Adds dockerfile_image_tag.sh tool to tag docker image ids in git.

tools/dockerfile_image_tag.sh

@@ -0,0 +1,118 @@
+#!/bin/bash
+
+### Find the latest docker image id and tag it in git
+### Usage:
+###   ./dockerfile_image_tag.sh DOCKER_ORG DOCKER_REPO DOCKER_TAG
+### Example:
+###   ./dockerfile_image_tag.sh lbry lbrycrd linux-x86_64-production
+
+exe() { ( echo "## $*"; $*; ) }
+
+SCRIPT_NAME=$0
+SCRIPT_PATH="$( cd "$(dirname "$0")" && pwd -P )"
+GIT_PATH="$(dirname "$SCRIPT_PATH")"
+GIT_REMOTE=${GIT_REMOTE:-origin}
+
+if ! which jq > /dev/null; then
+    echo "You need to install jq - https://stedolan.github.io/jq/"
+    exit 1
+fi
+
+if ! which curl > /dev/null; then
+    echo "You need to install curl"
+    exit 1
+fi
+
+get_docker_tags() {
+    # Thank you minamijoyo - https://stackoverflow.com/a/41830007/56560
+    if [ "$#" -ne 3 ]; then
+        echo "Wrong args: get_docker_tags DOCKER_ORG DOCKER_REPO DOCKER_TAG"
+    fi
+
+    ORG=$1
+    REPOSITORY=$2
+    TARGET_TAG=$3
+
+    echo "Contacting docker hub ..." >&2
+    # get authorization token
+    TOKEN=$(curl -s "https://auth.docker.io/token?service=registry.docker.io&scope=repository:$ORG/$REPOSITORY:pull" | jq -r .token)
+
+    # find all tags
+    ALL_TAGS=$(curl -s -H "Authorization: Bearer $TOKEN" https://index.docker.io/v2/$ORG/$REPOSITORY/tags/list | jq -r .tags[])
+
+    # get image digest for target
+    TARGET_DIGEST=$(curl -s -D - -H "Authorization: Bearer $TOKEN" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" https://index.docker.io/v2/$ORG/$REPOSITORY/manifests/$TARGET_TAG | grep Docker-Content-Digest | cut -d ' ' -f 2)
+
+    # for each tags
+    for tag in ${ALL_TAGS[@]}; do
+        # get image digest
+        digest=$( curl -s -D - -H "Authorization: Bearer $TOKEN" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" https://index.docker.io/v2/$ORG/$REPOSITORY/manifests/$tag | grep Docker-Content-Digest | cut -d ' ' -f 2)
+
+        # check digest
+        if [[ $TARGET_DIGEST = $digest ]]; then
+            # Echo to stderr to be helpful to humans:
+            echo "$ORG/$REPOSITORY:$tag $digest" >&2
+            # Echo to stdout to use as a script:
+            echo $digest
+        fi
+    done
+}
+
+check_git_status(){
+    # Check if the git stage is clear, on master branch, and up to date with the remote.
+    (
+        set -e
+        echo "Checking git status ..."
+        cd $GIT_PATH
+        if [[ $(git branch --show-current) != "master" ]]; then
+            echo "You are not on the master branch."
+            echo "Please change to the master branch before running this."
+            exit 1
+        fi
+        if ! git remote show origin | grep -e "^\W*master .*\(up to date\)" > /dev/null; then
+            echo "Your local branch is behind in the history of the remote"
+            echo "Please do a git pull before running this."
+            exit 1
+        fi
+        if git status --porcelain | grep -e "^A " > /dev/null; then
+            git status
+            echo "You have staged files for commit in git: $GIT_PATH"
+            echo "Please stash or commit those changes before running this. "
+            exit 1
+        fi
+    )
+}
+
+main() {
+    if [ "$#" -ne 3 ]; then
+        echo "run: $SCRIPT_NAME DOCKER_ORG DOCKER_REPO DOCKER_TAG"
+        echo "eg : $SCRIPT_NAME lbry lbrycrd linux-x86_64-production"
+        exit 1
+    fi
+    DOCKER_ORG=$1 DOCKER_REPO=$2; DOCKER_TAG=$3
+
+    # Check if the git stage is clear, error if not:
+    check_git_status
+
+    # Get the current Docker tag id and sanity check:
+    CURRENT_IMAGE_ID=$(get_docker_tags $DOCKER_ORG $DOCKER_REPO $DOCKER_TAG | cut -d ':' -f 2 | sed 's/\r$//g')
+    echo "CURRENT_IMAGE_ID=$CURRENT_IMAGE_ID"
+    if ! (echo $CURRENT_IMAGE_ID | grep -e "^[A-Fa-f0-9]\{64\}$" > /dev/null); then
+        echo "Bad image id: $CURRENT_IMAGE_ID"
+        echo -n $CURRENT_IMAGE_ID | hexdump -C
+        exit 1
+    fi
+
+    # Tag the current git HEAD with the docker image id:
+    GIT_COMMIT=$(git -C $GIT_PATH rev-parse HEAD)
+    GIT_TAG=$DOCKER_ORG-$DOCKER_REPO-$DOCKER_TAG-$CURRENT_IMAGE_ID
+    echo "GIT_COMMIT=$GIT_COMMIT"
+    echo "GIT_TAG=$GIT_TAG"
+    git -C $GIT_PATH tag $GIT_TAG $GIT_COMMIT && \
+        echo "Pushing tags to $GIT_REMOTE ..." && \
+        (git push --tags --dry-run 2>&1 | grep "\[new tag\]") && \
+        git -C $GIT_PATH push --tags $GIT_REMOTE
+}
+
+main $*
+