Copyright (c) 1998
Perry E. Metzger. All rights reserved.
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$FreeBSD: releng/10.2/sbin/rcorder/rcorder.8 233648 2012-03-29 05:02:12Z eadler $
.Dd August 5, 2011 .Dt RCORDER 8 .Os .Sh NAME .Nm rcorder .Nd print a dependency ordering of interdependent files .Sh SYNOPSIS .Nm .Op Fl k Ar keep .Op Fl s Ar skip .Ar .Sh DESCRIPTION The .Nm utility is designed to print out a dependency ordering of a set of interdependent files. Typically it is used to find an execution sequence for a set of shell scripts in which certain files must be executed before others.
p Each file passed to .Nm must be annotated with special lines (which look like comments to the shell) which indicate the dependencies the files have upon certain points in the sequence, known as .Dq conditions , and which indicate, for each file, which .Dq conditions may be expected to be filled by that file.
p
Within each file, a block containing a series of
.Dq Li REQUIRE ,
.Dq Li PROVIDE ,
.Dq Li BEFORE
and
.Dq Li KEYWORD
lines must appear.
The format of the lines is rigid.
Each line must begin with a single
.Ql # ,
followed by a single space, followed by
.Dq Li PROVIDE: ,
.Dq Li REQUIRE: ,
.Dq Li BEFORE: ,
or
.Dq Li KEYWORD: .
No deviation is permitted.
Each dependency line is then followed by a series of conditions,
separated by whitespace.
Multiple
.Dq Li PROVIDE ,
.Dq Li REQUIRE ,
.Dq Li BEFORE
and
.Dq Li KEYWORD
lines may appear, but all such lines must appear in a sequence without
any intervening lines, as once a line that does not follow the format
is reached, parsing stops.
Note that for historical reasons REQUIRES, PROVIDES, and KEYWORDS
are also accepted in addition to the above, but not documented so
that they can be deprecated at some point in the future.
p The options are as follows: l -tag -width indent t Fl k Add the specified keyword to the .Dq "keep list" . If any .Fl k option is given, only those files containing the matching keyword are listed. t Fl s Add the specified keyword to the .Dq "skip list" . If any .Fl s option is given, files containing the matching keyword are not listed. .El
p An example block follows: d -literal -offset indent # REQUIRE: networking syslog # REQUIRE: usr # PROVIDE: dns nscd .Ed
p This block states that the file in which it appears depends upon the .Dq Li networking , .Dq Li syslog , and .Dq Li usr conditions, and provides the .Dq Li dns and .Dq Li nscd conditions.
p A file may contain zero .Dq Li PROVIDE lines, in which case it provides no conditions, and may contain zero .Dq Li REQUIRE lines, in which case it has no dependencies. There must be at least one file with no dependencies in the set of arguments passed to .Nm in order for it to find a starting place in the dependency ordering. .Sh DIAGNOSTICS The .Nm utility may print one of the following error messages and exit with a non-zero status if it encounters an error while processing the file list. l -diag t "Requirement %s has no providers, aborting." No file has a .Dq Li PROVIDE line corresponding to a condition present in a .Dq Li REQUIRE line in another file. t "Circular dependency on provision %s, aborting." A set of files has a circular dependency which was detected while processing the stated condition. t "Circular dependency on file %s, aborting." A set of files has a circular dependency which was detected while processing the stated file. .El .Sh SEE ALSO .Xr rc 8 .Sh HISTORY The .Nm utility first appeared in .Nx 1.5 . .Sh AUTHORS .An -nosplit Written by .An Perry E. Metzger Aq perry@piermont.com and .An Matthew R. Green Aq mrg@eterna.com.au . .Sh BUGS The .Dq Li REQUIRE keyword is misleading: It doesn't describe which daemons have to be running before a script will be started. It describes which scripts must be placed before it in the dependency ordering. For example, if your script has a .Dq Li REQUIRE on .Dq Li named , it means the script must be placed after the .Dq Li named script in the dependency ordering, not necessarily that it requires .Xr named 8 to be started or enabled.