Since git-rev-parse already checks for the $GIT_DIR environment
variable and that it returns an actual git repository, there is no
need to repeat the checks again here.

This also fixes a problem where git-svn did not work in cases where
.git was a file with a gitdir: link.

Signed-off-by: Barry Wardell <barry.ward...@gmail.com>
---
 git-svn.perl | 36 +++++++++++++-----------------------
 1 file changed, 13 insertions(+), 23 deletions(-)

diff --git a/git-svn.perl b/git-svn.perl
index bd5266c..3bcd769 100755
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -61,8 +61,6 @@ my $cmd_dir_prefix = eval {
        command_oneline([qw/rev-parse --show-prefix/], STDERR => 0)
 } || '';
 
-my $git_dir_user_set = 1 if defined $ENV{GIT_DIR};
-$ENV{GIT_DIR} ||= '.git';
 $Git::SVN::Ra::_log_window_size = 100;
 
 if (! exists $ENV{SVN_SSH} && exists $ENV{GIT_SSH}) {
@@ -325,27 +323,19 @@ for (my $i = 0; $i < @ARGV; $i++) {
 };
 
 # make sure we're always running at the top-level working directory
-unless ($cmd && $cmd =~ /(?:clone|init|multi-init)$/) {
-       unless (-d $ENV{GIT_DIR}) {
-               if ($git_dir_user_set) {
-                       die "GIT_DIR=$ENV{GIT_DIR} explicitly set, ",
-                           "but it is not a directory\n";
-               }
-               my $git_dir = delete $ENV{GIT_DIR};
-               my $cdup = undef;
-               git_cmd_try {
-                       $cdup = command_oneline(qw/rev-parse --show-cdup/);
-                       $git_dir = '.' unless ($cdup);
-                       chomp $cdup if ($cdup);
-                       $cdup = "." unless ($cdup && length $cdup);
-               } "Already at toplevel, but $git_dir not found\n";
-               chdir $cdup or die "Unable to chdir up to '$cdup'\n";
-               unless (-d $git_dir) {
-                       die "$git_dir still not found after going to ",
-                           "'$cdup'\n";
-               }
-               $ENV{GIT_DIR} = $git_dir;
-       }
+if ($cmd && $cmd =~ /(?:clone|init|multi-init)$/) {
+       $ENV{GIT_DIR} ||= ".git";
+} else {
+       git_cmd_try {
+               $ENV{GIT_DIR} = command_oneline([qw/rev-parse --git-dir/]);
+       } "Unable to find .git directory\n";
+       my $cdup = undef;
+       git_cmd_try {
+               $cdup = command_oneline(qw/rev-parse --show-cdup/);
+               chomp $cdup if ($cdup);
+               $cdup = "." unless ($cdup && length $cdup);
+       } "Already at toplevel, but $ENV{GIT_DIR} not found\n";
+       chdir $cdup or die "Unable to chdir up to '$cdup'\n";
        $_repository = Git->repository(Repository => $ENV{GIT_DIR});
 }
 
-- 
1.8.0

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