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dotfiles/nixos/systems/0001-Add-Nix-integration.patch
main 60086123f3
Add Nomad-Docker Nix integration 
Signed-off-by: main <magic_rb@redalder.org>
2022-10-27 13:23:08 +02:00

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From ce5fb5686e7d54f51dc15aeb1ef4ec08d5635740 Mon Sep 17 00:00:00 2001
From: main <magic_rb@redalder.org>
Date: Tue, 25 Oct 2022 17:22:50 +0200
Subject: [PATCH] Add Nix integration
Signed-off-by: main <magic_rb@redalder.org>
---
drivers/docker/config.go | 19 ++++++-
drivers/docker/driver.go | 52 +++++++++++++++++--
drivers/docker/nix.go | 109 +++++++++++++++++++++++++++++++++++++++
3 files changed, 176 insertions(+), 4 deletions(-)
create mode 100644 drivers/docker/nix.go
diff --git a/drivers/docker/config.go b/drivers/docker/config.go
index 40d98966a..9aa26458f 100644
--- a/drivers/docker/config.go
+++ b/drivers/docker/config.go
@@ -108,6 +108,10 @@ func PluginLoader(opts map[string]string) (map[string]interface{}, error) {
conf["nvidia_runtime"] = v
}
+ if v, ok := opts["docker.gcroots_dir"]; ok {
+ conf["gcroots_dir"] = v
+ }
+
return conf, nil
}
@@ -281,6 +285,11 @@ var (
hclspec.NewLiteral(`"5m"`),
),
+ "gcroots_dir": hclspec.NewDefault(
+ hclspec.NewAttr("gcroots_dir", "string", false),
+ hclspec.NewLiteral(`"/nix/var/nix/gcroots/nomad-docker"`),
+ ),
+
// the duration that the driver will wait for activity from the Docker engine during an image pull
// before canceling the request
"pull_activity_timeout": hclspec.NewDefault(
@@ -327,7 +336,7 @@ var (
// taskConfigSpec is the hcl specification for the driver config section of
// a task within a job. It is returned in the TaskConfigSchema RPC
taskConfigSpec = hclspec.NewObject(map[string]*hclspec.Spec{
- "image": hclspec.NewAttr("image", "string", true),
+ "image": hclspec.NewAttr("image", "string", false),
"advertise_ipv6_address": hclspec.NewAttr("advertise_ipv6_address", "bool", false),
"args": hclspec.NewAttr("args", "list(string)", false),
"auth": hclspec.NewBlock("auth", false, hclspec.NewObject(map[string]*hclspec.Spec{
@@ -402,6 +411,9 @@ var (
"volumes": hclspec.NewAttr("volumes", "list(string)", false),
"volume_driver": hclspec.NewAttr("volume_driver", "string", false),
"work_dir": hclspec.NewAttr("work_dir", "string", false),
+
+ "nix_flake_ref": hclspec.NewAttr("nix_flake_ref", "string", false),
+ "nix_flake_sha": hclspec.NewAttr("nix_flake_sha", "string", false),
})
// driverCapabilities represents the RPC response for what features are
@@ -474,6 +486,9 @@ type TaskConfig struct {
VolumeDriver string `codec:"volume_driver"`
WorkDir string `codec:"work_dir"`
+ NixFlakeRef string `codec:"nix_flake_ref"`
+ NixFlakeSha string `codec:"nix_flake_sha"`
+
// MountsList supports the pre-1.0 mounts array syntax
MountsList []DockerMount `codec:"mounts"`
}
@@ -642,6 +657,8 @@ type DriverConfig struct {
ExtraLabels []string `codec:"extra_labels"`
Logging LoggingConfig `codec:"logging"`
+ GCRootsDir string `codec:"gcroots_dir"`
+
AllowRuntimesList []string `codec:"allow_runtimes"`
allowRuntimes map[string]struct{} `codec:"-"`
}
diff --git a/drivers/docker/driver.go b/drivers/docker/driver.go
index 0aa993845..812952fad 100644
--- a/drivers/docker/driver.go
+++ b/drivers/docker/driver.go
@@ -14,6 +14,7 @@ import (
"strings"
"sync"
"time"
+ "os/exec"
docker "github.com/fsouza/go-dockerclient"
"github.com/hashicorp/consul-template/signals"
@@ -254,7 +255,7 @@ func (d *Driver) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drive
return nil, nil, fmt.Errorf("failed to decode driver config: %v", err)
}
- if driverConfig.Image == "" {
+ if driverConfig.Image == "" && !(driverConfig.NixFlakeRef != "" && driverConfig.NixFlakeSha != "") {
return nil, nil, fmt.Errorf("image name required for docker driver")
}
@@ -269,6 +270,47 @@ func (d *Driver) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drive
return nil, nil, fmt.Errorf("Failed to connect to docker daemon: %s", err)
}
+ if driverConfig.NixFlakeRef != "" && driverConfig.NixFlakeSha != "" {
+ driverConfig.Image = "magicrb/nix-container-base@sha256:01f199486f5b0e3c90411d700436395f21154f8234b6dfa86eb224eb5b6ad43b";
+
+ nixExecutable, err := exec.LookPath("nix")
+ if err != nil {
+ return nil, nil, fmt.Errorf("failed to find `nix` executable")
+ }
+
+ err = NixBuildFlake(nixExecutable, driverConfig.NixFlakeRef, driverConfig.NixFlakeSha)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ deps, err := NixGetDeps(nixExecutable, driverConfig.NixFlakeRef)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ for _, dep := range deps {
+ var mount DockerMount
+ mount.Type = "bind"
+ mount.Target = dep;
+ mount.Source = dep;
+ mount.ReadOnly = true;
+
+ driverConfig.Mounts = append(driverConfig.Mounts, mount);
+ }
+
+ storePath, err := NixGetStorePath(nixExecutable, driverConfig.NixFlakeRef)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ driverConfig.Entrypoint[0] = storePath + "/" + driverConfig.Entrypoint[0]
+
+ os.Symlink(storePath, GetGCRoot(d.config.GCRootsDir, cfg.Name, cfg.AllocID))
+ }
+ if (driverConfig.NixFlakeRef != "") != (driverConfig.NixFlakeSha != "") {
+ d.logger.Warn("one of either nix_flake_ref or nix_flake_sha is not set", "container_id", cfg.ID, "nix_flake_ref", driverConfig.NixFlakeRef, "nix_flake_sha", driverConfig.NixFlakeSha)
+ }
+
id, err := d.createImage(cfg, &driverConfig, client)
if err != nil {
return nil, nil, err
@@ -1263,7 +1305,7 @@ func (d *Driver) toDockerMount(m *DockerMount, task *drivers.TaskConfig) (*docke
// paths inside alloc dir are always allowed as they mount within
// a container, and treated as relative to task dir
- if !d.config.Volumes.Enabled && !isParentPath(task.AllocDir, hm.Source) {
+ if !d.config.Volumes.Enabled && !isParentPath(task.AllocDir, hm.Source) && !isParentPath("/nix/store", hm.Source) {
return nil, fmt.Errorf(
"volumes are not enabled; cannot mount host path: %q %q",
hm.Source, task.AllocDir)
@@ -1425,7 +1467,11 @@ func (d *Driver) StopTask(taskID string, timeout time.Duration, signal string) e
return drivers.ErrTaskNotFound
}
- return h.Kill(timeout, signal)
+ err := h.Kill(timeout, signal)
+
+ os.Remove(GetGCRoot(d.config.GCRootsDir, h.task.Name, h.task.AllocID))
+
+ return err
}
func (d *Driver) DestroyTask(taskID string, force bool) error {
diff --git a/drivers/docker/nix.go b/drivers/docker/nix.go
new file mode 100644
index 000000000..426cc51fd
--- /dev/null
+++ b/drivers/docker/nix.go
@@ -0,0 +1,109 @@
+package docker
+
+import (
+ "fmt"
+ "os/exec"
+ "strings"
+ "encoding/json"
+)
+
+func NixGetDeps(executable string, flakeRef string) ([]string, error) {
+ nixDepsCmd := &exec.Cmd {
+ Path: executable,
+ Args: []string{
+ executable,
+ "path-info",
+ "-r",
+ flakeRef,
+ },
+ }
+ res, err := nixDepsCmd.Output()
+ if err != nil {
+ return nil, fmt.Errorf("failed to get dependencies of built flake-ref %s", flakeRef)
+ }
+ deps := strings.Split(strings.Trim(string(res), " \n"), "\n")
+
+ return deps, nil
+}
+
+func NixBuildFlake(executable string, flakeRef string, flakeSha string) error {
+
+ flakeHost := strings.Split(flakeRef, "#")
+
+ if len(flakeHost) != 2 {
+ return fmt.Errorf("Invalid flake ref.")
+ }
+
+ nixShaCmd := &exec.Cmd {
+ Path: executable,
+ Args: []string{
+ executable,
+ "flake",
+ "metadata",
+ "--json",
+ flakeHost[0],
+ },
+ }
+ nixSha, err := nixShaCmd.Output()
+ if err != nil {
+ return fmt.Errorf("failed to get sha for flake-ref %s with %s:\n %s", flakeRef, err, string(nixSha))
+ }
+
+ var shaJson map[string]interface{}
+ err = json.Unmarshal(nixSha, &shaJson)
+
+ if err != nil {
+ return fmt.Errorf("failed to parse json %s", err)
+ }
+
+ lockedVal, ok := shaJson["locked"].(map[string]interface{})
+ if !ok {
+ return fmt.Errorf("failed to parse `nix flake metadata` output")
+ }
+ fetchedSha, ok := lockedVal["narHash"].(string)
+ if !ok {
+ return fmt.Errorf("failed to parse `nix flake metadata` output")
+ }
+
+ if string(fetchedSha) != flakeSha {
+ return fmt.Errorf("pinned flake sha doesn't match: \"%s\" != \"%s\"", flakeSha, fetchedSha)
+ }
+
+ nixBuildCmd := &exec.Cmd {
+ Path: executable,
+ Args: []string{
+ executable,
+ "build",
+ "--no-link",
+ flakeRef,
+ },
+ }
+ res, err := nixBuildCmd.Output()
+ if err != nil {
+ return fmt.Errorf("failed to build flake-ref %s with %s:\n %s", flakeRef, err, string(res))
+ }
+
+ return nil
+}
+
+func NixGetStorePath(executable string, flakeRef string) (string, error) {
+ nixEvalCmd := exec.Cmd {
+ Path: executable,
+ Args: []string{
+ executable,
+ "eval",
+ "--raw",
+ flakeRef + ".outPath",
+ },
+ }
+
+ storePath, err := nixEvalCmd.Output()
+ if err != nil {
+ return "", fmt.Errorf("failed to get store path of %s", flakeRef)
+ }
+ return string(storePath), nil
+}
+
+func GetGCRoot(gcRootsDir string, containerName string, allocationId string) string {
+ return fmt.Sprintf("%s/%s-%s", gcRootsDir, containerName, allocationId)
+}
--
2.37.1
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