Fix crash when reading the empty tree

diff --git a/git-annotate.perl b/git-annotate.perl
index d93ee19c7e7ff42762071c9df6f31da5dfa0fe80..9df72a1662c47790a7d97309e40dc1051e5f7fcc 100755 (executable)
--- a/git-annotate.perl
+++ b/git-annotate.perl
@@ -20,7 +20,7 @@ ()
        -r, --rename
                        Follow renames (Defaults on).
        -S, --rev-file revs-file
-                       use revs from revs-file instead of calling git-rev-list
+                       Use revs from revs-file instead of calling git-rev-list
        -h, --help
                        This message.
 ';
@@ -99,7 +99,7 @@ ()
        }
 }
 push @revqueue, $head;
-init_claim( defined $starting_rev ? $starting_rev : 'dirty');
+init_claim( defined $starting_rev ? $head : 'dirty');
 unless (defined $starting_rev) {
        my $diff = open_pipe("git","diff","-R", "HEAD", "--",$filename)
                or die "Failed to call git diff to check for dirty state: $!";
@@ -345,6 +345,7 @@ sub git_cat_file {
        return () unless defined $rev && defined $filename;
 
        my $blob = git_ls_tree($rev, $filename);
+       die "Failed to find a blob for $filename in rev $rev\n" if !defined $blob;
 
        my $catfile = open_pipe("git","cat-file", "blob", $blob)
                or die "Failed to git-cat-file blob $blob (rev $rev, file $filename): " . $!;
@@ -367,12 +368,13 @@ sub git_ls_tree {
 
        my ($mode, $type, $blob, $tfilename);
        while(<$lstree>) {
+               chomp;
                ($mode, $type, $blob, $tfilename) = split(/\s+/, $_, 4);
                last if ($tfilename eq $filename);
        }
        close($lstree);
 
-       return $blob if $filename eq $filename;
+       return $blob if ($tfilename eq $filename);
        die "git-ls-tree failed to find blob for $filename";
 
 }
@@ -418,7 +420,13 @@ sub format_date {
                return $_[0];
        }
        my ($timestamp, $timezone) = split(' ', $_[0]);
-       return strftime("%Y-%m-%d %H:%M:%S " . $timezone, gmtime($timestamp));
+       my $minutes = abs($timezone);
+       $minutes = int($minutes / 100) * 60 + ($minutes % 100);
+       if ($timezone < 0) {
+           $minutes = -$minutes;
+       }
+       my $t = $timestamp + $minutes * 60;
+       return strftime("%Y-%m-%d %H:%M:%S " . $timezone, gmtime($t));
 }
 
 # Copied from git-send-email.perl - We need a Git.pm module..