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#!/usr/bin/env perl
# Copyright (c) MediaTek USA Inc., 2022-2024
#
# 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
# <http://www.gnu.org/licenses/>.
#
#
# gitversion [--p4] [--md5] [--local-change] [--prefix path] pathname OR
# gitversion [--p4] [--md5] [--prefix path] --compare old_version new_version pathname
#
# If the '--p4' flag is used:
# we assume that the GIT repo is cloned from Perforce - and look for
# the line in the generated commit log message which tells us the perforce
# changelist ID that we actually want.
# if the '--local-change' flag is used:
# we assume that there may be local changes which are not committed to
# the repo. If flag is not set: do not check for local change
# If specified, 'path' is prependied to 'pathname' (as 'path/pathname')
# before processing.
# This is a sample script which uses git commands to determine
# the version of the filename parameter.
# Version information (if present) is used during ".info" file merging
# to verify that the data the user is attempting to merge is for the same
# source code/same version.
# If the version is not the same - then line numbers, etc. may be different
# and some very strange errors may occur.
package gitversion;
use strict;
use POSIX qw(strftime);
use File::Spec;
use Cwd qw(abs_path);
use File::Basename qw(dirname basename);
use Getopt::Long qw(GetOptionsFromArray);
use annotateutil qw(get_modify_time compute_md5);
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(new extract_version compare_version usage);
use constant {
MD5 => 0,
P4 => 1,
PREFIX => 2,
ALLOW_MISSING => 3,
CHECK_LOCAL_CHANGE => 4,
};
sub usage
{
my $exe = shift;
$exe = basename($exe);
print(STDERR<<EOF);
usage: $exe --compare old_version new_version filename OR
$exe [--md5] [--p4] [--prefix path] [--local-change] \
[--allow-missing] filename
EOF
}
sub new
{
my $class = shift;
my $script = shift;
my @args = @_;
my $compare;
my $use_md5; # if set, append md5 checksum to the P4 version string
my $mapp4;
my $prefix;
my $allow_missing;
my $help;
my $local_change;
if (!GetOptionsFromArray(\@_,
"--compare" => \$compare,
"--md5" => \$use_md5,
"--p4" => \$mapp4,
'--prefix:s' => \$prefix,
'--allow-missing' => \$allow_missing,
'--local-change' => \$local_change,
'--help' => \$help) ||
$help ||
$compare && scalar(@_) != 3
) {
usage($script);
exit(defined($help) ? 0 : 1) if ($script eq $0);
return undef;
}
my $self = [$use_md5, $mapp4, $prefix, $allow_missing, $local_change];
return bless $self, $class;
}
sub extract_version
{
my ($self, $filename) = @_;
if (!File::Spec->file_name_is_absolute($filename) &&
defined($self->[PREFIX])) {
$filename = File::Spec->catfile($self->[PREFIX], $filename);
}
unless (-e $filename) {
if ($self->[ALLOW_MISSING]) {
return ''; # empty string
}
die("Error: $filename does not exist - perhaps you need the '--allow-missing' flag"
);
}
my $pathname = abs_path($filename);
my $null = File::Spec->devnull();
my $dir = dirname($pathname);
my $file = basename($pathname);
-d $dir or die("no such directory '$dir'");
my $version;
if (0 == system("cd $dir ; git rev-parse --show-toplevel >$null 2>&1")) {
# in a git repo - use full SHA.
my $log = `cd $dir ; git log --no-abbrev --oneline -1 $file 2>$null`;
if (0 == $? &&
$log =~ /^(\S+) /) {
$version = $1;
if ($self->[P4]) {
if (open(GITLOG, '-|', "cd $dir ; git show -s $version")) {
while (my $l = <GITLOG>) {
# p4sync puts special comment in commit log.
# pull the CL out of that.
if ($l =~ /git-p4:.+change = ([0-9]+)/) {
$version = "CL $1";
last;
}
}
} else {
die("unable to execute 'git show -s $version': $!");
}
close(GITLOG) or die("unable to close");
if (0 != $?) {
$? & 0x7F &
die("git show died from signal ", ($? & 0x7F), "\n");
die("git show exited with error ", ($? >> 8), "\n");
}
} else {
$version = "SHA $version";
}
if ($self->[CHECK_LOCAL_CHANGE]) {
my $diff = `cd $dir ; git diff $file 2>$null`;
if ('' ne $diff) {
$version .= ' edited ' . get_modify_time($file);
$version .= ' md5:' . compute_md5($pathname)
if $self->[MD5];
}
}
}
}
if (!$version) {
# not in git - just print the modify time, so we have a prayer of
# noticing file differences
$version = get_modify_time($pathname);
$version .= ' md5:' . compute_md5($pathname)
if ($self->[MD5]);
}
return $version;
}
sub compare_version
{
my ($self, $new, $old, $filename) = @_;
if ($self->[MD5] &&
( $old !~ /^SHA/ ||
($self->[P4] &&
$old !~ /^CL/)) &&
$old =~ / md5:(.+)$/
) {
my $o = $1;
if ($new =~ / md5:(.+)$/) {
return ($o ne $1);
}
# otherwise: 'new' was not an MD5 signature - so fall through to exact match
}
return $old ne $new; # just look for exact match
}
1;
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