检查docker hub上是否已存在image:tag组合

作为bash脚本的一部分,我想检查docker hub上是否存在特别的docker image:tag组合。同样,它将是一个私有存储库。

即伪代码将是这样的:

tag = something

if image:tag already exists on docker hub:

Do nothing

else

Build and push docker image with that tag

回答:

请试试这个

function docker_tag_exists() {

curl --silent -f -lSL https://index.docker.io/v1/repositories/$1/tags/$2 > /dev/null

}

if docker_tag_exists library/nginx 1.7.5; then

echo exist

else

echo not exists

fi


更新:

如果使用Docker Registry

v2(基于此):

# set username and password

UNAME="user"

UPASS="password"

function docker_tag_exists() {

TOKEN=$(curl -s -H "Content-Type: application/json" -X POST -d '{"username": "'${UNAME}'", "password": "'${UPASS}'"}' https://hub.docker.com/v2/users/login/ | jq -r .token)

EXISTS=$(curl -s -H "Authorization: JWT ${TOKEN}" https://hub.docker.com/v2/repositories/$1/tags/?page_size=10000 | jq -r "[.results | .[] | .name == \"$2\"] | any")

test $EXISTS = true

}

if docker_tag_exists library/nginx 1.7.5; then

echo exist

else

echo not exists

fi

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