blame: tighten command line parser
The command line parser of "git blame" is prepared to take an ancient odd argument order "blame <path> <rev>" in addition to the usual "blame [<rev>] <path>". It has at least two negative ramifications: - In order to tell these two apart, it checks if the last command line argument names a path in the working tree, using file_exists(). However, "blame <rev> <path>" is a request to explain each and every line in the contents of <path> stored in revision <rev> and does not need to have a working tree version of the file. A check with file_exists() is simply wrong. - To coerce that mistaken file_exists() check to work, the code calls setup_work_tree() before doing so, because the path it has is relative to the top-level of the project tree. However, "blame <rev> <path>" MUST be usable even in a bare repository, and there is no reason for letting setup_work_tree() complain and die with "This operation must be run in a work tree". To correct the former, switch to check if the last token is a revision (and if so, parse arguments using "blame <path> <rev>" rule). Correct the latter by getting rid of setup_work_tree() and file_exists() check--the only case the call to this function matters is when we are running "blame <path>" (i.e. no starting revision and asking to blame the working tree file at <path>, digging through the HEAD revision), but there is a call in setup_scoreboard() just before it calls fake_working_tree_commit(). Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -649,6 +649,15 @@ static int blame_move_callback(const struct option *option, const char *arg, int
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return 0;
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}
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static int is_a_rev(const char *name)
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{
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struct object_id oid;
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if (get_oid(name, &oid))
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return 0;
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return OBJ_NONE < sha1_object_info(oid.hash, NULL);
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}
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int cmd_blame(int argc, const char **argv, const char *prefix)
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{
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struct rev_info revs;
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@ -845,16 +854,15 @@ parse_done:
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} else {
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if (argc < 2)
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usage_with_options(blame_opt_usage, options);
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path = add_prefix(prefix, argv[argc - 1]);
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if (argc == 3 && !file_exists(path)) { /* (2b) */
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if (argc == 3 && is_a_rev(argv[argc - 1])) { /* (2b) */
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path = add_prefix(prefix, argv[1]);
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argv[1] = argv[2];
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} else { /* (2a) */
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if (argc == 2 && is_a_rev(argv[1]) && !get_git_work_tree())
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die("missing <path> to blame");
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path = add_prefix(prefix, argv[argc - 1]);
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}
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argv[argc - 1] = "--";
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setup_work_tree();
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if (!file_exists(path))
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die_errno("cannot stat path '%s'", path);
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}
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revs.disable_stdin = 1;
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