Dgit.pm: gdr_ffq_prev_branchinfo: move from git-debrebase

[dgit.git] / Debian / Dgit.pm

diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index ec402e4d270598e3f7f6ec725812ab7582c8c7a4..960f505aa1579036d27f3d7374b18d74490f6e37 100644 (file)
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -44,7 +44,7 @@ BEGIN {
                      server_branch server_ref
                       stat_exists link_ltarget
                      hashfile
-                      fail ensuredir must_getcwd executable_on_path
+                      fail failmsg ensuredir must_getcwd executable_on_path
                       waitstatusmsg failedcmd_waitstatus
                      failedcmd_report_cmd failedcmd
                       runcmd cmdoutput cmdoutput_errok
@@ -57,13 +57,14 @@ BEGIN {
                      $extra_orig_namepart_re
                      $git_null_obj
                       $branchprefix
-                     $ffq_refprefix
+                     $ffq_refprefix $gdrlast_refprefix
                       initdebug enabledebug enabledebuglevel
                       printdebug debugcmd
                       $debugprefix *debuglevel *DEBUG
                       shellquote printcmd messagequote
                       $negate_harmful_gitattrs
                      changedir git_slurp_config_src
+                     gdr_ffq_prev_branchinfo
                      playtree_setup);
     # implicitly uses $main::us
     %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO NOCOMMITCHECK)],
@@ -87,6 +88,7 @@ our $series_filename_re = qr{(?:^|\.)series(?!\n)$}s;
 our $extra_orig_namepart_re = qr{[-0-9a-z]+};
 our $git_null_obj = '0' x 40;
 our $ffq_refprefix = 'ffq-prev';
+our $gdrlast_refprefix = 'debrebase-last';
 
 # policy hook exit status bits
 # see dgit-repos-server head comment for documentation
@@ -220,12 +222,16 @@ sub _us () {
     $::us // ($0 =~ m#[^/]*$#, $&);
 }
 
-sub fail { 
+sub failmsg {
     my $s = "@_\n";
     $s =~ s/\n\n$/\n/;
     my $prefix = _us().": ";
     $s =~ s/^/$prefix/gm;
-    die $s;
+    return $s;
+}
+
+sub fail {
+    die failmsg @_;
 }
 
 sub ensuredir ($) {
@@ -509,6 +515,22 @@ sub git_slurp_config_src ($) {
     return $r;
 }
 
+sub gdr_ffq_prev_branchinfo ($) {
+    my ($symref) = @_;
+    # => ('status', "message", [$symref, $ffq_prev, $gdrlast])
+    # 'status' may be
+    #    branch         message is undef
+    #    weird-symref   } no $symref,
+    #    notbranch      }  no $ffq_prev
+    return ('detached', 'detached HEAD') unless defined $symref;
+    return ('weird-symref', 'HEAD symref is not to refs/')
+       unless $symref =~ m{^refs/};
+    my $ffq_prev = "refs/$ffq_refprefix/$'";
+    my $gdrlast = "refs/$gdrlast_refprefix/$'";
+    printdebug "ffq_prev_branchinfo branch current $symref\n";
+    return ('branch', undef, $symref, $ffq_prev, $gdrlast);
+}
+
 # ========== playground handling ==========
 
 # terminology: