Dgit.pm: Move read-tree wrappers from git-debrebase

[dgit.git] / Debian / Dgit.pm

diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index 892ebf9b1cb021e9ffcdbe52afc1e6c0315dece9..f1ea1e855737c9bbe8cdd4f60c92eab7aae9f9f4 100644 (file)
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -45,7 +45,8 @@ BEGIN {
                      dep14_version_mangle
                       debiantags debiantag_new
                      debiantag_maintview
-                     upstreamversion upstream_commitish_search
+                     upstreamversion
+                     upstream_commitish_search resolve_upstream_version
                      stripepoch source_file_leafname is_orig_file_of_p_v
                      server_branch server_ref
                       stat_exists link_ltarget rename_link_xf
@@ -59,6 +60,8 @@ BEGIN {
                       git_for_each_tag_referring is_fast_fwd
                      git_check_unmodified
                      git_reflog_action_msg  git_update_ref_cmd
+                     rm_subdir_cached read_tree_subdir
+                     read_tree_debian read_tree_upstream
                      make_commit_text
                      reflog_cache_insert reflog_cache_lookup
                       $package_re $component_re $deliberately_re
@@ -628,6 +631,28 @@ sub upstream_commitish_search ($$) {
     }
 }
 
+sub resolve_upstream_version ($$) {
+    my ($new_upstream, $upstream_version) = @_;
+
+    my $used = $new_upstream;
+    if (!defined $new_upstream) {
+       my @tried;
+       $new_upstream = upstream_commitish_search $upstream_version, \@tried;
+       if (!length $new_upstream) {
+           fail f_
+               "Could not determine appropriate upstream commitish.\n".
+               " (Tried these tags: %s)\n".
+               " Check version, and specify upstream commitish explicitly.",
+               "@tried";
+       }
+       $used = $tried[-1];
+    }
+    $new_upstream = git_rev_parse $new_upstream;
+
+    return ($new_upstream, $used);
+    # used is a human-readable idea of what we found
+}
+
 sub is_fast_fwd ($$) {
     my ($ancestor,$child) = @_;
     my @cmd = (qw(git merge-base), $ancestor, $child);
@@ -655,6 +680,35 @@ sub git_update_ref_cmd {
     return qw(git update-ref -m), $msg, @_;
 }
 
+sub rm_subdir_cached ($) {
+    my ($subdir) = @_;
+    runcmd qw(git rm --quiet -rf --cached --ignore-unmatch), $subdir;
+}
+
+sub read_tree_subdir ($$) {
+    my ($subdir, $new_tree_object) = @_;
+    rm_subdir_cached $subdir;
+    runcmd qw(git read-tree), "--prefix=$subdir/", $new_tree_object;
+}
+
+sub read_tree_debian ($) {
+    my ($treeish) = @_;
+    read_tree_subdir 'debian', "$treeish:debian";
+    rm_subdir_cached 'debian/patches';
+}
+
+sub read_tree_upstream ($;$$) {
+    my ($treeish, $keep_patches, $tree_with_debian) = @_;
+    # if $tree_with_debian is supplied, will use that for debian/
+    # otherwise will save and restore it.
+    my $debian =
+       $tree_with_debian ? "$tree_with_debian:debian"
+       : cmdoutput qw(git write-tree --prefix=debian/);
+    runcmd qw(git read-tree), $treeish;
+    read_tree_subdir 'debian', $debian;
+    rm_subdir_cached 'debian/patches' unless $keep_patches;
+}
+
 sub changedir ($) {
     my ($newdir) = @_;
     printdebug "CD $newdir\n";