Should images with different tags have different digests? #1811
Description
Hello,
How digests for manifests are generated? I tagged the same image with three different tags and pushed them into 2.4.1 registry. Two of then have identical digests while third one is different. Is it supposed behavior? I know that in the older versions of registry digests were different for all tags, but I am not sure at what version this behavior changed.
-bash-4.2$ curl http://localhost:5000/v2/dubros/test/tags/list
{"name":"dubros/test","tags":["latest","t1","t2"]}
-bash-4.2$ curl --header "Accept: application/vnd.docker.distribution.manifest.v2+json" -I -X HEAD localhost:5000/v2/dubros/test/manifests/latest 2>/dev/null | grep Docker-Content-Digest | awk '{print $2}'
sha256:0a88770e824e5b7bcd15eec6da32f22e6d4e84c1fef9a5cdc5bbafd8917f9c31
-bash-4.2$ curl --header "Accept: application/vnd.docker.distribution.manifest.v2+json" -I -X HEAD localhost:5000/v2/dubros/test/manifests/t1 2>/dev/null | grep Docker-Content-Digest | awk '{print $2}'
sha256:2e1a1a37978fae1d0fa6aff2aada9a512d5c811eea9d5a174b8610744db6b103
-bash-4.2$ curl --header "Accept: application/vnd.docker.distribution.manifest.v2+json" -I -X HEAD localhost:5000/v2/dubros/test/manifests/t2 2>/dev/null | grep Docker-Content-Digest | awk '{print $2}'
sha256:2e1a1a37978fae1d0fa6aff2aada9a512d5c811eea9d5a174b8610744db6b103
-bash-4.2$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
localhost:5000/dubros/test latest 1feba5a478fe 9 months ago 204.9 MB
localhost:5000/dubros/test t1 1feba5a478fe 9 months ago 204.9 MB
localhost:5000/dubros/test t2 1feba5a478fe 9 months ago 204.9 MB
qa.registry.docker.site.gs.com/gs_cloud/httpd latest 1feba5a478fe 9 months ago 204.9 MB