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svnlook error message may end up in repos/db/nodes

From: Roman Neuhauser <neuhauser_at_chello.cz>
Date: 2004-06-30 00:19:13 CEST

I managed to destroy a repository by fooling around with svnlook's
stdout and stderr:

roman@isis ~/tmp 1048:0 > rm -fr wc repos
roman@isis ~/tmp 1049:0 > svnadmin create ./repos
roman_at_isis ~/tmp 1050:0 > (cd import; svn import . file:///home/roman/tmp/repos --message 'Initial repository layout')
Adding foo

Committed revision 1.
roman_at_isis ~/tmp 1051:0 > svn co file:///home/roman/tmp/repos wc
A wc/foo
Checked out revision 1.
roman@isis ~/tmp 1052:0 > cd wc
roman@isis ~/tmp/wc 1053:0 > echo '2' >|foo
roman@isis ~/tmp/wc 1054:0 > cat foo
2
roman@isis ~/tmp/wc 1055:0 > svn ci -m fubar
Sending foo
Transmitting file data .
Committed revision 2.
roman@isis ~/tmp/wc 1056:0 > svnlook diff -r 2 /home/roman/tmp/repos
Modified: foo
(...)
roman@isis ~/tmp/wc 1057:0 > svnlook diff -r 2 /home/roman/tmp/repos >&- 2>&-
roman@isis ~/tmp/wc 1058:1 > svnlook diff -r 2 /home/roman/tmp/repos
Modified: foo
(...)
roman@isis ~/tmp/wc 1059:0 > svnlook diff -r 2 /home/roman/tmp/repos >&-
svn: Can't write to stream: Bad file descriptor
roman@isis ~/tmp/wc 1060:1 > svnlook diff -r 2 /home/roman/tmp/repos
Modified: foo
(...)
roman@isis ~/tmp/wc 1061:0 > svnlook diff -r 2 /home/roman/tmp/repos >&- 2>&-
roman@isis ~/tmp/wc 1062:1 > svnlook diff -r 2 /home/roman/tmp/repos
Modified: foo
(...)
roman@isis ~/tmp/wc 1063:0 > svnlook diff -r 2 /home/roman/tmp/repos 2>&-
Modified: foo
(...)
roman@isis ~/tmp/wc 1064:0 > svnlook diff -r 2 /home/roman/tmp/repos >&- 2>&1
zsh: 1: bad file descriptor
roman@isis ~/tmp/wc 1065:1 > svnlook diff -r 2 /home/roman/tmp/repos >&- 2>&-
roman@isis ~/tmp/wc 1066:1 > svnlook diff -r 2 /home/roman/tmp/repos
svn: Berkeley DB error while opening 'nodes' table for filesystem /home/roman/tmp/repos/db:
Invalid argument
roman@isis ~/tmp/wc 1067:1 > head -1 ../repos/db/nodes
svn: Can't write to stream: Bad file descriptor

the above doesn't seem to be a reliable trigger, but getting the text in
the db/nodes file is just a matter of the number of tries; perhaps there
is a race somewhere?

this was achieved on FreeBSD 4.10-STABLE i386 with these versions:

roman@isis ~/tmp/wc 1198:0 > ldd $(which svnlook)
/usr/local/bin/svnlook:
        libsvn_repos-1.so.0 => /usr/local/lib/libsvn_repos-1.so.0 (0x2806d000)
        libsvn_fs-1.so.0 => /usr/local/lib/libsvn_fs-1.so.0 (0x2807e000)
        libsvn_delta-1.so.0 => /usr/local/lib/libsvn_delta-1.so.0 (0x2809a000)
        libsvn_diff-1.so.0 => /usr/local/lib/libsvn_diff-1.so.0 (0x280a1000)
        libsvn_subr-1.so.0 => /usr/local/lib/libsvn_subr-1.so.0 (0x280a8000)
        libaprutil-0.so.9 => /usr/local/lib/libaprutil-0.so.9 (0x280c6000)
        libdb4.so.0 => /usr/local/lib/libdb4.so.0 (0x280da000)
        libexpat.so.5 => /usr/local/lib/libexpat.so.5 (0x28160000)
        libiconv.so.3 => /usr/local/lib/libiconv.so.3 (0x2817d000)
        libapr-0.so.9 => /usr/local/lib/libapr-0.so.9 (0x2826a000)
        libm.so.2 => /usr/lib/libm.so.2 (0x28288000)
        libcrypt.so.2 => /usr/lib/libcrypt.so.2 (0x282a4000)
        libc_r.so.4 => /usr/lib/libc_r.so.4 (0x282be000)
roman@isis ~/tmp/wc 1199:0 > ldd $(which svnlook)|awk '/=>/{print $3}'|while read l; do echo -n "$l: "; pkg_which $l; done
/usr/local/lib/libsvn_repos-1.so.0: subversion-1.0.5
/usr/local/lib/libsvn_fs-1.so.0: subversion-1.0.5
/usr/local/lib/libsvn_delta-1.so.0: subversion-1.0.5
/usr/local/lib/libsvn_diff-1.so.0: subversion-1.0.5
/usr/local/lib/libsvn_subr-1.so.0: subversion-1.0.5
/usr/local/lib/libaprutil-0.so.9: apr-db4-0.9.4_9
/usr/local/lib/libdb4.so.0: db4-4.0.14_1,1
/usr/local/lib/libexpat.so.5: expat-1.95.7
/usr/local/lib/libiconv.so.3: libiconv-1.9.1_3
/usr/local/lib/libapr-0.so.9: apr-db4-0.9.4_9
/usr/lib/libm.so.2: ?
/usr/lib/libcrypt.so.2: ?
/usr/lib/libc_r.so.4: ?

let me know if you need more information.

-- 
FreeBSD 4.10-STABLE
12:08AM up 15:03, 5 users, load averages: 0.01, 0.01, 0.00
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Received on Wed Jun 30 00:26:30 2004

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