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