git-mv: fixes for path handling

Moving a directory ending in a slash was not working as the
destination was not calculated correctly.
E.g. in the git repo,

 git-mv t/ Documentation

gave the error

 Error: destination 'Documentation' already exists

To get rid of this problem, strip trailing slashes from all arguments.
The comment in cg-mv made me curious about this issue; Pasky, thanks!
As result, the workaround in cg-mv is not needed any more.

Also, another bug was shown by cg-mv. When moving files outside of
a subdirectory, it typically calls git-mv with something like

 git-mv Documentation/git.txt Documentation/../git-mv.txt

which triggers the following error from git-update-index:

 Ignoring path Documentation/../git-mv.txt

The result is a moved file, removed from git revisioning, but not
added again. To fix this, the paths have to be normalized not have ".."
in the middle. This was already done in git-mv, but only for
a better visual appearance :(

Signed-off-by: Josef Weidendorfer <Josef.Weidendorfer@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-mv.perl b/git-mv.perl
index 8cd95c472ffb7b86fcd1faa0c7b8d365029b9597..f3e859ae48af05d0b982a159c2197bab7e5da996 100755 (executable)
--- a/git-mv.perl
+++ b/git-mv.perl
@@ -31,13 +31,14 @@ chomp($GIT_DIR);
 my (@srcArgs, @dstArgs, @srcs, @dsts);
 my ($src, $dst, $base, $dstDir);
 
+# remove any trailing slash in arguments
+for (@ARGV) { s/\/*$//; }
+
 my $argCount = scalar @ARGV;
 if (-d $ARGV[$argCount-1]) {
        $dstDir = $ARGV[$argCount-1];
-       # remove any trailing slash
-       $dstDir =~ s/\/$//;
        @srcArgs = @ARGV[0..$argCount-2];
-       
+
        foreach $src (@srcArgs) {
                $base = $src;
                $base =~ s/^.*\///;
@@ -61,6 +62,16 @@ else {
     $dstDir = "";
 }
 
+# normalize paths, needed to compare against versioned files and update-index
+# also, this is nicer to end-users by doing ".//a/./b/.//./c" ==> "a/b/c"
+for (@srcArgs, @dstArgs) {
+    s|^\./||;
+    s|/\./|/| while (m|/\./|);
+    s|//+|/|g;
+    # Also "a/b/../c" ==> "a/c"
+    1 while (s,(^|/)[^/]+/\.\./,$1,);
+}
+
 my (@allfiles,@srcfiles,@dstfiles);
 my $safesrc;
 my (%overwritten, %srcForDst);
@@ -79,15 +90,6 @@ while(scalar @srcArgs > 0) {
     $dst = shift @dstArgs;
     $bad = "";
 
-    for ($src, $dst) {
-       # Be nicer to end-users by doing ".//a/./b/.//./c" ==> "a/b/c"
-       s|^\./||;
-       s|/\./|/| while (m|/\./|);
-       s|//+|/|g;
-       # Also "a/b/../c" ==> "a/c"
-       1 while (s,(^|/)[^/]+/\.\./,$1,);
-    }
-
     if ($opt_v) {
        print "Checking rename of '$src' to '$dst'\n";
     }