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Subject[RFC PATCH] scripts/get_maintainer.pl: Add optional "git blame" checking
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On Sun, 2009-08-02 at 19:08 +0200, Julia Lawall wrote:
> Perhaps someone who recently signed a patch
> should only be included if they modified a line that is near a line
> modified by the current patch?

Julia Lawall sent me a private email suggesting that
get_maintainers.pl should have the capability to include
signatories of commits that are modified by a particular patch.

Vegard Nossum did something similar once.
http://lkml.org/lkml/2008/5/29/449

Such a capability is provided with the patch below.
It can be enabled with the "--git-blame" command line option.

The modified script looks the commits for all lines in the
patch, and includes the "-by:" signatories for those commits.
It uses the same git-min-percent, git-max-maintainers, and
git-min-signatures options. git-since is ignored.

It can be used independently from the --git default, so
./scripts/get_maintainers.pl --nogit --git-blame <patch>
or
./scripts/get_maintainers.pl --nogit --git-blame -f <file>
is acceptable.

If used with -f <file>, all lines/commits for the file are
checked.

It can be slow if used with -f <file>

Signed-off-by: Joe Perches <joe@perches.com>

scripts/get_maintainer.pl | 133 ++++++++++++++++++++++++++++++++++++---------
1 files changed, 106 insertions(+), 27 deletions(-)

diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
index 278a45b..34dc4b3 100755
--- a/scripts/get_maintainer.pl
+++ b/scripts/get_maintainer.pl
@@ -13,7 +13,7 @@
use strict;

my $P = $0;
-my $V = '0.17';
+my $V = '0.18beta2';

use Getopt::Long qw(:config no_auto_abbrev);

@@ -29,6 +29,7 @@ my $email_git_min_signatures = 1;
my $email_git_max_maintainers = 5;
my $email_git_min_percent = 5;
my $email_git_since = "1-year-ago";
+my $email_git_blame = 0;
my $output_multiline = 1;
my $output_separator = ", ";
my $scm = 0;
@@ -68,6 +69,7 @@ if (!GetOptions(
'git-max-maintainers=i' => \$email_git_max_maintainers,
'git-min-percent=i' => \$email_git_min_percent,
'git-since=s' => \$email_git_since,
+ 'git-blame!' => \$email_git_blame,
'm!' => \$email_maintainer,
'n!' => \$email_usename,
'l!' => \$email_list,
@@ -150,6 +152,7 @@ close(MAINT);
## use the filenames on the command line or find the filenames in the patchfiles

my @files = ();
+my @range = ();

foreach my $file (@ARGV) {
##if $file is a directory and it lacks a trailing slash, add one
@@ -162,13 +165,19 @@ foreach my $file (@ARGV) {
push(@files, $file);
} else {
my $file_cnt = @files;
+ my $lastfile;
open(PATCH, "<$file") or die "$P: Can't open ${file}\n";
while (<PATCH>) {
if (m/^\+\+\+\s+(\S+)/) {
my $filename = $1;
$filename =~ s@^[^/]*/@@;
$filename =~ s@\n@@;
+ $lastfile = $filename;
push(@files, $filename);
+ } elsif (m/^\@\@ -(\d+),(\d+)/) {
+ if ($email_git_blame) {
+ push(@range, "$lastfile:$1:$2");
+ }
}
}
close(PATCH);
@@ -226,6 +235,9 @@ foreach my $file (@files) {
recent_git_signoffs($file);
}

+ if ($email && $email_git_blame) {
+ git_assign_blame($file);
+ }
}

if ($email) {
@@ -311,6 +323,7 @@ MAINTAINER field selection options:
--git-max-maintainers => maximum maintainers to add (default: 5)
--git-min-percent => minimum percentage of commits required (default: 5)
--git-since => git history to use (default: 1-year-ago)
+ --git-blame => use git blame to find modified commits for patch or file
--m => include maintainer(s) if any
--n => include name 'Full Name <addr\@domain.tld>'
--l => include list(s) if any
@@ -333,13 +346,15 @@ Other options:

Notes:
Using "-f directory" may give unexpected results:
-
- Used with "--git", git signators for _all_ files in and below
- directory are examined as git recurses directories.
- Any specified X: (exclude) pattern matches are _not_ ignored.
- Used with "--nogit", directory is used as a pattern match,
- no individual file within the directory or subdirectory
- is matched.
+ Used with "--git", git signators for _all_ files in and below
+ directory are examined as git recurses directories.
+ Any specified X: (exclude) pattern matches are _not_ ignored.
+ Used with "--nogit", directory is used as a pattern match,
+ no individual file within the directory or subdirectory
+ is matched.
+ Used with "--git-blame", does not iterate all files in directory
+ Using "--git-blame" is slow and may add old committers and authors
+ that are no longer active maintainers to the output.
EOT
}

@@ -449,14 +464,19 @@ sub push_email_address {
my ($email_address) = @_;

my $email_name = "";
- if ($email_address =~ m/([^<]+)<(.*\@.*)>$/) {
- $email_name = $1;
- $email_address = $2;
- }

if ($email_maintainer) {
- if ($email_usename && $email_name) {
- push(@email_to, format_email($email_name, $email_address));
+ if ($email_address =~ m/([^<]+)<(.*\@.*)>$/) {
+ $email_name = $1;
+ $email_address = $2;
+ if ($email_usename) {
+ push(@email_to, format_email($email_name, $email_address));
+ } else {
+ push(@email_to, $email_address);
+ }
+ } elsif ($email_address =~ m/<(.+)>/) {
+ $email_address = $1;
+ push(@email_to, $email_address);
} else {
push(@email_to, $email_address);
}
@@ -545,20 +565,79 @@ sub recent_git_signoffs {
last;
}
}
- if ($line =~ m/(.+)<(.+)>/) {
- my $git_name = $1;
- my $git_addr = $2;
- if ($email_usename) {
- push(@email_to, format_email($git_name, $git_addr));
- } else {
- push(@email_to, $git_addr);
- }
- } elsif ($line =~ m/<(.+)>/) {
- my $git_addr = $1;
- push(@email_to, $git_addr);
- } else {
- push(@email_to, $line);
+ push_email_address($line);
+ }
+}
+
+sub save_commits {
+ my ($cmd, @commits) = @_;
+ my $output;
+ my @lines = ();
+
+ $output = `${cmd}`;
+
+ @lines = split("\n", $output);
+ foreach my $line (@lines) {
+ if ($line =~ m/^(\w+) /) {
+ push (@commits, $1);
+ }
+ }
+ return @commits;
+}
+
+sub git_assign_blame {
+ my ($file) = @_;
+
+ my @lines = ();
+ my @commits = ();
+ my $cmd;
+ my $output;
+ my %hash;
+ my $total_sign_offs;
+ my $count;
+
+ if (@range) {
+ foreach my $file_range_diff (@range) {
+ next if (!($file_range_diff =~ m/(.+):(.+):(.+)/));
+ my $diff_file = $1;
+ my $diff_start = $2;
+ my $diff_length = $3;
+ next if (!("$file" eq "$diff_file"));
+ $cmd = "git blame -l -L $diff_start,+$diff_length $file\n";
+ @commits = save_commits($cmd, @commits);
}
+ } else {
+ if (-f $file) {
+ $cmd = "git blame -l $file\n";
+ @commits = save_commits($cmd, @commits);
+ }
+ }
+
+ $total_sign_offs = 0;
+ @commits = uniq(@commits);
+ foreach my $commit (@commits) {
+ $cmd = "git log -1 ${commit}";
+ $cmd .= " | grep -Ei \"^[-_ a-z]+by:.*\\\@.*\$\"";
+ if (!$email_git_penguin_chiefs) {
+ $cmd .= " | grep -Ev \"${penguin_chiefs}\"";
+ }
+ $cmd .= " | cut -f2- -d\":\"";
+
+ $output = `${cmd}`;
+ $output =~ s/^\s*//gm;
+ @lines = split("\n", $output);
+ $hash{$_}++ for @lines;
+ $total_sign_offs += @lines;
+ }
+
+ $count = 0;
+ foreach my $line (sort {$hash{$b} <=> $hash{$a}} keys %hash) {
+ my $sign_offs = $hash{$line};
+ $count++;
+ last if ($sign_offs < $email_git_min_signatures ||
+ $count > $email_git_max_maintainers ||
+ $sign_offs * 100 / $total_sign_offs < $email_git_min_percent);
+ push_email_address($line);
}
}




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