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Local GitHub repository backups with Powershell
param(
[Parameter(Mandatory=$true)]
[string]$Username,
[Parameter(Mandatory=$true)]
[string]$GitHubAccessToken,
[Parameter(Mandatory=$true)]
[string]$BackupFolderPath
)
$initialWorkingPath = Convert-Path '.'
# Create the authorisation headers using our access token
$bytes = [System.Text.Encoding]::UTF8.GetBytes("${Username}:${GitHubAccessToken}")
$base64Credentials =[Convert]::ToBase64String($Bytes)
$authorization = "Basic $base64Credentials"
$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
$headers.Add("content-type", "application/json")
$headers.Add("Authorization", $authorization)
# This is the GraphQL query, which gets us the first
# 100 repos belonging to the specified username
$graphql = @"
query {
user(login:"$Username") {
repositories(first:100) {
nodes { name url }
}
}
}
"@
# We're going to wrap the GraphQL query in JSON, so
# we need to escape it accordingly.
# However, ConvertTo-Json converts newlines to \r\n,
# which the API endpoints fail to parse...
# https://developer.github.com/v4/guides/forming-calls/#communicating-with-graphql
# So, first we remove newlines and multiple spaces
$queryJson = $graphql `
-replace "[\r\n]+", " " `
-replace "\s{2,}", " "
# The API request body is a JSON wrapper, with a
# 'query' property containing the actual query
$body = '{ "query": ' + (ConvertTo-Json $queryJson) + '}'
function Write-Divider {
Write-Host "-----------------------------------------"
}
try {
$response = Invoke-WebRequest `
-Uri 'https://api.github.com/graphql' `
-Method POST `
-Headers $headers `
-Body $body
$responseJson = (ConvertFrom-Json $response)
$repos = $responseJson.data.user.repositories.nodes
$repos | ForEach {
$name = $_.name
$mirrorPath = "$BackupFolderPath\$name.git"
# Check if the repository already exists; if it does,
# we'll need to call a different git command
$exists = Test-Path -Path $mirrorPath
Write-Host ""
if ($exists) {
"Updating $name"
Write-Divider
cd $mirrorPath
git remote update
Write-Divider
} else {
"Cloning $name"
Write-Divider
cd $BackupFolderPath
git clone $_.url --mirror
Write-Divider
}
}
} finally {
# We've been cd'ing about all over the place,
# so go back to where we started
cd $initialWorkingPath
}
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