	github.com/ghodss/yaml v1.0.0
-	github.com/gin-contrib/size v0.0.0-20190528085907-355431950c57
-	github.com/gin-gonic/gin v1.4.0
-	github.com/go-redis/redis v6.15.2+incompatible
+	github.com/gin-contrib/size v0.0.0-20191128031627-745aacce0004
+	github.com/gin-gonic/gin v1.5.0
+	github.com/go-redis/redis v6.15.7+incompatible
 	github.com/gofrs/uuid v3.2.0+incompatible
 	github.com/gomodule/redigo v2.0.0+incompatible // indirect
-	github.com/mattn/go-isatty v0.0.10 // indirect
-	github.com/prometheus/client_golang v1.2.1
+	github.com/prometheus/client_golang v1.0.0
 	github.com/sirupsen/logrus v1.4.2
-	github.com/spf13/viper v1.4.0
-	github.com/stretchr/testify v1.4.0
+	github.com/spf13/viper v1.6.2
+	github.com/stretchr/testify v1.5.1
 	github.com/urfave/cli v1.20.0
-	github.com/yuin/gopher-lua v0.0.0-20190514113301-1cd887cd7036 // indirect
-	github.com/zsais/go-gin-prometheus v0.0.0-20181030200533-58963fb32f54
+	github.com/yuin/gopher-lua v0.0.0-20191220021717-ab39c6098bdb // indirect
+	github.com/zsais/go-gin-prometheus v0.1.0
 	go.uber.org/zap v1.10.0
-	golang.org/x/sys v0.0.0-20191206220618-eeba5f6aabab // indirect
-	helm.sh/helm/v3 v3.0.1
-)
-
-replace (
-	github.com/Azure/go-autorest/autorest => github.com/Azure/go-autorest/autorest v0.9.0
-	github.com/docker/docker => github.com/moby/moby v0.7.3-0.20190826074503-38ab9da00309
-	github.com/miekg/dns => github.com/miekg/dns v0.0.0-20181005163659-0d29b283ac0f
-	github.com/ugorji/go => github.com/ugorji/go v1.1.7
-	gopkg.in/inf.v0 v0.9.1 => github.com/go-inf/inf v0.9.1
-	gopkg.in/square/go-jose.v2 v2.3.0 => github.com/square/go-jose v2.3.0+incompatible
-	gopkg.in/yaml.v2 => gopkg.in/yaml.v2 v2.2.7
-	rsc.io/letsencrypt => github.com/dmcgowan/letsencrypt v0.0.0-20160928181947-1847a81d2087
+	helm.sh/helm/v3 v3.1.1
 )