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Fix to detect unformatted volumes in CoreOS

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The `file` command used here to check whether a device is formatted is not
available for CoreOS. The effect is that the mounter tries to mount an
unformatted volume which fails. This makes it quite tedious to use persistent
volumes in CoreOS.

This patch replaces the `file` command with `lsblk` which is available in
CoreOS. I checked that it's also available on RHEL, Debian, Ubuntu and SLES.
This commit is contained in:
Michael Schmidt
2015-09-17 15:23:04 +02:00
parent 81d3bd9a36
commit 57f89da69a
2 changed files with 9 additions and 8 deletions
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7
pkg/util/mount/mount.go
View File

@@ -98,9 +98,10 @@ func (mounter *SafeFormatAndMount) formatAndMount(source string, target string,
// diskLooksUnformatted uses 'file' to see if the given disk is unformated
func (mounter *SafeFormatAndMount) diskLooksUnformatted(disk string) (bool, error) {
args := []string{"-L", "--special-files", disk}
cmd := mounter.Runner.Command("file", args...)
args := []string{"-nd", "-o", "FSTYPE", disk}
cmd := mounter.Runner.Command("lsblk", args...)
dataOut, err := cmd.CombinedOutput()
output := strings.TrimSpace(string(dataOut))
// TODO (#13212): check if this disk has partitions and return false, and
// an error if so.
@@ -109,7 +110,7 @@ func (mounter *SafeFormatAndMount) diskLooksUnformatted(disk string) (bool, erro
return false, err
}
return !strings.Contains(string(dataOut), "filesystem"), nil
return output == "", nil
}
// New returns a mount.Interface for the current system.

10
pkg/util/mount/safe_format_and_mount_test.go
View File

@@ -65,7 +65,7 @@ func TestSafeFormatAndMount(t *testing.T) {
fstype: "ext4",
mountErrs: []error{fmt.Errorf("unknown filesystem type '(null)'")},
execScripts: []ExecArgs{
{"file", []string{"-L", "--special-files", "/dev/foo"}, "ext4 filesystem", nil},
{"lsblk", []string{"-nd", "-o", "FSTYPE", "/dev/foo"}, "ext4", nil},
},
expectedError: fmt.Errorf("unknown filesystem type '(null)'"),
},
@@ -73,7 +73,7 @@ func TestSafeFormatAndMount(t *testing.T) {
fstype: "ext4",
mountErrs: []error{fmt.Errorf("unknown filesystem type '(null)'")},
execScripts: []ExecArgs{
{"file", []string{"-L", "--special-files", "/dev/foo"}, "data", nil},
{"lsblk", []string{"-nd", "-o", "FSTYPE", "/dev/foo"}, "", nil},
{"mkfs.ext4", []string{"-E", "lazy_itable_init=0,lazy_journal_init=0", "-F", "/dev/foo"}, "", fmt.Errorf("formatting failed")},
},
expectedError: fmt.Errorf("formatting failed"),
@@ -82,7 +82,7 @@ func TestSafeFormatAndMount(t *testing.T) {
fstype: "ext4",
mountErrs: []error{fmt.Errorf("unknown filesystem type '(null)'"), fmt.Errorf("Still cannot mount")},
execScripts: []ExecArgs{
{"file", []string{"-L", "--special-files", "/dev/foo"}, "data", nil},
{"lsblk", []string{"-nd", "-o", "FSTYPE", "/dev/foo"}, "", nil},
{"mkfs.ext4", []string{"-E", "lazy_itable_init=0,lazy_journal_init=0", "-F", "/dev/foo"}, "", nil},
},
expectedError: fmt.Errorf("Still cannot mount"),
@@ -91,7 +91,7 @@ func TestSafeFormatAndMount(t *testing.T) {
fstype: "ext4",
mountErrs: []error{fmt.Errorf("unknown filesystem type '(null)'"), nil},
execScripts: []ExecArgs{
{"file", []string{"-L", "--special-files", "/dev/foo"}, "data", nil},
{"lsblk", []string{"-nd", "-o", "FSTYPE", "/dev/foo"}, "", nil},
{"mkfs.ext4", []string{"-E", "lazy_itable_init=0,lazy_journal_init=0", "-F", "/dev/foo"}, "", nil},
},
expectedError: nil,
@@ -100,7 +100,7 @@ func TestSafeFormatAndMount(t *testing.T) {
fstype: "ext3",
mountErrs: []error{fmt.Errorf("unknown filesystem type '(null)'"), nil},
execScripts: []ExecArgs{
{"file", []string{"-L", "--special-files", "/dev/foo"}, "data", nil},
{"lsblk", []string{"-nd", "-o", "FSTYPE", "/dev/foo"}, "", nil},
{"mkfs.ext3", []string{"-E", "lazy_itable_init=0,lazy_journal_init=0", "-F", "/dev/foo"}, "", nil},
},
expectedError: nil,