mirror of
https://github.com/git/git.git
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37f15d50c9
archimport was refusing to import commits that had merges from repositories that it didn't know about. Fixed. Also brings in nicer messages. Signed-off-by: Martin Langhoff <martin@catalyst.net.nz> Signed-off-by: Junio C Hamano <junkio@cox.net>
788 lines
23 KiB
Perl
Executable File
788 lines
23 KiB
Perl
Executable File
#!/usr/bin/perl -w
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#
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# This tool is copyright (c) 2005, Martin Langhoff.
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# It is released under the Gnu Public License, version 2.
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#
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# The basic idea is to walk the output of tla abrowse,
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# fetch the changesets and apply them.
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#
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=head1 Invocation
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git-archimport [ -h ] [ -v ] [ -T ] [ -t tempdir ] <archive>/<branch> [ <archive>/<branch> ]
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Imports a project from one or more Arch repositories. It will follow branches
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and repositories within the namespaces defined by the <archive/branch>
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parameters suppplied. If it cannot find the remote branch a merge comes from
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it will just import it as a regular commit. If it can find it, it will mark it
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as a merge whenever possible.
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See man (1) git-archimport for more details.
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=head1 TODO
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- create tag objects instead of ref tags
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- audit shell-escaping of filenames
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- hide our private tags somewhere smarter
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- find a way to make "cat *patches | patch" safe even when patchfiles are missing newlines
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=head1 Devel tricks
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Add print in front of the shell commands invoked via backticks.
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=cut
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use strict;
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use warnings;
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use Getopt::Std;
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use File::Spec;
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use File::Temp qw(tempfile tempdir);
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use File::Path qw(mkpath);
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use File::Basename qw(basename dirname);
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use String::ShellQuote;
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use Time::Local;
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use IO::Socket;
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use IO::Pipe;
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use POSIX qw(strftime dup2);
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use Data::Dumper qw/ Dumper /;
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use IPC::Open2;
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$SIG{'PIPE'}="IGNORE";
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$ENV{'TZ'}="UTC";
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my $git_dir = $ENV{"GIT_DIR"} || ".git";
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$ENV{"GIT_DIR"} = $git_dir;
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our($opt_h,$opt_v, $opt_T,
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$opt_C,$opt_t);
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sub usage() {
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print STDERR <<END;
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Usage: ${\basename $0} # fetch/update GIT from Arch
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[ -h ] [ -v ] [ -T ] [ -t tempdir ]
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repository/arch-branch [ repository/arch-branch] ...
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END
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exit(1);
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}
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getopts("Thvt:") or usage();
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usage if $opt_h;
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@ARGV >= 1 or usage();
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my @arch_roots = @ARGV;
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my ($tmpdir, $tmpdirname) = tempdir('git-archimport-XXXXXX', TMPDIR => 1, CLEANUP => 1);
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my $tmp = $opt_t || 1;
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$tmp = tempdir('git-archimport-XXXXXX', TMPDIR => 1, CLEANUP => 1);
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$opt_v && print "+ Using $tmp as temporary directory\n";
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my @psets = (); # the collection
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my %psets = (); # the collection, by name
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my %rptags = (); # my reverse private tags
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# to map a SHA1 to a commitid
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foreach my $root (@arch_roots) {
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my ($arepo, $abranch) = split(m!/!, $root);
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open ABROWSE, "tla abrowse -f -A $arepo --desc --merges $abranch |"
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or die "Problems with tla abrowse: $!";
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my %ps = (); # the current one
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my $mode = '';
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my $lastseen = '';
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while (<ABROWSE>) {
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chomp;
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# first record padded w 8 spaces
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if (s/^\s{8}\b//) {
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# store the record we just captured
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if (%ps) {
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my %temp = %ps; # break references
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push (@psets, \%temp);
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$psets{$temp{id}} = \%temp;
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%ps = ();
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}
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my ($id, $type) = split(m/\s{3}/, $_);
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$ps{id} = $id;
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$ps{repo} = $arepo;
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# deal with types
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if ($type =~ m/^\(simple changeset\)/) {
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$ps{type} = 's';
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} elsif ($type eq '(initial import)') {
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$ps{type} = 'i';
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} elsif ($type =~ m/^\(tag revision of (.+)\)/) {
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$ps{type} = 't';
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$ps{tag} = $1;
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} else {
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warn "Unknown type $type";
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}
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$lastseen = 'id';
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}
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if (s/^\s{10}//) {
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# 10 leading spaces or more
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# indicate commit metadata
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# date & author
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if ($lastseen eq 'id' && m/^\d{4}-\d{2}-\d{2}/) {
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my ($date, $authoremail) = split(m/\s{2,}/, $_);
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$ps{date} = $date;
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$ps{date} =~ s/\bGMT$//; # strip off trailign GMT
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if ($ps{date} =~ m/\b\w+$/) {
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warn 'Arch dates not in GMT?! - imported dates will be wrong';
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}
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$authoremail =~ m/^(.+)\s(\S+)$/;
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$ps{author} = $1;
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$ps{email} = $2;
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$lastseen = 'date';
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} elsif ($lastseen eq 'date') {
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# the only hint is position
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# subject is after date
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$ps{subj} = $_;
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$lastseen = 'subj';
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} elsif ($lastseen eq 'subj' && $_ eq 'merges in:') {
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$ps{merges} = [];
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$lastseen = 'merges';
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} elsif ($lastseen eq 'merges' && s/^\s{2}//) {
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push (@{$ps{merges}}, $_);
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} else {
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warn 'more metadata after merges!?';
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}
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}
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}
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if (%ps) {
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my %temp = %ps; # break references
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push (@psets, \%temp);
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$psets{ $temp{id} } = \%temp;
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%ps = ();
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}
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close ABROWSE;
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} # end foreach $root
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## Order patches by time
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@psets = sort {$a->{date}.$b->{id} cmp $b->{date}.$b->{id}} @psets;
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#print Dumper \@psets;
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##
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## TODO cleanup irrelevant patches
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## and put an initial import
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## or a full tag
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my $import = 0;
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unless (-d $git_dir) { # initial import
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if ($psets[0]{type} eq 'i' || $psets[0]{type} eq 't') {
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print "Starting import from $psets[0]{id}\n";
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`git-init-db`;
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die $! if $?;
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$import = 1;
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} else {
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die "Need to start from an import or a tag -- cannot use $psets[0]{id}";
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}
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} else { # progressing an import
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# load the rptags
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opendir(DIR, "$git_dir/archimport/tags")
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|| die "can't opendir: $!";
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while (my $file = readdir(DIR)) {
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# skip non-interesting-files
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next unless -f "$git_dir/archimport/tags/$file";
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next if $file =~ m/--base-0$/; # don't care for base-0
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my $sha = ptag($file);
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chomp $sha;
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# reconvert the 3rd '--' sequence from the end
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# into a slash
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# $file = reverse $file;
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# $file =~ s!^(.+?--.+?--.+?--.+?)--(.+)$!$1/$2!;
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# $file = reverse $file;
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$rptags{$sha} = $file;
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}
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closedir DIR;
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}
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# process patchsets
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foreach my $ps (@psets) {
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$ps->{branch} = branchname($ps->{id});
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#
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# ensure we have a clean state
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#
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if (`git diff-files`) {
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die "Unclean tree when about to process $ps->{id} " .
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" - did we fail to commit cleanly before?";
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}
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die $! if $?;
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#
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# skip commits already in repo
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#
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if (ptag($ps->{id})) {
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$opt_v && print " * Skipping already imported: $ps->{id}\n";
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next;
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}
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print " * Starting to work on $ps->{id}\n";
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#
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# create the branch if needed
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#
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if ($ps->{type} eq 'i' && !$import) {
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die "Should not have more than one 'Initial import' per GIT import: $ps->{id}";
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}
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unless ($import) { # skip for import
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if ( -e "$git_dir/refs/heads/$ps->{branch}") {
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# we know about this branch
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`git checkout $ps->{branch}`;
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} else {
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# new branch! we need to verify a few things
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die "Branch on a non-tag!" unless $ps->{type} eq 't';
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my $branchpoint = ptag($ps->{tag});
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die "Tagging from unknown id unsupported: $ps->{tag}"
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unless $branchpoint;
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# find where we are supposed to branch from
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`git checkout -b $ps->{branch} $branchpoint`;
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# If we trust Arch with the fact that this is just
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# a tag, and it does not affect the state of the tree
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# then we just tag and move on
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tag($ps->{id}, $branchpoint);
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ptag($ps->{id}, $branchpoint);
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print " * Tagged $ps->{id} at $branchpoint\n";
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next;
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}
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die $! if $?;
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}
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#
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# Apply the import/changeset/merge into the working tree
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#
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if ($ps->{type} eq 'i' || $ps->{type} eq 't') {
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apply_import($ps) or die $!;
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$import=0;
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} elsif ($ps->{type} eq 's') {
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apply_cset($ps);
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}
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#
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# prepare update git's index, based on what arch knows
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# about the pset, resolve parents, etc
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#
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my $tree;
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my $commitlog = `tla cat-archive-log -A $ps->{repo} $ps->{id}`;
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die "Error in cat-archive-log: $!" if $?;
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# parselog will git-add/rm files
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# and generally prepare things for the commit
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# NOTE: parselog will shell-quote filenames!
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my ($sum, $msg, $add, $del, $mod, $ren) = parselog($commitlog);
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my $logmessage = "$sum\n$msg";
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# imports don't give us good info
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# on added files. Shame on them
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if ($ps->{type} eq 'i' || $ps->{type} eq 't') {
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`find . -type f -print0 | grep -zv '^./$git_dir' | xargs -0 -l100 git-update-index --add`;
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`git-ls-files --deleted -z | xargs --no-run-if-empty -0 -l100 git-update-index --remove`;
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}
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if (@$add) {
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while (@$add) {
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my @slice = splice(@$add, 0, 100);
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my $slice = join(' ', @slice);
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`git-update-index --add $slice`;
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die "Error in git-update-index --add: $!" if $?;
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}
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}
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if (@$del) {
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foreach my $file (@$del) {
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unlink $file or die "Problems deleting $file : $!";
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}
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while (@$del) {
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my @slice = splice(@$del, 0, 100);
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my $slice = join(' ', @slice);
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`git-update-index --remove $slice`;
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die "Error in git-update-index --remove: $!" if $?;
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}
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}
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if (@$ren) { # renamed
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if (@$ren % 2) {
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die "Odd number of entries in rename!?";
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}
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;
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while (@$ren) {
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my $from = pop @$ren;
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my $to = pop @$ren;
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unless (-d dirname($to)) {
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mkpath(dirname($to)); # will die on err
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}
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#print "moving $from $to";
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`mv $from $to`;
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die "Error renaming $from $to : $!" if $?;
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`git-update-index --remove $from`;
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die "Error in git-update-index --remove: $!" if $?;
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`git-update-index --add $to`;
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die "Error in git-update-index --add: $!" if $?;
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}
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}
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if (@$mod) { # must be _after_ renames
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while (@$mod) {
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my @slice = splice(@$mod, 0, 100);
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my $slice = join(' ', @slice);
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`git-update-index $slice`;
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die "Error in git-update-index: $!" if $?;
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}
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}
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# warn "errors when running git-update-index! $!";
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$tree = `git-write-tree`;
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die "cannot write tree $!" if $?;
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chomp $tree;
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#
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# Who's your daddy?
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#
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my @par;
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if ( -e "$git_dir/refs/heads/$ps->{branch}") {
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if (open HEAD, "<$git_dir/refs/heads/$ps->{branch}") {
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my $p = <HEAD>;
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close HEAD;
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chomp $p;
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push @par, '-p', $p;
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} else {
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if ($ps->{type} eq 's') {
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warn "Could not find the right head for the branch $ps->{branch}";
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}
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}
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}
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if ($ps->{merges}) {
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push @par, find_parents($ps);
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}
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my $par = join (' ', @par);
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#
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# Commit, tag and clean state
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#
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$ENV{TZ} = 'GMT';
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$ENV{GIT_AUTHOR_NAME} = $ps->{author};
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$ENV{GIT_AUTHOR_EMAIL} = $ps->{email};
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$ENV{GIT_AUTHOR_DATE} = $ps->{date};
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$ENV{GIT_COMMITTER_NAME} = $ps->{author};
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$ENV{GIT_COMMITTER_EMAIL} = $ps->{email};
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$ENV{GIT_COMMITTER_DATE} = $ps->{date};
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my ($pid, $commit_rh, $commit_wh);
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$commit_rh = 'commit_rh';
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$commit_wh = 'commit_wh';
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$pid = open2(*READER, *WRITER, "git-commit-tree $tree $par")
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or die $!;
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print WRITER $logmessage; # write
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close WRITER;
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my $commitid = <READER>; # read
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chomp $commitid;
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close READER;
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waitpid $pid,0; # close;
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if (length $commitid != 40) {
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die "Something went wrong with the commit! $! $commitid";
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}
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#
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# Update the branch
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#
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open HEAD, ">$git_dir/refs/heads/$ps->{branch}";
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print HEAD $commitid;
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close HEAD;
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unlink ("$git_dir/HEAD");
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symlink("refs/heads/$ps->{branch}","$git_dir/HEAD");
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# tag accordingly
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ptag($ps->{id}, $commitid); # private tag
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if ($opt_T || $ps->{type} eq 't' || $ps->{type} eq 'i') {
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tag($ps->{id}, $commitid);
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}
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print " * Committed $ps->{id}\n";
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print " + tree $tree\n";
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print " + commit $commitid\n";
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$opt_v && print " + commit date is $ps->{date} \n";
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$opt_v && print " + parents: $par \n";
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}
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sub branchname {
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my $id = shift;
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$id =~ s#^.+?/##;
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my @parts = split(m/--/, $id);
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return join('--', @parts[0..1]);
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}
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sub apply_import {
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my $ps = shift;
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my $bname = branchname($ps->{id});
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`mkdir -p $tmp`;
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`tla get -s --no-pristine -A $ps->{repo} $ps->{id} $tmp/import`;
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die "Cannot get import: $!" if $?;
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`rsync -v --archive --delete --exclude '$git_dir' --exclude '.arch-ids' --exclude '{arch}' $tmp/import/* ./`;
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die "Cannot rsync import:$!" if $?;
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`rm -fr $tmp/import`;
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die "Cannot remove tempdir: $!" if $?;
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return 1;
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}
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sub apply_cset {
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my $ps = shift;
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`mkdir -p $tmp`;
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# get the changeset
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`tla get-changeset -A $ps->{repo} $ps->{id} $tmp/changeset`;
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die "Cannot get changeset: $!" if $?;
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# apply patches
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if (`find $tmp/changeset/patches -type f -name '*.patch'`) {
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# this can be sped up considerably by doing
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# (find | xargs cat) | patch
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# but that cna get mucked up by patches
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# with missing trailing newlines or the standard
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# 'missing newline' flag in the patch - possibly
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# produced with an old/buggy diff.
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# slow and safe, we invoke patch once per patchfile
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`find $tmp/changeset/patches -type f -name '*.patch' -print0 | grep -zv '{arch}' | xargs -iFILE -0 --no-run-if-empty patch -p1 --forward -iFILE`;
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die "Problem applying patches! $!" if $?;
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}
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# apply changed binary files
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if (my @modified = `find $tmp/changeset/patches -type f -name '*.modified'`) {
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foreach my $mod (@modified) {
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chomp $mod;
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my $orig = $mod;
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$orig =~ s/\.modified$//; # lazy
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$orig =~ s!^\Q$tmp\E/changeset/patches/!!;
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#print "rsync -p '$mod' '$orig'";
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`rsync -p $mod ./$orig`;
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die "Problem applying binary changes! $!" if $?;
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}
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}
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# bring in new files
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`rsync --archive --exclude '$git_dir' --exclude '.arch-ids' --exclude '{arch}' $tmp/changeset/new-files-archive/* ./`;
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# deleted files are hinted from the commitlog processing
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`rm -fr $tmp/changeset`;
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}
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# =for reference
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# A log entry looks like
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# Revision: moodle-org--moodle--1.3.3--patch-15
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# Archive: arch-eduforge@catalyst.net.nz--2004
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# Creator: Penny Leach <penny@catalyst.net.nz>
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# Date: Wed May 25 14:15:34 NZST 2005
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# Standard-date: 2005-05-25 02:15:34 GMT
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# New-files: lang/de/.arch-ids/block_glossary_random.php.id
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# lang/de/.arch-ids/block_html.php.id
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# New-directories: lang/de/help/questionnaire
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# lang/de/help/questionnaire/.arch-ids
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# Renamed-files: .arch-ids/db_sears.sql.id db/.arch-ids/db_sears.sql.id
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# db_sears.sql db/db_sears.sql
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# Removed-files: lang/be/docs/.arch-ids/release.html.id
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# lang/be/docs/.arch-ids/releaseold.html.id
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# Modified-files: admin/cron.php admin/delete.php
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# admin/editor.html backup/lib.php backup/restore.php
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# New-patches: arch-eduforge@catalyst.net.nz--2004/moodle-org--moodle--1.3.3--patch-15
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# Summary: Updating to latest from MOODLE_14_STABLE (1.4.5+)
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# Keywords:
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#
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# Updating yadda tadda tadda madda
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sub parselog {
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my $log = shift;
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#print $log;
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my (@add, @del, @mod, @ren, @kw, $sum, $msg );
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if ($log =~ m/(?:\n|^)New-files:(.*?)(?=\n\w)/s ) {
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my $files = $1;
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@add = split(m/\s+/s, $files);
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}
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if ($log =~ m/(?:\n|^)Removed-files:(.*?)(?=\n\w)/s ) {
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my $files = $1;
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@del = split(m/\s+/s, $files);
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}
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if ($log =~ m/(?:\n|^)Modified-files:(.*?)(?=\n\w)/s ) {
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my $files = $1;
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@mod = split(m/\s+/s, $files);
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}
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if ($log =~ m/(?:\n|^)Renamed-files:(.*?)(?=\n\w)/s ) {
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my $files = $1;
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@ren = split(m/\s+/s, $files);
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}
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$sum ='';
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if ($log =~ m/^Summary:(.+?)$/m ) {
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$sum = $1;
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$sum =~ s/^\s+//;
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$sum =~ s/\s+$//;
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}
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$msg = '';
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if ($log =~ m/\n\n(.+)$/s) {
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$msg = $1;
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$msg =~ s/^\s+//;
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$msg =~ s/\s+$//;
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}
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# cleanup the arrays
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foreach my $ref ( (\@add, \@del, \@mod, \@ren) ) {
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my @tmp = ();
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while (my $t = pop @$ref) {
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next unless length ($t);
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next if $t =~ m!\{arch\}/!;
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next if $t =~ m!\.arch-ids/!;
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next if $t =~ m!\.arch-inventory$!;
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push (@tmp, shell_quote($t));
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}
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@$ref = @tmp;
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}
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#print Dumper [$sum, $msg, \@add, \@del, \@mod, \@ren];
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return ($sum, $msg, \@add, \@del, \@mod, \@ren);
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}
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# write/read a tag
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sub tag {
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my ($tag, $commit) = @_;
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$tag =~ s|/|--|g;
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$tag = shell_quote($tag);
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if ($commit) {
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open(C,">$git_dir/refs/tags/$tag")
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or die "Cannot create tag $tag: $!\n";
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print C "$commit\n"
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or die "Cannot write tag $tag: $!\n";
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close(C)
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or die "Cannot write tag $tag: $!\n";
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print " * Created tag ' $tag' on '$commit'\n" if $opt_v;
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} else { # read
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open(C,"<$git_dir/refs/tags/$tag")
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or die "Cannot read tag $tag: $!\n";
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$commit = <C>;
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chomp $commit;
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die "Error reading tag $tag: $!\n" unless length $commit == 40;
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close(C)
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or die "Cannot read tag $tag: $!\n";
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return $commit;
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}
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}
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# write/read a private tag
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# reads fail softly if the tag isn't there
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sub ptag {
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my ($tag, $commit) = @_;
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$tag =~ s|/|--|g;
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$tag = shell_quote($tag);
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unless (-d "$git_dir/archimport/tags") {
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mkpath("$git_dir/archimport/tags");
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}
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if ($commit) { # write
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open(C,">$git_dir/archimport/tags/$tag")
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or die "Cannot create tag $tag: $!\n";
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print C "$commit\n"
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or die "Cannot write tag $tag: $!\n";
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close(C)
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or die "Cannot write tag $tag: $!\n";
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$rptags{$commit} = $tag
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unless $tag =~ m/--base-0$/;
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} else { # read
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# if the tag isn't there, return 0
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unless ( -s "$git_dir/archimport/tags/$tag") {
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return 0;
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}
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open(C,"<$git_dir/archimport/tags/$tag")
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or die "Cannot read tag $tag: $!\n";
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$commit = <C>;
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chomp $commit;
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die "Error reading tag $tag: $!\n" unless length $commit == 40;
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close(C)
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or die "Cannot read tag $tag: $!\n";
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unless (defined $rptags{$commit}) {
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$rptags{$commit} = $tag;
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}
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return $commit;
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}
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}
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sub find_parents {
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#
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# Identify what branches are merging into me
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# and whether we are fully merged
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# git-merge-base <headsha> <headsha> should tell
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# me what the base of the merge should be
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#
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my $ps = shift;
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my %branches; # holds an arrayref per branch
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# the arrayref contains a list of
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# merged patches between the base
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# of the merge and the current head
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my @parents; # parents found for this commit
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# simple loop to split the merges
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# per branch
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foreach my $merge (@{$ps->{merges}}) {
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my $branch = branchname($merge);
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unless (defined $branches{$branch} ){
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$branches{$branch} = [];
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}
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push @{$branches{$branch}}, $merge;
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}
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#
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# foreach branch find a merge base and walk it to the
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# head where we are, collecting the merged patchsets that
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# Arch has recorded. Keep that in @have
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# Compare that with the commits on the other branch
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# between merge-base and the tip of the branch (@need)
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# and see if we have a series of consecutive patches
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# starting from the merge base. The tip of the series
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# of consecutive patches merged is our new parent for
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# that branch.
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#
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foreach my $branch (keys %branches) {
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# check that we actually know about the branch
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next unless -e "$git_dir/refs/heads/$branch";
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my $mergebase = `git-merge-base $branch $ps->{branch}`;
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die "Cannot find merge base for $branch and $ps->{branch}" if $?;
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chomp $mergebase;
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# now walk up to the mergepoint collecting what patches we have
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my $branchtip = git_rev_parse($ps->{branch});
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my @ancestors = `git-rev-list --merge-order $branchtip ^$mergebase`;
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my %have; # collected merges this branch has
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foreach my $merge (@{$ps->{merges}}) {
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$have{$merge} = 1;
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}
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my %ancestorshave;
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foreach my $par (@ancestors) {
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$par = commitid2pset($par);
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if (defined $par->{merges}) {
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foreach my $merge (@{$par->{merges}}) {
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$ancestorshave{$merge}=1;
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}
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}
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}
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# print "++++ Merges in $ps->{id} are....\n";
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# my @have = sort keys %have; print Dumper(\@have);
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# merge what we have with what ancestors have
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%have = (%have, %ancestorshave);
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# see what the remote branch has - these are the merges we
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# will want to have in a consecutive series from the mergebase
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my $otherbranchtip = git_rev_parse($branch);
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my @needraw = `git-rev-list --merge-order $otherbranchtip ^$mergebase`;
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my @need;
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foreach my $needps (@needraw) { # get the psets
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$needps = commitid2pset($needps);
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# git-rev-list will also
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# list commits merged in via earlier
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# merges. we are only interested in commits
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# from the branch we're looking at
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if ($branch eq $needps->{branch}) {
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push @need, $needps->{id};
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}
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}
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# print "++++ Merges from $branch we want are....\n";
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# print Dumper(\@need);
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my $newparent;
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while (my $needed_commit = pop @need) {
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if ($have{$needed_commit}) {
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$newparent = $needed_commit;
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} else {
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last; # break out of the while
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}
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}
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if ($newparent) {
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push @parents, $newparent;
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}
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} # end foreach branch
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# prune redundant parents
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my %parents;
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foreach my $p (@parents) {
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$parents{$p} = 1;
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}
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foreach my $p (@parents) {
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next unless exists $psets{$p}{merges};
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next unless ref $psets{$p}{merges};
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my @merges = @{$psets{$p}{merges}};
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foreach my $merge (@merges) {
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if ($parents{$merge}) {
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delete $parents{$merge};
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}
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}
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}
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@parents = keys %parents;
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@parents = map { " -p " . ptag($_) } @parents;
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return @parents;
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}
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sub git_rev_parse {
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my $name = shift;
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my $val = `git-rev-parse $name`;
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die "Error: git-rev-parse $name" if $?;
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chomp $val;
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return $val;
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}
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# resolve a SHA1 to a known patchset
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sub commitid2pset {
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my $commitid = shift;
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chomp $commitid;
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my $name = $rptags{$commitid}
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|| die "Cannot find reverse tag mapping for $commitid";
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# the keys in %rptag are slightly munged; unmunge
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# reconvert the 3rd '--' sequence from the end
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# into a slash
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$name = reverse $name;
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$name =~ s!^(.+?--.+?--.+?--.+?)--(.+)$!$1/$2!;
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$name = reverse $name;
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my $ps = $psets{$name}
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|| (print Dumper(sort keys %psets)) && die "Cannot find patchset for $name";
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return $ps;
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}
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