added docker_show_tags.sh

docker_show_tags.sh

@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+#  vim:ts=4:sts=4:sw=4:et
+#  args: https://hub.docker.com/v2/repositories/library/centos
+#
+#  Author: Hari Sekhon
+#  Date: 2020-09-30 11:08:01 +0100 (Wed, 30 Sep 2020)
+#
+#  https://github.com/HariSekhon/bash-tools
+#
+#  License: see accompanying Hari Sekhon LICENSE file
+#
+#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
+#
+#  https://www.linkedin.com/in/HariSekhon
+#
+
+set -euo pipefail
+[ -n "${DEBUG:-}" ] && set -x
+srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# shellcheck disable=SC1090
+. "$srcdir/lib/utils.sh"
+
+# shellcheck disable=SC2034,SC2154
+usage_description="
+Lists tags for a given Docker Registry image using the Docker Registry API
+
+Example:
+
+Official images must be prefixed with 'library/':
+
+    ${0##*/} https://hub.docker.com/v2/repositories/library/centos
+
+    ${0##*/} https://hub.docker.com/v2/repositories/library/ubuntu
+
+User images are prefixed with '<username>/':
+
+    ${0##*/} https://hub.docker.com/v2/repositories/harisekhon/hbase
+
+
+See also:
+
+- dockerhub_show_tags.sh:
+
+    ddockerhub_show_tags.sh harisekhon/hbase
+
+- Skopeo:
+
+    skopeo inspect docker://harisekhon/hbase | jq -r '.RepoTags[]'
+"
+
+# used by usage() in lib/utils.sh
+# shellcheck disable=SC2034
+usage_args="https://host:port/v2/repository/<repo>/<image> [<curl_options>]"
+
+help_usage "$@"
+
+min_args 1 "$@"
+
+url="$1"
+shift || :
+
+get_tags(){
+    local url="$1"
+    local output
+    shift || :
+    output="$("$srcdir/docker_api.sh" "$url" "$@")"
+    tags="$(jq -r '.results[].name' <<< "$output")"
+    if [ -z "$tags" ]; then
+        die "no tags returned for url '$url'"
+    fi
+    echo "$tags"
+    next="$(jq -r .next <<< "$output")"
+    if [ -n "$next" ] && [ "$next" != null ]; then
+        get_tags "$next"
+    fi
+}
+
+get_tags "$url/tags" "$@"