3 # Debian::Dgit: functions common to dgit and its helpers and servers
5 # Copyright (C) 2015-2016 Ian Jackson
7 # This program is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3 of the License, or
10 # (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
34 use Dpkg::Control::Hash;
35 use Debian::Dgit::ExitStatus;
39 our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
43 @EXPORT = qw(setup_sigwarn forkcheck_setup forkcheck_mainprocess
45 debiantags debiantag_old debiantag_new
48 stripepoch source_file_leafname is_orig_file_of_p_v
49 server_branch server_ref
50 stat_exists link_ltarget
52 fail failmsg ensuredir must_getcwd executable_on_path
53 waitstatusmsg failedcmd_waitstatus
54 failedcmd_report_cmd failedcmd
55 runcmd shell_cmd cmdoutput cmdoutput_errok
56 git_rev_parse git_cat_file
57 git_get_ref git_get_symref git_for_each_ref
58 git_for_each_tag_referring is_fast_fwd
60 git_reflog_action_msg git_update_ref_cmd
62 reflog_cache_insert reflog_cache_lookup
63 $package_re $component_re $deliberately_re
64 $distro_re $versiontag_re $series_filename_re
65 $orig_f_comp_re $orig_f_sig_re $orig_f_tail_re
66 $extra_orig_namepart_re
69 $ffq_refprefix $gdrlast_refprefix
70 initdebug enabledebug enabledebuglevel
72 $printdebug_when_debuglevel $debugcmd_when_debuglevel
73 $debugprefix *debuglevel *DEBUG
74 shellquote printcmd messagequote
75 $negate_harmful_gitattrs
76 changedir git_slurp_config_src
77 gdr_ffq_prev_branchinfo
78 parsecontrolfh parsecontrol parsechangelog
79 getfield parsechangelog_loop
81 # implicitly uses $main::us
82 %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO NOCOMMITCHECK)],
83 playground => [qw(record_maindir $maindir $local_git_cfg
84 $maindir_gitdir $maindir_gitcommon
86 ensure_a_playground)]);
87 @EXPORT_OK = ( @{ $EXPORT_TAGS{policyflags} },
88 @{ $EXPORT_TAGS{playground} } );
93 our $package_re = '[0-9a-z][-+.0-9a-z]*';
94 our $component_re = '[0-9a-zA-Z][-+.0-9a-zA-Z]*';
95 our $deliberately_re = "(?:TEST-)?$package_re";
96 our $distro_re = $component_re;
97 our $versiontag_re = qr{[-+.\%_0-9a-zA-Z/]+};
98 our $branchprefix = 'dgit';
99 our $series_filename_re = qr{(?:^|\.)series(?!\n)$}s;
100 our $extra_orig_namepart_re = qr{[-0-9a-z]+};
101 our $orig_f_comp_re = qr{orig(?:-$extra_orig_namepart_re)?};
102 our $orig_f_sig_re = '\\.(?:asc|gpg|pgp)';
103 our $orig_f_tail_re = "$orig_f_comp_re\\.tar(?:\\.\\w+)?(?:$orig_f_sig_re)?";
104 our $git_null_obj = '0' x 40;
105 our $ffq_refprefix = 'ffq-prev';
106 our $gdrlast_refprefix = 'debrebase-last';
107 our $printdebug_when_debuglevel = 1;
108 our $debugcmd_when_debuglevel = 1;
110 # these three all go together, only valid after record_maindir
113 our $maindir_gitcommon;
115 # policy hook exit status bits
116 # see dgit-repos-server head comment for documentation
117 # 1 is reserved in case something fails with `exit 1' and to spot
118 # dynamic loader, runtime, etc., failures, which report 127 or 255
119 sub NOFFCHECK () { return 0x2; }
120 sub FRESHREPO () { return 0x4; }
121 sub NOCOMMITCHECK () { return 0x8; }
126 our $negate_harmful_gitattrs =
127 "-text -eol -crlf -ident -filter -working-tree-encoding";
128 # ^ when updating this, alter the regexp in dgit:is_gitattrs_setup
130 our $forkcheck_mainprocess;
132 sub forkcheck_setup () {
133 $forkcheck_mainprocess = $$;
136 sub forkcheck_mainprocess () {
137 # You must have called forkcheck_setup or setup_sigwarn already
138 getppid != $forkcheck_mainprocess;
141 sub setup_sigwarn () {
143 $SIG{__WARN__} = sub {
144 confess $_[0] if forkcheck_mainprocess;
150 open DEBUG, ">/dev/null" or die $!;
154 open DEBUG, ">&STDERR" or die $!;
159 sub enabledebuglevel ($) {
160 my ($newlevel) = @_; # may be undef (eg from env var)
164 return unless $newlevel;
165 $debuglevel = $newlevel;
170 # Prints a prefix, and @_, to DEBUG. @_ should normally contain
173 # With no (or only empty) arguments just prints the prefix and
174 # leaves the caller to do more with DEBUG. The caller should make
175 # sure then to call printdebug with something ending in "\n" to
176 # get the prefix right in subsequent calls.
178 return unless $debuglevel >= $printdebug_when_debuglevel;
179 our $printdebug_noprefix;
180 print DEBUG $debugprefix unless $printdebug_noprefix;
181 pop @_ while @_ and !length $_[-1];
183 print DEBUG @_ or die $!;
184 $printdebug_noprefix = $_[-1] !~ m{\n$};
187 sub messagequote ($) {
193 s{[\000-\037\177]}{ sprintf "\\x%02x", ord $& }ge;
200 defined or confess 'internal error' foreach @_;
203 if (!length || m{[^-=_./:0-9a-z]}i) {
210 return join ' ', @out;
215 my $intro = shift @_;
216 print $fh $intro," " or die $!;
217 print $fh shellquote @_ or die $!;
218 print $fh "\n" or die $!;
222 my $extraprefix = shift @_;
223 printcmd(\*DEBUG,$debugprefix.$extraprefix,@_)
224 if $debuglevel >= $debugcmd_when_debuglevel;
227 sub dep14_version_mangle ($) {
229 # DEP-14 patch proposed 2016-11-09 "Version Mangling"
231 $v =~ s/\.(?=\.|$|lock$)/.#/g;
235 sub debiantag_old ($$) {
236 my ($v,$distro) = @_;
237 return "$distro/". dep14_version_mangle $v;
240 sub debiantag_new ($$) {
241 my ($v,$distro) = @_;
242 return "archive/$distro/".dep14_version_mangle $v;
245 sub debiantag_maintview ($$) {
246 my ($v,$distro) = @_;
247 return "$distro/".dep14_version_mangle $v;
250 sub debiantags ($$) {
251 my ($version,$distro) = @_;
252 map { $_->($version, $distro) } (\&debiantag_new, \&debiantag_old);
261 sub upstreamversion ($) {
267 sub source_file_leafname ($$$) {
268 my ($package,$vsn,$sfx) = @_;
269 return "${package}_".(stripepoch $vsn).$sfx
272 sub is_orig_file_of_p_v ($$$) {
273 my ($f, $package, $upstreamvsn) = @_;
274 my $base = source_file_leafname $package, $upstreamvsn, '';
275 return 0 unless $f =~ m/^\Q$base\E\.$orig_f_tail_re$/;
279 sub server_branch ($) { return "$branchprefix/$_[0]"; }
280 sub server_ref ($) { return "refs/".server_branch($_[0]); }
282 sub stat_exists ($) {
285 return 0 if $!==&ENOENT;
290 $::us // ($0 =~ m#[^/]*$#, $&);
294 my $s = "error: @_\n";
296 my $prefix = _us().": ";
297 $s =~ s/^/$prefix/gm;
306 my ($dir) = @_; # does not create parents
307 return if mkdir $dir;
308 return if $! == EEXIST;
309 die "mkdir $dir: $!";
314 defined $d or fail "getcwd failed: $!";
318 sub executable_on_path ($) {
320 return 1 if $program =~ m{/};
321 my @path = split /:/, ($ENV{PATH} // "/usr/local/bin:/bin:/usr/bin");
322 foreach my $pe (@path) {
323 my $here = "$pe/$program";
324 return $here if stat_exists $here && -x _;
329 our @signames = split / /, $Config{sig_name};
331 sub waitstatusmsg () {
333 return "terminated, reporting successful completion";
334 } elsif (!($? & 255)) {
335 return "failed with error exit status ".WEXITSTATUS($?);
336 } elsif (WIFSIGNALED($?)) {
337 my $signum=WTERMSIG($?);
338 return "died due to fatal signal ".
339 ($signames[$signum] // "number $signum").
340 ($? & 128 ? " (core dumped)" : ""); # POSIX(3pm) has no WCOREDUMP
342 return "failed with unknown wait status ".$?;
346 sub failedcmd_report_cmd {
347 my $intro = shift @_;
348 $intro //= "failed command";
349 { local ($!); printcmd \*STDERR, _us().": $intro:", @_ or die $!; };
352 sub failedcmd_waitstatus {
354 return "failed to fork/exec: $!";
356 return "subprocess ".waitstatusmsg();
358 return "subprocess produced invalid output";
363 # Expects $!,$? as set by close - see below.
364 # To use with system(), set $?=-1 first.
366 # Actual behaviour of perl operations:
367 # success $!==0 $?==0 close of piped open
368 # program failed $!==0 $? >0 close of piped open
369 # syscall failure $! >0 $?=-1 close of piped open
370 # failure $! >0 unchanged close of something else
371 # success trashed $?==0 system
372 # program failed trashed $? >0 system
373 # syscall failure $! >0 unchanged system
374 failedcmd_report_cmd undef, @_;
375 fail failedcmd_waitstatus();
381 failedcmd @_ if system @_;
385 my ($first_shell, @cmd) = @_;
386 return qw(sh -ec), $first_shell.'; exec "$@"', 'x', @cmd;
389 sub cmdoutput_errok {
390 confess Dumper(\@_)." ?" if grep { !defined } @_;
391 local $printdebug_when_debuglevel = $debugcmd_when_debuglevel;
393 open P, "-|", @_ or die "$_[0] $!";
396 { local $/ = undef; $d = <P>; }
398 if (!close P) { printdebug "=>!$?\n"; return undef; }
400 if ($debuglevel > 0) {
403 my $more = (length $' ? '...' : ''); #');
404 $dd =~ s{[^\n -~]|\\}{ sprintf "\\x%02x", ord $& }ge;
405 printdebug "=> \`$dd'",$more,"\n";
411 my $d = cmdoutput_errok @_;
412 defined $d or failedcmd @_;
416 sub link_ltarget ($$) {
418 lstat $old or return undef;
420 $old = cmdoutput qw(realpath --), $old;
422 my $r = link $old, $new;
423 $r = symlink $old, $new if !$r && $!==EXDEV;
424 $r or die "(sym)link $old $new: $!";
429 my $h = Digest::SHA->new(256);
431 return $h->hexdigest();
434 sub git_rev_parse ($) {
435 return cmdoutput qw(git rev-parse), "$_[0]~0";
438 sub git_cat_file ($;$) {
439 my ($objname, $etype) = @_;
440 # => ($type, $data) or ('missing', undef)
441 # in scalar context, just the data
442 # if $etype defined, dies unless type is $etype or in @$etype
443 our ($gcf_pid, $gcf_i, $gcf_o);
444 local $printdebug_when_debuglevel = $debugcmd_when_debuglevel;
446 my ($gtype, $data) = @_;
448 $etype = [$etype] unless ref $etype;
449 confess "$objname expected @$etype but is $gtype"
450 unless grep { $gtype eq $_ } @$etype;
452 return ($gtype, $data);
455 my @cmd = qw(git cat-file --batch);
456 debugcmd "GCF|", @cmd;
457 $gcf_pid = open2 $gcf_o, $gcf_i, @cmd or die $!;
459 printdebug "GCF>| ", $objname, "\n";
460 print $gcf_i $objname, "\n" or die $!;
462 printdebug "GCF<| ", $x;
463 if ($x =~ m/ (missing)$/) { return $chk->($1, undef); }
464 my ($type, $size) = $x =~ m/^.* (\w+) (\d+)\n/ or die "$objname ?";
466 (read $gcf_o, $data, $size) == $size or die "$objname $!";
468 $x eq "\n" or die "$objname ($_) $!";
469 return $chk->($type, $data);
472 sub git_get_symref (;$) {
473 my ($symref) = @_; $symref //= 'HEAD';
474 # => undef if not a symref, otherwise refs/...
475 my @cmd = (qw(git symbolic-ref -q HEAD));
476 my $branch = cmdoutput_errok @cmd;
477 if (!defined $branch) {
478 $?==256 or failedcmd @cmd;
485 sub git_for_each_ref ($$;$) {
486 my ($pattern,$func,$gitdir) = @_;
487 # calls $func->($objid,$objtype,$fullrefname,$reftail);
488 # $reftail is RHS of ref after refs/[^/]+/
489 # breaks if $pattern matches any ref `refs/blah' where blah has no `/'
490 # $pattern may be an array ref to mean multiple patterns
491 $pattern = [ $pattern ] unless ref $pattern;
492 my @cmd = (qw(git for-each-ref), @$pattern);
493 if (defined $gitdir) {
494 @cmd = ('sh','-ec','cd "$1"; shift; exec "$@"','x', $gitdir, @cmd);
496 open GFER, "-|", @cmd or die $!;
500 printdebug "|> ", $_, "\n";
501 m#^(\w+)\s+(\w+)\s+(refs/[^/]+/(\S+))$# or die "$_ ?";
502 $func->($1,$2,$3,$4);
504 $!=0; $?=0; close GFER or die "$pattern $? $!";
507 sub git_get_ref ($) {
508 # => '' if no such ref
511 s{^refs/}{[r]efs/} or die "$refname $_ ?";
512 return cmdoutput qw(git for-each-ref --format=%(objectname)), $_;
515 sub git_for_each_tag_referring ($$) {
516 my ($objreferring, $func) = @_;
517 # calls $func->($tagobjid,$refobjid,$fullrefname,$tagname);
518 printdebug "git_for_each_tag_referring ",
519 ($objreferring // 'UNDEF'),"\n";
520 git_for_each_ref('refs/tags', sub {
521 my ($tagobjid,$objtype,$fullrefname,$tagname) = @_;
522 return unless $objtype eq 'tag';
523 my $refobjid = git_rev_parse $tagobjid;
525 !defined $objreferring # caller wants them all
526 or $tagobjid eq $objreferring
527 or $refobjid eq $objreferring;
528 $func->($tagobjid,$refobjid,$fullrefname,$tagname);
532 sub git_check_unmodified () {
533 foreach my $cached (qw(0 1)) {
534 my @cmd = qw(git diff --quiet);
535 push @cmd, qw(--cached) if $cached;
538 $!=0; $?=-1; system @cmd;
543 ? "git index contains changes (does not match HEAD)"
544 : "working tree is dirty (does not match HEAD)";
551 sub is_fast_fwd ($$) {
552 my ($ancestor,$child) = @_;
553 my @cmd = (qw(git merge-base), $ancestor, $child);
554 my $mb = cmdoutput_errok @cmd;
556 return git_rev_parse($mb) eq git_rev_parse($ancestor);
558 $?==256 or failedcmd @cmd;
563 sub git_reflog_action_msg ($) {
565 my $rla = $ENV{GIT_REFLOG_ACTION};
566 $msg = "$rla: $msg" if length $rla;
570 sub git_update_ref_cmd {
571 # returns qw(git update-ref), qw(-m), @_
572 # except that message may be modified to honour GIT_REFLOG_ACTION
574 $msg = git_reflog_action_msg $msg;
575 return qw(git update-ref -m), $msg, @_;
580 printdebug "CD $newdir\n";
581 chdir $newdir or confess "chdir: $newdir: $!";
584 sub git_slurp_config_src ($) {
586 # returns $r such that $r->{KEY}[] = VALUE
587 my @cmd = (qw(git config -z --get-regexp), "--$src", qw(.*));
590 local ($debuglevel) = $debuglevel-2;
594 open GITS, "-|", @cmd or die $!;
597 printdebug "=> ", (messagequote $_), "\n";
599 push @{ $r->{$`} }, $'; #';
603 or ($!==0 && $?==256)
608 sub gdr_ffq_prev_branchinfo ($) {
610 # => ('status', "message", [$symref, $ffq_prev, $gdrlast])
612 # branch message is undef
613 # weird-symref } no $symref,
614 # notbranch } no $ffq_prev
615 return ('detached', 'detached HEAD') unless defined $symref;
616 return ('weird-symref', 'HEAD symref is not to refs/')
617 unless $symref =~ m{^refs/};
618 my $ffq_prev = "refs/$ffq_refprefix/$'";
619 my $gdrlast = "refs/$gdrlast_refprefix/$'";
620 printdebug "ffq_prev_branchinfo branch current $symref\n";
621 return ('branch', undef, $symref, $ffq_prev, $gdrlast);
624 sub parsecontrolfh ($$;$) {
625 my ($fh, $desc, $allowsigned) = @_;
626 our $dpkgcontrolhash_noissigned;
629 my %opts = ('name' => $desc);
630 $opts{allow_pgp}= $allowsigned || !$dpkgcontrolhash_noissigned;
631 $c = Dpkg::Control::Hash->new(%opts);
632 $c->parse($fh,$desc) or die "parsing of $desc failed";
633 last if $allowsigned;
634 last if $dpkgcontrolhash_noissigned;
635 my $issigned= $c->get_option('is_pgp_signed');
636 if (!defined $issigned) {
637 $dpkgcontrolhash_noissigned= 1;
638 seek $fh, 0,0 or die "seek $desc: $!";
639 } elsif ($issigned) {
640 fail "control file $desc is (already) PGP-signed. ".
641 " Note that dgit push needs to modify the .dsc and then".
642 " do the signature itself";
651 my ($file, $desc, $allowsigned) = @_;
652 my $fh = new IO::Handle;
653 open $fh, '<', $file or die "$file: $!";
654 my $c = parsecontrolfh($fh,$desc,$allowsigned);
655 $fh->error and die $!;
661 my $c = Dpkg::Control::Hash->new(name => 'parsed changelog');
662 my $p = new IO::Handle;
663 my @cmd = (qw(dpkg-parsechangelog), @_);
664 open $p, '-|', @cmd or die $!;
666 $?=0; $!=0; close $p or failedcmd @cmd;
671 my ($dctrl,$field) = @_;
672 my $v = $dctrl->{$field};
673 return $v if defined $v;
674 fail "missing field $field in ".$dctrl->get_option('name');
677 sub parsechangelog_loop ($$$) {
678 my ($clogcmd, $descbase, $fn) = @_;
679 # @$clogcmd is qw(dpkg-parsechangelog ...some...options...)
680 # calls $fn->($thisstanza, $desc);
681 debugcmd "|",@$clogcmd;
682 open CLOGS, "-|", @$clogcmd or die $!;
684 my $stanzatext = do { local $/=""; <CLOGS>; };
685 printdebug "clogp stanza ".Dumper($stanzatext) if $debuglevel>1;
686 last if !defined $stanzatext;
688 my $desc = "$descbase, entry no.$.";
689 open my $stanzafh, "<", \$stanzatext or die;
690 my $thisstanza = parsecontrolfh $stanzafh, $desc, 1;
692 $fn->($thisstanza, $desc);
694 die $! if CLOGS->error;
695 close CLOGS or $?==SIGPIPE or failedcmd @$clogcmd;
698 sub make_commit_text ($) {
701 my @cmd = (qw(git hash-object -w -t commit --stdin));
703 print Dumper($text) if $debuglevel > 1;
704 my $child = open2($out, $in, @cmd) or die $!;
707 print $in $text or die $!;
710 $h =~ m/^\w+$/ or die;
712 printdebug "=> $h\n";
715 waitpid $child, 0 == $child or die "$child $!";
716 $? and failedcmd @cmd;
720 sub reflog_cache_insert ($$$) {
721 my ($ref, $cachekey, $value) = @_;
722 # you must call this in $maindir
723 # you must have called record_maindir
725 # When we no longer need to support squeeze, use --create-reflog
727 my $parent = $ref; $parent =~ s{/[^/]+$}{};
728 ensuredir "$maindir_gitcommon/logs/$parent";
729 my $makelogfh = new IO::File "$maindir_gitcommon/logs/$ref", '>>'
732 my $oldcache = git_get_ref $ref;
734 if ($oldcache eq $value) {
735 my $tree = cmdoutput qw(git rev-parse), "$value:";
736 # git update-ref doesn't always update, in this case. *sigh*
737 my $authline = (ucfirst _us()).
738 ' <'._us().'@example.com> 1000000000 +0000';
739 my $dummy = make_commit_text <<END;
745 Dummy commit - do not use
747 runcmd qw(git update-ref -m), _us()." - dummy", $ref, $dummy;
749 runcmd qw(git update-ref -m), $cachekey, $ref, $value;
752 sub reflog_cache_lookup ($$) {
753 my ($ref, $cachekey) = @_;
754 # you may call this in $maindir or in a playtree
755 # you must have called record_maindir
756 my @cmd = (qw(git log -g), '--pretty=format:%H %gs', $ref);
757 debugcmd "|(probably)",@cmd;
758 my $child = open GC, "-|"; defined $child or die $!;
760 chdir $maindir or die $!;
761 if (!stat "$maindir_gitcommon/logs/$ref") {
762 $! == ENOENT or die $!;
763 printdebug ">(no reflog)\n";
770 printdebug ">| ", $_, "\n" if $debuglevel > 1;
771 next unless m/^(\w+) (\S.*\S)$/ && $2 eq $cachekey;
776 failedcmd unless close GC;
780 # ========== playground handling ==========
784 # $maindir user's git working tree
785 # playground area in .git/ where we can make files, unpack, etc. etc.
786 # playtree git working tree sharing object store with the user's
787 # inside playground, or identical to it
791 # $local_git_cfg hash of arrays of values: git config from $maindir
793 # expected calling pattern
798 # must be run in directory containing .git
799 # assigns to $maindir if not already set
800 # also calls git_slurp_config_src to record git config
801 # in $local_git_cfg, unless it's already set
803 # fresh_playground SUBDIR_PATH_COMPONENTS
804 # e.g fresh_playground 'dgit/unpack' ('.git/' is implied)
805 # default SUBDIR_PATH_COMPONENTS is playground_subdir
806 # calls record_maindir
807 # sets up a new playground (destroying any old one)
808 # returns playground pathname
809 # caller may call multiple times with different subdir paths
810 # createing different playgrounds
812 # ensure_a_playground SUBDIR_PATH_COMPONENTS
813 # like fresh_playground except:
814 # merely ensures the directory exists; does not delete an existing one
818 # changedir playground
821 # playtree_setup $local_git_cfg
822 # # ^ call in some (perhaps trivial) subdir of playground
826 # ----- maindir -----
830 sub record_maindir () {
831 if (!defined $maindir) {
832 $maindir = must_getcwd();
833 if (!stat "$maindir/.git") {
834 fail "cannot stat $maindir/.git: $!";
837 # we fall back to this in case we have a pre-worktree
838 # git, which may not know git rev-parse --git-common-dir
839 $maindir_gitdir = "$maindir/.git";
840 $maindir_gitcommon = "$maindir/.git";
842 $maindir_gitdir = cmdoutput qw(git rev-parse --git-dir);
843 $maindir_gitcommon = cmdoutput qw(git rev-parse --git-common-dir);
846 $local_git_cfg //= git_slurp_config_src 'local';
849 # ----- playgrounds -----
851 sub ensure_a_playground_parent ($) {
854 $spc = "$maindir_gitdir/$spc";
855 my $parent = dirname $spc;
856 mkdir $parent or $!==EEXIST
857 or fail "failed to mkdir playground parent $parent: $!";
861 sub ensure_a_playground ($) {
863 $spc = ensure_a_playground_parent $spc;
864 mkdir $spc or $!==EEXIST or fail "failed to mkdir a playground $spc: $!";
868 sub fresh_playground ($) {
870 $spc = ensure_a_playground_parent $spc;
872 mkdir $spc or fail "failed to mkdir the playground $spc: $!";
876 # ----- playtrees -----
878 sub playtree_setup (;$) {
879 my ($t_local_git_cfg) = @_;
880 $t_local_git_cfg //= $local_git_cfg;
881 # for use in the playtree
882 # $maindir must be set, eg by calling record_maindir or fresh_playground
883 runcmd qw(git init -q);
884 runcmd qw(git config gc.auto 0);
885 foreach my $copy (qw(user.email user.name user.useConfigOnly
886 core.sharedRepository
887 core.compression core.looseCompression
888 core.bigFileThreshold core.fsyncObjectFiles)) {
889 my $v = $t_local_git_cfg->{$copy};
891 runcmd qw(git config), $copy, $_ foreach @$v;
893 # this is confusing: we have
894 # . playtree, not a worktree, has .git/, our cwd
895 # $maindir might be a worktree so
896 # $maindir_gitdir contains our main working "dgit", HEAD, etc.
897 # $maindir_gitcommon the shared stuff, including .objects
898 rmtree('.git/objects');
899 symlink "$maindir_gitcommon/objects",'.git/objects' or die $!;
900 ensuredir '.git/info';
901 open GA, "> .git/info/attributes" or die $!;
902 print GA "* $negate_harmful_gitattrs\n" or die $!;