bruce@cs.su.oz (Bruce Janson) (04/30/91)
Summary:
"cpio -pdm" sometimes fails to create empty directories.
Repeat by:
$ uname -a
joyce joyce 4_52 UMIPS mips
$ id
uid=0(root) gid=0(root)
$ cd /tmp; mkdir t f f/a f/a/b; cd f
$ find . -depth -print | cpio -pdm ../t
cpio: WARNING: Cannot change the mode of file "../t/a/b" to 16877.
cpio: WARNING: Cannot change owner to 0 and group to 0 for file "../t/a/b".
0 blocks
$
Fix by:
?
Further detail:
Here's a trace of the file system calls executed by the
offending cpio from the above example:
..
18754:sysv_umask(0x0) = 0x12
18754:sysv_umask(0x0) = 0x0
..
18754:sysv_access("../t", 0x2) = 0
18754:sysv_stat("../t", {st_dev=0x101c, st_ino=2048, st_mode=0x41ed, st_nlink=2, st_uid=0, st_gid=0, st_rdev=0x1868, st_size=512, st_atime=673029105, st_mtime=673029106, st_ctime=673029106,}) = 0
..
18754:sysv_ioctl(0, TCGETA, {c_iflag=, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0, c_cflag=B0|CS5, c_lflag=, c_line=0, c_cc=[VINTR=0x00,VQUIT=0x00,VERASE=0x00,VKILL=0x00,VEOF=0x00,VEOL=0x00,VEOL2=0x00,VSWTCH=0x00,V_START=0x00,V_STOP=0x00,V_SUSP=0x00,V_DSUSP=0x00,V_RPRNT=0x00,V_FLUSH=0x00,V_WERAS=0x00,V_LNEXT=0x00,V_STATUS=0x40,V_SAVED_EOF=0x8a,V_SAVED_EOL=0xac,19=0x00,20=0x00,21=0x00,22=0x00,], c_saved_flags=0x0, c_filler=0x20}) = -1 ENOTTY (Not a character device)
18754:sysv_read(0, "./a/b\012./a\012.\012", 4096) = 12
18754:sysv_lstat("a/b", {st_dev=0x101c, st_ino=8192, st_mode=0x41ed, st_nlink=2, st_uid=0, st_gid=0, st_rdev=0x6188, st_size=512, st_atime=673029107, st_mtime=673029106, st_ctime=673029106,}) = 0
18754:sysv_stat("../t/a/b", {st_dev=0x0, st_ino=3, st_mode=0x41ed, st_nlink=2, st_uid=0, st_gid=0, st_rdev=0x1868, st_size=512, st_atime=673029105, st_mtime=673029106, st_ctime=673029106,}) = -1 ENOENT (No such file or directory)
18754:sysv_umask(0x12) = 0x0
18754:sysv_mkdir("../t/a/b", 0x1ff) = -1 ENOENT (No such file or directory)
18754:sysv_umask(0x0) = 0x12
18754:sysv_chmod("../t/a/b", 0x41ed) = -1 ENOENT (No such file or directory)
18754:sysv_write(2, "c", 1) = 1
18754:sysv_write(2, "p", 1) = 1
18754:sysv_write(2, "i", 1) = 1
18754:sysv_write(2, "o", 1) = 1
18754:sysv_write(2, ":", 1) = 1
18754:sysv_write(2, " ", 1) = 1
18754:sysv_write(2, "WARNING: ", 9) = 9
..
18754:sysv_chown("../t/a/b", 0, 0) = -1 ENOENT (No such file or directory)
18754:sysv_write(2, "c", 1) = 1
18754:sysv_write(2, "p", 1) = 1
18754:sysv_write(2, "i", 1) = 1
18754:sysv_write(2, "o", 1) = 1
18754:sysv_write(2, ":", 1) = 1
18754:sysv_write(2, " ", 1) = 1
18754:sysv_write(2, "WARNING: ", 9) = 9
..
18754:sysv_utime("../t/a/b", 0x10005550) = -1 ENOENT (No such file or directory)
18754:sysv_lstat("a", {st_dev=0x101c, st_ino=6144, st_mode=0x41ed, st_nlink=3, st_uid=0, st_gid=0, st_rdev=0x4928, st_size=512, st_atime=673029107, st_mtime=673029106, st_ctime=673029106,}) = 0
18754:sysv_stat("../t/a", {st_dev=0x0, st_ino=3, st_mode=0x41ed, st_nlink=2, st_uid=0, st_gid=0, st_rdev=0x1868, st_size=512, st_atime=673029105, st_mtime=673029106, st_ctime=673029106,}) = -1 ENOENT (No such file or directory)
18754:sysv_umask(0x12) = 0x0
18754:sysv_mkdir("../t/a", 0x1ff) = 0
18754:sysv_stat("..", {st_dev=0x101c, st_ino=2, st_mode=0x41ff, st_nlink=5, st_uid=2, st_gid=3, st_rdev=0x130, st_size=1536, st_atime=673029107, st_mtime=673029107, st_ctime=673029107,}) = 0
18754:sysv_stat("../t", {st_dev=0x101c, st_ino=2048, st_mode=0x41ed, st_nlink=3, st_uid=0, st_gid=0, st_rdev=0x1868, st_size=512, st_atime=673029105, st_mtime=673029112, st_ctime=673029112,}) = 0
18754:sysv_mkdir("../t/a", 0x1ff) = -1 EEXIST (File exists)
18754:sysv_umask(0x0) = 0x12
18754:sysv_chmod("../t/a", 0x41ed) = 0
18754:sysv_chown("../t/a", 0, 0) = 0
18754:sysv_utime("../t/a", 0x10005550) = 0
18754:sysv_lstat(".", {st_dev=0x101c, st_ino=4096, st_mode=0x41ed, st_nlink=3, st_uid=0, st_gid=0, st_rdev=0x30c8, st_size=512, st_atime=673029107, st_mtime=673029106, st_ctime=673029106,}) = 0
18754:sysv_stat("../t/.", {st_dev=0x101c, st_ino=2048, st_mode=0x41ed, st_nlink=3, st_uid=0, st_gid=0, st_rdev=0x1868, st_size=512, st_atime=673029105, st_mtime=673029112, st_ctime=673029112,}) = 0
18754:sysv_chmod("../t/.", 0x41ed) = 0
18754:sysv_chown("../t/.", 0, 0) = 0
18754:sysv_utime("../t/.", 0x10005550) = 0
18754:sysv_read(0, "", 4096) = 0
18754:sysv_write(2, "0", 1) = 1
18754:sysv_write(2, " ", 1) = 1
18754:sysv_write(2, "b", 1) = 1
18754:sysv_write(2, "l", 1) = 1
18754:sysv_write(2, "o", 1) = 1
18754:sysv_write(2, "c", 1) = 1
18754:sysv_write(2, "k", 1) = 1
18754:sysv_write(2, "s", 1) = 1
18754:sysv_write(2, "\012", 1) = 1
18754:sysv_close(0) = 0
18754:sysv_close(1) = 0
18754:sysv_close(2) = 0
Cheers,
bruce.
Bruce Janson Email: bruce@cs.su.oz.au
Basser Department of Computer Science Phone: +61-2-692-3272
University of Sydney, N.S.W., 2006, AUSTRALIA Fax: +61-2-692-3838trevc@tecate.mips.com (Trevor Cotton) (05/01/91)
In article <2368@cluster.cs.su.oz.au>, bruce@cs.su.oz (Bruce Janson) writes: |> Summary: |> "cpio -pdm" sometimes fails to create empty directories. |> |> Repeat by: |> $ uname -a |> joyce joyce 4_52 UMIPS mips |> $ id |> uid=0(root) gid=0(root) |> $ cd /tmp; mkdir t f f/a f/a/b; cd f |> $ find . -depth -print | cpio -pdm ../t |> cpio: WARNING: Cannot change the mode of file "../t/a/b" to 16877. |> cpio: WARNING: Cannot change owner to 0 and group to 0 for file "../t/a/b". |> 0 blocks |> $ Because the -depth option to find is used, cpio will be fed ./a/b and then ./a Because the -d option to cpio is used, it will try and create the needed directory 'a' first. The problem is that cpio is doing a if (!mkdir(namep, df_mode)) { When trying to create the directory ../t/a mkdir returns 0 on success, -1 on failure which means that cpio thinks it managed to create the directory when it did not. The reason it gives the "Cannot change the mode of file "../t/a/b" to 16877." error message is actually because ../t/a/b does not exist. Changing the offending line of code to if (mkdir(namep, df_mode) == -1) { cures the problem. I will make sure that a bug report is submitted so that we can get this fixed in the next release. -- --trevc-- Trevor Cotton, Sustaining Engineering, MIPS Computer Systems Inc. MS 6-05, 930 DeGuigne Drive, Sunnyvale, CA 94088-3650 Tel: +1 408 524 7286 Fax: +1 408 524 7521 Email: {wyse,ames,decwrl,pyramid}!mips!trevc trevc@mips.com