github.com/crowdsecurity/crowdsec@v1.6.1/pkg/cwhub/itemlink.go (about)

     1  package cwhub
     2  
     3  import (
     4  	"fmt"
     5  	"os"
     6  	"path/filepath"
     7  )
     8  
     9  // createInstallLink creates a symlink between the actual config file at hub.HubDir and hub.ConfigDir.
    10  func (i *Item) createInstallLink() error {
    11  	dest, err := i.installPath()
    12  	if err != nil {
    13  		return err
    14  	}
    15  
    16  	destDir := filepath.Dir(dest)
    17  	if err = os.MkdirAll(destDir, os.ModePerm); err != nil {
    18  		return fmt.Errorf("while creating %s: %w", destDir, err)
    19  	}
    20  
    21  	if _, err = os.Lstat(dest); !os.IsNotExist(err) {
    22  		i.hub.logger.Infof("%s already exists.", dest)
    23  		return nil
    24  	}
    25  
    26  	src, err := i.downloadPath()
    27  	if err != nil {
    28  		return err
    29  	}
    30  
    31  	if err = os.Symlink(src, dest); err != nil {
    32  		return fmt.Errorf("while creating symlink from %s to %s: %w", src, dest, err)
    33  	}
    34  
    35  	return nil
    36  }
    37  
    38  // removeInstallLink removes the symlink to the downloaded content.
    39  func (i *Item) removeInstallLink() error {
    40  	syml, err := i.installPath()
    41  	if err != nil {
    42  		return err
    43  	}
    44  
    45  	stat, err := os.Lstat(syml)
    46  	if err != nil {
    47  		return err
    48  	}
    49  
    50  	// if it's managed by hub, it's a symlink to csconfig.GConfig.hub.HubDir / ...
    51  	if stat.Mode()&os.ModeSymlink == 0 {
    52  		i.hub.logger.Warningf("%s (%s) isn't a symlink, can't disable", i.Name, syml)
    53  		return fmt.Errorf("%s isn't managed by hub", i.Name)
    54  	}
    55  
    56  	hubpath, err := os.Readlink(syml)
    57  	if err != nil {
    58  		return fmt.Errorf("while reading symlink: %w", err)
    59  	}
    60  
    61  	src, err := i.downloadPath()
    62  	if err != nil {
    63  		return err
    64  	}
    65  
    66  	if hubpath != src {
    67  		i.hub.logger.Warningf("%s (%s) isn't a symlink to %s", i.Name, syml, src)
    68  		return fmt.Errorf("%s isn't managed by hub", i.Name)
    69  	}
    70  
    71  	if err := os.Remove(syml); err != nil {
    72  		return fmt.Errorf("while removing symlink: %w", err)
    73  	}
    74  
    75  	i.hub.logger.Infof("Removed symlink [%s]: %s", i.Name, syml)
    76  
    77  	return nil
    78  }