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Get the hash of the last commit or create a new empty commit using a bitbucket API

Edited

Hello people, my question now is: I created a * sh to create a tag in another repository (weird thing I need more for my business rule to work in gcp) I'm doing this via the bitbucket api, only to create the precise hash tag for a commit from this repository, so far ok! But what I did is working, but of course it's not done well, but that's what I got for now.

#!/usr/bin/env bash

# Exit immediately if a any command exits with a non-zero status
set -e

# Set variables
REPOSITORY=$1
echo "Get Last Commit"
curl https://api.bitbucket.org/2.0/repositories/$BITBUCKET_REPO_OWNER/$REPOSITORY/commits/?pagelen=1 \  
-u 
$BITBUCKET_USERNAME:$BITBUCKET_APP_PASSWORD_MASTER \
sed 's/{"pagelen.*, "hash//' arq1.hash > arq2.hash
grep -i "" arq2.hash | awk '{print $2}' > arq3.hash
sed 's/"//g' arq3.hash > arq4.hash
sed 's/,//g' arq4.hash > arq5.hash
LAST_COMMIT_HASH=$(cat arq5.hash)
rm -f arq*.hash
echo "Last Commit: " $LAST_COMMIT_HASH

# Create new tag
echo "Creating Tag"
curl (-)X POST https://api.bitbucket.org/2.0/repositories/$BITBUCKET_REPO_OWNER/$REPOSITORY/refs/tags \
(-u $BITBUCKET_USERNAME:$BITBUCKET_APP_PASSWORD_MASTER \
--fail --show-error --silent \
-H 'Content-Type: application/json' \  
-d 
'{      
"name": 
"release_
'$BITBUCKET_BUILD_NUMBER'",
        "target": { 
               "hash": "
'$LAST_COMMIT_HASH'"
      }
  }'

What I would like to know is if it is possible through the API to rescue the hash of the last commit from the master of a repository OR if I can create an empty commit (git commit --allow-empty) through the api and in return get this hash? !

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