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authorEric Wong <normalperson@yhbt.net>2007-12-08 23:27:41 -0800
committerJunio C Hamano <gitster@pobox.com>2007-12-10 21:28:25 -0800
commit060610c572b21d00bb09ebbab664c0452c7eac9d (patch)
treef1f9eb782df1482fc39b2f81f4f6205d0d221bdd /t/lib-git-svn.sh
parent591aa2536fdbc4090ba8d4ca512d4ee7df4bf05d (diff)
downloadgit-060610c572b21d00bb09ebbab664c0452c7eac9d.tar.gz
git-svn: replace .rev_db with a more space-efficient .rev_map format
Migrations are done automatically on an as-needed basis when new revisions are to be fetched. Stale remote branches do not get migrated, yet. However, unless you set noMetadata or useSvkProps it's safe to just do: find $GIT_DIR/svn -name '.rev_db*' -print0 | xargs rm -f to purge all the old .rev_db files. The new format is a one-way migration and is NOT compatible with old versions of git-svn. This is the replacement for the rev_db format, which was too big and inefficient for large repositories with a lot of sparse history (mainly tags). The format is this: - 24 bytes for every record, * 4 bytes for the integer representing an SVN revision number * 20 bytes representing the sha1 of a git commit - No empty padding records like the old format - new records are written append-only since SVN revision numbers increase monotonically - lookups on SVN revision number are done via a binary search - Piping the file to xxd(1) -c24 is a good way of dumping it for viewing or editing, should the need ever arise. As with .rev_db, these files are disposable unless noMetadata or useSvmProps is set. Signed-off-by: Eric Wong <normalperson@yhbt.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't/lib-git-svn.sh')
-rw-r--r--t/lib-git-svn.sh26
1 files changed, 26 insertions, 0 deletions
diff --git a/t/lib-git-svn.sh b/t/lib-git-svn.sh
index 8d4a447213..9ee35e7901 100644
--- a/t/lib-git-svn.sh
+++ b/t/lib-git-svn.sh
@@ -82,3 +82,29 @@ stop_httpd () {
test -z "$SVN_HTTPD_PORT" && return
"$SVN_HTTPD_PATH" -f "$GIT_DIR"/httpd.conf -k stop
}
+
+convert_to_rev_db () {
+ perl -w -- - "$@" <<\EOF
+use strict;
+@ARGV == 2 or die "Usage: convert_to_rev_db <input> <output>";
+open my $wr, '+>', $ARGV[1] or die "$!: couldn't open: $ARGV[1]";
+open my $rd, '<', $ARGV[0] or die "$!: couldn't open: $ARGV[0]";
+my $size = (stat($rd))[7];
+($size % 24) == 0 or die "Inconsistent size: $size";
+while (sysread($rd, my $buf, 24) == 24) {
+ my ($r, $c) = unpack('NH40', $buf);
+ my $offset = $r * 41;
+ seek $wr, 0, 2 or die $!;
+ my $pos = tell $wr;
+ if ($pos < $offset) {
+ for (1 .. (($offset - $pos) / 41)) {
+ print $wr (('0' x 40),"\n") or die $!;
+ }
+ }
+ seek $wr, $offset, 0 or die $!;
+ print $wr $c,"\n" or die $!;
+}
+close $wr or die $!;
+close $rd or die $!;
+EOF
+}