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Teach read-tree the -n|--dry-run option

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The option can be used to check if read-tree with the same set of other
options like "-m" and "-u" would succeed without actually changing either
the index or the working tree.

The relevant tests in the t10?? range were extended to do a read-tree -n
before the real read-tree to make sure neither the index nor any local
files were changed with -n and the same exit code as without -n is
returned. The helper functions added for that purpose reside in the new
t/lib-read-tree.sh file.

The only exception is #13 in t1004 ("unlinking an un-unlink-able
symlink"). As this is an issue of wrong directory permissions it is not
detected with -n.

Signed-off-by: Jens Lehmann <Jens.Lehmann@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jens Lehmann
2011-05-25 22:10:41 +02:00
committed by Junio C Hamano
parent 2c9078d05b
commit ea5070c91f
12 changed files with 198 additions and 140 deletions
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3
builtin/read-tree.c
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@ -130,6 +130,7 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
PARSE_OPT_NONEG, exclude_per_directory_cb },
OPT_SET_INT('i', NULL, &opts.index_only,
"don't check the working tree after merging", 1),
OPT__DRY_RUN(&opts.dry_run, "don't update the index or the work tree"),
OPT_SET_INT(0, "no-sparse-checkout", &opts.skip_sparse_checkout,
"skip applying sparse checkout filter", 1),
OPT_SET_INT(0, "debug-unpack", &opts.debug_unpack,
@ -219,7 +220,7 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
if (unpack_trees(nr_trees, t, &opts))
return 128;
if (opts.debug_unpack)
if (opts.debug_unpack || opts.dry_run)
return 0; /* do not write the index out */
/*