mirror of
https://github.com/git/git.git
synced 2024-05-06 00:36:14 +02:00
f84f9d38eb
Arch uses pika escaping in some places (but not all!). Specifically, commits of the type 'patch' use pika escaping in the log entries, which we parse to know what to add/delete and what to commit. This patch checks for hints of pika escaping and asks tla to unescape for us. Originally implemented by Penny Leach <penny@catalyst.net.nz> Signed-off-by: Martin Langhoff <martin@catalyst.net.nz> Signed-off-by: Junio C Hamano <junkio@cox.net>
793 lines
23 KiB
Perl
Executable File
793 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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# tla cat-archive-log will give us filenames with spaces as file\(sp)name - why?
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# we can assume that any filename with \ indicates some pika escaping that we want to get rid of.
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if ($t =~ /\\/ ){
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$t = `tla escape --unescaped '$t'`;
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}
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push (@tmp, shell_quote($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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