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package dockerfile2llb
import (
"context"
"os"
"path"
"path/filepath"
"github.com/moby/buildkit/client/llb"
"github.com/moby/buildkit/frontend/dockerfile/instructions"
"github.com/moby/buildkit/solver/pb"
"github.com/pkg/errors"
)
func detectRunMount(cmd *command, allDispatchStates *dispatchStates) bool {
if c, ok := cmd.Command.(*instructions.RunCommand); ok {
mounts := instructions.GetMounts(c)
sources := make([]*dispatchState, len(mounts))
for i, mount := range mounts {
var from string
if mount.From == "" {
// this might not be accurate because the type might not have a real source (tmpfs for instance),
// but since this is just for creating the sources map it should be ok (we don't want to check the value of
// mount.Type because it might be a variable)
from = emptyImageName
} else {
from = mount.From
}
stn, ok := allDispatchStates.findStateByName(from)
if !ok {
stn = &dispatchState{
stage: instructions.Stage{BaseName: from},
deps: make(map[*dispatchState]instructions.Command),
paths: make(map[string]struct{}),
unregistered: true,
}
}
sources[i] = stn
}
cmd.sources = sources
return true
}
return false
}
func setCacheUIDGID(m *instructions.Mount, st llb.State) llb.State {
uid := 0
gid := 0
mode := os.FileMode(0755)
if m.UID != nil {
uid = int(*m.UID)
}
if m.GID != nil {
gid = int(*m.GID)
}
if m.Mode != nil {
mode = os.FileMode(*m.Mode)
}
return st.File(llb.Mkdir("/cache", mode, llb.WithUIDGID(uid, gid)), llb.WithCustomName("[internal] settings cache mount permissions"))
}
func dispatchRunMounts(d *dispatchState, c *instructions.RunCommand, sources []*dispatchState, opt dispatchOpt) ([]llb.RunOption, error) {
var out []llb.RunOption
mounts := instructions.GetMounts(c)
for i, mount := range mounts {
if mount.From == "" && mount.Type == instructions.MountTypeCache {
mount.From = emptyImageName
}
st := opt.buildContext
if mount.From != "" {
src := sources[i]
st = src.state
if !src.noinit {
return nil, errors.Errorf("cannot mount from stage %q to %q, stage needs to be defined before current command", mount.From, mount.Target)
}
}
var mountOpts []llb.MountOption
if mount.Type == instructions.MountTypeTmpfs {
st = llb.Scratch()
mountOpts = append(mountOpts, llb.Tmpfs(
llb.TmpfsSize(mount.SizeLimit),
))
}
if mount.Type == instructions.MountTypeSecret {
secret, err := dispatchSecret(d, mount, c.Location())
if err != nil {
return nil, err
}
out = append(out, secret)
continue
}
if mount.Type == instructions.MountTypeSSH {
ssh, err := dispatchSSH(d, mount, c.Location())
if err != nil {
return nil, err
}
out = append(out, ssh)
continue
}
if mount.ReadOnly {
mountOpts = append(mountOpts, llb.Readonly)
} else if mount.Type == instructions.MountTypeBind && opt.llbCaps.Supports(pb.CapExecMountBindReadWriteNoOutput) == nil {
mountOpts = append(mountOpts, llb.ForceNoOutput)
}
if mount.Type == instructions.MountTypeCache {
sharing := llb.CacheMountShared
if mount.CacheSharing == instructions.MountSharingPrivate {
sharing = llb.CacheMountPrivate
}
if mount.CacheSharing == instructions.MountSharingLocked {
sharing = llb.CacheMountLocked
}
if mount.CacheID == "" {
mount.CacheID = path.Clean(mount.Target)
}
mountOpts = append(mountOpts, llb.AsPersistentCacheDir(opt.cacheIDNamespace+"/"+mount.CacheID, sharing))
}
target := mount.Target
if !filepath.IsAbs(filepath.Clean(mount.Target)) {
dir, err := d.state.GetDir(context.TODO())
if err != nil {
return nil, err
}
target = filepath.Join("/", dir, mount.Target)
}
if target == "/" {
return nil, errors.Errorf("invalid mount target %q", target)
}
if src := path.Join("/", mount.Source); src != "/" {
mountOpts = append(mountOpts, llb.SourcePath(src))
} else if mount.UID != nil || mount.GID != nil || mount.Mode != nil {
st = setCacheUIDGID(mount, st)
mountOpts = append(mountOpts, llb.SourcePath("/cache"))
}
out = append(out, llb.AddMount(target, st, mountOpts...))
if mount.From == "" {
d.ctxPaths[path.Join("/", filepath.ToSlash(mount.Source))] = struct{}{}
} else {
source := sources[i]
source.paths[path.Join("/", filepath.ToSlash(mount.Source))] = struct{}{}
}
}
return out, nil
}
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