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Current File : /proc/self/root/usr/share/perl5/Dpkg/Source/Package/V3/Git.pm
#
# git support for dpkg-source
#
# Copyright © 2007,2010 Joey Hess <joeyh@debian.org>.
# Copyright © 2008 Frank Lichtenheld <djpig@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

package Dpkg::Source::Package::V3::Git;

use strict;
use warnings;

our $VERSION = '0.02';

use Cwd qw(abs_path getcwd);
use File::Basename;
use File::Spec;
use File::Temp qw(tempdir);

use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use Dpkg::Exit qw(push_exit_handler pop_exit_handler);
use Dpkg::Path qw(find_command);
use Dpkg::Source::Functions qw(erasedir);

use parent qw(Dpkg::Source::Package);

our $CURRENT_MINOR_VERSION = '0';

# Remove variables from the environment that might cause git to do
# something unexpected.
delete $ENV{GIT_DIR};
delete $ENV{GIT_INDEX_FILE};
delete $ENV{GIT_OBJECT_DIRECTORY};
delete $ENV{GIT_ALTERNATE_OBJECT_DIRECTORIES};
delete $ENV{GIT_WORK_TREE};

sub prerequisites {
    return 1 if find_command('git');
    error(g_('cannot unpack git-format source package because ' .
             'git is not in the PATH'));
}

sub _check_workdir {
    my $srcdir = shift;

    if (! -d "$srcdir/.git") {
        error(g_('source directory is not the top directory of a git ' .
                 'repository (%s/.git not present), but Format git was ' .
                 'specified'), $srcdir);
    }
    if (-s "$srcdir/.gitmodules") {
        error(g_('git repository %s uses submodules; this is not yet supported'),
              $srcdir);
    }

    return 1;
}

sub _parse_vcs_git {
    my $vcs_git = shift;
    my ($url, $opt, $branch) = split ' ', $vcs_git;

    if (defined $opt && $opt eq '-b' && defined $branch) {
        return ($url, $branch);
    } else {
        return ($url);
    }
}

my @module_cmdline = (
    {
        name => '--git-ref=<ref>',
        help => N_('specify a git <ref> to include in the git bundle'),
        when => 'build',
    }, {
        name => '--git-depth=<number>',
        help => N_('create a shallow clone with <number> depth'),
        when => 'build',
    }
);

sub describe_cmdline_options {
    my $self = shift;

    my @cmdline = ( $self->SUPER::describe_cmdline_options(), @module_cmdline );

    return @cmdline;
}

sub parse_cmdline_option {
    my ($self, $opt) = @_;
    return 1 if $self->SUPER::parse_cmdline_option($opt);
    if ($opt =~ /^--git-ref=(.*)$/) {
        push @{$self->{options}{git_ref}}, $1;
        return 1;
    } elsif ($opt =~ /^--git-depth=(\d+)$/) {
        $self->{options}{git_depth} = $1;
        return 1;
    }
    return 0;
}

sub can_build {
    my ($self, $dir) = @_;

    return (0, g_("doesn't contain a git repository")) unless -d "$dir/.git";
    return 1;
}

sub do_build {
    my ($self, $dir) = @_;
    my $diff_ignore_regex = $self->{options}{diff_ignore_regex};

    $dir =~ s{/+$}{}; # Strip trailing /
    my ($dirname, $updir) = fileparse($dir);
    my $basenamerev = $self->get_basename(1);

    _check_workdir($dir);

    my $old_cwd = getcwd();
    chdir $dir or syserr(g_("unable to chdir to '%s'"), $dir);

    # Check for uncommitted files.
    # To support dpkg-source -i, get a list of files
    # equivalent to the ones git status finds, and remove any
    # ignored files from it.
    my @ignores = '--exclude-per-directory=.gitignore';
    my $core_excludesfile = qx(git config --get core.excludesfile);
    chomp $core_excludesfile;
    if (length $core_excludesfile && -e $core_excludesfile) {
        push @ignores, "--exclude-from=$core_excludesfile";
    }
    if (-e '.git/info/exclude') {
        push @ignores, '--exclude-from=.git/info/exclude';
    }
    open(my $git_ls_files_fh, '-|', 'git', 'ls-files', '--modified', '--deleted',
         '-z', '--others', @ignores) or subprocerr('git ls-files');
    my @files;
    {
      local $_;
      local $/ = "\0";
      while (<$git_ls_files_fh>) {
          chomp;
          if (! length $diff_ignore_regex ||
              ! m/$diff_ignore_regex/o) {
              push @files, $_;
          }
      }
    }
    close($git_ls_files_fh) or syserr(g_('git ls-files exited nonzero'));
    if (@files) {
        error(g_('uncommitted, not-ignored changes in working directory: %s'),
              join(' ', @files));
    }

    # If a depth was specified, need to create a shallow clone and
    # bundle that.
    my $tmp;
    my $shallowfile;
    if ($self->{options}{git_depth}) {
        chdir $old_cwd or syserr(g_("unable to chdir to '%s'"), $old_cwd);
        $tmp = tempdir("$dirname.git.XXXXXX", DIR => $updir);
        push_exit_handler(sub { erasedir($tmp) });
        my $clone_dir = "$tmp/repo.git";
        # file:// is needed to avoid local cloning, which does not
        # create a shallow clone.
        info(g_('creating shallow clone with depth %s'),
                $self->{options}{git_depth});
        system('git', 'clone', '--depth=' . $self->{options}{git_depth},
               '--quiet', '--bare', 'file://' . abs_path($dir), $clone_dir);
        subprocerr('git clone') if $?;
        chdir($clone_dir)
            or syserr(g_("unable to chdir to '%s'"), $clone_dir);
        $shallowfile = "$basenamerev.gitshallow";
        system('cp', '-f', 'shallow', "$old_cwd/$shallowfile");
        subprocerr('cp shallow') if $?;
    }

    # Create the git bundle.
    my $bundlefile = "$basenamerev.git";
    my @bundle_arg = $self->{options}{git_ref} ?
        (@{$self->{options}{git_ref}}) : '--all';
    info(g_('bundling: %s'), join(' ', @bundle_arg));
    system('git', 'bundle', 'create', "$old_cwd/$bundlefile",
           @bundle_arg,
           'HEAD', # ensure HEAD is included no matter what
           '--', # avoids ambiguity error when referring to eg, a debian branch
    );
    subprocerr('git bundle') if $?;

    chdir $old_cwd or syserr(g_("unable to chdir to '%s'"), $old_cwd);

    if (defined $tmp) {
        erasedir($tmp);
        pop_exit_handler();
    }

    $self->add_file($bundlefile);
    if (defined $shallowfile) {
        $self->add_file($shallowfile);
    }
}

sub do_extract {
    my ($self, $newdirectory) = @_;
    my $fields = $self->{fields};

    my $basenamerev = $self->get_basename(1);

    my @files = $self->get_files();
    my ($bundle, $shallow);
    foreach my $file (@files) {
        if ($file =~ /^\Q$basenamerev\E\.git$/) {
            if (! defined $bundle) {
                $bundle = $file;
            } else {
                error(g_('format v3.0 (git) uses only one .git file'));
            }
        } elsif ($file =~ /^\Q$basenamerev\E\.gitshallow$/) {
            if (! defined $shallow) {
                $shallow = $file;
            } else {
                error(g_('format v3.0 (git) uses only one .gitshallow file'));
            }
        } else {
            error(g_('format v3.0 (git) unknown file: %s'), $file);
        }
    }
    if (! defined $bundle) {
        error(g_('format v3.0 (git) expected %s'), "$basenamerev.git");
    }

    if ($self->{options}{no_overwrite_dir} and -e $newdirectory) {
        error(g_('unpack target exists: %s'), $newdirectory);
    } else {
        erasedir($newdirectory);
    }

    # Extract git bundle.
    info(g_('cloning %s'), $bundle);
    my $bundle_path = File::Spec->catfile($self->{basedir}, $bundle);
    system('git', 'clone', '--quiet', '--origin=bundle', $bundle_path, $newdirectory);
    subprocerr('git bundle') if $?;

    if (defined $shallow) {
        # Move shallow info file into place, so git does not
        # try to follow parents of shallow refs.
        info(g_('setting up shallow clone'));
        my $shallow_orig = File::Spec->catfile($self->{basedir}, $shallow);
        my $shallow_dest = File::Spec->catfile($newdirectory, '.git', 'shallow');
        system('cp', '-f',  $shallow_orig, $shallow_dest);
        subprocerr('cp') if $?;
    }

    _check_workdir($newdirectory);

    if (defined $fields->{'Vcs-Git'}) {
        my $remote = 'origin';
        my ($url, $head) = _parse_vcs_git($fields->{'Vcs-Git'});

        my @git_remote_add = (qw(git -C), $newdirectory, qw(remote add));
        push @git_remote_add, '-m', $head if defined $head;

        info(g_('setting remote %s to %s'), $remote, $url);
        system(@git_remote_add, $remote, $url);
        subprocerr('git remote add') if $?;
    }
}

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