HGFS(4) HGFS(4)
NAME
hgfs - mercurial file system
SYNOPSIS
hgfs [ -D ] [ -m mtpt ] [ -s service ] [ dir ]
DESCRIPTION
Mercurial is a distributed version control system. It tracks
and organizes files and keeps a change history of them. The
file revisions are stored as packed deltas in a repository
that can be checked out with the hg(1) program.
Hgfs serves a mercurial repository as a read-only filesystem
where each file revision and its metadata is accessible as
files.
The repository may be specified by passing the working
directory dir as the final argument. When omitted, hgfs
locates the repository by walking upwards from the current
working directory until the .hg sub-directory is found. If
no mtpt was specified with -m , then hgfs will mount itself
on /mnt/hg (default). When a service name is given with the
-s flag, the 9p service pipe /srv/service is created and may
be mounted from another namespace. The -D flag enables 9p
debug messages.
The root of the served filesystem contains directories each
corresponding to a specific changeset revision in the repos-
itory.
Revision directories are named by a revision id which takes
the form [d.]h, where d is the decimal revision number
starting from 0 and h is the hexadecimal hash of the change-
set. Both the revision number d and the hash h are able to
identify a revision uniquely; only one of them needs to be
given when walking the root directory. The hexadecimal hash
may be shortened so long as the resulting lookup yields a
unique result. The special name tip corresponds to the lat-
est revision but does not appear in the directory listing.
In each revision directory the following files can be found:
rev contains the revision id of the changeset.
rev1 contains the parent revision id of the changeset.
rev2 If the changeset was a merge, contains the other parent
revision id. Otherwise, a zero size file.
log The log file contains a list of file names, separated
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by a newline, that where affected in this changeset.
Files that are listed in the log but are not accessible
in the files or changes directories have been deleted
in this changeset.
who committer of the changeset.
why commit message of the changeset.
files
A directory that contains a snapshot of the tree at the
time the changeset was committed.
To retrieve the nth past version of a file relative to
the changeset, one can append .n to the filename.
Appending .revn yields a file that contains its revi-
sion id as text. Note that appending .rev0 or .rev
yields the file containing the revision id of the
changeset when the file was last modified and .0 yields
the same file as when omitting the appendix.
changes
Same as files, but contains only the changed files of
the changeset.
SOURCE
/sys/src/cmd/hgfs
SEE ALSO
hg(1)
HISTORY
Hgfs first appeared in 9front (June, 2011).
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