github.com/stackdocker/rkt@v0.10.1-0.20151109095037-1aa827478248/stage1/init/common/mount.go (about)

     1  // Copyright 2015 The rkt Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package common
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/coreos/rkt/Godeps/_workspace/src/github.com/appc/spec/schema"
    21  	"github.com/coreos/rkt/Godeps/_workspace/src/github.com/appc/spec/schema/types"
    22  )
    23  
    24  func isMPReadOnly(mountPoints []types.MountPoint, name types.ACName) bool {
    25  	for _, mp := range mountPoints {
    26  		if mp.Name == name {
    27  			return mp.ReadOnly
    28  		}
    29  	}
    30  
    31  	return false
    32  }
    33  
    34  // IsMountReadOnly returns if a mount should be readOnly.
    35  // If the readOnly flag in the pod manifest is not nil, it overrides the
    36  // readOnly flag in the image manifest.
    37  func IsMountReadOnly(vol types.Volume, mountPoints []types.MountPoint) bool {
    38  	if vol.ReadOnly != nil {
    39  		return *vol.ReadOnly
    40  	}
    41  
    42  	return isMPReadOnly(mountPoints, vol.Name)
    43  }
    44  
    45  func GenerateMounts(ra *schema.RuntimeApp, volumes map[types.ACName]types.Volume) ([]schema.Mount, error) {
    46  	appName := ra.Name
    47  	id := ra.Image.ID
    48  	app := ra.App
    49  
    50  	mnts := make(map[string]schema.Mount)
    51  	for _, m := range ra.Mounts {
    52  		mnts[m.Path] = m
    53  	}
    54  
    55  	for _, mp := range app.MountPoints {
    56  		// there's already an injected mount for this target path, skip
    57  		if _, ok := mnts[mp.Path]; ok {
    58  			continue
    59  		}
    60  		vol, ok := volumes[mp.Name]
    61  		if !ok {
    62  			catCmd := fmt.Sprintf("sudo rkt image cat-manifest --pretty-print %v", id)
    63  			volumeCmd := ""
    64  			for _, mp := range app.MountPoints {
    65  				volumeCmd += fmt.Sprintf("--volume %s,kind=host,source=/some/path ", mp.Name)
    66  			}
    67  
    68  			return nil, fmt.Errorf("no volume for mountpoint %q:%q in app %q.\n"+
    69  				"You can inspect the volumes with:\n\t%v\n"+
    70  				"App %q requires the following volumes:\n\t%v",
    71  				mp.Name, mp.Path, appName, catCmd, appName, volumeCmd)
    72  		}
    73  		ra.Mounts = append(ra.Mounts, schema.Mount{Volume: vol.Name, Path: mp.Path})
    74  	}
    75  
    76  	return ra.Mounts, nil
    77  }