Package: zsh
Version: 4.3.10-17
Severity: normal
Consider the following zsh script:
d=$PWD:t
ln -s . symlink-to-dot || exit 1
realpath symlink-to-dot/../$d/symlink-to-dot
realpath symlink-to-dot/../$d/does-not-exist
echo symlink-to-dot/../$d/symlink-to-dot(:A)
echo symlink-to-dot/../$d/does-not-exist(:A)
echo symlink-to-dot/../$d/symlink-to-dot(:a)
echo symlink-to-dot/../$d/does-not-exist(:a)
rm symlink-to-dot
When run under some /tmp/foo directory, one gets:
/tmp/foo
symlink-to-dot/../foo/does-not-exist: No such file or directory
/tmp/foo/foo/symlink-to-dot
no matches found: symlink-to-dot/../foo/does-not-exist(:A)
/tmp/foo/foo/symlink-to-dot
no matches found: symlink-to-dot/../foo/does-not-exist(:a)
How the path is resolved should be clarified, in particular because
one doesn't get the same result as realpath for the first test. The
zshexpn(1) man page currently says:
a Turn a file name into an absolute path: prepends the
current directory, if necessary, and resolves any use of
`..' and `.' in the path. Note that the transformation
takes place even if the file or any intervening directo‐
ries do not exist.
A As `a', but also resolve use of symbolic links where
possible. Note that resolution of `..' occurs before
resolution of symbolic links. This call is equivalent
to a unless your system has the realpath system call
(modern systems do).
The fact that it refers to the realpath call (BTW this is not a
system call, but a GNU libc call under Linux) is strange because
neither ":a" not ":A" give the same result as realpath.
Moreover the error condition (no matches found) is inconsistent,
as /tmp/foo/foo/symlink-to-dot doesn't exist either.
-- System Information:
Debian Release: 6.0
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/8 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages zsh depends on:
ii libc6 2.11.2-7 Embedded GNU C Library: Shared lib
ii libcap2 1:2.19-3 support for getting/setting POSIX.
ii libncursesw5 5.7+20100313-4 shared libraries for terminal hand
Versions of packages zsh recommends:
ii libc6 2.11.2-7 Embedded GNU C Library: Shared lib
ii libpcre3 8.02-1.1 Perl 5 Compatible Regular Expressi
Versions of packages zsh suggests:
ii zsh-doc 4.3.10-17 zsh documentation - info/HTML form
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