Add dss.1 and dss.1.html to .gitignore.

[dss.git] / dss.ggo

diff --git a/dss.ggo b/dss.ggo
index 731cabb89485418f0326611e18176bca4a982f1e..7afa4ca94237c70b17563ce206d125372dfead7a 100644 (file)
--- a/dss.ggo
+++ b/dss.ggo
@@ -3,7 +3,7 @@
 # Licensed under the GPL v2. For licencing details see COPYING.
 
 package "dss"
 # Licensed under the GPL v2. For licencing details see COPYING.
 
 package "dss"

-version "0.0.5"
+version "0.1.0"

 purpose "the dyadic snapshot scheduler
 
 dss creates hardlink-based snapshots of a given directory on a remote
 purpose "the dyadic snapshot scheduler
 
 dss creates hardlink-based snapshots of a given directory on a remote


@@ -82,12 +82,17 @@ details="
        is also given.
 "
 
        is also given.
 "
 

+##################
+section "Commands"
+##################
+

 defgroup "command"
 #=================
 groupdesc="
        dss supports a couple of commands each of which corresponds
        to a different command line option. Exactly one of these
        options must be given.
 defgroup "command"
 #=================
 groupdesc="
        dss supports a couple of commands each of which corresponds
        to a different command line option. Exactly one of these
        options must be given.

+

 "
 required
 
 "
 required
 


@@ -102,13 +107,14 @@ details="
 
 groupoption "prune" P
 #~~~~~~~~~~~~~~~~~~~~
 
 groupoption "prune" P
 #~~~~~~~~~~~~~~~~~~~~

-"Remove a redundant snapshot"
+"Remove redundant and outdated snapshots"

 group="command"
 details="
 group="command"
 details="

-       A snapshot is considered redundant if it ether belongs to
-       an interval greater than the maximum number of intervals,
-       or if it belongs to an interval that already contains more
-       than the desired number of snapshots.
+       A snapshot is considered outdated if it belongs to an interval
+       greater than the maximum number of intervals. It is said to be
+       redundant if it belongs to an interval that already contains
+       more than the desired number of snapshots. This command gets
+       rid of such snapshots.

 "
 
 groupoption "ls" L
 "
 
 groupoption "ls" L


@@ -127,7 +133,9 @@ groupoption "run" R
 group="command"
 details="
        This is the main mode of operation. Snapshots will be created
 group="command"
 details="
        This is the main mode of operation. Snapshots will be created

-       as needed and pruned automatically.
+       in an endless loop as needed and pruned automatically. The loop
+       only terminates on fatal errors or if a terminating signal was
+       received. See also the --exit-hook option.

 "
 
 ###############################
 "
 
 ###############################


@@ -208,13 +216,14 @@ details="
        unit intervals.
 
        dss removes any snapshots older than n times u and tries to
        unit intervals.
 
        dss removes any snapshots older than n times u and tries to

-       keep 2^(k-1) snapshots in interval k, where the interval number
-       k counts from zero, zero being the most recent unit interval.
+       keep 2^(n - k - 1) snapshots in interval k, where the interval
+       number k counts from zero, zero being the most recent unit
+       interval.

 
        In other words, the oldest snapshot will at most be u * n days
        (= 20 days if default values are used) old.  Moreover, there
        are at most 2^n - 1 snapshots in total (i. e. 31 by default).
 
        In other words, the oldest snapshot will at most be u * n days
        (= 20 days if default values are used) old.  Moreover, there
        are at most 2^n - 1 snapshots in total (i. e. 31 by default).

-       Observe that you have to create at least 2 ^ (n - 1) snapshots
+       Observe that you have to create at least 2^(n - 1) snapshots

        each interval for this to work out because that is the number
        of snapshots in interval zero.
 "
        each interval for this to work out because that is the number
        of snapshots in interval zero.
 "


@@ -264,6 +273,22 @@ details="
        store them in a database for further analysis.
 "
 
        store them in a database for further analysis.
 "
 

+option "exit-hook" e
+#~~~~~~~~~~~~~~~~~~~
+"Executed if run command exits"
+string typestr="command"
+optional
+details="
+       This hook is only used if the --run command was given which
+       instructs dss to run in an endless loop. The exit-hook gets
+       executed whenever this endless loop terminates. The reason
+       for terminating the loop is passed as the first argument.
+
+       One possible application for this hook is to send email to the
+       system administrator to let her know that no more snapshots
+       are going to be created.
+"
+

 ###############################
 section "Disk space monitoring"
 ###############################
 ###############################
 section "Disk space monitoring"
 ###############################


@@ -316,3 +341,17 @@ details="
 
        A value of zero (the default) deactivates this check.
 "
 
        A value of zero (the default) deactivates this check.
 "

+
+option "keep-redundant" k
+#~~~~~~~~~~~~~~~~~~~~~~~~
+"Prune by disk space only"
+flag off
+details="
+       If this flag is not given dss removes redundant and outdated
+       snapshots automatically.
+
+       Otherwise, this feature is deactivated so that snapshots
+       are only being removed in case disk space or inode ratio
+       becomes low. Use this flag if the file system containing the
+       destination directory is used for snapshots only.
+"