Get-GitRepositorySize.ps1

[CmdletBinding()]
Param (
    [string] $RepositoryPath = '.'
)


function Split-GitPath ([string] $path) {
    $pos = $path.LastIndexOf('/')
    if ($pos -eq -1) {
        ''
    } else {
        $path.Substring(0, $pos)
    }
}

$RepositoryPath = Resolve-Path $RepositoryPath

pushd .
cd $RepositoryPath

$objects_map = @{}
Write-Progress -Activity 'Scanning GIT objects'
@(git rev-list --objects --all) | %{ if ($_ -match '^(\w+)(?: (.*))?$') { $objects_map.Add($Matches[1], $Matches[2]) } }
Write-Progress -Activity 'Scanning GIT pack files'
$blobs = @(dir .\.git\objects\pack\pack-*.idx | %{ git verify-pack -v $_ | ?{ $_ -match '^\w+ blob ' } })

$files = @{}
$cnt = 0
$blobs | %{
    $cnt++
    Write-Progress -Activity "Merging $($blobs.Count) blobs from pack files with $($objects_map.Count) file objects" -PercentComplete ($cnt * 100 / $blobs.Count)

    if ($_ -match '^(\w+) blob   (\d+) (\d+) \d+(?: (\d+) \w+)?$') {
        $hash = $Matches[1]
        $size = [long]$Matches[2]
        $size_in_pack = [int]$Matches[3]
        $is_diff = ($Matches[4] -ne $null -and $Matches[4] -ne '') 
        $filename = $objects_map[$hash]
        if ($filename) {
            #Write-Host "$filename $is_diff $size $size_in_pack"
            $exists = Test-Path $filename
            $file = $files[$filename]
            if ($file -eq $null) {
                $file = New-Object psobject
                $file | Add-Member 'FileName' $FileName
                $file | Add-Member 'SizeTotal' 0
                $file | Add-Member 'SizeDiff' 0
                $file | Add-Member 'SizeInPackTotal' 0
                $file | Add-Member 'SizeInPackDiff' 0
                $file | Add-Member 'Exists' $exists
                $file | Add-Member 'VersionsTotal' 0
                $file | Add-Member 'VersionsDiff' 0
                $files.Add($FileName, $file)
            }

            $file.VersionsTotal += 1
            $file.SizeTotal += $size
            $file.SizeInPackTotal += $size_in_pack
            if ($is_diff) {
                $file.VersionsDiff += 1
                $file.SizeDiff += $size
                $file.SizeInPackDiff += $size_in_pack
            }
        }
    }
}

$files.Values

$cnt = 0
$directories = @{}
$files.Values | %{
    $file = $_
    $cnt++
    Write-Progress -Activity "Aggregating $($files.Count) files into directories" -PercentComplete ($cnt * 100 / $files.Count)

    #Write-Host "$($file.Filename)"

    $parent = Split-GitPath $file.Filename
    do {
        $directory_title = $parent + '/.(total)'
        #Write-Host "$($file.Filename) ==> $directory_title"

        if ($parent -eq '') {
            $exists = $true
        } else {
            $exists = Test-Path $parent
        }

        $directory = $directories[$directory_title]

        if ($directory -eq $null) {
            $directory = New-Object psobject
            $directory | Add-Member 'FileName' $directory_title
            $directory | Add-Member 'SizeTotal' 0
            $directory | Add-Member 'SizeDiff' 0
            $directory | Add-Member 'SizeInPackTotal' 0
            $directory | Add-Member 'SizeInPackDiff' 0
            $directory | Add-Member 'Exists' $exists
            $directory | Add-Member 'VersionsTotal' 0
            $directory | Add-Member 'VersionsDiff' 0
            $directories.Add($directory_title, $directory)
        }

        $directory.SizeTotal += $file.SizeTotal
        $directory.SizeDiff += $file.SizeDiff
        $directory.SizeInPackTotal += $file.SizeInPackTotal
        $directory.SizeInPackDiff += $file.SizeInPackDiff
        $directory.VersionsTotal += $file.VersionsTotal
        $directory.VersionsDiff += $file.VersionsDiff

        if ($file.Exists) {
            $directory_title = $parent + '/.(total-current)'
            $exists = Test-Path $directory_title

            $directory = $directories[$directory_title]

            if ($directory -eq $null) {
                $directory = New-Object psobject
                $directory | Add-Member 'FileName' $directory_title
                $directory | Add-Member 'SizeTotal' 0
                $directory | Add-Member 'SizeDiff' 0
                $directory | Add-Member 'SizeInPackTotal' 0
                $directory | Add-Member 'SizeInPackDiff' 0
                $directory | Add-Member 'Exists' $true
                $directory | Add-Member 'VersionsTotal' 0
                $directory | Add-Member 'VersionsDiff' 0
                $directories.Add($directory_title, $directory)
            }

            $directory.SizeTotal += $file.SizeTotal
            $directory.SizeDiff += $file.SizeDiff
            $directory.SizeInPackTotal += $file.SizeInPackTotal
            $directory.SizeInPackDiff += $file.SizeInPackDiff
            $directory.VersionsTotal += $file.VersionsTotal
            $directory.VersionsDiff += $file.VersionsDiff
        } else {
            $directory_title = $parent + '/.(total-old)'
            $exists = Test-Path $directory_title

            $directory = $directories[$directory_title]

            if ($directory -eq $null) {
                $directory = New-Object psobject
                $directory | Add-Member 'FileName' $directory_title
                $directory | Add-Member 'SizeTotal' 0
                $directory | Add-Member 'SizeDiff' 0
                $directory | Add-Member 'SizeInPackTotal' 0
                $directory | Add-Member 'SizeInPackDiff' 0
                $directory | Add-Member 'Exists' $false
                $directory | Add-Member 'VersionsTotal' 0
                $directory | Add-Member 'VersionsDiff' 0
                $directories.Add($directory_title, $directory)
            }

            $directory.SizeTotal += $file.SizeTotal
            $directory.SizeDiff += $file.SizeDiff
            $directory.SizeInPackTotal += $file.SizeInPackTotal
            $directory.SizeInPackDiff += $file.SizeInPackDiff
            $directory.VersionsTotal += $file.VersionsTotal
            $directory.VersionsDiff += $file.VersionsDiff
        }
    
        if ($parent -eq '') {
            break
        }

        $parent = Split-GitPath $parent
    } while ($true)
}

$directories.Values

popd

Z Explanation.md

First download Get-GitRepositorySizes.ps1 and put in e.g. c:\scripts\

Fill $items with all size information:

cd \SourceGIT\ContactCentre
git checkout master
$items = $(c:\scripts\Get-GitRepositorySizes.ps1)

Extract useful information: All files/directories bigger than 5 MB:

$items | ?{ $_.SizeTotal -gt 5000000 } | sort FileName | Format-Table `
    -AutoSize | Out-File c:\temp\ContactCentre-Sizes-5MB.txt

Top level directory info:

$items | ?{ $_.FileName -match '^[^/]+/.(.*)$'} | sort SizeTotal -descending | Format-Table -AutoSize

Explanation of fictive items:

• .(total-current): recursive directory size of files that currently exist in the branch that is checked out.
• .(total-old): recursive directory size of files that don't exist in the branch that is checked out (e.g. deleted files).
• .(total): sum of .(total-current) and .(total-old).

Explanation of most important columns:

• SizeTotal: Total size in the repository history.
• SizeInPackTotal: Compressed size in the repository history.
• VersionsTotal: Total number of versions in the repository history.
• Exists: This item exists in the current checkout.

Other columns:

• SizeDiff: Size optimized by GIT diffs (also included in Total above).
• SizeInPackDiff: Compressed size optimized by GIT diffs (also included in Total above).
• VersionsDiff: Number of versions that were optimized by GIT diffs (also included in Total above).