[PATCH v2 2/2] rebase: validate -C and --whitespace= parameters early

[Johannes Schindelin via GitGitGadget]

From: Johannes Schindelin <johannes.schinde...@gmx.de>

It is a good idea to error out early upon seeing, say, `-Cbad`, rather
than starting the rebase only to have the `--am` backend complain later.

Let's do this.

The only options accepting parameters which we pass through to `git am`
(which may, or may not, forward them to `git apply`) are `-C` and
`--whitespace`. The other options we pass through do not accept
parameters, so we do not have to validate them here.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 builtin/rebase.c          | 12 +++++++++++-
 t/t3406-rebase-message.sh |  7 +++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/builtin/rebase.c b/builtin/rebase.c
index 96ffa80b71..571cf899d5 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -1064,12 +1064,22 @@ int cmd_rebase(int argc, const char **argv, const char 
*prefix)
        }
 
        for (i = 0; i < options.git_am_opts.argc; i++) {
-               const char *option = options.git_am_opts.argv[i];
+               const char *option = options.git_am_opts.argv[i], *p;
                if (!strcmp(option, "--committer-date-is-author-date") ||
                    !strcmp(option, "--ignore-date") ||
                    !strcmp(option, "--whitespace=fix") ||
                    !strcmp(option, "--whitespace=strip"))
                        options.flags |= REBASE_FORCE;
+               else if (skip_prefix(option, "-C", &p)) {
+                       while (*p)
+                               if (!isdigit(*(p++)))
+                                       die(_("switch `C' expects a "
+                                             "numerical value"));
+               } else if (skip_prefix(option, "--whitespace=", &p)) {
+                       if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
+                           strcmp(p, "error") && strcmp(p, "error-all"))
+                               die("Invalid whitespace option: '%s'", p);
+               }
        }
 
        if (!(options.flags & REBASE_NO_QUIET))
diff --git a/t/t3406-rebase-message.sh b/t/t3406-rebase-message.sh
index 0392e36d23..2c79eed4fe 100755
--- a/t/t3406-rebase-message.sh
+++ b/t/t3406-rebase-message.sh
@@ -84,4 +84,11 @@ test_expect_success 'rebase --onto outputs the invalid ref' '
        test_i18ngrep "invalid-ref" err
 '
 
+test_expect_success 'error out early upon -C<n> or --whitespace=<bad>' '
+       test_must_fail git rebase -Cnot-a-number HEAD 2>err &&
+       test_i18ngrep "numerical value" err &&
+       test_must_fail git rebase --whitespace=bad HEAD 2>err &&
+       test_i18ngrep "Invalid whitespace option" err
+'
+
 test_done
-- 
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