dgit(1): Document --[no]-chase-dsc-distro

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

1 files changed, 34 insertions, 5 deletions

diff --git a/dgit.1 b/dgit.1
index 63a7021..76e6cd7 100644
--- a/dgit.1
+++ b/dgit.1
@@ -266,6 +266,16 @@ and it therefore does not
 make a pseudomerge to bind the import
 into any existing git history.
 
+Because a .dsc can contain a Dgit field naming a git commit
+(which you might not have),
+and specifying where to find that commit
+(and any history rewrite table),
+import-dsc might need online access.
+If this is a problem
+(or dgit's efforts to find the commit fail),
+consider --no-chase-dsc-distro
+or --force-import-dsc-with-dgit-field.
+
 There is only only sub-option:
 
 .B --require-valid-signature
@@ -297,11 +307,6 @@ If
 .I branch
 does not start with refs/, refs/heads/ is prepended.
 The specified branch is unconditionally updated.
-
-If the specified .dsc contains a Dgit field,
-dgit will simply make a branch of that commit.
-If you cannot manage to find that commit anywhere,
-consider --force-import-dsc-with-dgit-field.
 .TP
 .B dgit version
 Prints version information and exits.
@@ -456,6 +461,30 @@ someone should make a suitable dgit push
 to update the contents of dgit-repos
 to a version without the controversial changes.
 .TP
+.BR --no-chase-dsc-distro
+Tells dgit not to look online
+for additional git repositories
+containing information about a particular .dsc being imported.
+Chasing is the default.
+
+For most operations
+(such as fetch and pull),
+disabling chasing
+means dgit will access only the git server
+for the distro you are directly working with,
+even if the .dsc was copied verbatim from another distro.
+For import-dsc,
+disabling chasing
+means dgit will work completely offline.
+
+Disabling chasing can be hazardous:
+if the .dsc names a git commit which has been rewritten
+by those in charge of the distro,
+this option may prevent that rewrite from being effective.
+Also,
+using it can mean that
+dgit fails to find necessary git commits.
+.TP
 .BR --dgit-view-save= \fIbranch\fR|\fIref\fR
 Specifies that when a split view quilt mode is in operation,
 and dgit calculates