[PATCH v2] git-svn: add --authors-prog option

[Mark Lodato <lodatom@gmail.com>]

Add a new option, --authors-prog, to git-svn that allows a more flexible
alternative (or supplement) to --authors-file.  This allows more
advanced username operations than the authors file will allow.  For
example, one may look up Subversion users via LDAP, or may generate the
name and email address from the Subversion username.

Notes:

* If both --authors-name and --authors-prog are given, the former is
  tried first, falling back to the later.

* The program is called once per unique SVN username and the result is
  cached.

* The command-line argument must be the path to a program, not a generic
  shell command line.  The absolute path to this program is taken at
  startup since the git-svn script changes directory during operation.

* The option is not enabled for `git log'.

Signed-off-by: Mark Lodato <lodatom@gmail.com>
---

This is my second attempt at a patch.  I received no feedback from the
first attempt, so I suppose I made a mistake.  I cleaned up my commit
message, added a Signed-off-by, CC'd the appropriate maintainers, and
put the additional message (this paragraph) in the correct location.
The contents of the patch have not changed.  Sorry for the resend; I'm
still learning.

 Documentation/git-svn.txt       |    8 ++++
 git-svn.perl                    |   30 +++++++++++++++--
 t/t9138-git-svn-authors-prog.sh |   69 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 104 insertions(+), 3 deletions(-)
 create mode 100755 t/t9138-git-svn-authors-prog.sh

diff --git a/Documentation/git-svn.txt b/Documentation/git-svn.txt
index 1c40894..78582ad 100644
--- a/Documentation/git-svn.txt
+++ b/Documentation/git-svn.txt
@@ -398,6 +398,14 @@ after the authors-file is modified should continue operation.
 
 config key: svn.authorsfile
 
+--authors-prog=<filename>::
+
+If this option is specified, for each SVN committer name that does not
+exist in the authors file, the given file is executed with the commiter
+name as the first argument.  The program is expected to return a single
+line of the form "Name <email>", which will be logically inserted into the
+authors file.
+
 -q::
 --quiet::
 	Make 'git-svn' less verbose. Specify a second time to make it
diff --git a/git-svn.perl b/git-svn.perl
index ef1d30d..f9c9567 100755
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -5,7 +5,7 @@ use warnings;
 use strict;
 use vars qw/	$AUTHOR $VERSION
 		$sha1 $sha1_short $_revision $_repository
-		$_q $_authors %users/;
+		$_q $_authors $_authors_prog %users/;
 $AUTHOR = 'Eric Wong <normalperson@yhbt.net>';
 $VERSION = '@@GIT_VERSION@@';
 
@@ -39,6 +39,7 @@ use Digest::MD5;
 use IO::File qw//;
 use File::Basename qw/dirname basename/;
 use File::Path qw/mkpath/;
+use File::Spec;
 use Getopt::Long qw/:config gnu_getopt no_ignore_case auto_abbrev/;
 use IPC::Open3;
 use Git;
@@ -76,6 +77,7 @@ my %remote_opts = ( 'username=s' => \$Git::SVN::Prompt::_username,
                     'ignore-paths=s' => \$SVN::Git::Fetcher::_ignore_regex );
 my %fc_opts = ( 'follow-parent|follow!' => \$Git::SVN::_follow_parent,
 		'authors-file|A=s' => \$_authors,
+		'authors-prog=s' => \$_authors_prog,
 		'repack:i' => \$Git::SVN::_repack,
 		'noMetadata' => \$Git::SVN::_no_metadata,
 		'useSvmProps' => \$Git::SVN::_use_svm_props,
@@ -263,6 +265,7 @@ usage(0) if $_help;
 version() if $_version;
 usage(1) unless defined $cmd;
 load_authors() if $_authors;
+$_authors_prog = "'" . File::Spec->rel2abs($_authors_prog) . "'";
 
 unless ($cmd =~ /^(?:clone|init|multi-init|commit-diff)$/) {
 	Git::SVN::Migration::migration_check();
@@ -2663,12 +2666,33 @@ sub other_gs {
 	$gs
 }
 
+sub call_authors_prog {
+	my ($orig_author) = @_;
+	my $author = `$::_authors_prog $orig_author`;
+	if ($? != 0) {
+		die "$::_authors_prog failed with exit code $?\n"
+	}
+	if ($author =~ /^\s*(.+?)\s*<(.*)>\s*$/) {
+		my ($name, $email) = ($1, $2);
+		$email = undef if length $2 == 0;
+		return [$name, $email];
+	} else {
+		die "Author: $orig_author: $::_authors_prog returned "
+			. "invalid author format: $author\n";
+	}
+}
+
 sub check_author {
 	my ($author) = @_;
 	if (!defined $author || length $author == 0) {
 		$author = '(no author)';
-	} elsif (defined $::_authors && ! defined $::users{$author}) {
-		die "Author: $author not defined in $::_authors file\n";
+	}
+	if (!defined $::users{$author}) {
+		if (defined $::_authors_prog) {
+			$::users{$author} = call_authors_prog($author);
+		} elsif (defined $::_authors) {
+			die "Author: $author not defined in $::_authors file\n";
+		}
 	}
 	$author;
 }
diff --git a/t/t9138-git-svn-authors-prog.sh b/t/t9138-git-svn-authors-prog.sh
new file mode 100755
index 0000000..a4b00f2
--- /dev/null
+++ b/t/t9138-git-svn-authors-prog.sh
@@ -0,0 +1,69 @@
+#!/bin/sh
+#
+# Copyright (c) 2009 Eric Wong, Mark Lodato
+#
+
+test_description='git svn authors prog tests'
+
+. ./lib-git-svn.sh
+
+cat > svn-authors-prog <<'EOF'
+#!/usr/bin/perl
+$_ = shift;
+if (s/-sub$//)  {
+	print "$_ <$_\@sub.example.com>\n";
+}
+else {
+	print "$_ <$_\@example.com>\n";
+}
+EOF
+chmod +x svn-authors-prog
+
+cat > svn-authors <<'EOF'
+ff = FFFFFFF FFFFFFF <fFf@other.example.com>
+EOF
+
+test_expect_success 'setup svnrepo' '
+	for i in aa bb cc-sub dd-sub ee-foo ff
+	do
+		svn mkdir -m $i --username $i "$svnrepo"/$i
+	done
+	'
+
+test_expect_success 'import authors with prog and file' '
+	git svn clone --authors-prog=./svn-authors-prog \
+	    --authors-file=svn-authors "$svnrepo" x
+	'
+
+test_expect_success 'imported 6 revisions successfully' '
+	(
+		cd x
+		test "`git rev-list refs/remotes/git-svn | wc -l`" -eq 6
+	)
+	'
+
+test_expect_success 'authors-prog ran correctly' '
+	(
+		cd x
+		git rev-list -1 --pretty=raw refs/remotes/git-svn~1 | \
+		  grep "^author ee-foo <ee-foo@example\.com> " &&
+		git rev-list -1 --pretty=raw refs/remotes/git-svn~2 | \
+		  grep "^author dd <dd@sub\.example\.com> " &&
+		git rev-list -1 --pretty=raw refs/remotes/git-svn~3 | \
+		  grep "^author cc <cc@sub\.example\.com> " &&
+		git rev-list -1 --pretty=raw refs/remotes/git-svn~4 | \
+		  grep "^author bb <bb@example\.com> " &&
+		git rev-list -1 --pretty=raw refs/remotes/git-svn~5 | \
+		  grep "^author aa <aa@example\.com> "
+	)
+	'
+
+test_expect_success 'authors-file overrode authors-prog' '
+	(
+		cd x
+		git rev-list -1 --pretty=raw refs/remotes/git-svn | \
+		  grep "^author FFFFFFF FFFFFFF <fFf@other\.example\.com> "
+	)
+	'
+
+test_done
-- 
1.6.3