Allow builtin-fetch to work on a detached HEAD

[git.git] / Documentation / gitattributes.txt

diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 46f9d591aa7a3af2235d29308d101b2bfa0bff56..d0e951ee6f1c391459f822b8ecbb4c1237b209db 100644 (file)
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -421,6 +421,23 @@ frotz      unspecified
 ----------------------------------------------------------------
 
 
+Creating an archive
+~~~~~~~~~~~~~~~~~~~
+
+`export-subst`
+^^^^^^^^^^^^^^
+
+If the attribute `export-subst` is set for a file then git will expand
+several placeholders when adding this file to an archive.  The
+expansion depends on the availability of a commit ID, i.e. if
+gitlink:git-archive[1] has been given a tree instead of a commit or a
+tag then no replacement will be done.  The placeholders are the same
+as those for the option `--pretty=format:` of gitlink:git-log[1],
+except that they need to be wrapped like this: `$Format:PLACEHOLDERS$`
+in the file.  E.g. the string `$Format:%H$` will be replaced by the
+commit hash.
+
+
 GIT
 ---
 Part of the gitlink:git[7] suite