pacundo/pacundo.pl

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Perl
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#!/usr/bin/env perl
# Copyright (C) 2024 Ortega Froysa, Nicolás <nicolas@ortegas.org> All rights reserved.
# Author: Ortega Froysa, Nicolás <nicolas@ortegas.org>
#
# This software is provided 'as-is', without any express or implied
# warranty. In no event will the authors be held liable for any damages
# arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
#
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
#
# 3. This notice may not be removed or altered from any source
# distribution.
use strict;
use warnings;
use Getopt::Std;
use File::ReadBackwards;
my $VERSION = "1.0";
my $PROG_NAME = "pacundo";
sub print_version {
print("$PROG_NAME v$VERSION\n");
}
sub print_help {
&print_version();
print("A time machine to return your ArchLinux machine back to a working state.\n");
print("\nUSAGE:
$PROG_NAME [-i|-r] [-t <num>] [-d]
$PROG_NAME -h
$PROG_NAME -v
OPTIONS:
-i Enter interactive mode to select packages to downgrade [default behavior]
-r Automatically downgrade all packages from last upgrade
-t <num> Specify the number of transactions to include for undoing selection [default 1]
-d Dry run, i.e. don't actually do anything
-h Show this help information
-v Print program version\n");
}
getopts("irt:dvh", \my %opts);
if ($opts{'v'}) {
&print_version();
exit 0;
} elsif ($opts{'h'}) {
&print_help();
exit 0;
} elsif ($opts{'r'} && $opts{'i'}) {
print("Improper usage. -r and -i cannot be used at the same time.\n");
print("Use -h for help information.\n");
exit 1;
} elsif ($opts{'t'} && !($opts{'t'} =~ /[0-9]+/)) {
print("The argument for -t must be a positive integer.\n");
exit 1;
}
my $r_flag = $opts{'r'} // 0;
my $dry_run = $opts{'d'} // 0;
my $num_txs = $opts{'t'} // 1;
my $pacman_log = File::ReadBackwards->new("/var/log/pacman.log") or
die("Failed to load pacman log file.\n$!");
my $found_txs = 0;
my $in_tx = 0;
my @undo_txs;
while ($found_txs < $num_txs && defined(my $line = $pacman_log->readline)) {
# Remeber that we're reading this in reverse order
if (!$in_tx && $line =~ /\[ALPM\] transaction completed/) {
$in_tx = 1;
} elsif ($in_tx) {
if ($line =~ /\[ALPM\] transaction started/) {
$found_txs++;
$in_tx = 0;
} elsif ($line =~ /\[ALPM\] (upgraded|downgraded)/) {
my ($action, $pkg_name, $oldver, $newver) = $line =~ /\[ALPM\] (upgraded|downgraded) ([^\s]+) \((.*) -> (.*)\)/;
push(@undo_txs,
{
'action' => $action,
'pkg_name' => $pkg_name,
'oldver' => $oldver,
'newver' => $newver,
}
);
} elsif ($line =~ /\[ALPM\] (installed|removed)/) {
my ($action, $pkg_name) = $line =~ /\[ALPM\] (installed|removed) ([^\s]+)/;
push(@undo_txs,
{
'action' => $action,
'pkg_name' => $pkg_name,
}
);
}
}
}
# Interactive mode
if (!$r_flag) {
print("Last changes:\n");
my $n = 1;
foreach my $tx (@undo_txs) {
if ($tx->{action} =~ /(upgraded|downgraded)/) {
format UPGRFORMAT =
@|| @<< @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< @<<<<<<<<<<< -> @<<<<<<<<<<<<<
$n, $tx->{action}, $tx->{pkg_name}, $tx->{oldver}, $tx->{newver}
.
$~ = "UPGRFORMAT";
} else {
format INSTFORMAT =
@|| @<< @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
$n, $tx->{action}, $tx->{pkg_name}
.
$~ = "INSTFORMAT";
}
write();
$n++;
}
print("Select transactions to undo (e.g. '1 2 3', '1-3')\n");
print("> ");
my @sel = split(' ', <STDIN>);
foreach my $i (@sel) {
if ($i =~ /[0-9]-[0-9]/) {
my ($start, $end) = $i =~ /([0-9])-([0-9])/;
push(@sel, ($start..$end));
}
}
@sel = sort grep(!/[0-9]-[0-9]/, @sel);
my @sel_undo;
foreach my $i (@sel) {
push(@sel_undo, $undo_txs[$i-1]);
}
@undo_txs = @sel_undo;
}