CODEWITHSUNDEEP
bashcygwin
Val
Val

Reputation: 11107

readlink in cygwin

I do the most basic thing in every script 

  SCRIPT=`readlink -f ${0}`
  HOME=`dirname $SCRIPT`

and, given $0 = C:\Users\dir\file, readlink gives me /cygdrive/c/CURRENT_DIRECTORY/C:\Users\dir\file so that the next dirname produces terrible /cygdrive/c/Users/CURRENT_DIRECTORY/C:\Users\dir instead of C:\Users\dir or /cygdrive/c/Users/dir

Is it supposed to work this way?

Upvotes: 2

Views: 1625

Answers (2)

Phil Goetz
Phil Goetz

Reputation: 605

readlink in cygwin (Windows 7) is driving me crazy. The same code works, then doesn't work, from moment to moment, with no changes to the input data. Mostly it doesn't work now (May 2013). It worked in January 2013.

$ ln -s foo bar
$ perl -e 'print readlink("/cygdrive/C/bin/bar")'
foo

but try that in a running program and it doesn't always work. readlink(`cygpath $file`) worked the first time I ran it, but on immediately re-running the program, it could no longer read the same $file and returned undef.

I'm currently using this horrible kludge. It works, but I hate it:

if (-l $file) {
    my $real = readlink($file);
    if (!$real) {
         # KLUDGE FOR CYGWIN
         my $cmd = "perl -e 'print readlink(\"$file\")'";
         $real = `$cmd`;
         die "ERR: No link for link $file date=$fileDate" unless $real;

Upvotes: 2

Val
Val

Reputation: 11107

It seems that I have found the answer: we should convert $0 into cygwin format then readlink can work with it

ZERO=`cygpath ${0}`
SCRIPT=`readlink -f ${ZERO}`

Upvotes: 5

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