Following up with more testing:
Given:
$ mkdir 'a \134053 b' 'a \053 b' 'a + b'
$ echo a > 'a \134053 b'/a
$ echo b > 'a \053 b'/b
$ echo c > 'a + b'/c
(henceforth dubbed a, b, c, respectively), such that, trivially:
$ ls -lR 'a \134053 b' 'a \053 b' 'a + b'
'a \053 b':
total 4
-rw-r--r-- 1 nabijaczleweli users 2 Mar 30 17:17 b
'a \134053 b':
total 4
-rw-r--r-- 1 nabijaczleweli users 2 Mar 30 17:17 a
'a + b':
total 4
-rw-r--r-- 1 nabijaczleweli users 2 Mar 30 17:17 c
And each is exported as such:
# exportfs -vo fsid=100 szarotka:'/tmp/a \134053 b'
# exportfs -vo fsid=200 szarotka:'/tmp/a \053 b'
# exportfs -vo fsid=300 szarotka:'/tmp/a + b'
exporting szarotka.nabijaczleweli.xyz:/tmp/a \134053 b
exporting szarotka.nabijaczleweli.xyz:/tmp/a \053 b
exporting szarotka.nabijaczleweli.xyz:/tmp/a + b
Then:
If only a is exported, the following state is achieved:
# exportfs
/tmp/a + b szarotka.nabijaczleweli.xyz
/mnt/filling/machine/1200-S121
<world>
# exportfs -s
/tmp/a\040+\040b szarotka.nabijaczleweli.xyz(ro,wdelay,root_squash,no_subtree_check,fsid=100,sec=sys,ro,secure,root_squash,no_all_squash)
/mnt/filling/machine/1200-S121 *(rw,async,wdelay,crossmnt,no_root_squash,no_subtree_check,mountpoint,sec=sys,rw,secure,no_root_squash,no_all_squash)
$ cat /var/lib/nfs/etab
/tmp/a\040\134134053\040b szarotka.nabijaczleweli.xyz(ro,sync,wdelay,hide,nocrossmnt,secure,root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,fsid=100,anonuid=65534,anongid=65534,sec=sys,ro,secure,root_squash,no_all_squash)
/mnt/filling/machine/1200-S121 *(rw,async,wdelay,hide,crossmnt,secure,no_root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,mountpoint,anonuid=65534,anongid=65534,sec=sys,rw,secure,no_root_squash,no_all_squash)
If then b is also exported, the following state is achieved:
# exportfs
/tmp/a + b szarotka.nabijaczleweli.xyz
/mnt/filling/machine/1200-S121
<world>
# exportfs -s
/tmp/a\040+\040b szarotka.nabijaczleweli.xyz(ro,wdelay,root_squash,no_subtree_check,fsid=100,sec=sys,ro,secure,root_squash,no_all_squash)
/mnt/filling/machine/1200-S121 *(rw,async,wdelay,crossmnt,no_root_squash,no_subtree_check,mountpoint,sec=sys,rw,secure,no_root_squash,no_all_squash)
$ cat /var/lib/nfs/etab
/tmp/a\040+\040b szarotka.nabijaczleweli.xyz(ro,sync,wdelay,hide,nocrossmnt,secure,root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,fsid=100,anonuid=65534,anongid=65534,sec=sys,ro,secure,root_squash,no_all_squash)
/tmp/a\040\134053\040b szarotka.nabijaczleweli.xyz(ro,sync,wdelay,hide,nocrossmnt,secure,root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,fsid=200,anonuid=65534,anongid=65534,sec=sys,ro,secure,root_squash,no_all_squash)
/mnt/filling/machine/1200-S121 *(rw,async,wdelay,hide,crossmnt,secure,no_root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,mountpoint,anonuid=65534,anongid=65534,sec=sys,rw,secure,no_root_squash,no_all_squash)
If then c is also exported, the following state is achieved:
# exportfs
/tmp/a + b szarotka.nabijaczleweli.xyz
/mnt/filling/machine/1200-S121
<world>
# exportfs -s
/tmp/a\040+\040b szarotka.nabijaczleweli.xyz(ro,wdelay,root_squash,no_subtree_check,fsid=300,sec=sys,ro,secure,root_squash,no_all_squash)
/mnt/filling/machine/1200-S121 *(rw,async,wdelay,crossmnt,no_root_squash,no_subtree_check,mountpoint,sec=sys,rw,secure,no_root_squash,no_all_squash)
$ cat /var/lib/nfs/etab
/tmp/a\040+\040b szarotka.nabijaczleweli.xyz(ro,sync,wdelay,hide,nocrossmnt,secure,root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,fsid=300,anonuid=65534,anongid=65534,sec=sys,ro,secure,root_squash,no_all_squash)
/mnt/filling/machine/1200-S121 *(rw,async,wdelay,hide,crossmnt,secure,no_root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,mountpoint,anonuid=65534,anongid=65534,sec=sys,rw,secure,no_root_squash,no_all_squash)
Note how a and b were folded into c(?) but not into each other,
which is especially concerning given, that, in /every/ case, regardless
which are exported:
szarotka$ mkdir a b c
szarotka# mount -t nfs tarta:'/tmp/a \134053 b' a
mount.nfs: mounting tarta:/tmp/a \134053 b failed, reason given by server: No such file or directory
szarotka# mount -t nfs tarta:'/tmp/a \053 b' b
mount.nfs: mounting tarta:/tmp/a \053 b failed, reason given by server: No such file or directory
szarotka# mount -t nfs tarta:'/tmp/a + b' c
nabijaczleweli@szarotka:/tmp$ l c
total 4.0K
-rw-r--r-- 1 nabijaczleweli users 2 Mar 30 17:17 c
This could be spun as an "accidental exposure" bug or w/e, but this is
primarily just insane. Or, if it's somehow expected and working as
intended, then it warrants a note in the manual, at least.
Best,
наб
Please keep me in CC, as I'm not subscribed.
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