dgit(7): Discuss git-unrepresentable properties of source trees.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

1 files changed, 11 insertions, 0 deletions

diff --git a/dgit.7 b/dgit.7
index ca11535..7ad5aba 100644
--- a/dgit.7
+++ b/dgit.7
@@ -197,6 +197,17 @@ import existing vcs history
 (which might not be faithful to dgit's invariants)
 or previous non-Dgit uploads
 (which would not provide a very rich history).
+
+git represents only file executability.
+git does not represent empty directories,
+or any leaf objects other than plain files and symlinks.
+The behaviour of Debian source package formats
+on objects with unusual permissions is complicated.
+Some pathological Debian source packages will no longer build
+if empty directories are pruned
+(or if other things not reproduced by git are changed).
+Such sources cannot be worked with properly in git,
+and therefore not with dgit either.
 .SH READ-ONLY DISTROS
 Distros which do not maintain a set of dgit history git repositories
 can still be used in a read-only mode with dgit.  Currently Ubuntu