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git-diff: allow --no-index semantics a bit more
Even when inside a git work tree, if two paths are given and at least one is clearly outside the work tree, it cannot be a request to diff a tracked path anyway; allow such an invocation to use --no-index semantics. Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -144,6 +144,25 @@ static int queue_diff(struct diff_options *o,
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}
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}
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static int path_outside_repo(const char *path)
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{
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/*
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* We have already done setup_git_directory_gently() so we
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* know we are inside a git work tree already.
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*/
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const char *work_tree;
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size_t len;
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if (!is_absolute_path(path))
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return 0;
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work_tree = get_git_work_tree();
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len = strlen(work_tree);
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if (strncmp(path, work_tree, len) ||
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(path[len] != '\0' && path[len] != '/'))
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return 1;
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return 0;
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}
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void diff_no_index(struct rev_info *revs,
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int argc, const char **argv,
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int nongit, const char *prefix)
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@ -162,13 +181,19 @@ void diff_no_index(struct rev_info *revs,
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break;
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}
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if (!no_index && !nongit) {
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/*
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* No explicit --no-index, but "git diff --opts A B" outside
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* a git repository is a cute hack to support.
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* Inside a git repository, without --no-index. Only
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* when a path outside the repository is given,
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* e.g. "git diff /var/tmp/[12]", or "git diff
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* Makefile /var/tmp/Makefile", allow it to be used as
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* a colourful "diff" replacement.
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*/
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if (!no_index && !nongit)
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if ((argc != i + 2) ||
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(!path_outside_repo(argv[i]) &&
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!path_outside_repo(argv[i+1])))
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return;
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}
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if (argc != i + 2)
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die("git diff %s takes two paths",
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no_index ? "--no-index" : "[--no-index]");
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