images.go 29 KB
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package server

import (
	"bytes"
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	"context"
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	"crypto/sha256"
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	"encoding/hex"
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	"encoding/json"
	"errors"
	"fmt"
	"io"
	"log"
	"net/http"
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	"net/url"
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	"os"
	"path/filepath"
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	"reflect"
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	"runtime"
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	"strconv"
	"strings"
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	"text/template"
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	"golang.org/x/exp/slices"

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	"github.com/jmorganca/ollama/api"
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	"github.com/jmorganca/ollama/llm"
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	"github.com/jmorganca/ollama/parser"
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	"github.com/jmorganca/ollama/version"
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)

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type RegistryOptions struct {
	Insecure bool
	Username string
	Password string
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	Token    string
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}

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type Model struct {
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	Name          string `json:"name"`
	ShortName     string
	ModelPath     string
	OriginalModel string
	AdapterPaths  []string
	Template      string
	System        string
	License       []string
	Digest        string
	Options       map[string]interface{}
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}

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func (m *Model) Prompt(request api.GenerateRequest) (string, error) {
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	t := m.Template
	if request.Template != "" {
		t = request.Template
	}

	tmpl, err := template.New("").Parse(t)
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	if err != nil {
		return "", err
	}

	var vars struct {
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		First  bool
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		System string
		Prompt string
	}

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	vars.First = len(request.Context) == 0
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	vars.System = m.System
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	vars.Prompt = request.Prompt

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	if request.System != "" {
		vars.System = request.System
	}

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	var sb strings.Builder
	if err := tmpl.Execute(&sb, vars); err != nil {
		return "", err
	}

	return sb.String(), nil
}

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type ManifestV2 struct {
	SchemaVersion int      `json:"schemaVersion"`
	MediaType     string   `json:"mediaType"`
	Config        Layer    `json:"config"`
	Layers        []*Layer `json:"layers"`
}

type Layer struct {
	MediaType string `json:"mediaType"`
	Digest    string `json:"digest"`
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	Size      int64  `json:"size"`
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	From      string `json:"from,omitempty"`
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}

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type LayerReader struct {
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	Layer
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	io.Reader
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}

type ConfigV2 struct {
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	ModelFormat string `json:"model_format"`
	ModelFamily string `json:"model_family"`
	ModelType   string `json:"model_type"`
	FileType    string `json:"file_type"`
	RootFS      RootFS `json:"rootfs"`
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	// required by spec
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	Architecture string `json:"architecture"`
	OS           string `json:"os"`
}

type RootFS struct {
	Type    string   `json:"type"`
	DiffIDs []string `json:"diff_ids"`
}

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func (m *ManifestV2) GetTotalSize() (total int64) {
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	for _, layer := range m.Layers {
		total += layer.Size
	}
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	total += m.Config.Size
	return total
}

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func GetManifest(mp ModelPath) (*ManifestV2, string, error) {
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	fp, err := mp.GetManifestPath()
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	if err != nil {
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		return nil, "", err
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	}
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	if _, err = os.Stat(fp); err != nil {
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		return nil, "", err
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	}

	var manifest *ManifestV2

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	bts, err := os.ReadFile(fp)
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	if err != nil {
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		return nil, "", fmt.Errorf("couldn't open file '%s'", fp)
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	}

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	shaSum := sha256.Sum256(bts)
	shaStr := hex.EncodeToString(shaSum[:])

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	if err := json.Unmarshal(bts, &manifest); err != nil {
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		return nil, "", err
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	}

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	return manifest, shaStr, nil
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}

func GetModel(name string) (*Model, error) {
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	mp := ParseModelPath(name)
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	manifest, digest, err := GetManifest(mp)
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	if err != nil {
		return nil, err
	}

	model := &Model{
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		Name:      mp.GetFullTagname(),
		ShortName: mp.GetShortTagname(),
		Digest:    digest,
		Template:  "{{ .Prompt }}",
		License:   []string{},
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	}

	for _, layer := range manifest.Layers {
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		filename, err := GetBlobsPath(layer.Digest)
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		if err != nil {
			return nil, err
		}

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		switch layer.MediaType {
		case "application/vnd.ollama.image.model":
			model.ModelPath = filename
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			model.OriginalModel = layer.From
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		case "application/vnd.ollama.image.embed":
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			// Deprecated in versions  > 0.1.2
			// TODO: remove this warning in a future version
			log.Print("WARNING: model contains embeddings, but embeddings in modelfiles have been deprecated and will be ignored.")
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		case "application/vnd.ollama.image.adapter":
			model.AdapterPaths = append(model.AdapterPaths, filename)
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		case "application/vnd.ollama.image.template":
			bts, err := os.ReadFile(filename)
			if err != nil {
				return nil, err
			}

			model.Template = string(bts)
		case "application/vnd.ollama.image.system":
			bts, err := os.ReadFile(filename)
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			if err != nil {
				return nil, err
			}
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			model.System = string(bts)
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		case "application/vnd.ollama.image.prompt":
			bts, err := os.ReadFile(filename)
			if err != nil {
				return nil, err
			}

			model.Template = string(bts)
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		case "application/vnd.ollama.image.params":
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			params, err := os.Open(filename)
			if err != nil {
				return nil, err
			}
			defer params.Close()
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			// parse model options parameters into a map so that we can see which fields have been specified explicitly
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			if err = json.NewDecoder(params).Decode(&model.Options); err != nil {
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				return nil, err
			}
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		case "application/vnd.ollama.image.license":
			bts, err := os.ReadFile(filename)
			if err != nil {
				return nil, err
			}
			model.License = append(model.License, string(bts))
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		}
	}

	return model, nil
}

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func realpath(mfDir, from string) string {
	abspath, err := filepath.Abs(from)
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	if err != nil {
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		return from
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	}

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	home, err := os.UserHomeDir()
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	if err != nil {
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		return abspath
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	}

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	if from == "~" {
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		return home
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	} else if strings.HasPrefix(from, "~/") {
		return filepath.Join(home, from[2:])
	}

	if _, err := os.Stat(filepath.Join(mfDir, from)); err == nil {
		// this is a file relative to the Modelfile
		return filepath.Join(mfDir, from)
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	}

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	return abspath
}

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func CreateModel(ctx context.Context, name, modelFileDir string, commands []parser.Command, fn func(resp api.ProgressResponse)) error {
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	config := ConfigV2{
		OS:           "linux",
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		Architecture: "amd64",
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	}

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	deleteMap := make(map[string]struct{})

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	var layers []*LayerReader
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	params := make(map[string][]string)
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	fromParams := make(map[string]any)

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	for _, c := range commands {
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		log.Printf("[%s] - %s", c.Name, c.Args)
		mediatype := fmt.Sprintf("application/vnd.ollama.image.%s", c.Name)

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		switch c.Name {
		case "model":
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			if strings.HasPrefix(c.Args, "@") {
				blobPath, err := GetBlobsPath(strings.TrimPrefix(c.Args, "@"))
				if err != nil {
					return err
				}

				c.Args = blobPath
			}

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			bin, err := os.Open(realpath(modelFileDir, c.Args))
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			if err != nil {
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				// not a file on disk so must be a model reference
				modelpath := ParseModelPath(c.Args)
				manifest, _, err := GetManifest(modelpath)
				switch {
				case errors.Is(err, os.ErrNotExist):
					fn(api.ProgressResponse{Status: "pulling model"})
					if err := PullModel(ctx, c.Args, &RegistryOptions{}, fn); err != nil {
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						return err
					}

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					manifest, _, err = GetManifest(modelpath)
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					if err != nil {
						return err
					}
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				case err != nil:
					return err
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				}
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				fn(api.ProgressResponse{Status: "reading model metadata"})
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				fromConfigPath, err := GetBlobsPath(manifest.Config.Digest)
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				if err != nil {
					return err
				}

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				fromConfigFile, err := os.Open(fromConfigPath)
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				if err != nil {
					return err
				}
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				defer fromConfigFile.Close()
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				var fromConfig ConfigV2
				if err := json.NewDecoder(fromConfigFile).Decode(&fromConfig); err != nil {
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					return err
				}

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				config.ModelFormat = fromConfig.ModelFormat
				config.ModelFamily = fromConfig.ModelFamily
				config.ModelType = fromConfig.ModelType
				config.FileType = fromConfig.FileType
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				for _, layer := range manifest.Layers {
					deleteMap[layer.Digest] = struct{}{}
					if layer.MediaType == "application/vnd.ollama.image.params" {
						fromParamsPath, err := GetBlobsPath(layer.Digest)
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						if err != nil {
							return err
						}

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						fromParamsFile, err := os.Open(fromParamsPath)
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						if err != nil {
							return err
						}
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						defer fromParamsFile.Close()
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						if err := json.NewDecoder(fromParamsFile).Decode(&fromParams); err != nil {
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							return err
						}
					}

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					layer, err := GetLayerWithBufferFromLayer(layer)
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					if err != nil {
						return err
					}
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					layer.From = modelpath.GetShortTagname()
					layers = append(layers, layer)
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				}
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				deleteMap[manifest.Config.Digest] = struct{}{}
				continue
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			}
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			defer bin.Close()
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			fn(api.ProgressResponse{Status: "creating model layer"})
			ggml, err := llm.DecodeGGML(bin)
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			if err != nil {
				return err
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			}

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			config.ModelFormat = ggml.Name()
			config.ModelFamily = ggml.ModelFamily()
			config.ModelType = ggml.ModelType()
			config.FileType = ggml.FileType()

			bin.Seek(0, io.SeekStart)
			layer, err := CreateLayer(bin)
			if err != nil {
				return err
			}
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			layer.MediaType = mediatype
			layers = append(layers, layer)
		case "adapter":
			fn(api.ProgressResponse{Status: "creating adapter layer"})
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			bin, err := os.Open(realpath(modelFileDir, c.Args))
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			if err != nil {
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				return err
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			}
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			defer bin.Close()
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			layer, err := CreateLayer(bin)
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			if err != nil {
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				return err
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			}
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			if layer.Size > 0 {
				layer.MediaType = mediatype
				layers = append(layers, layer)
			}
		case "license":
			fn(api.ProgressResponse{Status: "creating license layer"})
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			layer, err := CreateLayer(strings.NewReader(c.Args))
			if err != nil {
				return err
			}

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			if layer.Size > 0 {
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				layer.MediaType = mediatype
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				layers = append(layers, layer)
			}
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		case "template", "system":
			fn(api.ProgressResponse{Status: fmt.Sprintf("creating %s layer", c.Name)})

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			// remove duplicate layers
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			layers = removeLayerFromLayers(layers, mediatype)
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			layer, err := CreateLayer(strings.NewReader(c.Args))
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			if err != nil {
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				return err
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			}
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			if layer.Size > 0 {
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				layer.MediaType = mediatype
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				layers = append(layers, layer)
			}
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		default:
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			params[c.Name] = append(params[c.Name], c.Args)
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		}
	}

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	if len(params) > 0 {
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		fn(api.ProgressResponse{Status: "creating parameters layer"})
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		formattedParams, err := formatParams(params)
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		if err != nil {
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			return err
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		}
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		for k, v := range fromParams {
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			if _, ok := formattedParams[k]; !ok {
				formattedParams[k] = v
			}
		}

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		if config.ModelType == "65B" {
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			if gqa, ok := formattedParams["gqa"].(int); ok && gqa == 8 {
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				config.ModelType = "70B"
			}
		}

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		var b bytes.Buffer
		if err := json.NewEncoder(&b).Encode(formattedParams); err != nil {
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			return err
		}

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		fn(api.ProgressResponse{Status: "creating config layer"})
		layer, err := CreateLayer(bytes.NewReader(b.Bytes()))
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		if err != nil {
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			return err
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		}
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		layer.MediaType = "application/vnd.ollama.image.params"
		layers = append(layers, layer)
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	}

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	digests, err := getLayerDigests(layers)
	if err != nil {
		return err
	}

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	configLayer, err := createConfigLayer(config, digests)
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	if err != nil {
		return err
	}
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	layers = append(layers, configLayer)
	delete(deleteMap, configLayer.Digest)
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	if err := SaveLayers(layers, fn, false); err != nil {
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		return err
	}

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	var contentLayers []*Layer
	for _, layer := range layers {
		contentLayers = append(contentLayers, &layer.Layer)
		delete(deleteMap, layer.Digest)
	}

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	fn(api.ProgressResponse{Status: "writing manifest"})
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	if err := CreateManifest(name, configLayer, contentLayers); err != nil {
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		return err
	}

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	if noprune := os.Getenv("OLLAMA_NOPRUNE"); noprune == "" {
		if err := deleteUnusedLayers(nil, deleteMap, false); err != nil {
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			return err
		}
	}

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	fn(api.ProgressResponse{Status: "success"})
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	return nil
}

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func removeLayerFromLayers(layers []*LayerReader, mediaType string) []*LayerReader {
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	return slices.DeleteFunc(layers, func(layer *LayerReader) bool {
		return layer.MediaType == mediaType
	})
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}

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func SaveLayers(layers []*LayerReader, fn func(resp api.ProgressResponse), force bool) error {
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	// Write each of the layers to disk
	for _, layer := range layers {
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		fp, err := GetBlobsPath(layer.Digest)
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		if err != nil {
			return err
		}
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		_, err = os.Stat(fp)
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		if os.IsNotExist(err) || force {
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			fn(api.ProgressResponse{Status: fmt.Sprintf("writing layer %s", layer.Digest)})

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			out, err := os.Create(fp)
			if err != nil {
				log.Printf("couldn't create %s", fp)
				return err
			}
			defer out.Close()

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			if _, err = io.Copy(out, layer.Reader); err != nil {
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				return err
			}
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		} else {
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			fn(api.ProgressResponse{Status: fmt.Sprintf("using already created layer %s", layer.Digest)})
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		}
	}

	return nil
}

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func CreateManifest(name string, cfg *LayerReader, layers []*Layer) error {
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	mp := ParseModelPath(name)
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	manifest := ManifestV2{
		SchemaVersion: 2,
		MediaType:     "application/vnd.docker.distribution.manifest.v2+json",
		Config: Layer{
			MediaType: cfg.MediaType,
			Size:      cfg.Size,
			Digest:    cfg.Digest,
		},
		Layers: layers,
	}

	manifestJSON, err := json.Marshal(manifest)
	if err != nil {
		return err
	}

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	fp, err := mp.GetManifestPath()
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	if err != nil {
		return err
	}
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	if err := os.MkdirAll(filepath.Dir(fp), 0o755); err != nil {
		return err
	}
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	return os.WriteFile(fp, manifestJSON, 0o644)
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}

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func GetLayerWithBufferFromLayer(layer *Layer) (*LayerReader, error) {
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	fp, err := GetBlobsPath(layer.Digest)
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	if err != nil {
		return nil, err
	}

	file, err := os.Open(fp)
	if err != nil {
		return nil, fmt.Errorf("could not open blob: %w", err)
	}
	defer file.Close()

	newLayer, err := CreateLayer(file)
	if err != nil {
		return nil, err
	}
	newLayer.MediaType = layer.MediaType
	return newLayer, nil
}

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// formatParams converts specified parameter options to their correct types
func formatParams(params map[string][]string) (map[string]interface{}, error) {
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	opts := api.Options{}
	valueOpts := reflect.ValueOf(&opts).Elem() // names of the fields in the options struct
	typeOpts := reflect.TypeOf(opts)           // types of the fields in the options struct
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	// build map of json struct tags to their types
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	jsonOpts := make(map[string]reflect.StructField)
	for _, field := range reflect.VisibleFields(typeOpts) {
		jsonTag := strings.Split(field.Tag.Get("json"), ",")[0]
		if jsonTag != "" {
			jsonOpts[jsonTag] = field
		}
	}

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	out := make(map[string]interface{})
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	// iterate params and set values based on json struct tags
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	for key, vals := range params {
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		if opt, ok := jsonOpts[key]; ok {
			field := valueOpts.FieldByName(opt.Name)
			if field.IsValid() && field.CanSet() {
				switch field.Kind() {
				case reflect.Float32:
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					floatVal, err := strconv.ParseFloat(vals[0], 32)
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					if err != nil {
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						return nil, fmt.Errorf("invalid float value %s", vals)
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					}

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					out[key] = float32(floatVal)
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				case reflect.Int:
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					intVal, err := strconv.ParseInt(vals[0], 10, 64)
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					if err != nil {
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						return nil, fmt.Errorf("invalid int value %s", vals)
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					}

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					out[key] = intVal
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				case reflect.Bool:
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					boolVal, err := strconv.ParseBool(vals[0])
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					if err != nil {
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						return nil, fmt.Errorf("invalid bool value %s", vals)
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					}

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					out[key] = boolVal
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				case reflect.String:
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					out[key] = vals[0]
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				case reflect.Slice:
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					// TODO: only string slices are supported right now
					out[key] = vals
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				default:
					return nil, fmt.Errorf("unknown type %s for %s", field.Kind(), key)
				}
			}
		}
	}

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	return out, nil
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}

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func getLayerDigests(layers []*LayerReader) ([]string, error) {
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	var digests []string
	for _, l := range layers {
		if l.Digest == "" {
			return nil, fmt.Errorf("layer is missing a digest")
		}
		digests = append(digests, l.Digest)
	}
	return digests, nil
}

// CreateLayer creates a Layer object from a given file
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func CreateLayer(f io.ReadSeeker) (*LayerReader, error) {
	digest, size := GetSHA256Digest(f)
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	f.Seek(0, io.SeekStart)
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	layer := &LayerReader{
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		Layer: Layer{
			MediaType: "application/vnd.docker.image.rootfs.diff.tar",
			Digest:    digest,
			Size:      size,
		},
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		Reader: f,
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	}

	return layer, nil
}

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func CopyModel(src, dest string) error {
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	srcModelPath := ParseModelPath(src)
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	srcPath, err := srcModelPath.GetManifestPath()
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	if err != nil {
		return err
	}

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	destModelPath := ParseModelPath(dest)
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	destPath, err := destModelPath.GetManifestPath()
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	if err != nil {
		return err
	}
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	if err := os.MkdirAll(filepath.Dir(destPath), 0o755); err != nil {
		return err
	}
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	// copy the file
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	input, err := os.ReadFile(srcPath)
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	if err != nil {
		fmt.Println("Error reading file:", err)
		return err
	}

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	err = os.WriteFile(destPath, input, 0o644)
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	if err != nil {
		fmt.Println("Error reading file:", err)
		return err
	}

	return nil
}

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func deleteUnusedLayers(skipModelPath *ModelPath, deleteMap map[string]struct{}, dryRun bool) error {
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	fp, err := GetManifestPath()
	if err != nil {
		return err
	}
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	walkFunc := func(path string, info os.FileInfo, _ error) error {
		if info.IsDir() {
			return nil
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		}

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		dir, file := filepath.Split(path)
		dir = strings.Trim(strings.TrimPrefix(dir, fp), string(os.PathSeparator))
		tag := strings.Join([]string{dir, file}, ":")
		fmp := ParseModelPath(tag)
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		// skip the manifest we're trying to delete
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		if skipModelPath != nil && skipModelPath.GetFullTagname() == fmp.GetFullTagname() {
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			return nil
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		}
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		// save (i.e. delete from the deleteMap) any files used in other manifests
		manifest, _, err := GetManifest(fmp)
		if err != nil {
			return nil
		}

		for _, layer := range manifest.Layers {
			delete(deleteMap, layer.Digest)
		}

		delete(deleteMap, manifest.Config.Digest)
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		return nil
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	}

	if err := filepath.Walk(fp, walkFunc); err != nil {
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		return err
	}
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	// only delete the files which are still in the deleteMap
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	for k := range deleteMap {
		fp, err := GetBlobsPath(k)
		if err != nil {
			log.Printf("couldn't get file path for '%s': %v", k, err)
			continue
		}
		if !dryRun {
			if err := os.Remove(fp); err != nil {
				log.Printf("couldn't remove file '%s': %v", fp, err)
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				continue
			}
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		} else {
			log.Printf("wanted to remove: %s", fp)
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		}
	}

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	return nil
}

func PruneLayers() error {
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	deleteMap := make(map[string]struct{})
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	p, err := GetBlobsPath("")
	if err != nil {
		return err
	}

	blobs, err := os.ReadDir(p)
	if err != nil {
		log.Printf("couldn't read dir '%s': %v", p, err)
		return err
	}

	for _, blob := range blobs {
		name := blob.Name()
		if runtime.GOOS == "windows" {
			name = strings.ReplaceAll(name, "-", ":")
		}
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		if strings.HasPrefix(name, "sha256:") {
			deleteMap[name] = struct{}{}
		}
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	}

	log.Printf("total blobs: %d", len(deleteMap))

	err = deleteUnusedLayers(nil, deleteMap, false)
	if err != nil {
		return err
	}

	log.Printf("total unused blobs removed: %d", len(deleteMap))

	return nil
}

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func PruneDirectory(path string) error {
	info, err := os.Lstat(path)
	if err != nil {
		return err
	}

	if info.IsDir() && info.Mode()&os.ModeSymlink == 0 {
		entries, err := os.ReadDir(path)
		if err != nil {
			return err
		}

		for _, entry := range entries {
			if err := PruneDirectory(filepath.Join(path, entry.Name())); err != nil {
				return err
			}
		}

		entries, err = os.ReadDir(path)
		if err != nil {
			return err
		}

		if len(entries) > 0 {
			return nil
		}

		return os.Remove(path)
	}

	return nil
}

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func DeleteModel(name string) error {
	mp := ParseModelPath(name)
	manifest, _, err := GetManifest(mp)
	if err != nil {
		return err
	}

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	deleteMap := make(map[string]struct{})
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	for _, layer := range manifest.Layers {
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		deleteMap[layer.Digest] = struct{}{}
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	}
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	deleteMap[manifest.Config.Digest] = struct{}{}
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	err = deleteUnusedLayers(&mp, deleteMap, false)
	if err != nil {
		return err
	}

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	fp, err := mp.GetManifestPath()
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	if err != nil {
		return err
	}
	err = os.Remove(fp)
	if err != nil {
		log.Printf("couldn't remove manifest file '%s': %v", fp, err)
		return err
	}

	return nil
}

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func ShowModelfile(model *Model) (string, error) {
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	var mt struct {
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		*Model
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		From       string
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		Parameters map[string][]any
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	}

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	mt.Parameters = make(map[string][]any)
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	for k, v := range model.Options {
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		if s, ok := v.([]any); ok {
			mt.Parameters[k] = s
			continue
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		}

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		mt.Parameters[k] = []any{v}
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	}

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	mt.Model = model
	mt.From = model.ModelPath
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	if model.OriginalModel != "" {
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		mt.From = model.OriginalModel
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	}

	modelFile := `# Modelfile generated by "ollama show"
# To build a new Modelfile based on this one, replace the FROM line with:
# FROM {{ .ShortName }}

FROM {{ .From }}
TEMPLATE """{{ .Template }}"""
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{{- if .System }}
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SYSTEM """{{ .System }}"""
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{{- end }}
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{{- range $adapter := .AdapterPaths }}
ADAPTER {{ $adapter }}
{{- end }}
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{{- range $k, $v := .Parameters }}
{{- range $parameter := $v }}
PARAMETER {{ $k }} {{ printf "%#v" $parameter }}
{{- end }}
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{{- end }}`
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	tmpl, err := template.New("").Parse(modelFile)
	if err != nil {
		log.Printf("error parsing template: %q", err)
		return "", err
	}

	var buf bytes.Buffer

	if err = tmpl.Execute(&buf, mt); err != nil {
		log.Printf("error executing template: %q", err)
		return "", err
	}

	return buf.String(), nil
}

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func PushModel(ctx context.Context, name string, regOpts *RegistryOptions, fn func(api.ProgressResponse)) error {
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	mp := ParseModelPath(name)
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	fn(api.ProgressResponse{Status: "retrieving manifest"})

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	if mp.ProtocolScheme == "http" && !regOpts.Insecure {
		return fmt.Errorf("insecure protocol http")
	}

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	manifest, _, err := GetManifest(mp)
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	if err != nil {
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		fn(api.ProgressResponse{Status: "couldn't retrieve manifest"})
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		return err
	}

	var layers []*Layer
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	layers = append(layers, manifest.Layers...)
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	layers = append(layers, &manifest.Config)

	for _, layer := range layers {
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		if err := uploadBlob(ctx, mp, layer, regOpts, fn); err != nil {
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			log.Printf("error uploading blob: %v", err)
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			if errors.Is(err, errUnauthorized) {
				return fmt.Errorf("unable to push %s, make sure this namespace exists and you are authorized to push to it", ParseModelPath(name).GetNamespaceRepository())
			}
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			return err
		}
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	}

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	fn(api.ProgressResponse{Status: "pushing manifest"})
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	requestURL := mp.BaseURL()
	requestURL = requestURL.JoinPath("v2", mp.GetNamespaceRepository(), "manifests", mp.Tag)
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	manifestJSON, err := json.Marshal(manifest)
	if err != nil {
		return err
	}

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	headers := make(http.Header)
	headers.Set("Content-Type", "application/vnd.docker.distribution.manifest.v2+json")
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	resp, err := makeRequestWithRetry(ctx, http.MethodPut, requestURL, headers, bytes.NewReader(manifestJSON), regOpts)
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	if err != nil {
		return err
	}
	defer resp.Body.Close()

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	fn(api.ProgressResponse{Status: "success"})
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	return nil
}

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func PullModel(ctx context.Context, name string, regOpts *RegistryOptions, fn func(api.ProgressResponse)) error {
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	mp := ParseModelPath(name)

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	var manifest *ManifestV2
	var err error
	var noprune string

	// build deleteMap to prune unused layers
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	deleteMap := make(map[string]struct{})
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	if noprune = os.Getenv("OLLAMA_NOPRUNE"); noprune == "" {
		manifest, _, err = GetManifest(mp)
		if err != nil && !errors.Is(err, os.ErrNotExist) {
			return err
		}

		if manifest != nil {
			for _, l := range manifest.Layers {
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				deleteMap[l.Digest] = struct{}{}
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			}
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			deleteMap[manifest.Config.Digest] = struct{}{}
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		}
	}

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	if mp.ProtocolScheme == "http" && !regOpts.Insecure {
		return fmt.Errorf("insecure protocol http")
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	}
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	fn(api.ProgressResponse{Status: "pulling manifest"})
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	manifest, err = pullModelManifest(ctx, mp, regOpts)
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	if err != nil {
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		return fmt.Errorf("pull model manifest: %s", err)
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	}

	var layers []*Layer
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	layers = append(layers, manifest.Layers...)
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	layers = append(layers, &manifest.Config)

	for _, layer := range layers {
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		if err := downloadBlob(
			ctx,
			downloadOpts{
				mp:      mp,
				digest:  layer.Digest,
				regOpts: regOpts,
				fn:      fn,
			}); err != nil {
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			return err
		}
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		delete(deleteMap, layer.Digest)
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	}
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	delete(deleteMap, manifest.Config.Digest)
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	fn(api.ProgressResponse{Status: "verifying sha256 digest"})
	for _, layer := range layers {
		if err := verifyBlob(layer.Digest); err != nil {
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			if errors.Is(err, errDigestMismatch) {
				// something went wrong, delete the blob
				fp, err := GetBlobsPath(layer.Digest)
				if err != nil {
					return err
				}
				if err := os.Remove(fp); err != nil {
					// log this, but return the original error
					log.Printf("couldn't remove file with digest mismatch '%s': %v", fp, err)
				}
			}
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			return err
		}
	}

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	fn(api.ProgressResponse{Status: "writing manifest"})
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	manifestJSON, err := json.Marshal(manifest)
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	if err != nil {
		return err
	}

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	fp, err := mp.GetManifestPath()
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	if err != nil {
		return err
	}
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	if err := os.MkdirAll(filepath.Dir(fp), 0o755); err != nil {
		return err
	}
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	err = os.WriteFile(fp, manifestJSON, 0o644)
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	if err != nil {
		log.Printf("couldn't write to %s", fp)
		return err
	}

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	if noprune == "" {
		fn(api.ProgressResponse{Status: "removing any unused layers"})
		err = deleteUnusedLayers(nil, deleteMap, false)
		if err != nil {
			return err
		}
	}

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	fn(api.ProgressResponse{Status: "success"})
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	return nil
}

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func pullModelManifest(ctx context.Context, mp ModelPath, regOpts *RegistryOptions) (*ManifestV2, error) {
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	requestURL := mp.BaseURL().JoinPath("v2", mp.GetNamespaceRepository(), "manifests", mp.Tag)
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	headers := make(http.Header)
	headers.Set("Accept", "application/vnd.docker.distribution.manifest.v2+json")
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	resp, err := makeRequestWithRetry(ctx, http.MethodGet, requestURL, headers, nil, regOpts)
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	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	var m *ManifestV2
	if err := json.NewDecoder(resp.Body).Decode(&m); err != nil {
		return nil, err
	}

	return m, err
}

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func createConfigLayer(config ConfigV2, layers []string) (*LayerReader, error) {
	config.RootFS = RootFS{
		Type:    "layers",
		DiffIDs: layers,
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	}

	configJSON, err := json.Marshal(config)
	if err != nil {
		return nil, err
	}

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	digest, size := GetSHA256Digest(bytes.NewBuffer(configJSON))
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	layer := &LayerReader{
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		Layer: Layer{
			MediaType: "application/vnd.docker.container.image.v1+json",
			Digest:    digest,
			Size:      size,
		},
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		Reader: bytes.NewBuffer(configJSON),
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	}
	return layer, nil
}

// GetSHA256Digest returns the SHA256 hash of a given buffer and returns it, and the size of buffer
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func GetSHA256Digest(r io.Reader) (string, int64) {
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	h := sha256.New()
	n, err := io.Copy(h, r)
	if err != nil {
		log.Fatal(err)
	}

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	return fmt.Sprintf("sha256:%x", h.Sum(nil)), n
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}

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var errUnauthorized = fmt.Errorf("unauthorized")

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func makeRequestWithRetry(ctx context.Context, method string, requestURL *url.URL, headers http.Header, body io.ReadSeeker, regOpts *RegistryOptions) (*http.Response, error) {
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	resp, err := makeRequest(ctx, method, requestURL, headers, body, regOpts)
	if err != nil {
		if !errors.Is(err, context.Canceled) {
			log.Printf("request failed: %v", err)
		}
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		return nil, err
	}

	switch {
	case resp.StatusCode == http.StatusUnauthorized:
		// Handle authentication error with one retry
		auth := resp.Header.Get("www-authenticate")
		authRedir := ParseAuthRedirectString(auth)
		token, err := getAuthToken(ctx, authRedir)
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		if err != nil {
			return nil, err
		}
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		regOpts.Token = token
		if body != nil {
			_, err = body.Seek(0, io.SeekStart)
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			if err != nil {
				return nil, err
			}
		}
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		resp, err := makeRequest(ctx, method, requestURL, headers, body, regOpts)
		if resp.StatusCode == http.StatusUnauthorized {
			return nil, errUnauthorized
		}

		return resp, err
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	case resp.StatusCode == http.StatusNotFound:
		return nil, os.ErrNotExist
	case resp.StatusCode >= http.StatusBadRequest:
		responseBody, err := io.ReadAll(resp.Body)
		if err != nil {
			return nil, fmt.Errorf("%d: %s", resp.StatusCode, err)
		}
		return nil, fmt.Errorf("%d: %s", resp.StatusCode, responseBody)
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	}

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	return resp, nil
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}

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func makeRequest(ctx context.Context, method string, requestURL *url.URL, headers http.Header, body io.Reader, regOpts *RegistryOptions) (*http.Response, error) {
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	if requestURL.Scheme != "http" && regOpts != nil && regOpts.Insecure {
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		requestURL.Scheme = "http"
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	}

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	req, err := http.NewRequestWithContext(ctx, method, requestURL.String(), body)
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	if err != nil {
		return nil, err
	}

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	if headers != nil {
		req.Header = headers
	}

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	if regOpts != nil {
		if regOpts.Token != "" {
			req.Header.Set("Authorization", "Bearer "+regOpts.Token)
		} else if regOpts.Username != "" && regOpts.Password != "" {
			req.SetBasicAuth(regOpts.Username, regOpts.Password)
		}
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	}

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	req.Header.Set("User-Agent", fmt.Sprintf("ollama/%s (%s %s) Go/%s", version.Version, runtime.GOARCH, runtime.GOOS, runtime.Version()))
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	if s := req.Header.Get("Content-Length"); s != "" {
		contentLength, err := strconv.ParseInt(s, 10, 64)
		if err != nil {
			return nil, err
		}

		req.ContentLength = contentLength
	}

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	proxyURL, err := http.ProxyFromEnvironment(req)
	if err != nil {
		return nil, err
	}

	client := http.Client{
		Transport: &http.Transport{
			Proxy: http.ProxyURL(proxyURL),
		},
	}

	resp, err := client.Do(req)
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	if err != nil {
		return nil, err
	}

	return resp, nil
}
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func getValue(header, key string) string {
	startIdx := strings.Index(header, key+"=")
	if startIdx == -1 {
		return ""
	}

	// Move the index to the starting quote after the key.
	startIdx += len(key) + 2
	endIdx := startIdx

	for endIdx < len(header) {
		if header[endIdx] == '"' {
			if endIdx+1 < len(header) && header[endIdx+1] != ',' { // If the next character isn't a comma, continue
				endIdx++
				continue
			}
			break
		}
		endIdx++
	}
	return header[startIdx:endIdx]
}

func ParseAuthRedirectString(authStr string) AuthRedirect {
	authStr = strings.TrimPrefix(authStr, "Bearer ")

	return AuthRedirect{
		Realm:   getValue(authStr, "realm"),
		Service: getValue(authStr, "service"),
		Scope:   getValue(authStr, "scope"),
	}
}

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var errDigestMismatch = fmt.Errorf("digest mismatch, file must be downloaded again")

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func verifyBlob(digest string) error {
	fp, err := GetBlobsPath(digest)
	if err != nil {
		return err
	}

	f, err := os.Open(fp)
	if err != nil {
		return err
	}
	defer f.Close()

	fileDigest, _ := GetSHA256Digest(f)
	if digest != fileDigest {
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		return fmt.Errorf("%w: want %s, got %s", errDigestMismatch, digest, fileDigest)
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	}

	return nil
}