path: root/Documentation/technical/hash-function-transition.txt
diff options
authorÆvar Arnfjörð Bjarmason <>2018-03-26 18:27:07 (GMT)
committerJunio C Hamano <>2018-03-28 02:07:51 (GMT)
commit45fa195ff0b7a440fae02da1d871f976afa32dff (patch)
treefb03de6cba2cca8fad80e4060bc5131e610a4d3b /Documentation/technical/hash-function-transition.txt
parent90bbd502d54fe920356fa9278055dc9c9bfe9a56 (diff)
doc hash-function-transition: clarify how older gits die on NewHash
Change the "Repository format extension" to accurately describe what happens with different versions of Git when they encounter NewHash repositories, instead of only saying what happens with versions v2.7.0 and later. See ab9cb76f66 ("Repository format version check.", 2005-11-25) and 00a09d57eb ("introduce "extensions" form of core.repositoryformatversion", 2015-06-23) for the relevant changes to the setup code where these variables are checked. Signed-off-by: Ævar Arnfjörð Bjarmason <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'Documentation/technical/hash-function-transition.txt')
1 files changed, 8 insertions, 3 deletions
diff --git a/Documentation/technical/hash-function-transition.txt b/Documentation/technical/hash-function-transition.txt
index 417ba49..34396f1 100644
--- a/Documentation/technical/hash-function-transition.txt
+++ b/Documentation/technical/hash-function-transition.txt
@@ -116,10 +116,15 @@ Documentation/technical/repository-version.txt) with extensions
objectFormat = newhash
compatObjectFormat = sha1
-Specifying a repository format extension ensures that versions of Git
-not aware of NewHash do not try to operate on these repositories,
-instead producing an error message:
+The combination of setting `core.repositoryFormatVersion=1` and
+populating `extensions.*` ensures that all versions of Git later than
+`v0.99.9l` will die instead of trying to operate on the NewHash
+repository, instead producing an error message.
+ # Between v0.99.9l and v2.7.0
+ $ git status
+ fatal: Expected git repo version <= 0, found 1
+ # After v2.7.0
$ git status
fatal: unknown repository extensions found: