X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=Documentation%2Fgitattributes.txt;h=d0e951ee6f1c391459f822b8ecbb4c1237b209db;hb=b3abdd9d216c578383b66bb10b95edb3380640e7;hp=46f9d591aa7a3af2235d29308d101b2bfa0bff56;hpb=4e837a98b65fbe0c83376cae5167605b771421d8;p=git.git

diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 46f9d591a..d0e951ee6 100644
--- 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