/usr/lib/git-core/git-cvsexportcommit is in git-cvs 1:1.7.9.5-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 | #!/usr/bin/perl
use lib (split(/:/, $ENV{GITPERLLIB} || "/usr/share/perl/5.14.2"));
use 5.008;
use strict;
use warnings;
use Getopt::Std;
use File::Temp qw(tempdir);
use Data::Dumper;
use File::Basename qw(basename dirname);
use File::Spec;
use Git;
our ($opt_h, $opt_P, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m, $opt_d, $opt_u, $opt_w, $opt_W, $opt_k);
getopts('uhPpvcfkam:d:w:W');
$opt_h && usage();
die "Need at least one commit identifier!" unless @ARGV;
# Get git-config settings
my $repo = Git->repository();
$opt_w = $repo->config('cvsexportcommit.cvsdir') unless defined $opt_w;
if ($opt_w || $opt_W) {
# Remember where GIT_DIR is before changing to CVS checkout
unless ($ENV{GIT_DIR}) {
# No GIT_DIR set. Figure it out for ourselves
my $gd =`git-rev-parse --git-dir`;
chomp($gd);
$ENV{GIT_DIR} = $gd;
}
# On MSYS, convert a Windows-style path to an MSYS-style path
# so that rel2abs() below works correctly.
if ($^O eq 'msys') {
$ENV{GIT_DIR} =~ s#^([[:alpha:]]):/#/$1/#;
}
# Make sure GIT_DIR is absolute
$ENV{GIT_DIR} = File::Spec->rel2abs($ENV{GIT_DIR});
}
if ($opt_w) {
if (! -d $opt_w."/CVS" ) {
die "$opt_w is not a CVS checkout";
}
chdir $opt_w or die "Cannot change to CVS checkout at $opt_w";
}
unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){
die "GIT_DIR is not defined or is unreadable";
}
my @cvs;
if ($opt_d) {
@cvs = ('cvs', '-d', $opt_d);
} else {
@cvs = ('cvs');
}
# resolve target commit
my $commit;
$commit = pop @ARGV;
$commit = safe_pipe_capture('git-rev-parse', '--verify', "$commit^0");
chomp $commit;
if ($?) {
die "The commit reference $commit did not resolve!";
}
# resolve what parent we want
my $parent;
if (@ARGV) {
$parent = pop @ARGV;
$parent = safe_pipe_capture('git-rev-parse', '--verify', "$parent^0");
chomp $parent;
if ($?) {
die "The parent reference did not resolve!";
}
}
# find parents from the commit itself
my @commit = safe_pipe_capture('git-cat-file', 'commit', $commit);
my @parents;
my $committer;
my $author;
my $stage = 'headers'; # headers, msg
my $title;
my $msg = '';
foreach my $line (@commit) {
chomp $line;
if ($stage eq 'headers' && $line eq '') {
$stage = 'msg';
next;
}
if ($stage eq 'headers') {
if ($line =~ m/^parent (\w{40})$/) { # found a parent
push @parents, $1;
} elsif ($line =~ m/^author (.+) \d+ [-+]\d+$/) {
$author = $1;
} elsif ($line =~ m/^committer (.+) \d+ [-+]\d+$/) {
$committer = $1;
}
} else {
$msg .= $line . "\n";
unless ($title) {
$title = $line;
}
}
}
my $noparent = "0000000000000000000000000000000000000000";
if ($parent) {
my $found;
# double check that it's a valid parent
foreach my $p (@parents) {
if ($p eq $parent) {
$found = 1;
last;
}; # found it
}
die "Did not find $parent in the parents for this commit!" if !$found and !$opt_P;
} else { # we don't have a parent from the cmdline...
if (@parents == 1) { # it's safe to get it from the commit
$parent = $parents[0];
} elsif (@parents == 0) { # there is no parent
$parent = $noparent;
} else { # cannot choose automatically from multiple parents
die "This commit has more than one parent -- please name the parent you want to use explicitly";
}
}
my $go_back_to = 0;
if ($opt_W) {
$opt_v && print "Resetting to $parent\n";
$go_back_to = `git symbolic-ref HEAD 2> /dev/null ||
git rev-parse HEAD` || die "Could not determine current branch";
system("git checkout -q $parent^0") && die "Could not check out $parent^0";
}
$opt_v && print "Applying to CVS commit $commit from parent $parent\n";
# grab the commit message
open(MSG, ">.msg") or die "Cannot open .msg for writing";
if ($opt_m) {
print MSG $opt_m;
}
print MSG $msg;
if ($opt_a) {
print MSG "\n\nAuthor: $author\n";
if ($author ne $committer) {
print MSG "Committer: $committer\n";
}
}
close MSG;
if ($parent eq $noparent) {
`git-diff-tree --binary -p --root $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
} else {
`git-diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
}
## apply non-binary changes
# In pedantic mode require all lines of context to match. In normal
# mode, be compatible with diff/patch: assume 3 lines of context and
# require at least one line match, i.e. ignore at most 2 lines of
# context, like diff/patch do by default.
my $context = $opt_p ? '' : '-C1';
print "Checking if patch will apply\n";
my @stat;
open APPLY, "GIT_DIR= git-apply $context --summary --numstat<.cvsexportcommit.diff|" || die "cannot patch";
@stat=<APPLY>;
close APPLY || die "Cannot patch";
my (@bfiles,@files,@afiles,@dfiles);
chomp @stat;
foreach (@stat) {
push (@bfiles,$1) if m/^-\t-\t(.*)$/;
push (@files, $1) if m/^-\t-\t(.*)$/;
push (@files, $1) if m/^\d+\t\d+\t(.*)$/;
push (@afiles,$1) if m/^ create mode [0-7]+ (.*)$/;
push (@dfiles,$1) if m/^ delete mode [0-7]+ (.*)$/;
}
map { s/^"(.*)"$/$1/g } @bfiles,@files;
map { s/\\([0-7]{3})/sprintf('%c',oct $1)/eg } @bfiles,@files;
# check that the files are clean and up to date according to cvs
my $dirty;
my @dirs;
foreach my $p (@afiles) {
my $path = dirname $p;
while (!-d $path and ! grep { $_ eq $path } @dirs) {
unshift @dirs, $path;
$path = dirname $path;
}
}
# ... check dirs,
foreach my $d (@dirs) {
if (-e $d) {
$dirty = 1;
warn "$d exists and is not a directory!\n";
}
}
# ... query status of all files that we have a directory for and parse output of 'cvs status' to %cvsstat.
my @canstatusfiles;
foreach my $f (@files) {
my $path = dirname $f;
next if (grep { $_ eq $path } @dirs);
push @canstatusfiles, $f;
}
my %cvsstat;
if (@canstatusfiles) {
if ($opt_u) {
my @updated = xargs_safe_pipe_capture([@cvs, 'update'], @canstatusfiles);
print @updated;
}
# "cvs status" reorders the parameters, notably when there are multiple
# arguments with the same basename. So be precise here.
my %added = map { $_ => 1 } @afiles;
my %todo = map { $_ => 1 } @canstatusfiles;
while (%todo) {
my @canstatusfiles2 = ();
my %fullname = ();
foreach my $name (keys %todo) {
my $basename = basename($name);
# CVS reports files that don't exist in the current revision as
# "no file $basename" in its "status" output, so we should
# anticipate that. Totally unknown files will have a status
# "Unknown". However, if they exist in the Attic, their status
# will be "Up-to-date" (this means they were added once but have
# been removed).
$basename = "no file $basename" if $added{$basename};
$basename =~ s/^\s+//;
$basename =~ s/\s+$//;
if (!exists($fullname{$basename})) {
$fullname{$basename} = $name;
push (@canstatusfiles2, $name);
delete($todo{$name});
}
}
my @cvsoutput;
@cvsoutput = xargs_safe_pipe_capture([@cvs, 'status'], @canstatusfiles2);
foreach my $l (@cvsoutput) {
chomp $l;
next unless
my ($file, $status) = $l =~ /^File:\s+(.*\S)\s+Status: (.*)$/;
my $fullname = $fullname{$file};
print STDERR "Huh? Status '$status' reported for unexpected file '$file'\n"
unless defined $fullname;
# This response means the file does not exist except in
# CVS's attic, so set the status accordingly
$status = "In-attic"
if $file =~ /^no file /
&& $status eq 'Up-to-date';
$cvsstat{$fullname{$file}} = $status
if defined $fullname{$file};
}
}
}
# ... Validate that new files have the correct status
foreach my $f (@afiles) {
next unless defined(my $stat = $cvsstat{$f});
# This means the file has never been seen before
next if $stat eq 'Unknown';
# This means the file has been seen before but was removed
next if $stat eq 'In-attic';
$dirty = 1;
warn "File $f is already known in your CVS checkout -- perhaps it has been added by another user. Or this may indicate that it exists on a different branch. If this is the case, use -f to force the merge.\n";
warn "Status was: $cvsstat{$f}\n";
}
# ... validate known files.
foreach my $f (@files) {
next if grep { $_ eq $f } @afiles;
# TODO:we need to handle removed in cvs
unless (defined ($cvsstat{$f}) and $cvsstat{$f} eq "Up-to-date") {
$dirty = 1;
warn "File $f not up to date but has status '$cvsstat{$f}' in your CVS checkout!\n";
}
# Depending on how your GIT tree got imported from CVS you may
# have a conflict between expanded keywords in your CVS tree and
# unexpanded keywords in the patch about to be applied.
if ($opt_k) {
my $orig_file ="$f.orig";
rename $f, $orig_file;
open(FILTER_IN, "<$orig_file") or die "Cannot open $orig_file\n";
open(FILTER_OUT, ">$f") or die "Cannot open $f\n";
while (<FILTER_IN>)
{
my $line = $_;
$line =~ s/\$([A-Z][a-z]+):[^\$]+\$/\$$1\$/g;
print FILTER_OUT $line;
}
close FILTER_IN;
close FILTER_OUT;
}
}
if ($dirty) {
if ($opt_f) { warn "The tree is not clean -- forced merge\n";
$dirty = 0;
} else {
die "Exiting: your CVS tree is not clean for this merge.";
}
}
print "Applying\n";
if ($opt_W) {
system("git checkout -q $commit^0") && die "cannot patch";
} else {
`GIT_DIR= git-apply $context --summary --numstat --apply <.cvsexportcommit.diff` || die "cannot patch";
}
print "Patch applied successfully. Adding new files and directories to CVS\n";
my $dirtypatch = 0;
#
# We have to add the directories in order otherwise we will have
# problems when we try and add the sub-directory of a directory we
# have not added yet.
#
# Luckily this is easy to deal with by sorting the directories and
# dealing with the shortest ones first.
#
@dirs = sort { length $a <=> length $b} @dirs;
foreach my $d (@dirs) {
if (system(@cvs,'add',$d)) {
$dirtypatch = 1;
warn "Failed to cvs add directory $d -- you may need to do it manually";
}
}
foreach my $f (@afiles) {
if (grep { $_ eq $f } @bfiles) {
system(@cvs, 'add','-kb',$f);
} else {
system(@cvs, 'add', $f);
}
if ($?) {
$dirtypatch = 1;
warn "Failed to cvs add $f -- you may need to do it manually";
}
}
foreach my $f (@dfiles) {
system(@cvs, 'rm', '-f', $f);
if ($?) {
$dirtypatch = 1;
warn "Failed to cvs rm -f $f -- you may need to do it manually";
}
}
print "Commit to CVS\n";
print "Patch title (first comment line): $title\n";
my @commitfiles = map { unless (m/\s/) { '\''.$_.'\''; } else { $_; }; } (@files);
my $cmd = join(' ', @cvs)." commit -F .msg @commitfiles";
if ($dirtypatch) {
print "NOTE: One or more hunks failed to apply cleanly.\n";
print "You'll need to apply the patch in .cvsexportcommit.diff manually\n";
print "using a patch program. After applying the patch and resolving the\n";
print "problems you may commit using:";
print "\n cd \"$opt_w\"" if $opt_w;
print "\n $cmd\n";
print "\n git checkout $go_back_to\n" if $go_back_to;
print "\n";
exit(1);
}
if ($opt_c) {
print "Autocommit\n $cmd\n";
print xargs_safe_pipe_capture([@cvs, 'commit', '-F', '.msg'], @files);
if ($?) {
die "Exiting: The commit did not succeed";
}
print "Committed successfully to CVS\n";
# clean up
unlink(".msg");
} else {
print "Ready for you to commit, just run:\n\n $cmd\n";
}
# clean up
unlink(".cvsexportcommit.diff");
if ($opt_W) {
system("git checkout $go_back_to") && die "cannot move back to $go_back_to";
if (!($go_back_to =~ /^[0-9a-fA-F]{40}$/)) {
system("git symbolic-ref HEAD $go_back_to") &&
die "cannot move back to $go_back_to";
}
}
# CVS version 1.11.x and 1.12.x sleeps the wrong way to ensure the timestamp
# used by CVS and the one set by subsequence file modifications are different.
# If they are not different CVS will not detect changes.
sleep(1);
sub usage {
print STDERR <<END;
Usage: GIT_DIR=/path/to/.git git cvsexportcommit [-h] [-p] [-v] [-c] [-f] [-u] [-k] [-w cvsworkdir] [-m msgprefix] [ parent ] commit
END
exit(1);
}
# An alternative to `command` that allows input to be passed as an array
# to work around shell problems with weird characters in arguments
# if the exec returns non-zero we die
sub safe_pipe_capture {
my @output;
if (my $pid = open my $child, '-|') {
@output = (<$child>);
close $child or die join(' ',@_).": $! $?";
} else {
exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
}
return wantarray ? @output : join('',@output);
}
sub xargs_safe_pipe_capture {
my $MAX_ARG_LENGTH = 65536;
my $cmd = shift;
my @output;
my $output;
while(@_) {
my @args;
my $length = 0;
while(@_ && $length < $MAX_ARG_LENGTH) {
push @args, shift;
$length += length($args[$#args]);
}
if (wantarray) {
push @output, safe_pipe_capture(@$cmd, @args);
}
else {
$output .= safe_pipe_capture(@$cmd, @args);
}
}
return wantarray ? @output : $output;
}
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