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Refactoring how we exec commands in chroot to make it less error prone.

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Sergiotarxz 2023-10-01 11:45:16 +02:00
parent 0c2a06934b
commit 09039d1900
2 changed files with 99 additions and 88 deletions
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37
lib/BaseUtils.pm Normal file
View File

@ -0,0 +1,37 @@
package BaseUtils;
use v5.36.0;
use strict;
use warnings;
use utf8;
use Moo;
sub forkWait($self) {
my $pid = fork;
if ($pid) {
return sub {
wait;
my $return_code = $?;
return $return_code;
};
}
return;
}
sub chroot($self, $target) {
chroot "$target";
chdir '/';
}
sub execChroot($self, $target, @command) {
my $parent_subroutine = $self->forkWait();
if (defined $parent_subroutine) {
return $parent_subroutine->();
}
$self->chroot($target);
my $return_code = system @command;
exit $return_code;
}
1;

150
prepare_system.pl
View File

@ -7,88 +7,82 @@ use warnings;
use utf8;
use Path::Tiny;
use lib path(__FILE__)->parent->child('lib') . '';
use BaseUtils;
my $utils = BaseUtils->new;
main();
sub main {
die 'Must be superuser.' if $< != 0;
my $target_dir = shift @ARGV or die 'No target dir passed.';
my $target_dir = shift @ARGV or die 'No target dir passed.';
my $rebuild_bin = shift @ARGV // 0;
$target_dir = path($target_dir);
my $gentoo_conf = path('gentoo.conf');
my $make_conf = path('make.conf');
my $make_conf = path('make.conf');
my $resolv_conf = path('/etc/resolv.conf');
my $zz_use = path('zz-use');
my $zz_use = path('zz-use');
my $packages = _readPackagesToInstall();
_checkValidSystem($target_dir);
my $make_conf_changed = _installMakeConf( $target_dir, $make_conf );
_installGentooConf($target_dir, $gentoo_conf);
_installResolvConf($target_dir,$resolv_conf);
my $package_use_changed = _installPackageUse($target_dir, $zz_use);
_installMakeConf( $target_dir, $make_conf );
_installGentooConf( $target_dir, $gentoo_conf );
_installResolvConf( $target_dir, $resolv_conf );
_installPackageUse( $target_dir, $zz_use );
_mountNecessaryFilesystems($target_dir);
_webrsync($target_dir);
if ($rebuild_bin && $package_use_changed || $make_conf_changed) {
if ( $rebuild_bin ) {
_rebuildBinaries($target_dir);
}
_updateSystem($target_dir);
_depclean($target_dir);
_installNeededPackages($target_dir, $packages);
_installNeededPackages( $target_dir, $packages );
}
sub _depclean($target) {
_forkWait() or return;
_chroot($target);
my $return_code = system 'emerge', '--depclean';
if ($return_code != 0) {
sub _depclean ($target) {
my $return_code = $utils->execChroot( $target, 'emerge', '--depclean' );
if ( $return_code != 0 ) {
die 'Unable to depclean system.';
}
exit 0;
}
sub _updateSystem($target) {
_forkWait() or return;
_chroot($target);
my $return_code = system 'emerge', '-uUDN', '@world';
if ($return_code != 0) {
sub _updateSystem ($target) {
my $return_code =
$utils->execChroot( $target, 'emerge', '-uUDN', '@world' );
if ( $return_code != 0 ) {
die 'Unable to update the system.';
}
exit 0;
}
sub _rebuildBinaries($target) {
_forkWait() or return;
_chroot($target);
my $return_code = system 'emerge', '-e', '@system';
if ($return_code != 0) {
sub _rebuildBinaries ($target) {
my $return_code = $utils->execChroot( $target, 'emerge', '-e', '@system' );
if ( $return_code != 0 ) {
die 'Unable to rebuild binaries for system.';
}
my $return_code = system 'emerge', '-e', '@world';
if ($return_code != 0) {
$return_code = $utils->execChroot( $target, 'emerge', '-e', '@world' );
if ( $return_code != 0 ) {
die 'Unable to rebuild binaries for world.';
}
exit 0;
}
sub _installNeededPackages($target, $packages) {
_forkWait() or return;
_chroot($target);
my $return_code = system 'emerge', '--noreplace', @$packages;
if ($return_code != 0) {
exit $return_code;
sub _installNeededPackages ( $target, $packages ) {
my $return_code =
$utils->execChroot( $target, 'emerge', '--noreplace', @$packages );
if ( $return_code != 0 ) {
die 'Unable to install needed packages.';
}
exit 0;
}
sub _readPackagesToInstall {
my @packages;
open my $fh, '<', 'packages';
while (my $line = <$fh>) {
while ( my $line = <$fh> ) {
chomp $line;
push @packages, $line;
}
@ -96,62 +90,42 @@ sub _readPackagesToInstall {
return \@packages;
}
sub _forkWait {
my $pid = fork;
if ($pid) {
wait;
my $return_code = $?;
if ($? != 0) {
exit $?;
}
return 0;
sub _webrsync ($target) {
my $return_code = $utils->execChroot( $target, 'emerge-webrsync' );
if ( $return_code != 0 ) {
die 'Unable to webrsync.';
}
return 1;
}
sub _webrsync($target) {
_forkWait() or return;
_chroot($target);
my $return_code = system 'emerge-webrsync';
if ($return_code != 0) {
return $return_code;
}
exit 0;
}
sub _chroot($target) {
chroot "$target";
chdir '/';
}
sub _mountNecessaryFilesystems($target) {
sub _mountNecessaryFilesystems ($target) {
my $dest_proc = $target->child('proc');
my $dest_dev = $target->child('dev');
my $dest_sys = $target->child('sys');
my $dest_dev = $target->child('dev');
my $dest_sys = $target->child('sys');
_mountType('proc', $dest_proc) if !_checkMounted($dest_proc);
_mountType('sysfs', $dest_sys) if !_checkMounted($dest_sys);
_mountRbind('/dev', $dest_dev) if !_checkMounted($dest_dev);
_mountType( 'proc', $dest_proc ) if !_checkMounted($dest_proc);
_mountType( 'sysfs', $dest_sys ) if !_checkMounted($dest_sys);
_mountRbind( '/dev', $dest_dev ) if !_checkMounted($dest_dev);
}
sub _checkMounted($fs) {
sub _checkMounted ($fs) {
$fs = $fs->realpath;
my $return = index(_getMounts(), $fs) != -1;
my $return = index( _getMounts(), $fs ) != -1;
say "$fs is mounted." if $return;
return $return;
}
sub _mountRbind($source, $fs) {
sub _mountRbind ( $source, $fs ) {
my $return_code = system 'sudo', 'mount', '--rbind', $source, $fs;
if ($return_code != 0) {
if ( $return_code != 0 ) {
die "Unable to mount $fs.";
}
}
{
my $mounts;
sub _getMounts {
if (!defined $mounts) {
if ( !defined $mounts ) {
open my $fh, '-|', 'sudo', 'mount';
$mounts = join '', <$fh>;
close $fh;
@ -160,9 +134,9 @@ sub _mountRbind($source, $fs) {
}
}
sub _mountType($fs_type, $fs) {
sub _mountType ( $fs_type, $fs ) {
my $return_code = system 'sudo', 'mount', '-t', $fs_type, $fs_type, $fs;
if ($return_code != 0) {
if ( $return_code != 0 ) {
die "Unable to mount $fs.";
}
}
@ -173,37 +147,37 @@ sub _checkValidSystem ($target) {
}
}
sub _installResolvConf($target, $resolv_conf) {
sub _installResolvConf ( $target, $resolv_conf ) {
my $dest_resolv_conf = $target->child('etc/resolv.conf');
_install($resolv_conf, $dest_resolv_conf);
_install( $resolv_conf, $dest_resolv_conf );
}
sub _installGentooConf($target, $gentoo_conf) {
sub _installGentooConf ( $target, $gentoo_conf ) {
my $dest_gentoo_conf = $target->child('etc/portage/repos.conf/gentoo.conf');
my $repos_conf = $dest_gentoo_conf->parent;
my $return_code = system 'sudo', 'mkdir', '-p', $repos_conf;
if ($return_code != 0) {
my $repos_conf = $dest_gentoo_conf->parent;
my $return_code = system 'sudo', 'mkdir', '-p', $repos_conf;
if ( $return_code != 0 ) {
say "Unable to create $repos_conf.";
}
_install($gentoo_conf, $dest_gentoo_conf);
_install( $gentoo_conf, $dest_gentoo_conf );
}
sub _installPackageUse($target, $zz_use) {
sub _installPackageUse ( $target, $zz_use ) {
my $dest_zz_use = $target->child('etc/portage/package.use/zz-use');
my $package_use = $dest_zz_use->parent;
my $return_code = system 'sudo', 'mkdir', '-p', $package_use;
if ($return_code != 0) {
if ( $return_code != 0 ) {
say "Unable to create $package_use.";
}
_install($zz_use, $dest_zz_use);
_install( $zz_use, $dest_zz_use );
}
sub _installMakeConf ( $target, $make_conf ) {
my $dest_make_conf = $target->child('etc/portage/make.conf');
return _install($make_conf, $dest_make_conf);
return _install( $make_conf, $dest_make_conf );
}
sub _install($source, $dest) {
sub _install ( $source, $dest ) {
if ( -e $dest
&& _getSha512SumFile($dest) eq _getSha512SumFile($source) )
{