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mountinfo: GetMountsFromReader() remove workaround for kernel < 3.10
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In Linux <= 3.9 mounting a cifs with spaces in a share name (like "//srv/My Docs")
_may_ end up having a space in the last field of mountinfo (like "unc=//serv/My Docs").

Since kernel 3.10-rc1, cifs option "unc=" is ignored, so spaces should not appear.

Given that all major distros are now on at least kernel 3.10, and (e.g.) docker
has not supported older kernel versions for 5 Years [1], it should be save to
remove this special handling.

[1]: moby/moby@51b23d8

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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@thaJeztah
thaJeztah committed Aug 23, 2021
1 parent 76a42cd commit 955e12d
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Showing 2 changed files with 6 additions and 82 deletions.
14 changes: 2 additions & 12 deletions mountinfo/mountinfo_linux.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -57,18 +57,8 @@ func GetMountsFromReader(r io.Reader, filter FilterFunc) ([]*Info, error) {

// separator field
sepIdx := numFields - 4
// In Linux <= 3.9 mounting a cifs with spaces in a share
// name (like "//srv/My Docs") _may_ end up having a space
// in the last field of mountinfo (like "unc=//serv/My Docs").
// Since kernel 3.10-rc1, cifs option "unc=" is ignored,
// so spaces should not appear.
//
// Check for a separator, and work around the spaces bug
for fields[sepIdx] != "-" {
sepIdx--
if sepIdx == 5 {
return nil, fmt.Errorf("parsing '%s' failed: missing - separator", text)
}
if fields[sepIdx] != "-" {
return nil, fmt.Errorf("parsing '%s' failed: missing - separator", text)
}

p := &Info{}
Expand Down
74 changes: 4 additions & 70 deletions mountinfo/mountinfo_linux_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -62,8 +62,7 @@ const (
235 35 253:32 / /var/lib/docker/devicemapper/mnt/1a28059f29eda821578b1bb27a60cc71f76f846a551abefabce6efd0146dce9f rw,relatime shared:217 - ext4 /dev/mapper/docker-253:2-425882-1a28059f29eda821578b1bb27a60cc71f76f846a551abefabce6efd0146dce9f rw,seclabel,discard,stripe=16,data=ordered
239 35 253:33 / /var/lib/docker/devicemapper/mnt/e9aa60c60128cad1 rw,relatime shared:221 - ext4 /dev/mapper/docker-253:2-425882-e9aa60c60128cad1 rw,seclabel,discard,stripe=16,data=ordered
243 35 253:34 / /var/lib/docker/devicemapper/mnt/5fec11304b6f4713fea7b6ccdcc1adc0a1966187f590fe25a8227428a8df275d-init rw,relatime shared:225 - ext4 /dev/mapper/docker-253:2-425882-5fec11304b6f4713fea7b6ccdcc1adc0a1966187f590fe25a8227428a8df275d-init rw,seclabel,discard,stripe=16,data=ordered
247 35 253:35 / /var/lib/docker/devicemapper/mnt/5fec11304b6f4713fea7b6ccdcc1adc0a1966187f590fe25a8227428a8df275d rw,relatime shared:229 - ext4 /dev/mapper/docker-253:2-425882-5fec11304b6f4713fea7b6ccdcc1adc0a1966187f590fe25a8227428a8df275d rw,seclabel,discard,stripe=16,data=ordered
31 21 0:23 / /DATA/foo_bla_bla rw,relatime - cifs //foo/BLA\040BLA\040BLA/ rw,sec=ntlm,cache=loose,unc=\\foo\BLA BLA BLA,username=my_login,domain=mydomain.com,uid=12345678,forceuid,gid=12345678,forcegid,addr=10.1.30.10,file_mode=0755,dir_mode=0755,nounix,rsize=61440,wsize=65536,actimeo=1`
247 35 253:35 / /var/lib/docker/devicemapper/mnt/5fec11304b6f4713fea7b6ccdcc1adc0a1966187f590fe25a8227428a8df275d rw,relatime shared:229 - ext4 /dev/mapper/docker-253:2-425882-5fec11304b6f4713fea7b6ccdcc1adc0a1966187f590fe25a8227428a8df275d rw,seclabel,discard,stripe=16,data=ordered`

ubuntuMountinfo = `15 20 0:14 / /sys rw,nosuid,nodev,noexec,relatime - sysfs sysfs rw
16 20 0:3 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw
Expand Down Expand Up @@ -418,10 +417,6 @@ const (
286 15 0:3631 / /var/lib/docker/aufs/mnt/ff28c27d5f894363993622de26d5dd352dba072f219e4691d6498c19bbbc15a9 rw,relatime - aufs none rw,si=9b4a7642265b339c
289 15 0:3634 / /var/lib/docker/aufs/mnt/aa128fe0e64fdede333aa48fd9de39530c91a9244a0f0649a3c411c61e372daa rw,relatime - aufs none rw,si=9b4a764012ada39c
99 15 8:33 / /media/REMOVE\040ME rw,nosuid,nodev,relatime - fuseblk /dev/sdc1 rw,user_id=0,group_id=0,allow_other,blksize=4096`

mountInfoWithSpaces = `486 28 252:1 / /mnt/foo\040bar rw,relatime shared:243 - ext4 /dev/vda1 rw,data=ordered
31 21 0:23 / /DATA/foo_bla_bla rw,relatime - cifs //foo/BLA\040BLA\040BLA/ rw,sec=ntlm,cache=loose,unc=\\foo\BLA BLA BLA,username=my_login,domain=mydomain.com,uid=12345678,forceuid,gid=12345678,forcegid,addr=10.1.30.10,file_mode=0755,dir_mode=0755,nounix,rsize=61440,wsize=65536,actimeo=1
649 94 259:5 /tmp/newline\012tab\011space\040backslash\134quote1'quote2" /tmp/newline\012tab\011space\040backslash\134quote1'quote2" rw,relatime shared:47 - ext4 /dev/nvme0n1p5 rw,seclabel`
)

func TestParseMountInfo(t *testing.T) {
Expand Down Expand Up @@ -531,66 +526,6 @@ func TestParseFedoraMountinfoFilterFields(t *testing.T) {
}
}

func TestParseMountinfoWithSpaces(t *testing.T) {
r := bytes.NewBuffer([]byte(mountInfoWithSpaces))
infos, err := GetMountsFromReader(r, nil)
if err != nil {
t.Fatal(err)
}
expected := []Info{
{
ID: 486,
Parent: 28,
Major: 252,
Minor: 1,
Root: "/",
Mountpoint: "/mnt/foo bar",
Options: "rw,relatime",
Optional: "shared:243",
FSType: "ext4",
Source: "/dev/vda1",
VFSOptions: "rw,data=ordered",
},
{
ID: 31,
Parent: 21,
Major: 0,
Minor: 23,
Root: "/",
Mountpoint: "/DATA/foo_bla_bla",
Options: "rw,relatime",
Optional: "",
FSType: "cifs",
Source: `//foo/BLA BLA BLA/`,
VFSOptions: `rw,sec=ntlm,cache=loose,unc=\\foo\BLA`,
},
{
ID: 649,
Parent: 94,
Major: 259,
Minor: 5,
Root: `/tmp/newline
tab space backslash\quote1'quote2"`,
Mountpoint: `/tmp/newline
tab space backslash\quote1'quote2"`,
Options: "rw,relatime",
Optional: "shared:47",
FSType: "ext4",
Source: `/dev/nvme0n1p5`,
VFSOptions: `rw,seclabel`,
},
}

if len(infos) != len(expected) {
t.Fatalf("expected %d entries, got %d", len(expected), len(infos))
}
for i, mi := range expected {
if *infos[i] != mi {
t.Fatalf("expected %#v, got %#v", mi, infos[i])
}
}
}

func TestParseMountinfoFilters(t *testing.T) {
cases := []struct {
filter FilterFunc
Expand Down Expand Up @@ -667,10 +602,9 @@ func TestParseMountinfoExtraCases(t *testing.T) {
valid: false,
},
{
name: "extra fields at the end", // which we currently discard
entry: `251 15 0:3573 / /mnt/point rw,relatime - aufs none rw,unc=buggy but we cope`,
valid: true,
exp: &Info{Mountpoint: "/mnt/point", FSType: "aufs", Source: "none"},
name: "extra fields at the end (kernel < 3.10 bug)",
entry: `251 15 0:3573 / /mnt/point rw,relatime - aufs none rw,unc=buggy pre-kernel 3.10 data`,
valid: false,
},
{
name: "one optional field",
Expand Down

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