Added automatic index generation to fast-import.

diff --git a/git-cvsimport.perl b/git-cvsimport.perl
index 9f5031a61a29e470422a78d2d9a7fc792c7c823b..e5a00a12857036d01e2e0dd18510df511378854f 100755 (executable)
--- a/git-cvsimport.perl
+++ b/git-cvsimport.perl
@@ -17,7 +17,7 @@
 use warnings;
 use Getopt::Std;
 use File::Spec;
-use File::Temp qw(tempfile);
+use File::Temp qw(tempfile tmpnam);
 use File::Path qw(mkpath);
 use File::Basename qw(basename dirname);
 use Time::Local;
@@ -465,10 +465,9 @@ ($$)
 $ENV{"GIT_DIR"} = $git_dir;
 my $orig_git_index;
 $orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
-my ($git_ih, $git_index) = tempfile('gitXXXXXX', SUFFIX => '.idx',
-                                   DIR => File::Spec->tmpdir());
-close ($git_ih);
-$ENV{GIT_INDEX_FILE} = $git_index;
+
+my %index; # holds filenames of one index per branch
+
 unless(-d $git_dir) {
        system("git-init-db");
        die "Cannot init the GIT db at $git_tree: $?\n" if $?;
@@ -495,10 +494,6 @@ ($$)
        $orig_branch = $last_branch;
        $tip_at_start = `git-rev-parse --verify HEAD`;
 
-       # populate index
-       system('git-read-tree', $last_branch);
-       die "read-tree failed: $?\n" if $?;
-
        # Get the last import timestamps
        opendir(D,"$git_dir/refs/heads");
        while(defined(my $head = readdir(D))) {
@@ -615,6 +610,27 @@ ()
 $ignorebranch{'#CVSPS_NO_BRANCH'} = 1;
 
 sub commit {
+       if ($branch eq $opt_o && !$index{branch} && !get_headref($branch, $git_dir)) {
+           # looks like an initial commit
+           # use the index primed by git-init-db
+           $ENV{GIT_INDEX_FILE} = '.git/index';
+           $index{$branch} = '.git/index';
+       } else {
+           # use an index per branch to speed up
+           # imports of projects with many branches
+           unless ($index{$branch}) {
+               $index{$branch} = tmpnam();
+               $ENV{GIT_INDEX_FILE} = $index{$branch};
+               if ($ancestor) {
+                   system("git-read-tree", $ancestor);
+               } else {
+                   system("git-read-tree", $branch);
+               }
+               die "read-tree failed: $?\n" if $?;
+           }
+       }
+        $ENV{GIT_INDEX_FILE} = $index{$branch};
+
        update_index(@old, @new);
        @old = @new = ();
        my $tree = write_tree();
@@ -803,11 +819,6 @@ sub commit {
                        close(H)
                                or die "Could not write branch $branch: $!";
                }
-               if(($ancestor || $branch) ne $last_branch) {
-                       print "Switching from $last_branch to $branch\n" if $opt_v;
-                       system("git-read-tree", $branch);
-                       die "read-tree failed: $?\n" if $?;
-               }
                $last_branch = $branch if $branch ne $last_branch;
                $state = 9;
        } elsif($state == 8) {
@@ -870,7 +881,11 @@ sub commit {
 }
 commit() if $branch and $state != 11;
 
-unlink($git_index);
+foreach my $git_index (values %index) {
+    if ($git_index ne '.git/index') {
+       unlink($git_index);
+    }
+}
 
 if (defined $orig_git_index) {
        $ENV{GIT_INDEX_FILE} = $orig_git_index;