55 lines
1.9 KiB
Plaintext
55 lines
1.9 KiB
Plaintext
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PURPOSE of /CoreOS/coreutils/readlink-cannot-handle-recursive-symlinks
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Description: Test for readlink cannot handle recursive symlinks
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Author: Jan Scotka <jscotka@redhat.com>
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Bug summary: readlink cannot handle recursive symlinks
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Description:
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Description of problem:
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The readlink command fails with an error "Too many levels of symbolic links", even if there are only 2 levels.
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The readlink command from RHEL 3 and RHEL 4 and from Fedora 11 all work fine.
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Among other changes between RHEL 4 and RHEL 5, RHEL 5's coreutils added calls to cycle_check() in lib/canonicalize.c, but in upstream canonicalize.c (now in gnulib instead of coreutils), we see the comment:
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/* Detect loops. We cannot use the cycle-check module here,
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since it's actually possible to encounter the same symlink
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more than once in a given traversal. However, encountering
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the same symlink,NAME pair twice does indicate a loop. */
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http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=lib/canonicalize.c;h=4f348398fd69ae516396313d18ac294a4ca3dde3;hb=b653eda3ac4864de205419d9f41eec267cb89eeb#l262
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The latest canonicalize.c uses seen_triple() instead of cycle_check().
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Version-Release number of selected component (if applicable):
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coreutils-5.97-19.el5
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How reproducible:
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every time
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Steps to Reproduce:
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1. Create a directory with a symlink to itself
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mkdir /tmp/dir
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cd /tmp/dir
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ln -s ../dir dirlink
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2. Run readlink using the 'dirlink' symlink recursively
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readlink -v -f dirlink
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readlink -v -f dirlink/dirlink
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readlink -v -f dirlink/dirlink/dirlink
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Actual results:
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The first readlink command on just dirlink succeeds, but the 2nd and 3rd commands fail with
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readlink: dirlink/dirlink: Too many levels of symbolic links
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Expected results:
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$ readlink -v -f dirlink
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/tmp/dir
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$ readlink -v -f dirlink/dirlink
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/tmp/dir
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$ readlink -v -f dirlink/dirlink/dirlink
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/tmp/dir
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Additional info:
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