yadm.1

." vim: set spell so=8:
.TH yadm 1 "08 January 2016" "1.03"
.SH NAME
yadm \- Yet Another Dotfiles Manager
.SH SYNOPSIS
.B yadm
.I command
.RI [ options ]

.B yadm
.I git-command-or-alias
.RI [ options ]

.B yadm
init
.RB [ -f ]
.RB [ -w
.IR directory ]

.B yadm
.RI clone " url
.RB [ -f ]
.RB [ -w
.IR directory ]

.B yadm
.RI config " name
.RI [ value ]

.B yadm
config
.RB [ -e ]

.B yadm
list
.RB [ -a ]

.BR yadm " encrypt

.BR yadm " decrypt
.RB [ -l ]

.BR yadm " alt

.BR yadm " perms
.SH DESCRIPTION
.B yadm
is a tool for managing a collection of files across multiple computers,
using a shared Git repository.
In addition,
.B yadm
provides a feature to select alternate versions of files
based on the operation system or host name.
Lastly,
.B yadm
supplies the ability to manage a subset of secure files, which are
encrypted before they are included in the repository.
.SH COMMANDS
.TP
.IR git-command " or " git-alias
Any command not internally handled by
.B yadm
is passed through to
.BR git (1).
Git commands or aliases are invoked with the
.B yadm
managed repository.
The working directory for git commands will be the configured
.IR work-tree " (usually
.IR $HOME ).

Dotfiles are managed by using standard
.B git
commands;
.IR add ,
.IR commit ,
.IR push ,
.IR pull ,
etc.

.RI The " config
command is not passed directly through.
Instead use the
.I gitconfig
command (see below).
.TP
.B alt
Create symbolic links for any managed files matching the naming rules describe in the ALTERNATES section.
It is usually unnecessary to run this command, as
.B yadm
automatically processes alternates by default.
This automatic behavior can be disabled by setting the configuration
.I yadm.auto-alt
to "false".
.TP
.BI clone " url
Clone a remote repository for tracking dotfiles.
After the contents of the remote repository have been fetched, a "merge" of
.I origin/master
is attempted.
If there are conflicting files already present in the
.IR work-tree ,
this merge will fail and instead a "reset" of
.I origin/master
will be done.
It is up to the user to resolve these conflicts,
but if the desired action is to have the contents in the repository overwrite the existing files,
then a "hard reset" should accomplish that:

.RS
.RS
yadm reset --hard origin/master
.RE
.RE
.IP
The repository is stored in
.IR $HOME/.yadm/repo.git .
By default,
.I $HOME
will be used as the
.IR work-tree ,
but this can be overridden with the
.BR -w " option.
.B yadm
can be forced to overwrite an existing repository by providing the
.BR -f " option.
.TP
.B config
This command manages configurations for
.BR yadm .
This command works exactly they way
.BR git-config (1)
does.
See the CONFIGURATION section for more details.
.TP
.B decrypt
Decrypt all files stored in
.IR $HOME/.yadm/files.gpg .
Files decrypted will be relative to the configured
.IR work-tree " (usually
.IR $HOME ).
Using the
.B -l
option will list the files stored without extracting them.
.TP
.B encrypt
Encrypt all files matching the patterns found in
.IR $HOME/.yadm/encrypt .
See the ENCRYPTION section for more details.
.TP
.B gitconfig
Pass options to the
.B git config
command. Since
.B yadm
already uses the
.I config
command to manage its own configurations,
this command is provided as a way to change configurations of the repository managed by
.BR yadm .
One useful case might be to configure the repository so untracked files are shown in status commands.
.B yadm
initially configures its repository so that untracked files are not shown.
If you wish use the default git behavior (to show untracked files and directories), you can remove this configuration.

.RS
.RS
yadm gitconfig --unset status.showUntrackedFiles
.RE
.RE
.TP
.B help
Print a summary of
.BR yadm " commands.
.TP
.B init
Initialize a new, empty repository for tracking dotfiles.
The repository is stored in
.IR $HOME/.yadm/repo.git .
By default,
.I $HOME
will be used as the
.IR work-tree ,
but this can be overridden with the
.BR -w " option.
.B yadm
can be forced to overwrite an existing repository by providing the
.BR -f " option.
.TP
.B list
Print a list of files managed by
.BR yadm .
.RB The " -a
option will cause all managed files to be listed.
Otherwise, the list will only include files from the current directory or below.
.TP
.B perms
Update permissions as described in the PERMISSIONS section.
It is usually unnecessary to run this command, as
.B yadm
automatically processes permissions by default.
This automatic behavior can be disabled by setting the configuration
.I yadm.auto-perms
to "false".
.TP
.B version
Print the version of
.BR yadm .
.SH OPTIONS

.B yadm
supports a set of universal options that alter the paths it uses.
The default paths are documented in the FILES section.
Any path specified by these options must be fully qualified.
If you always want to override one or more of these paths, it may be useful to create an alias for the
.B yadm
command.
For example, the following alias could be used to override the repository directory.

.RS
alias yadm='yadm --yadm-repo /alternate/path/to/repo'
.RE

The following is the full list of universal options.
Each option should be followed by a fully qualified path.
.TP
.B -Y,--yadm-dir
Override the
.B yadm
directory.
.B yadm
stores its data relative to this directory.
.TP
.B --yadm-repo
Override the location of the
.B yadm
repository.
.TP
.B --yadm-config
Override the location of the
.B yadm
configuration file.
.TP
.B --yadm-encrypt
Override the location of the
.B yadm
encryption configuration.
.TP
.B --yadm-archive
Override the location of the
.B yadm
encrypted files archive.
.SH CONFIGURATION
.B yadm
uses a configuration file named
.IR $HOME/.yadm/config .
This file uses the same format as
.BR git-config (1).
Also, you can control the contents of the configuration file
via the
.B yadm config
command (which works exactly like
.BR git-config ).
For example, to disable alternates you can run the command:

.RS
yadm config yadm.auto-alt false
.RE

The following is the full list of supported configurations:
.TP
.B yadm.auto-alt
Disable the automatic linking described in the section ALTERNATES.
If disabled, you may still run
.B yadm alt
manually to create the alternate links.
This feature is enabled by default.
.TP
.B yadm.auto-perms
Disable the automatic permission changes described in the section PERMISSIONS.
If disabled, you may still run
.B yadm perms
manually to update permissions.
This feature is enabled by default.
.TP
.B yadm.ssh-perms
Disable the permission changes to
.IR $HOME/.ssh/* .
This feature is enabled by default.
.TP
.B yadm.gpg-perms
Disable the permission changes to
.IR $HOME/.gnupg/* .
This feature is enabled by default.
.TP
.B yadm.gpg-recipient
Asymmetrically encrypt files with a gpg public/private key pair.
Provide a key ID to encrypt against that public key.
If left blank or not provided, symmetric encryption is used instead.
This feature is disabled by deafult.
.SH ALTERNATES
When managing a set of files across different systems, it can be useful to have
an automated way of choosing an alternate version of a file for a different
operation system, host, or user.
.B yadm
implements a feature which will automatically create a symbolic link to
the appropriate version of a file, as long as you follow a specific naming
convention.
.B yadm
can detect files with names ending in:

.RS
.BR ## " or " ##OS " or " ##OS.HOSTNAME " or " ##OS.HOSTNAME.USER
.RE

If there are any files managed by
.BR yadm \'s
repository which match this naming convention,
symbolic links will be created for the most appropriate version.
This may best be demonstrated by example. Assume the following files are managed by
.BR yadm \'s
repository:

  - $HOME/path/example.txt##
  - $HOME/path/example.txt##Darwin
  - $HOME/path/example.txt##Darwin.host1
  - $HOME/path/example.txt##Darwin.host2
  - $HOME/path/example.txt##Linux
  - $HOME/path/example.txt##Linux.host1
  - $HOME/path/example.txt##Linux.host2

If running on a Macbook named "host2",
.B yadm
will create a symbolic link which looks like this:

.IR $HOME/path/example.txt " -> " $HOME/path/example.txt##Darwin.host2

However, on another Mackbook named "host3",
.B yadm
will create a symbolic link which looks like this:

.IR $HOME/path/example.txt " -> " $HOME/path/example.txt##Darwin

Since the hostname doesn't match any of the managed files, the more generic version is chosen.

If running on a Linux server named "host4", the link will be:

.IR $HOME/path/example.txt " -> " $HOME/path/example.txt##Linux

If running on a Solaris server, the link use the default "##" version:

.IR $HOME/path/example.txt " -> " $HOME/path/example.txt##

If no "##" version exists and no files match the current OS/HOSTNAME/USER, then no link will be created.

OS is determined by running
.BR uname\ -s ,
HOSTNAME by running
.BR hostname\ -s ,
and USER by running
.BR id\ -u\ -n .
.B yadm
will automatically create these links by default. This can be disabled using the
.I yadm.auto-alt
configuration.
Even if disabled, links can be manually created by running
.BR yadm\ alt .
.SH ENCRYPTION
It can be useful to manage confidential files, like SSH or GPG keys, across
multiple systems. However, doing so would put plain text data into a Git
repository, which often resides on a public system.
.B yadm
implements a feature which can make it easy to encrypt and decrypt a set of
files so the encrypted version can be maintained in the Git repository.
This feature will only work if the
.BR gpg (1)
command is available.

To use this feature, a list of patterns must be created and saved as
.IR $HOME/.yadm/encrypt .
This list of patterns should be relative to the configured
.IR work-tree " (usually
.IR $HOME ).
For example:

.RS
    .ssh/*.key
    .gnupg/*.gpg
.RE

The
.B yadm encrypt
command will find all files matching the patterns, and prompt for a password. Once a
password has confirmed, the matching files will be encrypted and saved as
.IR $HOME/.yadm/files.gpg .
The patterns and files.gpg should be added to the
.B yadm
repository so they are available across multiple systems.

To decrypt these files later, or on another system run
.BR yadm\ decrypt
and provide the correct password.
After files are decrypted, permissions are automatically updated as described
in the PERMISSIONS section.

.BR NOTE :
It is recommended that you use a private repository when keeping confidential
files, even though they are encrypted.
.SH PERMISSIONS
When files are checked out of a Git repository, their initial permissions are
dependent upon the user's umask. This can result in confidential files with lax permissions.

To prevent this,
.B yadm
will automatically update the permissions of confidential files.
The "group" and "others" permissions will be removed from the following files:

.RI - " $HOME/.yadm/files.gpg

- All files matching patterns in
.I $HOME/.yadm/encrypt

- The SSH directory and files,
.I .ssh/*

- The GPG directory and files,
.I .gnupg/*

.B yadm
will automatically update permissions by default. This can be disabled using the
.I yadm.auto-perms
configuration.
Even if disabled, permissions can be manually updated by running
.BR yadm\ perms .
The SSH directory processing can be disabled using the
.I yadm.ssh-perms
configuration.
.SH FILES
The following are the default paths
.B yadm
uses for its own data.
These paths can be altered using universal options.
See the OPTIONS section for details.
.TP
.I $HOME/.yadm
The
.B yadm
directory. By default, all data
.B yadm
stores is relative to this directory.
.TP
.I $YADM_DIR/config
Configuration file for
.BR yadm .
.TP
.I $YADM_DIR/repo.git
Git repository used by
.BR yadm .
.TP
.I $YADM_DIR/encrypt
List of globs used for encrypt/decrypt
.TP
.I $YADM_DIR/files.gpg
All files encrypted with
.B yadm encrypt
are stored in this file.
.SH EXAMPLES
.TP
.B yadm init
Create an empty repo for managing files
.TP
.B yadm add .bash_profile ; yadm commit
Add
.I .bash_profile
to the Git index and create a new commit
.TP
.B yadm remote add origin <url>
Add a remote origin to an existing repository
.TP
.B yadm push -u origin master
Initial push of master to origin
.TP
.B echo ".ssh/*.key" >> $HOME/.yadm/encrypt
Add a new pattern to the list of encrypted files
.TP
.B yadm encrypt ; yadm add ~/.yadm/files.gpg ; yadm commit
Commit a new set of encrypted files
.SH REPORTING BUGS
Report issues or create pull requests at GitHub:

https://github.com/TheLocehiliosan/yadm
.SH AUTHOR
Tim Byrne <sultan@locehilios.com>
.SH SEE ALSO

.BR git (1),
.BR gpg (1)

Other management tools which inspired the creation of
.BR yadm :

.BR homeshick " <https://github.com/andsens/homeshick>

.BR vcsh " <https://github.com/RichiH/vcsh>