Running `git fetch --unshallow` on a repo that is not in fact shallow
produces a fatal error message. Add a helper to rev-parse that scripters
can use to determine whether a repo is shallow or not.

Signed-off-by: Øystein Walle <oys...@gmail.com>
---
 Documentation/git-rev-parse.txt |  3 +++
 builtin/rev-parse.c             |  5 +++++
 t/t1500-rev-parse.sh            | 15 +++++++++++++++
 3 files changed, 23 insertions(+)

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index b1293f24b..0917b8207 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -235,6 +235,9 @@ print a message to stderr and exit with nonzero status.
 --is-bare-repository::
        When the repository is bare print "true", otherwise "false".
 
+--is-shallow-repository::
+       When the repository is shallow print "true", otherwise "false".
+
 --resolve-git-dir <path>::
        Check if <path> is a valid repository or a gitfile that
        points at a valid repository, and print the location of the
diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 2bd28d3c0..c923207f2 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -868,6 +868,11 @@ int cmd_rev_parse(int argc, const char **argv, const char 
*prefix)
                                                : "false");
                                continue;
                        }
+                       if (!strcmp(arg, "--is-shallow-repository")) {
+                               printf("%s\n", is_repository_shallow() ? "true"
+                                               : "false");
+                               continue;
+                       }
                        if (!strcmp(arg, "--shared-index-path")) {
                                if (read_cache() < 0)
                                        die(_("Could not read the index"));
diff --git a/t/t1500-rev-parse.sh b/t/t1500-rev-parse.sh
index 03d3c7f6d..9d3433a30 100755
--- a/t/t1500-rev-parse.sh
+++ b/t/t1500-rev-parse.sh
@@ -116,6 +116,21 @@ test_expect_success 'git-path inside sub-dir' '
        test_cmp expect actual
 '
 
+test_expect_success 'git-path shallow repository' '
+       test_commit test_commit &&
+       echo true >expect &&
+       git clone --depth 1 --no-local . shallow &&
+       test_when_finished "rm -rf shallow" &&
+       git -C shallow rev-parse --is-shallow-repository >actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'git-path notshallow repository' '
+       echo false >expect &&
+       git rev-parse --is-shallow-repository >actual &&
+       test_cmp expect actual
+'
+
 test_expect_success 'showing the superproject correctly' '
        git rev-parse --show-superproject-working-tree >out &&
        test_must_be_empty out &&
-- 
2.11.0.485.g4e59582

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