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authorLibravatar Taylor Blau <me@ttaylorr.com>2021-08-31 16:51:53 -0400
committerLibravatar Junio C Hamano <gitster@pobox.com>2021-09-01 10:58:43 -0700
commit73ff4ad086d1a205194e23344bb86ee3b3da0674 (patch)
tree725be81a808c023f6398bbdc50cd477cbcf92e76 /t/t2102-update-index-symlinks.sh
parentDocumentation: describe MIDX-based bitmaps (diff)
downloadtgif-73ff4ad086d1a205194e23344bb86ee3b3da0674.tar.xz
midx: disallow running outside of a repository
The multi-pack-index command supports working with arbitrary object directories via the `--object-dir` flag. Though this has historically worked in arbitrary repositories (including when the command itself was run outside of a Git repository), this has been somewhat of an accident. For example, running: git multi-pack-index write --object-dir=/path/to/repo/objects outside of a Git repository causes a BUG(). This is because the top-level `cmd_multi_pack_index()` function stops parsing when it sees "write", and then fills in the default object directory (the result of calling `get_object_directory()`) before handing off to `cmd_multi_pack_index_write()`. But there is no repository to initialize, and so calling `get_object_directory()` results in a BUG() (indicating that the current repository is not initialized). Another case where this doesn't quite work as expected is when operating in a SHA-256 repository. To see the failure, try this in your shell: git init --object-format=sha256 repo git -C repo commit --allow-empty base git -C repo repack -d git multi-pack-index --object-dir=$(pwd)/repo/.git/objects write and observe that we cannot open the `.idx` file in "repo", because the outermost process assumes that any repository that it works in also uses the default value of `the_hash_algo` (at the time of writing, SHA-1). There may be compelling reasons for trying to work around these bugs, but working in arbitrary `--object-dir`'s is non-standard enough (and likewise, these bugs prevalent enough) that I don't think any workflows would be broken by abandoning this behavior. Accordingly, restrict the `multi-pack-index` builtin to only work when inside of a Git repository (i.e., its main utility becomes selecting which alternate to operate in), which avoids both of the bugs above. (Note that you can still trigger a bug when writing a MIDX in an alternate which does not use the same object format as the repository which it is an alternate of, but that is an unrelated bug to this one). Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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