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 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 HGFS(4) HGFS(4) 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 HISTORY Hgfs first appeared in 9front (June, 2011).