[Bug-tar] extend --exclude-vcs to exclude files from Mercurial et al

[Dan]

Hello,

The --exclude-vcs flag excludes version control files from systems such
as CVS, Subversion, and git; it would be very useful if the flag also
excluded files from Mercurial, Darcs, and Bazaar. Those three are
popular VCS's and Bazaar is now a GNU project.

The patch below adds this support:

[snip]
--- tar.c   2008-04-14 21:03:13.000000000 +0900
+++ tar-more-vcss.c 2008-06-12 22:32:33.000000000 +0900
@@ -849,6 +849,16 @@
     "=RELEASE-ID",
     "=meta-update",
     "=update",
+    /* Bazaar */
+    ".bzr",
+    ".bzrignore",
+    ".bzrtags",
+    /* Mercurial */
+    ".hg",
+    ".hgignore",
+    ".hgtags",
+    /* darcs */
+    "_darcs",
     NULL
   };
[snip]

I'm not sure that the above patterns would exclude all the files used by
those systems, but they would certainly eliminate a lot of cruft.

Thanks,

Dan Drake

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