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57 строки
1.4 KiB
Plaintext
57 строки
1.4 KiB
Plaintext
https://en.wikibooks.org/wiki/Git/Internal_structure
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A commit is reachable if it is pointed to by a branch, tag or reflog entry,
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or is a parent of a commit which is reachable.
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A tree is correspondingly reachable if it is pointed to by a reachable commit,
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and a blob is reachable if it is pointed to by a reachable tree.
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Other commit/tree/blob objects are unreachable,
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and are not really serving any purpose beyond taking up space.
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Interesting:
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Types of git objects:
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blob (every file under source control is written into a blob)
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tree
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commit
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tag
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Tree object:
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- Header info
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For each file/dir in the directory:
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-- file permissions
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-- object type (blob/tree)
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-- sha-1
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-- file/dir name
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alias deflate="perl -MCompress::ZLib -e 'undef $/; print uncompress(<>)'"
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git cat-file -t <hash> get type
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-p <hash> print
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100644 blob <sha-1>1 .gitignore
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100644 blob <sha-1>2 README.markdown
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100644 blob <sha-1>2 TODO
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100644 blob <sha-1>2 fix.txt
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Commit (how git stores "snapshots") object:
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- Author info
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- Committer info
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- Commit message (subjects)
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- sha-1 of any parent commits (we can have multiple parents for branching/merging)
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- sha-1 of the tree that the commit points to
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???
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git ls-tree
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References:
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- sha-1 hash
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- branches
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- HEAD
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- Ancestry Refs (HEAD~, HEAD~2, HEAD~3, HEAD^, HEAD^2)
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Branches:
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- reference to the latest commit on that specific branch
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HEAD alias - reference to the latest commit on the current branch
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