Hi Ondra
On 13/05/2024 08:26, Ondra Medek wrote:
Hello,
I need a simple script for unskilled users to do a fast checkout (LFS
friendly) of the current local Git clone at a certain commit to a
different directory I.e. something like "copy at a point in history".
I think using
git archive "$commit" --format=tar |
{ cd "$output_directory" && tar -xf -; }
is probably the simplest solution. If you don't want to rely on tar then
something like
GIT_DIR="$(git rev-parse --path-format=absolute --git-dir)" &&
GIT_COMMON_DIR="$(git rev-parse --path-format=absolute
--git-common-dir)" || exit
GIT_INDEX_FILE="$GIT_DIR/tmp-index-$$"
export GIT_DIR GIT_COMMON_DIR GIT_INDEX_FILE
unset GIT_WORK_TREE
mkdir "$output_directory" && cd "$output_directory" &&
git read-tree -u "$commit"
status=$?
rm "$GIT_INDEX_FILE"
exit $status
Which uses a temporary index file should work (note I haven't tested
it). You may want to add "--recurse-submodules" and/or
"--no-sparse-checkout" to the "git read-tree" commandline.
Best Wishes
Phillip
IMO all possible solutions are summarized in this thread
https://stackoverflow.com/questions/160608/do-a-git-export-like-svn-export
I describe some of them with my remarks:
- git checkout-index : works with HEAD only.
- git archive: influenced by export-ignore and export-subst
attributes, so may not produce exact copy of sources. (And needs tar).
- git worktree add -d : needs cleanup: git prune or git remove.
- git clone: Unfortunately, -b param cannot work with commit hash and
does not respect local worktree settings (e.g. autocrlf). So, a
solution may be a bit complicated: git clone -s -n . dest/path ; cp
.git/config dest/path/.git ; cd dest/path ; git co -q <commit-ish> ;
rm -rf .git
- git checkout: Unfortunately, modifies Git index, so some action to
revert index is necessary after: git --work-tree=/path/to/checkout/
checkout -f -q <tree-ish> -- ./
For me, the best solution is with git clone, because it does not
modify Git index nor any source working tree settings, so no cleanup
is necessary. But it's a bit complicated, though. It seems to me that
"git checkout" could do this better and simpler if it would have some
param to not modify the Git index. Is it possible to enhance git
checkout? Or is there any other simple solution not mentioned in the
SO thread?
Thank you
Ondra Medek
