blkid returns 0 without output when running as non-root user
and when the cache /dev/.blkid.tab is not yet there:
./blkid /dev/sdb3 ; echo $?
0
That's the strace:
open("/dev/.blkid.tab", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
access("/dev/sdb3", F_OK) = 0
stat("/dev/sdb3", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 19), ...}) = 0
open("/dev/sdb3", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
stat("/dev/.blkid.tab", 0x7fff2b7cc990) = -1 ENOENT (No such file or directory)
open("/dev/.blkid.tab", O_WRONLY|O_CREAT|O_TRUNC, 0666) = -1 EACCES (Permission denied)
close(1) = 0
close(2) = 0
exit_group(0) = ?
I'd have expected either an error message along with exit code 1,
or success with some useful output.
After the cache exists, it's fine:
./blkid /dev/sdb3 ; echo $?
/dev/sdb3: LABEL="home" UUID="41ec7daa-46c3-4f19-aea0-e2c1679bb557" TYPE="ext3"
0
And another issue: blkid segfaults with this - okay, bad use of options:
./blkid -n /dev/sdb3
Segmentation fault
Backtrace:
(gdb) bt
#0 0x00007ff64fe72121 in __strlen_sse2 () from /lib64/libc.so.6
#1 0x00007ff65039029b in blkid_dev_set_search (iter=0x6090c0, search_type=0x0, search_value=0x0) at
libblkid/src/dev.c:151
#2 0x00000000004036e8 in main (argc=<optimized out>, argv=<optimized out>) at misc-utils/blkid.c:925
Using latest git; it doesn't dump core with 2.20.1.
Have a nice day,
Berny
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