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#!/usr/bin/perl
# These two should go upon release to make the script Perl 5.005 compatible
use strict;
use warnings;
=head1 NAME
make_patchnum.pl - make patchnum
=head1 SYNOPSIS
miniperl make_patchnum.pl
perl make_patchnum.pl
=head1 DESCRIPTION
This program creates the files holding the information
about locally applied patches to the source code. The created
files are F<git_version.h> and F<lib/Config_git.pl>.
=head2 C<lib/Config_git.pl>
Contains status information from git in a form meant to be processed
by the tied hash logic of Config.pm. It is actually optional,
although -V:git.\* will be uninformative without it.
C<git_version.h> contains similar information in a C header file
format, designed to be used by patchlevel.h. This file is obtained
from stock_git_version.h if miniperl is not available, and then
later on replaced by the version created by this script.
=head1 AUTHOR
Yves Orton, Kenichi Ishigaki, Max Maischein
=head1 COPYRIGHT
Same terms as Perl itself.
=cut
# from a -Dmksymlink target dir, I need to cd to the git-src tree to
# use git (like script does). Presuming that's not unique, one fix is
# to follow Configure's symlink-path to run git. Maybe GIT_DIR or
# path-args can solve it, if so we should advise here, I tried only
# very briefly ('cd -' works too).
my ($subcd, $srcdir);
our $opt_v = scalar grep $_ eq '-v', @ARGV;
BEGIN {
my $root=".";
# test 1st to see if we're a -Dmksymlinks target dir
$subcd = '';
$srcdir = $root;
if (-l "./Configure") {
$srcdir = readlink("./Configure");
$srcdir =~ s/Configure//;
$subcd = "cd $srcdir &&"; # activate backtick fragment
}
while (!-e "$root/perl.c" and length($root)<100) {
if ($root eq '.') {
$root="..";
} else {
$root.="/..";
}
}
die "Can't find toplevel" if !-e "$root/perl.c";
sub path_to { "$root/$_[0]" } # use $_[0] if this'd be placed in toplevel.
}
sub read_file {
my $file = path_to(@_);
return "" unless -e $file;
open my $fh, '<', $file
or die "Failed to open for read '$file':$!";
return do { local $/; <$fh> };
}
sub write_file {
my ($file, $content) = @_;
$file= path_to($file);
open my $fh, '>', $file
or die "Failed to open for write '$file':$!";
print $fh $content;
close $fh;
}
sub backtick {
# only for git. If we're in a -Dmksymlinks build-dir, we need to
# cd to src so git will work . Probably a better way.
my $command = shift;
if (wantarray) {
my @result= `$subcd $command`;
#warn "$subcd $command: \$?=$?\n" if $?;
print "#> $subcd $command ->\n @result\n" if !$? and $opt_v;
chomp @result;
return @result;
} else {
my $result= `$subcd $command`;
$result="" if ! defined $result;
warn "$subcd $command: \$?=$?\n" if $?;
print "#> $subcd $command ->\n $result\n" if !$? and $opt_v;
chomp $result;
return $result;
}
}
sub write_files {
my %content= map { /WARNING: '([^']+)'/ || die "Bad mojo!"; $1 => $_ } @_;
my @files= sort keys %content;
my $files= join " and ", map { "'$_'" } @files;
foreach my $file (@files) {
if (read_file($file) ne $content{$file}) {
print "Updating $files\n";
write_file($_,$content{$_}) for @files;
return 1;
}
}
print "Reusing $files\n";
return 0;
}
my $unpushed_commits = ' ';
my ($read, $branch, $snapshot_created, $commit_id, $describe)= ("") x 5;
my ($changed, $extra_info, $commit_title)= ("") x 3;
if (my $patch_file= read_file(".patch")) {
($branch, $snapshot_created, $commit_id, $describe) = split /\s+/, $patch_file;
$extra_info = "git_snapshot_date='$snapshot_created'";
$commit_title = "Snapshot of:";
}
elsif (-d "$srcdir/.git") {
# git branch | awk 'BEGIN{ORS=""} /\*/ { print $2 }'
($branch) = map { /\* ([^(]\S*)/ ? $1 : "" } backtick("git branch");
my ($remote,$merge);
if (length $branch) {
$merge= backtick("git config branch.$branch.merge");
$merge = "" unless $? == 0;
$merge =~ s!^refs/heads/!!;
$remote= backtick("git config branch.$branch.remote");
$remote = "" unless $? == 0;
}
$commit_id = backtick("git rev-parse HEAD");
$describe = backtick("git describe");
my $commit_created = backtick(qq{git log -1 --pretty="format:%ci"});
$extra_info = "git_commit_date='$commit_created'";
backtick("git diff --no-ext-diff --quiet --exit-code");
$changed = $?;
unless ($changed) {
backtick("git diff-index --cached --quiet HEAD --");
$changed = $?;
}
if (length $branch && length $remote) {
# git cherry $remote/$branch | awk 'BEGIN{ORS=","} /\+/ {print $2}' | sed -e 's/,$//'
my $unpushed_commit_list =
join ",", map { (split /\s/, $_)[1] }
grep {/\+/} backtick("git cherry $remote/$merge");
# git cherry $remote/$branch | awk 'BEGIN{ORS="\t\\\\\n"} /\+/ {print ",\"" $2 "\""}'
$unpushed_commits =
join "", map { ',"'.(split /\s/, $_)[1]."\"\t\\\n" }
grep {/\+/} backtick("git cherry $remote/$merge");
if (length $unpushed_commits) {
$commit_title = "Local Commit:";
my $ancestor = backtick("git rev-parse $remote/$merge");
$extra_info = "$extra_info
git_ancestor='$ancestor'
git_remote_branch='$remote/$merge'
git_unpushed='$unpushed_commit_list'";
}
}
if ($changed) {
$commit_title = "Derived from:";
}
$commit_title ||= "Commit id:";
}
# we extract the filename out of the warning header, so dont mess with that
write_files(<<"EOF_HEADER", <<"EOF_CONFIG");
/**************************************************************************
* WARNING: 'git_version.h' is automatically generated by make_patchnum.pl
* DO NOT EDIT DIRECTLY - edit make_patchnum.pl instead
***************************************************************************/
@{[$describe ? "#define PERL_PATCHNUM \"$describe\"" : ()]}
#define PERL_GIT_UNPUSHED_COMMITS\t\t\\
$unpushed_commits/*leave-this-comment*/
@{[$changed ? "#define PERL_GIT_UNCOMMITTED_CHANGES" : ()]}
EOF_HEADER
######################################################################
# WARNING: 'lib/Config_git.pl' is generated by make_patchnum.pl
# DO NOT EDIT DIRECTLY - edit make_patchnum.pl instead
######################################################################
\$Config::Git_Data=<<'ENDOFGIT';
git_commit_id='$commit_id'
git_describe='$describe'
git_branch='$branch'
git_uncommitted_changes='$changed'
git_commit_id_title='$commit_title'
$extra_info
ENDOFGIT
EOF_CONFIG
# ex: set ts=8 sts=4 sw=4 et ft=perl:
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