90 lines
3.4 KiB
Markdown
90 lines
3.4 KiB
Markdown
In the world of git, we're not scared about internal implementation
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details, and sometimes we like to dive in and tweak things by hand. Here's
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some documentation to that end.
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## `.git/annex/objects/aa/bb/*/*`
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This is where locally available file contents are actually stored.
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Files added to the annex get a symlink checked into git that points
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to the file content.
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First there are two levels of directories used for hashing, to prevent
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too many things ending up in any one directory.
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Each subdirectory has the name of a key in one of the
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[[key-value_backends|backends]]. The file inside also has the name of the key.
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This two-level structure is used because it allows the write bit to be removed
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from the subdirectories as well as from the files. That prevents accidentially
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deleting or changing the file contents.
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## The git-annex branch
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This branch is managed by git-annex, with the contents listed below.
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The file `.git/annex/index` is a separate git index file it uses
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to accumulate changes for the git-annex branch.
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Also, `.git/annex/journal/` is used to record changes before they
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are added to git.
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### `uuid.log`
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Records the UUIDs of known repositories, and associates them with a
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description of the repository. This allows git-annex to display something
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more useful than a UUID when it refers to a repository that does not have
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a configured git remote pointing at it.
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The file format is simply one line per repository, with the uuid followed by a
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space and then the description, followed by a timestamp. Example:
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e605dca6-446a-11e0-8b2a-002170d25c55 laptop timestamp=1317929189.157237s
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26339d22-446b-11e0-9101-002170d25c55 usb disk timestamp=1317929330.769997s
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If there are multiple lines for the same uuid, the one with the most recent
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timestamp wins. git-annex union merges this and other files.
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## `remotes.log`
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Holds persistent configuration settings for [[special_remotes]] such as
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Amazon S3.
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The file format is one line per remote, starting with the uuid of the
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remote, followed by a space, and then a series of key=value pairs,
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each separated by whitespace, and finally a timestamp.
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## `trust.log`
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Records the [[trust]] information for repositories. Does not exist unless
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[[trust]] values are configured.
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The file format is one line per repository, with the uuid followed by a
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space, and then either `1` (trusted), `0` (untrusted), `?` (semi-trusted),
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`X` (dead) and finally a timestamp.
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Example:
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e605dca6-446a-11e0-8b2a-002170d25c55 1 timestamp=1317929189.157237s
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26339d22-446b-11e0-9101-002170d25c55 ? timestamp=1317929330.769997s
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Repositories not listed are semi-trusted.
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## `aaa/bbb/*.log`
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These log files record [[location_tracking]] information
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for file contents. Again these are placed in two levels of subdirectories
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for hashing. The name of the key is the filename, and the content
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consists of a timestamp, either 1 (present) or 0 (not present), and
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the UUID of the repository that has or lacks the file content.
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Example:
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1287290776.765152s 1 e605dca6-446a-11e0-8b2a-002170d25c55
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1287290767.478634s 0 26339d22-446b-11e0-9101-002170d25c55
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These files are designed to be auto-merged using git's [[union merge driver|git-union-merge]].
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The timestamps allow the most recent information to be identified.
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## `aaa/bbb/*.log.web`
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These log files record urls used by the
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[[web_special_remote|special_remotes/web]]. Their format is similar
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to the location tracking files, but with urls rather than UUIDs.
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