3 # Script to help with fallout from #849041.
6 # dgit-badcommit-fixup --check
7 # dgit-badcommit-fixup --test
8 # dgit-badcommit-fixup --real
10 # Update procedure, from server operator's point of view:
12 # 1. Test in an offline tree that this DTRT
14 # 2. Announce a transition time. Tell everyone that between
15 # the transition time and their next upload, they must
18 # 3. At the transition time, run this script in every repo.
20 # 4. Run the mirror script to push changes, if necessary.
22 END { $? = $Debian::Dgit::ExitStatus::desired // -1; };
23 use Debian::Dgit::ExitStatus;
31 our $our_version = 'UNRELEASED'; ###substituted###
35 foreach my $a (@ARGV) {
38 } elsif ($a eq '--real') {
40 } elsif ($a eq '--check') {
47 die unless defined $real;
49 my $gcfpid = open2 \*GCFO, \*GCFI, 'git cat-file --batch' or die $!;
53 no warnings qw(recursion);
56 system @_ and die "@_ $! $?";
60 my $bare = `git rev-parse --is-bare-repository`;
65 foreach my $k (qw(core.sharedRepository)) {
66 $?=0; $!=0; my $v = `set -x; git config --local $k`;
67 if (defined $v && $?==0 && chomp $v) {
68 push @configs, [ $k, $v ];
69 } elsif (defined $v && $?==256 && $v eq '') {
71 die "git-config --local $k => $v $? $! ?";
76 my ($obj, $type) = @_;
77 print GCFI $obj, "\n" or die $!;
79 my ($gtype, $gsize) = $x =~ m/^\w+ (\w+) (\d+)\n/ or die "$obj ?";
80 $gtype eq $type or die "$obj $gtype != $type ?";
82 (read GCFO, $gdata, $gsize) == $gsize or die "$obj $!";
84 $x eq "\n" or die "$obj ($_) $!";
90 my ($data,$type) = @_;
91 my $gwopid = open2 \*GWO, \*GWI,
92 "git hash-object -w -t $type --stdin"
94 print GWI $data or die $!;
98 waitpid $gwopid,0 == $gwopid or die $!;
100 m/^(\w+)\n/ or die "$_ ?";
101 $count{"rewritten $type"}++;
107 sub rewrite_commit ($);
108 sub rewrite_commit ($) {
110 my $m = \ $memo{$obj};
111 return $$m if defined $$m;
112 my $olddata = getobj $obj, 'commit';
113 $olddata =~ m/(?<=\n)(?=\n)/ or die "$obj ?";
116 s{^(parent )(\w+)$}{ $1 . rewrite_commit($2) }gme;
117 $count{'fix overwrite'} += s{^commiter }{committer }gm;
118 if (!m{^author }m && !m{^committer }m) {
119 m{^parent (\w+)}m or die "$obj ?";
120 my $parent = getobj $1, 'commit';
121 $parent =~ m/^(?:.+\n)+(author .*\ncommitter .*\n)/;
122 m/\n$/ or die "$obj ?";
124 $count{'fix import'}++;
126 my $newdata = $_.$msg;
128 if ($newdata eq $olddata) {
131 #print STDERR "UNCHANGED $obj\n";
133 $newobj = hashobj $newdata, 'commit';
134 #print STDERR "REWRITTEN $obj $newobj\n";
142 sub filter_updates () {
143 @updates = grep { $_->[1] ne $_->[2] } @updates;
146 sub rewrite_tag ($) {
148 $_ = getobj $obj, 'tag';
149 m/^type (\w+)\n/m or die "$obj ?";
150 if ($1 ne 'commit') {
151 $count{"oddtags $1"}++;
154 m/^object (\w+)\n/m or die "$obj ?";
156 my $newref = rewrite_commit $oldref;
157 if ($oldref eq $newref) {
160 s/^(object )\w+$/ $1.$newref /me or die "$obj ($_) ?";
161 s/^-----BEGIN PGP SIGNATURE-----\n.*^-----END PGP SIGNATURE-----\n$//sm;
162 return hashobj $_, 'tag';
165 sub edit_rewrite_map ($) {
169 return $old unless @updates;
171 my $td = 'dgit-broken-fixup.tmp';
172 runcmd qw(rm -rf), $td;
173 mkdir $td, 0700 or die "$td $!";
175 runcmd qw(git init -q);
176 runcmd qw(git config gc.auto 0);
177 runcmd qw(rm -rf .git/objects);
178 symlink "../../objects", ".git/objects" or die $!;
179 foreach my $c (@configs) {
180 runcmd qw(git config), $c->[0], $c->[1];
186 runcmd qw(git checkout -q), $old;
187 open M, "map" or die $!;
189 m/^(\w+)(?:\s+(\w+))?$/ or die;
191 $count{rewrite_map_previous}++;
197 foreach my $oldc (keys %memo) {
198 my $newc = $memo{$oldc};
199 next if $oldc eq $newc;
202 foreach my $up (@updates) { # catches tags
203 $map{ $up->[1] } = $up->[2];
206 open M, ">", "map" or die $!;
208 $_, (defined $map{$_} ? " $map{$_}" : "")
214 runcmd qw(git add map);
217 runcmd qw(git commit -q), qw(-m), <<END, qw(map);
220 [dgit-badcommit-fixup $our_version]
224 my $new = `git rev-parse HEAD`;
228 chdir '..' or die $!;
229 runcmd qw(rm -rf), $td;
231 $count{rewrite_map_updated}++;
237 my $refs=`git for-each-ref`;
242 our $org_rewrite_map;
244 foreach my $rline (split /\n/, $refs) {
245 my ($obj, $type, $refname) =
246 $rline =~ m/^(\w+)\s+(\w+)\s+(\S.*)/
248 if ($refname eq 'refs/dgit-rewrite/map') {
249 $org_rewrite_map = $obj;
252 next if $refname =~ m{^refs/dgit-(?:badcommit|badfixuptest)/};
256 'exec >/dev/null git symbolic-ref -q "$1"', qw(x),
259 $count{symrefs_ignored}++;
262 die "$? $!" unless $?==256;
265 if ($type eq 'commit') {
266 $rewrite = rewrite_commit($obj);
267 } elsif ($type eq 'tag') {
268 $rewrite = rewrite_tag($obj);
270 warn "ref $refname refers to $type\n";
273 push @updates, [ $refname, $obj, $rewrite ];
276 if ($bare eq 'true') {
277 my $new_rewrite_map = edit_rewrite_map($org_rewrite_map);
278 push @updates, [ 'refs/dgit-rewrite/map',
279 ($org_rewrite_map // '0'x40),
280 ($new_rewrite_map // '0'x40),
287 print Dumper(\%count), "all is well - nothing to do\n";
291 #print Dumper(\@updates);
293 open U, "|git update-ref -m 'dgit bad commit fixup' --stdin" or die $!
296 for my $up (@updates) {
297 my ($ref, $old, $new, $nobackup) = @$up;
299 $otherref =~ s{^refs/}{};
301 print U <<END or die $! unless $nobackup;
302 create refs/dgit-badcommit/$otherref $old
304 print U <<END or die $!;
305 update $ref $new $old
308 print U <<END or die $!;
309 update refs/dgit-badfixuptest/$otherref $new
312 print "found trouble in history of $ref\n" or die $!;
318 close U or die "$? $!";
322 print Dumper(\%count);
325 print "old values saved in refs/dgit-badcommit/\n" or die $!;
326 } elsif ($real == 0) {
327 print "testing output saved in refs/dgit-badfixuptest/\n" or die $!;
329 print STDERR "found work to do, exiting status 2\n";