14 our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
18 @EXPORT = qw(setup_sigwarn
19 debiantag server_branch server_ref
20 stat_exists fail ensuredir executable_on_path
21 waitstatusmsg failedcmd
22 cmdoutput cmdoutput_errok
23 git_rev_parse git_get_ref git_for_each_ref
24 git_for_each_tag_referring is_fast_fwd
25 $package_re $component_re $deliberately_re
27 initdebug enabledebug enabledebuglevel
29 $debugprefix *debuglevel *DEBUG
30 shellquote printcmd messagequote);
31 # implicitly uses $main::us
32 %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO)] );
33 @EXPORT_OK = @{ $EXPORT_TAGS{policyflags} };
38 our $package_re = '[0-9a-z][-+.0-9a-z]*';
39 our $component_re = '[0-9a-zA-Z][-+.0-9a-zA-Z]*';
40 our $deliberately_re = "(?:TEST-)?$package_re";
41 our $branchprefix = 'dgit';
43 # policy hook exit status bits
44 # see dgit-repos-server head comment for documentation
45 # 1 is reserved in case something fails with `exit 1' and to spot
46 # dynamic loader, runtime, etc., failures, which report 127 or 255
47 sub NOFFCHECK () { return 0x2; }
48 sub FRESHREPO () { return 0x4; }
53 sub setup_sigwarn () {
54 our $sigwarn_mainprocess = $$;
55 $SIG{__WARN__} = sub {
56 die $_[0] unless getppid == $sigwarn_mainprocess;
62 open DEBUG, ">/dev/null" or die $!;
66 open DEBUG, ">&STDERR" or die $!;
71 sub enabledebuglevel ($) {
72 my ($newlevel) = @_; # may be undef (eg from env var)
76 return unless $newlevel;
77 $debuglevel = $newlevel;
82 print DEBUG $debugprefix, @_ or die $! if $debuglevel>0;
85 sub messagequote ($) {
91 s{[\000-\037\177]}{ sprintf "\\x%02x", ord $& }ge;
100 if (!length || m{[^-=_./:0-9a-z]}i) {
107 return join ' ', @out;
112 my $intro = shift @_;
113 print $fh $intro," " or die $!;
114 print $fh shellquote @_ or die $!;
115 print $fh "\n" or die $!;
119 my $extraprefix = shift @_;
120 printcmd(\*DEBUG,$debugprefix.$extraprefix,@_) if $debuglevel>0;
124 my ($v,$distro) = @_;
129 sub server_branch ($) { return "$branchprefix/$_[0]"; }
130 sub server_ref ($) { return "refs/".server_branch($_[0]); }
132 sub stat_exists ($) {
135 return 0 if $!==&ENOENT;
140 $::us // ($0 =~ m#[^/]*$#, $&);
145 my $prefix = _us().": ";
146 $s =~ s/^/$prefix/gm;
151 my ($dir) = @_; # does not create parents
152 return if mkdir $dir;
153 return if $! == EEXIST;
154 die "mkdir $dir: $!";
157 sub executable_on_path ($) {
159 return 1 if $program =~ m{/};
160 my @path = split /:/, ($ENV{PATH} // "/usr/local/bin:/bin:/usr/bin");
161 foreach my $pe (@path) {
162 my $here = "$pe/$program";
163 return $here if stat_exists $here && -x _;
168 our @signames = split / /, $Config{sig_name};
170 sub waitstatusmsg () {
172 return "terminated, reporting successful completion";
173 } elsif (!($? & 255)) {
174 return "failed with error exit status ".WEXITSTATUS($?);
175 } elsif (WIFSIGNALED($?)) {
176 my $signum=WTERMSIG($?);
177 return "died due to fatal signal ".
178 ($signames[$signum] // "number $signum").
179 ($? & 128 ? " (core dumped)" : ""); # POSIX(3pm) has no WCOREDUMP
181 return "failed with unknown wait status ".$?;
186 { local ($!); printcmd \*STDERR, _us().": failed command:", @_ or die $!; };
188 fail "failed to fork/exec: $!";
190 fail "subprocess ".waitstatusmsg();
192 fail "subprocess produced invalid output";
196 sub cmdoutput_errok {
197 die Dumper(\@_)." ?" if grep { !defined } @_;
199 open P, "-|", @_ or die "$_[0] $!";
202 { local $/ = undef; $d = <P>; }
204 if (!close P) { printdebug "=>!$?\n"; return undef; }
206 if ($debuglevel > 0) {
209 my $more = (length $' ? '...' : ''); #');
210 $dd =~ s{[^\n -~]|\\}{ sprintf "\\x%02x", ord $& }ge;
211 printdebug "=> \`$dd'",$more,"\n";
217 my $d = cmdoutput_errok @_;
218 defined $d or failedcmd @_;
222 sub git_rev_parse ($) {
223 return cmdoutput qw(git rev-parse), "$_[0]~0";
226 sub git_for_each_ref ($$;$) {
227 my ($pattern,$func,$gitdir) = @_;
228 # calls $func->($objid,$objtype,$fullrefname,$reftail);
229 # $reftail is RHS of ref after refs/[^/]+/
230 # breaks if $pattern matches any ref `refs/blah' where blah has no `/'
231 my @cmd = (qw(git for-each-ref), $pattern);
232 if (defined $gitdir) {
233 @cmd = ('sh','-ec','cd "$1"; shift; exec "$@"','x', $gitdir, @cmd);
235 open GFER, "-|", @cmd or die $!;
239 printdebug "|> ", $_, "\n";
240 m#^(\w+)\s+(\w+)\s+(refs/[^/]+/(\S+))$# or die "$_ ?";
241 $func->($1,$2,$3,$4);
243 $!=0; $?=0; close GFER or die "$pattern $? $!";
246 sub git_get_ref ($) {
247 # => '' if no such ref
250 s{^refs/}{[r]efs/} or die "$refname $_ ?";
251 return cmdoutput qw(git for-each-ref --format=%(objectname)), $_;
254 sub git_for_each_tag_referring ($$) {
255 my ($objreferring, $func) = @_;
256 # calls $func->($tagobjid,$refobjid,$fullrefname,$tagname);
257 printdebug "git_for_each_tag_referring ",
258 ($objreferring // 'UNDEF'),"\n";
259 git_for_each_ref('refs/tags', sub {
260 my ($tagobjid,$objtype,$fullrefname,$tagname) = @_;
261 return unless $objtype eq 'tag';
262 my $refobjid = git_rev_parse $tagobjid;
264 !defined $objreferring # caller wants them all
265 or $tagobjid eq $objreferring
266 or $refobjid eq $objreferring;
267 $func->($tagobjid,$refobjid,$fullrefname,$tagname);
271 sub is_fast_fwd ($$) {
272 my ($ancestor,$child) = @_;
273 my @cmd = (qw(git merge-base), $ancestor, $child);
274 my $mb = cmdoutput_errok @cmd;
276 return git_rev_parse($mb) eq git_rev_parse($ancestor);
278 $?==256 or failedcmd @cmd;