joey@darkstar:/tmp>git init test Initialized empty Git repository in /tmp/test/.git/ joey@darkstar:/tmp>cd test joey@darkstar:/tmp/test>mkdir sub joey@darkstar:/tmp/test>cd sub joey@darkstar:/tmp/test/sub>GIT_INDEX_FILE=../.git/otherindex git write-tree fatal: Unable to create '/tmp/test/../.git/otherindex.lock': No such file or directory Appears to be a bug in git. Seems that it's assuming GIT_INDEX_FILE is relative to the top of the worktree and not to the CWD. Workaround: Use absolute path to the index file. joey@darkstar:/tmp/test/sub>GIT_INDEX_FILE=`pwd`/../.git/otherindex git write-tree 4b825dc642cb6eb9a060e54bf8d69288fbee4904 joey@darkstar:/tmp/test/sub>ls ../.git/otherindex ../.git/otherindex git version 2.8.1 -- see shy jo
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