github.com/alibaba/sealer@v0.8.6-0.20220430115802-37a2bdaa8173/build/buildinstruction/cmd.go (about)

     1  // Copyright © 2021 Alibaba Group Holding Ltd.
     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 buildinstruction
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/alibaba/sealer/utils/mount"
    21  
    22  	"github.com/moby/buildkit/frontend/dockerfile/shell"
    23  
    24  	"github.com/alibaba/sealer/utils"
    25  
    26  	"github.com/opencontainers/go-digest"
    27  
    28  	"github.com/alibaba/sealer/common"
    29  	"github.com/alibaba/sealer/logger"
    30  	"github.com/alibaba/sealer/pkg/command"
    31  	"github.com/alibaba/sealer/pkg/image/cache"
    32  	v1 "github.com/alibaba/sealer/types/api/v1"
    33  )
    34  
    35  type CmdInstruction struct {
    36  	cmdValue string
    37  	rawLayer v1.Layer
    38  	mounter  mount.Service
    39  	ex       *shell.Lex
    40  }
    41  
    42  func (c CmdInstruction) Exec(execContext ExecContext) (out Out, err error) {
    43  	var (
    44  		hitCache bool
    45  		chainID  cache.ChainID
    46  		layerID  digest.Digest
    47  	)
    48  	defer func() {
    49  		out.ContinueCache = hitCache
    50  		out.ParentID = chainID
    51  	}()
    52  
    53  	if execContext.ContinueCache {
    54  		hitCache, layerID, chainID = tryCache(execContext.ParentID, c.rawLayer, execContext.CacheSvc, execContext.Prober, "")
    55  		if hitCache {
    56  			out.LayerID = layerID
    57  			return out, nil
    58  		}
    59  	}
    60  
    61  	err = c.mounter.TempMount()
    62  	if err != nil {
    63  		return out, err
    64  	}
    65  	defer c.mounter.CleanUp()
    66  
    67  	err = utils.SetRootfsBinToSystemEnv(c.mounter.GetMountTarget())
    68  	if err != nil {
    69  		return out, fmt.Errorf("failed to set temp rootfs %s to system $PATH : %v", c.mounter.GetMountTarget(), err)
    70  	}
    71  
    72  	// if no variable at cmd value,nothing will change.
    73  	// if no build args is matched at cmd value,then the variable will be null.
    74  	cmdline, err := c.ex.ProcessWordWithMap(c.cmdValue, execContext.BuildArgs)
    75  	if err != nil {
    76  		return out, fmt.Errorf("failed to render build args: %v", err)
    77  	}
    78  
    79  	cmd := fmt.Sprintf(common.CdAndExecCmd, c.mounter.GetMountTarget(), cmdline)
    80  	output, err := command.NewSimpleCommand(cmd).Exec()
    81  	logger.Info(output)
    82  
    83  	if err != nil {
    84  		return out, fmt.Errorf("failed to exec %s, err: %v", cmd, err)
    85  	}
    86  
    87  	// cmd do not contain layer ,so no need to calculate layer
    88  	if c.rawLayer.Type == common.CMDCOMMAND {
    89  		return out, nil
    90  	}
    91  
    92  	out.LayerID, err = execContext.LayerStore.RegisterLayerForBuilder(c.mounter.GetMountUpper())
    93  	return out, err
    94  }
    95  
    96  func NewCmdInstruction(ctx InstructionContext) (*CmdInstruction, error) {
    97  	lowerLayers := GetBaseLayersPath(ctx.BaseLayers)
    98  	mountService, err := mount.NewMountService("", "", lowerLayers)
    99  	if err != nil {
   100  		return nil, err
   101  	}
   102  
   103  	return &CmdInstruction{
   104  		mounter:  mountService,
   105  		cmdValue: ctx.CurrentLayer.Value,
   106  		rawLayer: *ctx.CurrentLayer,
   107  		ex:       shell.NewLex('\\'),
   108  	}, nil
   109  }