X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=dgit.git;a=blobdiff_plain;f=Debian%2FDgit.pm;h=bfa76cc70de127d66e1e235db79c0b83e2f2a16e;hp=a453f352718b33a5567e040cdd9302973c40b279;hb=d655b298e3ac4ecba08885ab8c96cdbafc83c155;hpb=05532651f81d706de1fab66e8ebe97b9f646b1f9

diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index a453f352..bfa76cc7 100644
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -5,9 +5,12 @@ package Debian::Dgit;
 use strict;
 use warnings;
 
+use Carp;
 use POSIX;
 use IO::Handle;
 use Config;
+use Digest::SHA;
+use Data::Dumper;
 
 BEGIN {
     use Exporter   ();
@@ -16,8 +19,12 @@ BEGIN {
     $VERSION     = 1.00;
     @ISA         = qw(Exporter);
     @EXPORT      = qw(setup_sigwarn
-                      debiantag server_branch server_ref
-                      stat_exists fail ensuredir waitstatusmsg failedcmd
+                      debiantags debiantag_old debiantag_new
+		      server_branch server_ref
+                      stat_exists link_ltarget
+		      hashfile
+                      fail ensuredir executable_on_path
+                      waitstatusmsg failedcmd
                       cmdoutput cmdoutput_errok
                       git_rev_parse git_get_ref git_for_each_ref
                       git_for_each_tag_referring is_fast_fwd
@@ -119,12 +126,23 @@ sub debugcmd {
     printcmd(\*DEBUG,$debugprefix.$extraprefix,@_) if $debuglevel>0;
 }
 
-sub debiantag ($$) { 
+sub debiantag_old ($$) { 
     my ($v,$distro) = @_;
     $v =~ y/~:/_%/;
     return "$distro/$v";
 }
 
+sub debiantag_new ($$) { 
+    my ($v,$distro) = @_;
+    $v =~ y/~:/_%/;
+    return "archive/$distro/$v";
+}
+
+sub debiantags ($$) {
+    my ($version,$distro) = @_;
+    map { $_->($version, $distro) } (\&debiantag_new, \&debiantag_old);
+}
+
 sub server_branch ($) { return "$branchprefix/$_[0]"; }
 sub server_ref ($) { return "refs/".server_branch($_[0]); }
 
@@ -153,6 +171,17 @@ sub ensuredir ($) {
     die "mkdir $dir: $!";
 }
 
+sub executable_on_path ($) {
+    my ($program) = @_;
+    return 1 if $program =~ m{/};
+    my @path = split /:/, ($ENV{PATH} // "/usr/local/bin:/bin:/usr/bin");
+    foreach my $pe (@path) {
+	my $here = "$pe/$program";
+	return $here if stat_exists $here && -x _;
+    }
+    return undef;
+}
+
 our @signames = split / /, $Config{sig_name};
 
 sub waitstatusmsg () {
@@ -171,8 +200,19 @@ sub waitstatusmsg () {
 }
 
 sub failedcmd {
+    # Expects $!,$? as set by close - see below.
+    # To use with system(), set $?=-1 first.
+    #
+    # Actual behaviour of perl operations:
+    #   success              $!==0       $?==0       close of piped open
+    #   program failed       $!==0       $? >0       close of piped open
+    #   syscall failure      $! >0       $?=-1       close of piped open
+    #   failure              $! >0       unchanged   close of something else
+    #   success              trashed     $?==0       system
+    #   program failed       trashed     $? >0       system
+    #   syscall failure      $! >0       unchanged   system
     { local ($!); printcmd \*STDERR, _us().": failed command:", @_ or die $!; };
-    if ($!) {
+    if ($? < 0) {
 	fail "failed to fork/exec: $!";
     } elsif ($?) {
 	fail "subprocess ".waitstatusmsg();
@@ -182,9 +222,9 @@ sub failedcmd {
 }
 
 sub cmdoutput_errok {
-    die Dumper(\@_)." ?" if grep { !defined } @_;
+    confess Dumper(\@_)." ?" if grep { !defined } @_;
     debugcmd "|",@_;
-    open P, "-|", @_ or die $!;
+    open P, "-|", @_ or die "$_[0] $!";
     my $d;
     $!=0; $?=0;
     { local $/ = undef; $d = <P>; }
@@ -207,6 +247,22 @@ sub cmdoutput {
     return $d;
 }
 
+sub link_ltarget ($$) {
+    my ($old,$new) = @_;
+    lstat $old or return undef;
+    if (-l _) {
+	$old = cmdoutput qw(realpath  --), $old;
+    }
+    link $old, $new or die "link $old $new: $!";
+}
+
+sub hashfile ($) {
+    my ($fn) = @_;
+    my $h = Digest::SHA->new(256);
+    $h->addfile($fn);
+    return $h->hexdigest();
+}
+
 sub git_rev_parse ($) {
     return cmdoutput qw(git rev-parse), "$_[0]~0";
 }
@@ -216,7 +272,9 @@ sub git_for_each_ref ($$;$) {
     # calls $func->($objid,$objtype,$fullrefname,$reftail);
     # $reftail is RHS of ref after refs/[^/]+/
     # breaks if $pattern matches any ref `refs/blah' where blah has no `/'
-    my @cmd = (qw(git for-each-ref), $pattern);
+    # $pattern may be an array ref to mean multiple patterns
+    $pattern = [ $pattern ] unless ref $pattern;
+    my @cmd = (qw(git for-each-ref), @$pattern);
     if (defined $gitdir) {
 	@cmd = ('sh','-ec','cd "$1"; shift; exec "$@"','x', $gitdir, @cmd);
     }