14 our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
18 @EXPORT = qw(setup_sigwarn
19 debiantag server_branch server_ref
20 stat_exists link_ltarget
21 fail ensuredir executable_on_path
22 waitstatusmsg failedcmd
23 cmdoutput cmdoutput_errok
24 git_rev_parse git_get_ref git_for_each_ref
25 git_for_each_tag_referring is_fast_fwd
26 $package_re $component_re $deliberately_re
28 initdebug enabledebug enabledebuglevel
30 $debugprefix *debuglevel *DEBUG
31 shellquote printcmd messagequote);
32 # implicitly uses $main::us
33 %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO)] );
34 @EXPORT_OK = @{ $EXPORT_TAGS{policyflags} };
39 our $package_re = '[0-9a-z][-+.0-9a-z]*';
40 our $component_re = '[0-9a-zA-Z][-+.0-9a-zA-Z]*';
41 our $deliberately_re = "(?:TEST-)?$package_re";
42 our $branchprefix = 'dgit';
44 # policy hook exit status bits
45 # see dgit-repos-server head comment for documentation
46 # 1 is reserved in case something fails with `exit 1' and to spot
47 # dynamic loader, runtime, etc., failures, which report 127 or 255
48 sub NOFFCHECK () { return 0x2; }
49 sub FRESHREPO () { return 0x4; }
54 sub setup_sigwarn () {
55 our $sigwarn_mainprocess = $$;
56 $SIG{__WARN__} = sub {
57 die $_[0] unless getppid == $sigwarn_mainprocess;
63 open DEBUG, ">/dev/null" or die $!;
67 open DEBUG, ">&STDERR" or die $!;
72 sub enabledebuglevel ($) {
73 my ($newlevel) = @_; # may be undef (eg from env var)
77 return unless $newlevel;
78 $debuglevel = $newlevel;
83 print DEBUG $debugprefix, @_ or die $! if $debuglevel>0;
86 sub messagequote ($) {
92 s{[\000-\037\177]}{ sprintf "\\x%02x", ord $& }ge;
101 if (!length || m{[^-=_./:0-9a-z]}i) {
108 return join ' ', @out;
113 my $intro = shift @_;
114 print $fh $intro," " or die $!;
115 print $fh shellquote @_ or die $!;
116 print $fh "\n" or die $!;
120 my $extraprefix = shift @_;
121 printcmd(\*DEBUG,$debugprefix.$extraprefix,@_) if $debuglevel>0;
125 my ($v,$distro) = @_;
130 sub server_branch ($) { return "$branchprefix/$_[0]"; }
131 sub server_ref ($) { return "refs/".server_branch($_[0]); }
133 sub stat_exists ($) {
136 return 0 if $!==&ENOENT;
141 $::us // ($0 =~ m#[^/]*$#, $&);
146 my $prefix = _us().": ";
147 $s =~ s/^/$prefix/gm;
152 my ($dir) = @_; # does not create parents
153 return if mkdir $dir;
154 return if $! == EEXIST;
155 die "mkdir $dir: $!";
158 sub executable_on_path ($) {
160 return 1 if $program =~ m{/};
161 my @path = split /:/, ($ENV{PATH} // "/usr/local/bin:/bin:/usr/bin");
162 foreach my $pe (@path) {
163 my $here = "$pe/$program";
164 return $here if stat_exists $here && -x _;
169 our @signames = split / /, $Config{sig_name};
171 sub waitstatusmsg () {
173 return "terminated, reporting successful completion";
174 } elsif (!($? & 255)) {
175 return "failed with error exit status ".WEXITSTATUS($?);
176 } elsif (WIFSIGNALED($?)) {
177 my $signum=WTERMSIG($?);
178 return "died due to fatal signal ".
179 ($signames[$signum] // "number $signum").
180 ($? & 128 ? " (core dumped)" : ""); # POSIX(3pm) has no WCOREDUMP
182 return "failed with unknown wait status ".$?;
187 { local ($!); printcmd \*STDERR, _us().": failed command:", @_ or die $!; };
189 fail "failed to fork/exec: $!";
191 fail "subprocess ".waitstatusmsg();
193 fail "subprocess produced invalid output";
197 sub cmdoutput_errok {
198 die Dumper(\@_)." ?" if grep { !defined } @_;
200 open P, "-|", @_ or die "$_[0] $!";
203 { local $/ = undef; $d = <P>; }
205 if (!close P) { printdebug "=>!$?\n"; return undef; }
207 if ($debuglevel > 0) {
210 my $more = (length $' ? '...' : ''); #');
211 $dd =~ s{[^\n -~]|\\}{ sprintf "\\x%02x", ord $& }ge;
212 printdebug "=> \`$dd'",$more,"\n";
218 my $d = cmdoutput_errok @_;
219 defined $d or failedcmd @_;
223 sub link_ltarget ($$) {
225 lstat $old or return undef;
227 $old = cmdoutput qw(realpath --), $old;
229 link $old, $new or die "link $old $new: $!";
232 sub git_rev_parse ($) {
233 return cmdoutput qw(git rev-parse), "$_[0]~0";
236 sub git_for_each_ref ($$;$) {
237 my ($pattern,$func,$gitdir) = @_;
238 # calls $func->($objid,$objtype,$fullrefname,$reftail);
239 # $reftail is RHS of ref after refs/[^/]+/
240 # breaks if $pattern matches any ref `refs/blah' where blah has no `/'
241 my @cmd = (qw(git for-each-ref), $pattern);
242 if (defined $gitdir) {
243 @cmd = ('sh','-ec','cd "$1"; shift; exec "$@"','x', $gitdir, @cmd);
245 open GFER, "-|", @cmd or die $!;
249 printdebug "|> ", $_, "\n";
250 m#^(\w+)\s+(\w+)\s+(refs/[^/]+/(\S+))$# or die "$_ ?";
251 $func->($1,$2,$3,$4);
253 $!=0; $?=0; close GFER or die "$pattern $? $!";
256 sub git_get_ref ($) {
257 # => '' if no such ref
260 s{^refs/}{[r]efs/} or die "$refname $_ ?";
261 return cmdoutput qw(git for-each-ref --format=%(objectname)), $_;
264 sub git_for_each_tag_referring ($$) {
265 my ($objreferring, $func) = @_;
266 # calls $func->($tagobjid,$refobjid,$fullrefname,$tagname);
267 printdebug "git_for_each_tag_referring ",
268 ($objreferring // 'UNDEF'),"\n";
269 git_for_each_ref('refs/tags', sub {
270 my ($tagobjid,$objtype,$fullrefname,$tagname) = @_;
271 return unless $objtype eq 'tag';
272 my $refobjid = git_rev_parse $tagobjid;
274 !defined $objreferring # caller wants them all
275 or $tagobjid eq $objreferring
276 or $refobjid eq $objreferring;
277 $func->($tagobjid,$refobjid,$fullrefname,$tagname);
281 sub is_fast_fwd ($$) {
282 my ($ancestor,$child) = @_;
283 my @cmd = (qw(git merge-base), $ancestor, $child);
284 my $mb = cmdoutput_errok @cmd;
286 return git_rev_parse($mb) eq git_rev_parse($ancestor);
288 $?==256 or failedcmd @cmd;