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-rw-r--r--builtin/blame.c2
-rwxr-xr-xt/t8002-blame.sh4
2 files changed, 6 insertions, 0 deletions
diff --git a/builtin/blame.c b/builtin/blame.c
index cbb7dc2ad9..1fccbe6bff 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -2609,6 +2609,8 @@ parse_done:
if (0 < abbrev && abbrev < GIT_SHA1_HEXSZ)
/* one more abbrev length is needed for the boundary commit */
abbrev++;
+ else if (!abbrev)
+ abbrev = GIT_SHA1_HEXSZ;
if (revs_file && read_ancestry(revs_file))
die_errno("reading graft file '%s' failed", revs_file);
diff --git a/t/t8002-blame.sh b/t/t8002-blame.sh
index c6347ad8fd..380e1c1054 100755
--- a/t/t8002-blame.sh
+++ b/t/t8002-blame.sh
@@ -114,4 +114,8 @@ test_expect_success 'blame --abbrev=40 behaves like -l' '
check_abbrev 39 --abbrev=40 ^HEAD
'
+test_expect_success '--no-abbrev works like --abbrev=40' '
+ check_abbrev 40 --no-abbrev
+'
+
test_done