# Further options for FSVS. [Documentation for users]

List of settings that modify FSVS' behaviour. More...

List of settings that modify FSVS' behaviour.

FSVS understands some options that modify its behaviour in various small ways.

## Overview

### This document

This document lists all available options in FSVS, in an full listing and in groups.

Furthermore you can see their relative priorities and some examples.

### Sorted list of options

FSVS currently knows:

### Priorities for option setting

The priorities are
• Command line (highest)
• Environment variables. These are named as FSVS_{upper-case option name}.
• $HOME/.fsvs/wc-dir/config • $FSVS_CONF/wc-dir/config
• $HOME/.fsvs/config • $FSVS_CONF/config
• Default value, compiled in (lowest)

Note:
The $HOME-dependent configuration files are not implemented currently. Volunteers? Furthermore there are "intelligent" run-time dependent settings, like turning off colour output when the output is redirected. Their priority is just below the command line - so they can always be overridden if necessary. ### Examples Using the commandline:  fsvs -o path=environment fsvs -opath=environment  Using environment variables:  FSVS_PATH=absolute fsvs st  A configuration file, from $FSVS_CONF/config or in a WC-specific path below $FSVS_CONF:  # FSVS configuration file path=wcroot  ## Output settings and entry filtering ### Trimming the list of deleted entries If you remove a directory, all entries below are implicitly known to be deleted, too. To make the status output shorter there's the all_removed option which, if set to no, will cause children of removed entries to be omitted. Example for the config file:  all_removed=no  ### Directory sorting If you'd like to have the output of status sorted, you can use the option dir_sort=yes. FSVS will do a run through the tree, to read the status of the entries, and then go through it again, but sorted by name. (See dir_enumerator().) Note: If FSVS aborts with an error during status output, you might want to turn this option off again, to see where FSVS stops; the easiest way is on the command line with -odir_sort=no. ### Filtering entries Please see the command line parameter for -f, which is identical.  fsvs -o filter=mtime  ### "fsvs log" revision limit There are some defaults for the number of revisions that are shown on a "fsvs log" command: • 2 revisions given (-rX:Y): abs(X-Y)+1, ie. all revisions in that range. • 1 revision given: exactly that one. • no revisions given: from HEAD to 1, with a maximum of 100. So this command is mostly useful when running without revision arguments. ### "fsvs log" output format You can modify aspects of the fsvs log output format by setting the log_output option to a combination of these flags: • color: This uses color in the output, similar to cg-log (cogito-log); the header and separator lines are highlighted. Note: This uses ANSI escape sequences, and tries to restore the default color; if you know how to do that better (and more compatible), please tell the developer mailing list. • indent: Additionally you can shift the log message itself a space to the right, to make the borders clearer. Furthermore the value normal is available; this turns off all special handling. Note: If you start such an option, the value is reset; so if you specify log_output=color,indent in the global config file, and use log_output=color on the commandline, only colors are used. This is different to the Filtering entries option, which is cumulating. ### Displaying paths You can specify how paths printed by FSVS should look like; this is used for the entry status output of the various actions, and for the diff header lines. There are several possible settings, of which one can be chosen via the path option. • wcroot This is the old, traditional FSVS setting, where all paths are printed relative to the working copy root. • parameter With this setting FSVS works like most other programs - it uses the first best-matching parameter given by the user, and appends the rest of the path. This is the new default. Note: Internally FSVS still first parses all arguments, and then does a single run through the entries. So if some entry matches more than one parameter, it is printed using the first. • absolute All paths are printed in absolute form. This is useful if you want to paste them into other consoles without worrying whether the current directory matches. The next two are nearly identical to absolute, but the beginning of paths are substituted by environment variables. This makes sense if you want the advantage of full paths, but have some of them abbreviated. • environment Match variables to directories after reading the known entries, and use this cached information. This is faster, but might miss the best case if new entries are found (which would not be checked against possible longer hits). Furthermore, as this works via associating environment variables to entries, the environment variables must at least match the working copy base - shorter paths won't be substituted. • full-environment Check for matches just before printing the path. This is slower, but find the best fit. Note: The string of the environment variables must match a directory name; the filename is always printed literally, and partial string matches are not allowed. Feedback wanted. Only environment variables whose names start with WC are used for substitution, to avoid using variables like $PWD, $OLDPWD, $HOME and similar which might differ between sessions. Maybe the allowed prefixes for the environment variables should be settable in the configuration. Opinions to the users mailing list, please.

Example, with / as working copy base:

$cd /etc$ fsvs -o path=wcroot st
.mC.     1001  ./etc/X11/xorg.conf

$fsvs -o path=absolute st .mC. 1001 /etc/X11/xorg.conf$ fsvs -o path=parameters st
.mC.     1001  X11/xorg.conf
$fsvs -o path=parameters st . .mC. 1001 ./X11/xorg.conf$ fsvs -o path=parameters st /
.mC.     1001  /etc/X11/xorg.conf
$fsvs -o path=parameters st X11 .mC. 1001 X11/xorg.conf$ fsvs -o path=parameters st ../dev/..
.mC.     1001  ../dev/../etc/X11/xorg.conf
$fsvs -o path=parameters st X11 ../etc .mC. 1001 X11/xorg.conf$ fsvs -o path=parameters st ../etc X11
.mC.     1001  ../etc/X11/xorg.conf

$fsvs -o path=environ st .mC. 1001 ./etc/X11/xorg.conf$ WCBAR=/etc fsvs -o path=wcroot st
.mC.     1001  $WCBAR/X11/xorg.conf$ WCBAR=/etc fsvs -o path=wcroot st /
.mC.     1001  $WCBAR/X11/xorg.conf$ WCBAR=/e fsvs -o path=wcroot st
.mC.     1001  /etc/X11/xorg.conf
$WCBAR=/etc WCFOO=/etc/X11 fsvs -o path=wcroot st .mC. 1001$WCFOO/xorg.conf

$touch /etc/X11/xinit/xinitrc$ fsvs -o path=parameters st
.mC.     1001  X11/xorg.conf
.m.?     1001  X11/xinit/xinitrc


## Options for commit

### Author

You can specify an author to be used on commit. This option has a special behaviour; if the first character of the value is an '$', the value is replaced by the environment variable named. Empty strings are ignored; that allows an /etc/fsvs/config like this:  author=unknown author=$LOGNAME
author=$SUDO_USER  where the last non-empty value is taken; and if your .authorized_keys has lines like  environment="FSVS_AUTHOR=some_user" ssh-rsa ...  that would override the config values. Note: Your sshd_config needs the PermitUserEnvironment setting; you can also take a look at the AcceptEnv and SendEnv documentation. ### Destination URL for commit If you defined multiple URLs for your working copy, FSVS needs to know which URL to commit to. For this you would set commit_to to the name of the URL; see this example:  fsvs urls N:master,P:10,http://... N:local,P:20,file:///... fsvs ci /etc/passwd -m "New user defined" -ocommit_to=local  ### Doing empty commits In the default settings FSVS will happily create empty commits, ie. revisions without any changed entry. These just have a revision number, an author and a timestamp; this is nice if FSVS is run via CRON, and you want to see when FSVS gets run. If you would like to avoid such revisions, set this option to no; then such commits will be avoided. Example:  fsvs commit -o empty_commit=no -m "cron" /etc  ### Avoid commits without a commit message If you don't like the behaviour that FSVS does commits with an empty message received from $EDITOR (eg if you found out that you don't want to commit after all), you can change this option to no; then FSVS won't allow empty commit messages.

Example for the config file:

        empty_message=no


### Creating directories in the repository above the URL

If you want to keep some data versioned, the first commit is normally the creation of the base directories above the given URL (to keep that data separate from the other repository data).

Previously this had to be done manually, ie. with a svn mkdir $URL --parents or similar command. With the mkdir_base option you can tell FSVS to create directories as needed; this is mostly useful on the first commit.  fsvs urls ... fsvs group 'group:ignore,./**' fsvs ci -m "First post!" -o mkdir_base=yes  ### Waiting for a time change after working copy operations If you're using FSVS in automated systems, you might see that changes that happen in the same second as a commit are not seen with status later; this is because the timestamp granularity of FSVS is 1 second. For backward compatibility the default value is no (don't delay). You can set it to any combination of • commit, • update, • revert and/or • checkout; for yes all of these actions are delayed until the clock seconds change. Example how to set that option via an environment variable:  export FSVS_DELAY=commit,revert  ## Performance and tuning related options ### Change detection This options allows to specify the trade-off between speed and accuracy. A file with a changed size can immediately be known as changed; but if only the modification time is changed, this is not so easy. Per default FSVS does a MD5 check on the file in this case; if you don't want that, or if you want to do the checksum calculation for every file (in case a file has changed, but its mtime not), you can use this option to change FSVS' behaviour. On the command line there's a shortcut for that: for every "-C" another check in this option is chosen. The recognized specifications are  none Resets the check bitmask to "no checks". file_mtime Check files for modifications via MD5 if the mtime is different - default dir Check all directories for new entries - this happens normally if a directory ha allfiles Check all files with MD5 for changes (tripwire -like operation). full All available checks. You can give multiple options; they're accumulated unless overridden by none.  fsvs -o change_check=allfiles status  Note: commit and update set additionally the dir option, to avoid missing new files. ### Avoiding expensive compares on \ref cpfd "copyfrom-detect" If you've got big files that are seen as new, doing the MD5 comparison can be time consuming. So there's the option copyfrom_exp, which takes the usual yes (default) and no arguments.  fsvs copyfrom-detect -o copyfrom_exp=no some_directory  ### Getting grouping/ignore statistics If you need to ignore many entries of your working copy, you might find that the ignore pattern matching takes some valuable time. In order to optimize the order of your patterns you can specify this option to print the number of tests and matches for each pattern. $ fsvs status -o group_stats=yes -q

Grouping statistics (tested, matched, groupname, pattern):

4705  80   ignore   group:ignore,.


For optimizing you'll want to put often matching patterns at the front (to make them match sooner, and avoid unnecessary tests); but if you are using other groups than ignore (like take), you will have to take care to keep the patterns within a group together.

Please note that the first line shows how many entries were tested, and that the next lines differ by the number of matches entries for the current line, as all entries being tested against some pattern get tested for the next too, unless they match the current pattern.

This option is available for status and the ignore test commands.

## Base configuration

### Path definitions for the config and WAA area

The paths given here are used to store the persistent configuration data needed by FSVS; please see Files used by fsvs and Priorities for option setting for more details, and the Using an alternate root directory parameter as well as the Recovery for a non-booting system for further discussion.

    FSVS_CONF=/home/user/.fsvs-conf fsvs -o waa=/home/user/.fsvs-waa st


Note:
Please note that these paths can be given only as environment variables ($FSVS_CONF resp. $FSVS_WAA) or as command line parameter; settings in config files are ignored.

### Configuration directory for the subversion libraries

This path specifies where the subversion libraries should take their configuration data from; the most important aspect of that is authentication data, especially for certificate authentication.

The default value is $FSVS_CONF/auth/. /etc/fsvs/config could have eg.  config_dir=/root/.subversion  ### Using an alternate root directory This is a path that is prepended to $FSVS_WAA and $FSVS_CONF (or their default values, see Files used by fsvs), if they do not already start with it, and it is cut off for the directory-name MD5 calculation. When is that needed? Imagine that you've booted from some Live-CD like Knoppix; if you want to setup or restore a non-working system, you'd have to transfer all files needed by the FSVS binary to it, and then start in some kind of chroot environment. With this parameter you can tell FSVS that it should load its libraries from the current filesystem, but use the given path as root directory for its administrative data. This is used for recovery; see the example in Recovery for a non-booting system. So how does this work? • The internal data paths derived from $FSVS_WAA and $FSVS_CONF use the value given for softroot as a base directory, if they do not already start with it. (If that creates a conflict for you, eg. in that you want to use /var as the softroot, and your $FSVS_WAA should be /var/fsvs, you can make the string comparison fail by using /./var for either path.)

• When a directory name for $FSVS_CONF or $FSVS_WAA is derived from some file path, the part matching softroot is cut off, so that the generated names match the situation after rebooting.

Previously you'd have to export your data back to the filesystem and call urls "fsvs urls" and FSVS sync-repos again, to get the WAA data back.

Note:
A plain chroot() would not work, as some needed programs (eg. the decoder for update, see Special property names) would not be available.

The easy way to understand softroot is: If you want to do a chroot() into the given directory (or boot with it as /), you'll want this set.

As this value is used for finding the correct working copy root (by trying to find a conf-path, it cannot be set from a per-wc config file. Only the environment, global configuration or command line parameter make sense.

## Debugging and diagnosing

The next two options could be set in the global configuration file, to automatically get the last debug messages when an error happens.

To provide an easy way to get on-line debugging again, debug_output and debug_buffer are both reset to non-redirected, on-line output, if more than a single -d is specified on the command line, like this:

fsvs commit -m "..."  -d -d filenames


In this case you'll get a message telling you about that.

### Destination for debug output

You can specify the debug output destination with the option debug_output. This can be a simple filename (which gets truncated on open), or, if it starts with a |, a command that the output gets piped into.

If the destination cannot be opened (or none is given), debug output goes to STDOUT (for easier tracing via less).

Example:

fsvs -o debug_output=/tmp/debug.out -d st /etc


Note:
That string is taken only once - at the first debug output line. So you have to use the correct order of parameters: -o debug_output=... -d.
An example: writing the last 200 lines of debug output into a file.
fsvs -o debug_output='| tail -200 > /tmp/debug.log' -d ....


### Using a debug buffer

With the debug_buffer option you can specify the size of a buffer (in kB) that is used to capture the output, and which gets printed automatically if an error occurs.

This must be done before debugging starts, like with the debug_output specification.

fsvs -o debug_buffer=128 ...


Note:
If this option is specified in the configuration file or via the environment, only the buffer is allocated; if it is used on the command line, debugging is automatically turned on, too.

### Setting warning behaviour

Please see the command line parameter -W, which is identical.

    fsvs -o warning=diff-status=ignore


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