How to use Azure DevOps REST API to Update File? - azure-devops

Question

I'm trying to Update a test.json file hosted on a Azure DevOps Repo. I'm using a Logic App. Having trouble identifying the order of operations from the documentation.
I think I need to...
Issue a GET HTTP request to the Items endpoint:
https://dev.azure.com/myOrg/myProject/_apis/git/repositories/myRepoID/items?scopePath=/data/test.json&$format=json&api-version=6.0
Response:
{
"count": 1,
"value": [
{
"objectId": "<longGUID>",
"gitObjectType": "blob",
"commitId": "<longGUID>",
"path": "/data/test.json",
"url": "https://dev.azure.com/myOrg/longGUID/_apis/git/repositories/myRepoID/items?path=%2Fdata%2Ftest.json&versionType=Branch&versionOptions=None"
}
]
}
Use the objectId in the response to issue a POST HTTP request to the Pushes endpoint
Body:
{
"refUpdates": [
{
"name": "refs/heads/main",
"oldObjectId": "<longGuid from previous response>"
}
],
"commits": [
{
"changes": [
{
"changeType": "edit",
"item": {
"path": "/data/test.json"
},
"newContent": {
"content": "CHECK CHECK!",
"contentType": "rawtext"
}
}
],
"comment": "My commit message"
}
]
}
Error:
Status 409 Conflict
{
"$id": "1",
"innerException": null,
"message": "TF401028: The reference 'refs/heads/main' has already been updated by another client, so you cannot update it. Please try again.",
"typeName": "Microsoft.TeamFoundation.Git.Server.GitReferenceStaleException, Microsoft.TeamFoundation.Git.Server",
"typeKey": "GitReferenceStaleException",
"errorCode": 0,
"eventId": 3000
}
Questions:
Am I correct on the order of operations?
How do I overcome this issue?
FIX: (Thank you #Leo_Liu-MSFT)
GET request to https://dev.azure.com/myOrg/myProject/_apis/git/repositories/repoID/commits?searchCriteria.$top=1&searchCriteria.itemVersion.version=main&api-version=6.0
POST request to https://dev.azure.com/myOrg/myProject/_apis/git/repositories/repoID/pushes
Body:
{
"commits": [
{
"changes": [
{
"changeType": "edit",
"item": {
"path": "<Your File To Update>"
},
"newContent": {
"content": "CHECK CHECK!",
"contentType": "rawtext"
}
}
],
"comment": "<YOUR COMMIT MSG>"
}
],
"refUpdates": [
{
"name": "refs/heads/main",
"oldObjectId": "<commitId from previous response>"
}
]
}

Answer 1

How to use Azure DevOps REST API to Update File?
The oldObjectId in the request body is not the value of the objectId.
It should be the the latest commit SHA for the branch main.
Go to the code page > Files
Choose a repository and branch
Select the root level (repository name) > History
Click … of the first commit > Copy full SHA
And the value should be create a new branch 0000000000000000000000000000000000000000 when used to create a new branch.