# The basic idea is to walk the output of tla abrowse,
# fetch the changesets and apply them.
#
+
=head1 Invocation
- git-archimport -i <archive>/<branch> [<archive>/<branch>]
- [ <archive>/<branch> ]
+ git-archimport [ -h ] [ -v ] [ -T ] [ -t tempdir ] <archive>/<branch> [ <archive>/<branch> ]
- The script expects you to provide the key roots where it can start the
- import from an 'initial import' or 'tag' type of Arch commit. It will
- then follow all the branching and tagging within the provided roots.
+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.
- It will die if it sees branches that have different roots.
+See man (1) git-archimport for more details.
-=head2 TODO
+=head1 TODO
- - keep track of merged patches, and mark a git merge when it happens
- - smarter rules to parse the archive history "up" and "down"
- - be able to continue an import where we left off
+ - 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.
+=head1 Devel Notes
+
+There are several places where Arch and git terminology are intermixed
+and potentially confused.
+
+The notion of a "branch" in git is approximately equivalent to
+a "archive/category--branch--version" in Arch. Also, it should be noted
+that the "--branch" portion of "archive/category--branch--version" is really
+optional in Arch although not many people (nor tools!) seem to know this.
+This means that "archive/category--version" is also a valid "branch"
+in git terms.
+
+We always refer to Arch names by their fully qualified variant (which
+means the "archive" name is prefixed.
+
+For people unfamiliar with Arch, an "archive" is the term for "repository",
+and can contain multiple, unrelated branches.
+
=cut
use strict;
use warnings;
use Getopt::Std;
use File::Spec;
-use File::Temp qw(tempfile);
+use File::Temp qw(tempfile tempdir);
use File::Path qw(mkpath);
use File::Basename qw(basename dirname);
use String::ShellQuote;
$SIG{'PIPE'}="IGNORE";
$ENV{'TZ'}="UTC";
-our($opt_h,$opt_v, $opt_T,
- $opt_C,$opt_t);
+my $git_dir = $ENV{"GIT_DIR"} || ".git";
+$ENV{"GIT_DIR"} = $git_dir;
+my $ptag_dir = "$git_dir/archimport/tags";
+
+our($opt_h,$opt_v, $opt_T,$opt_t,$opt_o);
sub usage() {
print STDERR <<END;
Usage: ${\basename $0} # fetch/update GIT from Arch
- [ -h ] [ -v ] [ -T ]
- [ -C GIT_repository ] [ -t tempdir ]
+ [ -o ] [ -h ] [ -v ] [ -T ] [ -t tempdir ]
repository/arch-branch [ repository/arch-branch] ...
END
exit(1);
}
-getopts("ThviC:t:") or usage();
+getopts("Thvt:") or usage();
usage if $opt_h;
@ARGV >= 1 or usage();
my @arch_roots = @ARGV;
-my $tmp = $opt_t;
-$tmp ||= '/tmp';
-$tmp .= '/git-archimport/';
-
-my $git_tree = $opt_C;
-$git_tree ||= ".";
-
+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
## and put an initial import
## or a full tag
my $import = 0;
-unless (-d '.git') { # initial import
+unless (-d $git_dir) { # initial import
if ($psets[0]{type} eq 'i' || $psets[0]{type} eq 't') {
print "Starting import from $psets[0]{id}\n";
`git-init-db`;
}
} else { # progressing an import
# load the rptags
- opendir(DIR, ".git/archimport/tags")
+ opendir(DIR, "$git_dir/archimport/tags")
|| die "can't opendir: $!";
while (my $file = readdir(DIR)) {
- # skip non-interesting-files
- next unless -f ".git/archimport/tags/$file";
- next if $file =~ m/--base-0$/; # don't care for base-0
+ # skip non-interesting-files
+ next unless -f "$ptag_dir/$file";
+
+ # convert first '--' to '/' from old git-archimport to use
+ # as an archivename/c--b--v private tag
+ if ($file !~ m!,!) {
+ my $oldfile = $file;
+ $file =~ s!--!,!;
+ print STDERR "converting old tag $oldfile to $file\n";
+ rename("$ptag_dir/$oldfile", "$ptag_dir/$file") or die $!;
+ }
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) {
+# extract the Arch repository name (Arch "archive" in Arch-speak)
+sub extract_reponame {
+ my $fq_cvbr = shift; # archivename/[[[[category]branch]version]revision]
+ return (split(/\//, $fq_cvbr))[0];
+}
+
+sub extract_versionname {
+ my $name = shift;
+ $name =~ s/--(?:patch|version(?:fix)?|base)-\d+$//;
+ return $name;
+}
- $ps->{branch} = branchname($ps->{id});
+# convert a fully-qualified revision or version to a unique dirname:
+# normalperson@yhbt.net-05/mpd--uclinux--1--patch-2
+# becomes: normalperson@yhbt.net-05,mpd--uclinux--1
+#
+# the git notion of a branch is closer to
+# archive/category--branch--version than archive/category--branch, so we
+# use this to convert to git branch names.
+# Also, keep archive names but replace '/' with ',' since it won't require
+# subdirectories, and is safer than swapping '--' which could confuse
+# reverse-mapping when dealing with bastard branches that
+# are just archive/category--version (no --branch)
+sub tree_dirname {
+ my $revision = shift;
+ my $name = extract_versionname($revision);
+ $name =~ s#/#,#;
+ return $name;
+}
+
+# old versions of git-archimport just use the <category--branch> part:
+sub old_style_branchname {
+ my $id = shift;
+ my $ret = safe_pipe_capture($TLA,'parse-package-name','-p',$id);
+ chomp $ret;
+ return $ret;
+}
+
+*git_branchname = $opt_o ? *old_style_branchname : *tree_dirname;
+
+# process patchsets
+foreach my $ps (@psets) {
+ $ps->{branch} = git_branchname($ps->{id});
#
# ensure we have a clean state
# skip commits already in repo
#
if (ptag($ps->{id})) {
- $opt_v && print "Skipping already imported: $ps->{id}\n";
+ $opt_v && print " * Skipping already imported: $ps->{id}\n";
next;
}
+ print " * Starting to work on $ps->{id}\n";
+
#
# create the branch if needed
#
}
unless ($import) { # skip for import
- if ( -e ".git/refs/heads/$ps->{branch}") {
+ if ( -e "$git_dir/refs/heads/$ps->{branch}") {
# we know about this branch
`git checkout $ps->{branch}`;
} else {
# imports don't give us good info
# on added files. Shame on them
if ($ps->{type} eq 'i' || $ps->{type} eq 't') {
- `find . -type f -print0 | grep -zv '^./.git' | xargs -0 -l100 git-update-index --add`;
+ `find . -type f -print0 | grep -zv '^./$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`;
}
# Who's your daddy?
#
my @par;
- if ( -e ".git/refs/heads/$ps->{branch}") {
- if (open HEAD, "<.git/refs/heads/$ps->{branch}") {
+ if ( -e "$git_dir/refs/heads/$ps->{branch}") {
+ if (open HEAD, "<$git_dir/refs/heads/$ps->{branch}") {
my $p = <HEAD>;
close HEAD;
chomp $p;
#
# Update the branch
#
- open HEAD, ">.git/refs/heads/$ps->{branch}";
+ open HEAD, ">$git_dir/refs/heads/$ps->{branch}";
print HEAD $commitid;
close HEAD;
- unlink ('.git/HEAD');
- symlink("refs/heads/$ps->{branch}",".git/HEAD");
+ system('git-update-ref', 'HEAD', "$ps->{branch}");
# tag accordingly
ptag($ps->{id}, $commitid); # private tag
$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});
+ my $bname = git_branchname($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' --exclude '.arch-ids' --exclude '{arch}' $tmp/import/* ./`;
+ `rsync -v --archive --delete --exclude '$git_dir' --exclude '.arch-ids' --exclude '{arch}' $tmp/import/* ./`;
die "Cannot rsync import:$!" if $?;
`rm -fr $tmp/import`;
}
# bring in new files
- `rsync --archive --exclude '.git' --exclude '.arch-ids' --exclude '{arch}' $tmp/changeset/new-files-archive/* ./`;
+ `rsync --archive --exclude '$git_dir' --exclude '.arch-ids' --exclude '{arch}' $tmp/changeset/new-files-archive/* ./`;
# deleted files are hinted from the commitlog processing
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;
# write/read a tag
sub tag {
my ($tag, $commit) = @_;
- $tag =~ s|/|--|g;
- $tag = shell_quote($tag);
+
+ if ($opt_o) {
+ $tag =~ s|/|--|g;
+ } else {
+ # don't use subdirs for tags yet, it could screw up other porcelains
+ $tag =~ s|/|,|g;
+ }
if ($commit) {
- open(C,">.git/refs/tags/$tag")
+ open(C,">","$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 $opt_v;
+ print " * Created tag '$tag' on '$commit'\n" if $opt_v;
} else { # read
- open(C,"<.git/refs/tags/$tag")
+ open(C,"<","$git_dir/refs/tags/$tag")
or die "Cannot read tag $tag: $!\n";
$commit = <C>;
chomp $commit;
# reads fail softly if the tag isn't there
sub ptag {
my ($tag, $commit) = @_;
- $tag =~ s|/|--|g;
- $tag = shell_quote($tag);
+
+ # don't use subdirs for tags yet, it could screw up other porcelains
+ $tag =~ s|/|,|g;
- unless (-d '.git/archimport/tags') {
- mkpath('.git/archimport/tags');
- }
+ my $tag_file = "$ptag_dir/$tag";
+ my $tag_branch_dir = dirname($tag_file);
+ mkpath($tag_branch_dir) unless (-d $tag_branch_dir);
if ($commit) { # write
- open(C,">.git/archimport/tags/$tag")
+ open(C,">",$tag_file)
or die "Cannot create tag $tag: $!\n";
print C "$commit\n"
or die "Cannot write tag $tag: $!\n";
unless $tag =~ m/--base-0$/;
} else { # read
# if the tag isn't there, return 0
- unless ( -s ".git/archimport/tags/$tag") {
+ unless ( -s $tag_file) {
return 0;
}
- open(C,"<.git/archimport/tags/$tag")
+ open(C,"<",$tag_file)
or die "Cannot read tag $tag: $!\n";
$commit = <C>;
chomp $commit;
# simple loop to split the merges
# per branch
foreach my $merge (@{$ps->{merges}}) {
- my $branch = branchname($merge);
+ my $branch = git_branchname($merge);
unless (defined $branches{$branch} ){
$branches{$branch} = [];
}
# 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 $?;
+ if ($?) {
+ # Don't die here, Arch supports one-way cherry-picking
+ # between branches with no common base (or any relationship
+ # at all beforehand)
+ warn "Cannot find merge base for $branch and $ps->{branch}";
+ next;
+ }
chomp $mergebase;
# now walk up to the mergepoint collecting what patches we have
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;
+ $name =~ s|,|/|;
my $ps = $psets{$name}
|| (print Dumper(sort keys %psets)) && die "Cannot find patchset for $name";
return $ps;
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