CasperSecurity
#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0
#
# Treewide grep for references to files under Documentation, and report
# non-existing files in stderr.
use warnings;
use strict;
use Getopt::Long qw(:config no_auto_abbrev);
# NOTE: only add things here when the file was gone, but the text wants
# to mention a past documentation file, for example, to give credits for
# the original work.
my %false_positives = (
"Documentation/scsi/scsi_mid_low_api.rst" => "Documentation/Configure.help",
"drivers/vhost/vhost.c" => "Documentation/virtual/lguest/lguest.c",
);
my $scriptname = $0;
$scriptname =~ s,.*/([^/]+/),$1,;
# Parse arguments
my $help = 0;
my $fix = 0;
my $warn = 0;
if (! -e ".git") {
printf "Warning: can't check if file exists, as this is not a git tree\n";
exit 0;
}
GetOptions(
'fix' => \$fix,
'warn' => \$warn,
'h|help|usage' => \$help,
);
if ($help != 0) {
print "$scriptname [--help] [--fix]\n";
exit -1;
}
# Step 1: find broken references
print "Finding broken references. This may take a while... " if ($fix);
my %broken_ref;
my $doc_fix = 0;
open IN, "git grep ':doc:\`' Documentation/|"
or die "Failed to run git grep";
while (<IN>) {
next if (!m,^([^:]+):.*\:doc\:\`([^\`]+)\`,);
next if (m,sphinx/,);
my $file = $1;
my $d = $1;
my $doc_ref = $2;
my $f = $doc_ref;
$d =~ s,(.*/).*,$1,;
$f =~ s,.*\<([^\>]+)\>,$1,;
if ($f =~ m,^/,) {
$f = "$f.rst";
$f =~ s,^/,Documentation/,;
} else {
$f = "$d$f.rst";
}
next if (grep -e, glob("$f"));
if ($fix && !$doc_fix) {
print STDERR "\nWARNING: Currently, can't fix broken :doc:`` fields\n";
}
$doc_fix++;
print STDERR "$file: :doc:`$doc_ref`\n";
}
close IN;
open IN, "git grep 'Documentation/'|"
or die "Failed to run git grep";
while (<IN>) {
next if (!m/^([^:]+):(.*)/);
my $f = $1;
my $ln = $2;
# On linux-next, discard the Next/ directory
next if ($f =~ m,^Next/,);
# Makefiles and scripts contain nasty expressions to parse docs
next if ($f =~ m/Makefile/ || $f =~ m/\.sh$/);
# Skip this script
next if ($f eq $scriptname);
# Ignore the dir where documentation will be built
next if ($ln =~ m,\b(\S*)Documentation/output,);
if ($ln =~ m,\b(\S*)(Documentation/[A-Za-z0-9\_\.\,\~/\*\[\]\?+-]*)(.*),) {
my $prefix = $1;
my $ref = $2;
my $base = $2;
my $extra = $3;
# some file references are like:
# /usr/src/linux/Documentation/DMA-{API,mapping}.txt
# For now, ignore them
next if ($extra =~ m/^{/);
# Remove footnotes at the end like:
# Documentation/devicetree/dt-object-internal.txt[1]
$ref =~ s/(txt|rst)\[\d+]$/$1/;
# Remove ending ']' without any '['
$ref =~ s/\].*// if (!($ref =~ m/\[/));
# Remove puntuation marks at the end
$ref =~ s/[\,\.]+$//;
my $fulref = "$prefix$ref";
$fulref =~ s/^(\<file|ref)://;
$fulref =~ s/^[\'\`]+//;
$fulref =~ s,^\$\(.*\)/,,;
$base =~ s,.*/,,;
# Remove URL false-positives
next if ($fulref =~ m/^http/);
# Remove sched-pelt false-positive
next if ($fulref =~ m,^Documentation/scheduler/sched-pelt$,);
# Discard some build examples from Documentation/target/tcm_mod_builder.rst
next if ($fulref =~ m,mnt/sdb/lio-core-2.6.git/Documentation/target,);
# Check if exists, evaluating wildcards
next if (grep -e, glob("$ref $fulref"));
# Accept relative Documentation patches for tools/
if ($f =~ m/tools/) {
my $path = $f;
$path =~ s,(.*)/.*,$1,;
next if (grep -e, glob("$path/$ref $path/../$ref $path/$fulref"));
}
# Discard known false-positives
if (defined($false_positives{$f})) {
next if ($false_positives{$f} eq $fulref);
}
if ($fix) {
if (!($ref =~ m/(scripts|Kconfig|Kbuild)/)) {
$broken_ref{$ref}++;
}
} elsif ($warn) {
print STDERR "Warning: $f references a file that doesn't exist: $fulref\n";
} else {
print STDERR "$f: $fulref\n";
}
}
}
close IN;
exit 0 if (!$fix);
# Step 2: Seek for file name alternatives
print "Auto-fixing broken references. Please double-check the results\n";
foreach my $ref (keys %broken_ref) {
my $new =$ref;
my $basedir = ".";
# On translations, only seek inside the translations directory
$basedir = $1 if ($ref =~ m,(Documentation/translations/[^/]+),);
# get just the basename
$new =~ s,.*/,,;
my $f="";
# usual reason for breakage: DT file moved around
if ($ref =~ /devicetree/) {
# usual reason for breakage: DT file renamed to .yaml
if (!$f) {
my $new_ref = $ref;
$new_ref =~ s/\.txt$/.yaml/;
$f=$new_ref if (-f $new_ref);
}
if (!$f) {
my $search = $new;
$search =~ s,^.*/,,;
$f = qx(find Documentation/devicetree/ -iname "*$search*") if ($search);
if (!$f) {
# Manufacturer name may have changed
$search =~ s/^.*,//;
$f = qx(find Documentation/devicetree/ -iname "*$search*") if ($search);
}
}
}
# usual reason for breakage: file renamed to .rst
if (!$f) {
$new =~ s/\.txt$/.rst/;
$f=qx(find $basedir -iname $new) if ($new);
}
# usual reason for breakage: use dash or underline
if (!$f) {
$new =~ s/[-_]/[-_]/g;
$f=qx(find $basedir -iname $new) if ($new);
}
# Wild guess: seek for the same name on another place
if (!$f) {
$f = qx(find $basedir -iname $new) if ($new);
}
my @find = split /\s+/, $f;
if (!$f) {
print STDERR "ERROR: Didn't find a replacement for $ref\n";
} elsif (scalar(@find) > 1) {
print STDERR "WARNING: Won't auto-replace, as found multiple files close to $ref:\n";
foreach my $j (@find) {
$j =~ s,^./,,;
print STDERR " $j\n";
}
} else {
$f = $find[0];
$f =~ s,^./,,;
print "INFO: Replacing $ref to $f\n";
foreach my $j (qx(git grep -l $ref)) {
qx(sed "s\@$ref\@$f\@g" -i $j);
}
}
}