Wrappers refers to a CVS feature which lets you control certain settings based on the name of the file which is being operated on. The settings are ‘-k’ for binary files, and ‘-m’ for nonmergeable text files.
The ‘-m’ option
specifies the merge methodology that should be used when
a non-binary file is updated.
MERGE means the usual
CVS behavior: try to merge the files.
cvs update will refuse to merge
files, as it also does for files specified as binary
with ‘-kb’ (but if the file is specified as
binary, there is no need to specify ‘-m 'COPY'’).
CVS will provide the user with the
two versions of the files, and require the user using
mechanisms outside CVS, to insert any necessary
WARNING: Do not use
CVS 1.9 or earlier - such versions of CVS will
copy one version of your file over the other, wiping
out the previous contents.
The ‘-m’ wrapper option only affects behavior when
merging is done on update; it does not affect how files
are stored. See Binary files, for more on
The basic format of the file cvswrappers is:
wildcard [option value][option value]... where option is one of -m update methodology value: MERGE or COPY -k keyword expansion value: expansion mode and value is a single-quote delimited value.
For example, the following command imports a directory, treating files whose name ends in ‘.exe’ as binary:
cvs import -I ! -W "*.exe -k 'b'" first-dir vendortag reltag