[PATCH v2 0/3] checkout: fix two bugs on count of updated entries

Changed since v1: small simplification at test t2080, to use test_oid_to_path and test_stdout_line_count.

v1 cover letter:

This fixes two issues at the "Updated %d path from the index" report at the end of a `git checkout <paths>` operation:

  - Delayed checkout entries being counted twice.
  - Failed entries being included in the count.

The first two patches add tests and the third implements the fix. I came across this while working at parallel checkout, but only managed to get back to it now.

Matheus Tavares (3):
  checkout: document bug where delayed checkout counts entries twice
  checkout: show bug about failed entries being included in final report
  checkout: fix two bugs on the final count of updated entries

 builtin/checkout.c                  |  2 +-
 convert.h                           |  6 +++-
 entry.c                             | 34 +++++++++++---------
 entry.h                             |  3 +-
 parallel-checkout.c                 | 10 ++++--
 parallel-checkout.h                 |  4 ++-
 t/lib-parallel-checkout.sh          |  6 +++-
 t/t0021-conversion.sh               | 22 +++++++++++++
 t/t2080-parallel-checkout-basics.sh | 48 +++++++++++++++++++++++++++++
 unpack-trees.c                      |  2 +-
 10 files changed, 113 insertions(+), 24 deletions(-)

Range-diff against v1:
1:  694aeb19f5 = 1:  694aeb19f5 checkout: document bug where delayed checkout counts entries twice
2:  8da18a0a8c ! 2:  4541e90224 checkout: show bug about failed entries being included in final report
    @@ t/t2080-parallel-checkout-basics.sh: test_expect_success SYMLINKS 'parallel chec
     +		git commit -m files &&
     +
     +		a_blob="$(git rev-parse :parallel-ineligible.a)" &&
    -+		dir="$(echo "$a_blob" | cut -c 1-2)" &&
    -+		file="$(echo "$a_blob" | cut -c 3-)" &&
    -+		rm ".git/objects/$dir/$file" &&
    ++		rm .git/objects/$(test_oid_to_path $a_blob) &&
     +		rm *.a *.b &&
     +
     +		test_checkout_workers 2 test_must_fail git checkout . 2>err &&
    @@ t/t2080-parallel-checkout-basics.sh: test_expect_success SYMLINKS 'parallel chec
     +		#  - parallel-*.a: the blob will be missing
     +		#
     +		grep "Updated 3 paths from the index" err &&
    -+		test "$(ls *.b | wc -l)" -eq 3 &&
    -+		test "$(ls *.a | wc -l)" -eq 0
    ++		test_stdout_line_count = 3 ls *.b &&
    ++		! ls *.a
     +	)
     +'
     +
3:  5e9452be66 = 3:  b182d74e96 checkout: fix two bugs on the final count of updated entries