# [PATCH] git-svn: follow revisions of svm-mirrored repositories

4 messages from 2008-06-14 to 2008-06-18. Participants: João Abecasis, Sam Vilain.
Thread: https://gitlist.dev/t/13941

## João Abecasis, 2008-06-14 04:02

Subject: [PATCH] git-svn: follow revisions of svm-mirrored repositories
Message-ID: <7bf6f1d20806132102x71422617s26260fdc348a7c04@mail.gmail.com>
URL: https://gitlist.dev/e/7bf6f1d20806132102x71422617s26260fdc348a7c04%40mail.gmail.com

```
Hi,

When using an svk mirror repository as the source for git-svn,
find-rev and rebase don't work.

find-rev takes a while, while it traverses and processes commit logs
for the branch, and ultimately fails with the error message: "Unable
to determine upstream SVN information from git-svn history". This
happens because find-rev doesn't relate information in the commit
messages to the internal svm-source revision maps.

Similarly, rebase is faster but still exits with the message "Unable
to determine upstream SVN information from working tree history".

The attached patch fixes a couple of underlying issues to get at least
these two commands working. AFAICT it still works well with plain svn
repositories.

Can this be merged upstream? Any comments are welcome.

Cheers,


-- João


From 9e348a4a25d0ea1fe48dcf5175a2853267933860 Mon Sep 17 00:00:00 2001
From: =?utf-8?q?Jo=C3=A3o=20Abecasis?= <joao@abecasis.name>
Date: Fri, 13 Jun 2008 20:32:57 -0500
Subject: [PATCH] git-svn: follow revisions of svm-mirrored repositories

Although git-svn keeps track of source revisions in svm-mirrored
repositories, it doesn't use that information in all places.

This fixes working_head_info and Git::SVN::find_by_url to work with
mirrored repositories when useSvmProps is set. At least the commands
find-rev and rebase, which didn't work for me with svm-mirrored
repositories, are now working.
---
 git-svn.perl |   25 +++++++++++++++++++++----
 1 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/git-svn.perl b/git-svn.perl
index 47b0c37..db054d2 100755
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -537,13 +537,13 @@ sub cmd_find_rev {
 		my $head = shift;
 		$head ||= 'HEAD';
 		my @refs;
-		my (undef, undef, undef, $gs) = working_head_info($head, \@refs);
+		my (undef, undef, $uuid, $gs) = working_head_info($head, \@refs);
 		unless ($gs) {
 			die "Unable to determine upstream SVN information from ",
 			    "$head history\n";
 		}
 		my $desired_revision = substr($revision_or_hash, 1);
-		$result = $gs->rev_map_get($desired_revision);
+		$result = $gs->rev_map_get($desired_revision, $uuid);
 	} else {
 		my (undef, $rev, undef) = cmt_metadata($revision_or_hash);
 		$result = $rev;
@@ -1158,7 +1158,7 @@ sub working_head_info {
 		if (defined $url && defined $rev) {
 			next if $max{$url} and $max{$url} < $rev;
 			if (my $gs = Git::SVN->find_by_url($url)) {
-				my $c = $gs->rev_map_get($rev);
+				my $c = $gs->rev_map_get($rev, $uuid);
 				if ($c && $c eq $hash) {
 					close $fh; # break the pipe
 					return ($url, $rev, $uuid, $gs);
@@ -1417,6 +1417,16 @@ sub read_all_remotes {
 			my ($remote, $local_ref, $remote_ref) = ($1, $2, $3);
 			$local_ref =~ s{^/}{};
 			$r->{$remote}->{fetch}->{$local_ref} = $remote_ref;
+		} elsif (m!^(.+)\.usesvmprops=\s*(.*)\s*$!) {
+			my $svm;
+			eval {
+				my $section = "svn-remote.$1";
+				$svm = {
+					source => tmp_config('--get', "$section.svm-source"),
+					replace => tmp_config('--get', "$section.svm-replace"),
+				}
+			};
+			$r->{$1}->{svm} = $svm;
 		} elsif (m!^(.+)\.url=\s*(.*)\s*$!) {
 			$r->{$1}->{url} = $2;
 		} elsif (m!^(.+)\.(branches|tags)=
@@ -1566,13 +1576,20 @@ sub find_by_url { # repos_root and, path are optional
 		}
 		my $p = $path;
 		my $rwr = rewrite_root({repo_id => $repo_id});
+		my $svm = $remotes->{$repo_id}->{svm}
+			if defined $remotes->{$repo_id}->{svm};
 		unless (defined $p) {
 			$p = $full_url;
 			my $z = $u;
+			my $prefix = '';
 			if ($rwr) {
 				$z = $rwr;
+			} elsif (defined $svm) {
+				$z = $svm->{source};
+				$prefix = $svm->{replace};
+				$prefix =~ s#^\Q$u\E(?=/|$)##;
 			}
-			$p =~ s#^\Q$z\E(?:/|$)## or next;
+			$p =~ s#^\Q$z\E(?:/|$)#$prefix# or next;
 		}
 		foreach my $f (keys %$fetch) {
 			next if $f ne $p;
-- 
1.5.5.1


```

## Sam Vilain, 2008-06-15 21:30

Subject: Re: [PATCH] git-svn: follow revisions of svm-mirrored repositories
Message-ID: <485589F5.6020409@vilain.net>
URL: https://gitlist.dev/e/485589F5.6020409%40vilain.net
In-Reply-To: <7bf6f1d20806132102x71422617s26260fdc348a7c04@mail.gmail.com>

```
João Abecasis wrote:
> Hi,
> 
> When using an svk mirror repository as the source for git-svn,
> find-rev and rebase don't work.
> 
> find-rev takes a while, while it traverses and processes commit logs
> for the branch, and ultimately fails with the error message: "Unable
> to determine upstream SVN information from git-svn history". This
> happens because find-rev doesn't relate information in the commit
> messages to the internal svm-source revision maps.
> 
> Similarly, rebase is faster but still exits with the message "Unable
> to determine upstream SVN information from working tree history".
> 
> The attached patch fixes a couple of underlying issues to get at least
> these two commands working. AFAICT it still works well with plain svn
> repositories.
> 
> Can this be merged upstream? Any comments are welcome.

Can you give an approximate series of commands that led to this not
working?  Just to clarify what happened.  Ideally, it would be a test
case; see if you can add it to the existing SVM test case.  In fact this
might be a regression compared to the original support, due to lack of
tests - in which case it would be good to fix this "for good".

Also, please try to send your patches inline if possible, or at least
try to get them to be Content-Disposition: inline, it makes review
easier for casual list subscribers.

Thanks,
Sam.

```

## João Abecasis, 2008-06-18 02:57

Subject: Re: [PATCH] git-svn: follow revisions of svm-mirrored repositories
Message-ID: <7bf6f1d20806171957k29dbdd4fh52c3b515e7b573d@mail.gmail.com>
URL: https://gitlist.dev/e/7bf6f1d20806171957k29dbdd4fh52c3b515e7b573d%40mail.gmail.com
In-Reply-To: <485589F5.6020409@vilain.net>

```
Hi Sam,

Thanks for your reply. I'm currently on the road so may be a little
slow to respond. Please bear with me.

Sam Vilain wrote:
>> When using an svk mirror repository as the source for git-svn,
>> find-rev and rebase don't work.
>>
>> find-rev takes a while, while it traverses and processes commit logs
>> for the branch, and ultimately fails with the error message: "Unable
>> to determine upstream SVN information from git-svn history". This
>> happens because find-rev doesn't relate information in the commit
>> messages to the internal svm-source revision maps.
>>
>> Similarly, rebase is faster but still exits with the message "Unable
>> to determine upstream SVN information from working tree history".
>>
>> The attached patch fixes a couple of underlying issues to get at least
>> these two commands working. AFAICT it still works well with plain svn
>> repositories.
>>
>> Can this be merged upstream? Any comments are welcome.
>
> Can you give an approximate series of commands that led to this not
> working?  Just to clarify what happened.  Ideally, it would be a test
> case; see if you can add it to the existing SVM test case.  In fact this
> might be a regression compared to the original support, due to lack of
> tests - in which case it would be good to fix this "for good".

I haven't tried the test cases yet, but will look into it. Perhaps
that can also hammer out other places where svm-mirror support is
incomplete.

In the meantime, reproducing the 2 issues my patch is supposed to fix
is rather straightforward, but there could be something that I missed,
so here goes:

    # Preparation, skipped informational messages.
    $ git init
    $ git svn init --use-svm-props -s file:///path/to/svk/repository/and/mirror/
    # Populate repository
    $ git svn fetch

    # And the missing functionality.
    $ git svn rebase
    Unable to determine upstream SVN information from working tree history

    $ git svn find-rev r5
    Unable to determine upstream SVN information from HEAD history

And trying out the test case I just noticed an issue with my previous
patch, with misplaced // -- somehow it didn't show up in my previous
tests. I'll post an updated patch, shortly.

> Also, please try to send your patches inline if possible, or at least
> try to get them to be Content-Disposition: inline, it makes review
> easier for casual list subscribers.

I was worried that sending patches inlined would break the patch
because of line lengths and such, since I'm using Gmail's web
interface. Anyway, I'll try that we'll see how that goes.

Cheers,


João

```

## João Abecasis, 2008-06-18 02:58

Subject: Re: [PATCH] git-svn: follow revisions of svm-mirrored repositories
Message-ID: <7bf6f1d20806171958y4104a77cxf660d2853d391e2d@mail.gmail.com>
URL: https://gitlist.dev/e/7bf6f1d20806171958y4104a77cxf660d2853d391e2d%40mail.gmail.com
In-Reply-To: <7bf6f1d20806171957k29dbdd4fh52c3b515e7b573d@mail.gmail.com>

```
Although git-svn keeps track of source revisions in svm-mirrored
repositories, it doesn't use that information in all places.

This fixes working_head_info and Git::SVN::find_by_url to work with
mirrored repositories when useSvmProps is set. At least the commands
find-rev and rebase, which didn't work for me with svm-mirrored
repositories, are now working.
---
 git-svn.perl |   26 ++++++++++++++++++++++----
 1 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/git-svn.perl b/git-svn.perl
index 47b0c37..51325b6 100755
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -537,13 +537,13 @@ sub cmd_find_rev {
 		my $head = shift;
 		$head ||= 'HEAD';
 		my @refs;
-		my (undef, undef, undef, $gs) = working_head_info($head, \@refs);
+		my (undef, undef, $uuid, $gs) = working_head_info($head, \@refs);
 		unless ($gs) {
 			die "Unable to determine upstream SVN information from ",
 			    "$head history\n";
 		}
 		my $desired_revision = substr($revision_or_hash, 1);
-		$result = $gs->rev_map_get($desired_revision);
+		$result = $gs->rev_map_get($desired_revision, $uuid);
 	} else {
 		my (undef, $rev, undef) = cmt_metadata($revision_or_hash);
 		$result = $rev;
@@ -1158,7 +1158,7 @@ sub working_head_info {
 		if (defined $url && defined $rev) {
 			next if $max{$url} and $max{$url} < $rev;
 			if (my $gs = Git::SVN->find_by_url($url)) {
-				my $c = $gs->rev_map_get($rev);
+				my $c = $gs->rev_map_get($rev, $uuid);
 				if ($c && $c eq $hash) {
 					close $fh; # break the pipe
 					return ($url, $rev, $uuid, $gs);
@@ -1417,6 +1417,16 @@ sub read_all_remotes {
 			my ($remote, $local_ref, $remote_ref) = ($1, $2, $3);
 			$local_ref =~ s{^/}{};
 			$r->{$remote}->{fetch}->{$local_ref} = $remote_ref;
+		} elsif (m!^(.+)\.usesvmprops=\s*(.*)\s*$!) {
+			my $svm;
+			eval {
+				my $section = "svn-remote.$1";
+				$svm = {
+					source => tmp_config('--get', "$section.svm-source"),
+					replace => tmp_config('--get', "$section.svm-replace"),
+				}
+			};
+			$r->{$1}->{svm} = $svm;
 		} elsif (m!^(.+)\.url=\s*(.*)\s*$!) {
 			$r->{$1}->{url} = $2;
 		} elsif (m!^(.+)\.(branches|tags)=
@@ -1566,13 +1576,21 @@ sub find_by_url { # repos_root and, path are optional
 		}
 		my $p = $path;
 		my $rwr = rewrite_root({repo_id => $repo_id});
+		my $svm = $remotes->{$repo_id}->{svm}
+			if defined $remotes->{$repo_id}->{svm};
 		unless (defined $p) {
 			$p = $full_url;
 			my $z = $u;
+			my $prefix = '';
 			if ($rwr) {
 				$z = $rwr;
+			} elsif (defined $svm) {
+				$z = $svm->{source};
+				$prefix = $svm->{replace};
+				$prefix =~ s#^\Q$u\E(?:/|$)##;
+				$prefix =~ s#(.+?)/?$#$1/#;
 			}
-			$p =~ s#^\Q$z\E(?:/|$)## or next;
+			$p =~ s#^\Q$z\E(?:/|$)#$prefix# or next;
 		}
 		foreach my $f (keys %$fetch) {
 			next if $f ne $p;
-- 
1.5.5.1

```