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git/git-archimport.perl

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