SUITES wip, found, experiments for distro suite name syntax

[dgit-junk.git] / badcommit-fixup

diff --git a/badcommit-fixup b/badcommit-fixup
index af4b89d2bbb30a39e6d78a93adcd849e9bbf1a72..4573121076bac4ee3b094d9a0b04b9d7fa3e2605 100755 (executable)
--- a/badcommit-fixup
+++ b/badcommit-fixup
@@ -1,17 +1,44 @@
 #!/usr/bin/perl -w
 
+# usage:
+#   .../badcommit-fixup --test
+#   .../badcommit-fixup --real
+
 use strict;
 
 use POSIX;
 use IPC::Open2;
 use Data::Dumper;
 
+my $real;
+
+foreach my $a (@ARGV) {
+    if ($a eq '--test') {
+       $real = 0;
+    } elsif ($a eq '--real') {
+       $real = 1;
+    } else {
+       die "$a ?";
+    }
+}
+
+die unless defined $real;
+
 my $gcfpid = open2 \*GCFO, \*GCFI, 'git cat-file --batch' or die $!;
 
 our %count;
 
 no warnings qw(recursion);
 
+sub runcmd {
+    system @_ and die "@_ $! $?";
+}
+
+$!=0; $?=0;
+my $bare = `git rev-parse --is-bare-repository`;
+die "$? $!" if $?;
+chomp $bare or die;
+
 sub getobj ($$) {
     my ($obj, $type) = @_;
     print GCFI $obj, "\n" or die $!;
@@ -20,7 +47,6 @@ sub getobj ($$) {
     $gtype eq $type or die "$obj $gtype != $type ?";
     my $gdata;
     (read GCFO, $gdata, $gsize) == $gsize or die "$obj $!";
-#print STDERR ">$obj|$x|$gdata|$gsize<\n";
     $x = <GCFO>;
     $x eq "\n" or die "$obj ($_) $!";
     $count{inspected}++;
@@ -30,7 +56,7 @@ sub getobj ($$) {
 sub hashobj ($$) {
     my ($data,$type) = @_;
     my $gwopid = open2 \*GWO, \*GWI,
-       "git hash-object -t $type --stdin"
+       "git hash-object -w -t $type --stdin"
        or die $!;
     print GWI $data or die $!;
     close GWI or die $!;
@@ -53,16 +79,16 @@ sub rewrite_commit ($) {
     my $olddata = getobj $obj, 'commit';
     $olddata =~ m/(?<=\n)(?=\n)/ or die "$obj ?";
     my $msg = $';
-    $_ = $`;
+    local $_ = $`;
     s{^(parent )(\w+)$}{ $1 . rewrite_commit($2) }gme;
-    $count{fix_overwrite} += s{^commiter }{committer }gm;
+    $count{'fix overwrite'} += s{^commiter }{committer }gm;
     if (!m{^author }m && !m{^committer }m) {
        m{^parent (\w+)}m or die "$obj ?";
        my $parent = getobj $1, 'commit';
        $parent =~ m/^(?:.+\n)+(author .*\ncommitter .*\n)/;
        m/\n$/ or die "$obj ?";
        $_ .= $1;
-       $count{fix_import}++;
+       $count{'fix import'}++;
     }
     my $newdata = $_.$msg;
     my $newobj;
@@ -76,13 +102,79 @@ sub rewrite_commit ($) {
     return $newobj;
 }
 
+sub rewrite_commit_adddummy ($$$) {
+    my ($ref, $veryold, $old) = @_;
+
+    die "$bare ?" unless $bare eq 'true';
+
+    my $td = 'dgit-broken-fixup.tmp';
+    runcmd qw(rm -rf), $td;
+    mkdir $td, 0700 or die "$td $!";
+    chdir $td or die $!;
+    runcmd qw(git init -q);
+    runcmd qw(git config gc.auto 0);
+    runcmd qw(rm -rf .git/objects);
+    symlink "../../objects", ".git/objects" or die $!;
+    runcmd qw(git checkout -q), $old;
+
+    open C, "debian/changelog" or die $!;
+    my $clog = do {
+       local $/ = undef;
+       <C>;
+    };
+    C->error and die $!;
+    close C or die $!;
+    defined $clog or die $!;
+
+    $!=0; $?=0;
+    my $v = `dpkg-parsechangelog`;
+    die "$ref $veryold $old $? $!" if $?;
+    $v =~ m/^Source: (\S+)$/m or die "$ref $veryold $old ?";
+    my $pkg = $1;
+    $v =~ m/^Version: (\S+)$/m or die "$ref $veryold $old ?";
+    my $vsn = $1;
+    $vsn .= "+~dgitfix";
+
+    open C, ">", "debian/changelog" or die $!;
+    print C <<END;
+$pkg ($vsn) UNRELEASED; urgency=low
+
+  * Additional commit, with slightly incremented version number,
+    to override bad commits generated by dgit due to #849041.
+  * No changes to the package.
+  * Not uploaded anywhere.
+
+ -- Ian Jackson <ijackson\@chiark.greenend.org.uk>  Thu, 05 Jan 2017 17:58:21 +0000
+
+END
+    print C $clog or die $!;
+    close C or die $!;
+
+    runcmd qw(git commit -q), 
+       '--author=Ian Jackson <ijackson@chiark.greenend.org.uk>',
+       qw(-m), 'Dummy changelog entry to work around #849041 fallout',
+       qw(debian/changelog);
+
+    $!=0; $?=0;
+    my $new = `git rev-parse HEAD`;
+    die "$? $!" if $?;
+    chomp $new or die;
+
+    chdir '..' or die $!;
+    runcmd qw(rm -rf), $td;
+
+    $count{dummyadded}++;
+
+    return $new;
+}
+
 sub rewrite_tag ($) {
     my ($obj) = @_;
     $_ = getobj $obj, 'tag';
     m/^type (\w+)\n/m or die "$obj ?";
     if ($1 ne 'commit') {
        $count{"oddtags $1"}++;
-       return;
+       return $obj;
     }
     m/^object (\w+)\n/m or die "$obj ?";
     my $oldref = $1;
@@ -96,7 +188,7 @@ sub rewrite_tag ($) {
 }
 
 $!=0; $?=0;
-my $refs=`git-for-each-ref`;
+my $refs=`git for-each-ref`;
 die "$? $!" if $?;
 
 chomp $refs;
@@ -110,14 +202,55 @@ foreach my $rline (split /\n/, $refs) {
     my $rewrite;
     if ($type eq 'commit') {
        $rewrite = rewrite_commit($obj);
+       if ($refname =~ m{^refs/dgit/[^/]+$} &&
+          $rewrite ne $obj) {
+           $rewrite = rewrite_commit_adddummy $refname, $obj, $rewrite;
+       }
     } elsif ($type eq 'tag') {
-       my $rewrite = rewrite_tag($obj);
+       $rewrite = rewrite_tag($obj);
     } else {
        warn "ref $refname refers to $type\n";
        next;
     }
-    next if $rewrite = $obj;
-    push @updates, [ $refname, $rewrite ];
+    next if $rewrite eq $obj;
+    push @updates, [ $refname, $obj, $rewrite ];
+}
+
+our $worktree;
+
+#print Dumper(\@updates);
+
+open U, "|git update-ref -m 'dgit bad commit fixup' --stdin" or die $!;
+
+if ($real && $bare eq 'false') {
+    print "detaching your HEAD\n" or die $!;
+    runcmd 'git checkout --detach';
+}
+
+for my $up (@updates) {
+    my ($ref, $old, $new) = @$up;
+    my $otherref = $ref;
+    $otherref =~ s{^refs/}{};
+    if ($real) {
+       print U <<END or die $!;
+create refs/dgit-badcommit/$otherref $old
+update $ref $new $old
+END
+    } else {
+       print U <<END or die $!;
+update refs/dgit-badfixuptest/$otherref $new
+END
+    }
 }
 
-print Dumper(\@updates, \%count);
+$?=0; $!=0;
+close U or die "$? $!";
+die $? if $?;
+
+print Dumper(\%count);
+
+if ($real) {
+    print "old values saved in refs/dgit-badcommit/\n" or die $!;
+} else {
+    print "testing output saved in refs/dgit-badfixuptest/\n" or die $!;
+}