Instead of directly writing to and reading from files in
$GIT_DIR, use ref API to interact with CHERRY_PICK_HEAD
and REVERT_HEAD.

Signed-off-by: David Turner <dtur...@twopensource.com>
---
 branch.c                         |  4 ++--
 builtin/commit.c                 |  6 +++---
 builtin/merge.c                  |  2 +-
 contrib/completion/git-prompt.sh |  4 ++--
 git-gui/lib/commit.tcl           |  2 +-
 sequencer.c                      | 37 +++++++++++++++++++------------------
 t/t7509-commit.sh                |  4 ++--
 wt-status.c                      |  6 ++----
 8 files changed, 32 insertions(+), 33 deletions(-)

diff --git a/branch.c b/branch.c
index b002435..ec598aa 100644
--- a/branch.c
+++ b/branch.c
@@ -302,8 +302,8 @@ void create_branch(const char *head,
 
 void remove_branch_state(void)
 {
-       unlink(git_path("CHERRY_PICK_HEAD"));
-       unlink(git_path("REVERT_HEAD"));
+       delete_ref("CHERRY_PICK_HEAD", NULL, REF_NODEREF);
+       delete_ref("REVERT_HEAD", NULL, REF_NODEREF);
        unlink(git_path("MERGE_HEAD"));
        unlink(git_path("MERGE_RR"));
        unlink(git_path("MERGE_MSG"));
diff --git a/builtin/commit.c b/builtin/commit.c
index b5b1158..53c7e90 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -168,7 +168,7 @@ static void determine_whence(struct wt_status *s)
 {
        if (file_exists(git_path("MERGE_HEAD")))
                whence = FROM_MERGE;
-       else if (file_exists(git_path("CHERRY_PICK_HEAD"))) {
+       else if (ref_exists("CHERRY_PICK_HEAD")) {
                whence = FROM_CHERRY_PICK;
                if (file_exists(git_path(SEQ_DIR)))
                        sequencer_in_use = 1;
@@ -1777,8 +1777,8 @@ int cmd_commit(int argc, const char **argv, const char 
*prefix)
        }
        ref_transaction_free(transaction);
 
-       unlink(git_path("CHERRY_PICK_HEAD"));
-       unlink(git_path("REVERT_HEAD"));
+       delete_ref("CHERRY_PICK_HEAD", NULL, REF_NODEREF);
+       delete_ref("REVERT_HEAD", NULL, REF_NODEREF);
        unlink(git_path("MERGE_HEAD"));
        unlink(git_path("MERGE_MSG"));
        unlink(git_path("MERGE_MODE"));
diff --git a/builtin/merge.c b/builtin/merge.c
index 46aacd6..3e2ae2f 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1206,7 +1206,7 @@ int cmd_merge(int argc, const char **argv, const char 
*prefix)
                else
                        die(_("You have not concluded your merge (MERGE_HEAD 
exists)."));
        }
-       if (file_exists(git_path("CHERRY_PICK_HEAD"))) {
+       if (ref_exists("CHERRY_PICK_HEAD")) {
                if (advice_resolve_conflict)
                        die(_("You have not concluded your cherry-pick 
(CHERRY_PICK_HEAD exists).\n"
                            "Please, commit your changes before you merge."));
diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index 366f0bc..e2c5583 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh
@@ -415,9 +415,9 @@ __git_ps1 ()
                        fi
                elif [ -f "$g/MERGE_HEAD" ]; then
                        r="|MERGING"
-               elif [ -f "$g/CHERRY_PICK_HEAD" ]; then
+               elif git rev-parse --quiet --verify "CHERRY_PICK_HEAD" 
>/dev/null; then
                        r="|CHERRY-PICKING"
-               elif [ -f "$g/REVERT_HEAD" ]; then
+               elif git rev-parse --quiet --verify "REVERT_HEAD" >/dev/null; 
then
                        r="|REVERTING"
                elif [ -f "$g/BISECT_LOG" ]; then
                        r="|BISECTING"
diff --git a/git-gui/lib/commit.tcl b/git-gui/lib/commit.tcl
index 864b687..2b08b13 100644
--- a/git-gui/lib/commit.tcl
+++ b/git-gui/lib/commit.tcl
@@ -409,7 +409,7 @@ A rescan will be automatically started now.
        catch {file delete [gitdir MERGE_MSG]}
        catch {file delete [gitdir SQUASH_MSG]}
        catch {file delete [gitdir GITGUI_MSG]}
-       catch {file delete [gitdir CHERRY_PICK_HEAD]}
+       catch {git update-ref -d --no-deref CHERRY_PICK_HEAD}
 
        # -- Let rerere do its thing.
        #
diff --git a/sequencer.c b/sequencer.c
index f8421a8..de904aa 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -160,19 +160,20 @@ static void free_message(struct commit *commit, struct 
commit_message *msg)
 
 static void write_cherry_pick_head(struct commit *commit, const char 
*pseudoref)
 {
-       const char *filename;
-       int fd;
-       struct strbuf buf = STRBUF_INIT;
+       struct strbuf err = STRBUF_INIT;
+       void *transaction;
 
-       strbuf_addf(&buf, "%s\n", sha1_to_hex(commit->object.sha1));
+       transaction = ref_transaction_begin(&err);
+       if (!transaction)
+               die(_("Could not create transaction: %s"), err.buf);
 
-       filename = git_path("%s", pseudoref);
-       fd = open(filename, O_WRONLY | O_CREAT, 0666);
-       if (fd < 0)
-               die_errno(_("Could not open '%s' for writing"), filename);
-       if (write_in_full(fd, buf.buf, buf.len) != buf.len || close(fd))
-               die_errno(_("Could not write to '%s'"), filename);
-       strbuf_release(&buf);
+       if (ref_transaction_update(transaction, pseudoref, commit->object.sha1,
+                                  NULL, REF_NODEREF, NULL,
+                                  &err))
+               die(_("Could not write ref %s: %s"), pseudoref, err.buf);
+
+       if (ref_transaction_commit(transaction, &err))
+               die(_("Could not commit ref write %s: %s"), pseudoref, err.buf);
 }
 
 static void print_advice(int show_hint, struct replay_opts *opts)
@@ -186,7 +187,7 @@ static void print_advice(int show_hint, struct replay_opts 
*opts)
                 * (typically rebase --interactive) wants to take care
                 * of the commit itself so remove CHERRY_PICK_HEAD
                 */
-               unlink(git_path("CHERRY_PICK_HEAD"));
+               delete_ref("CHERRY_PICK_HEAD", NULL, REF_NODEREF);
                return;
        }
 
@@ -878,8 +879,8 @@ static int rollback_single_pick(void)
 {
        unsigned char head_sha1[20];
 
-       if (!file_exists(git_path("CHERRY_PICK_HEAD")) &&
-           !file_exists(git_path("REVERT_HEAD")))
+       if (read_ref("CHERRY_PICK_HEAD", head_sha1) &&
+           read_ref("REVERT_HEAD", head_sha1))
                return error(_("no cherry-pick or revert in progress"));
        if (read_ref_full("HEAD", 0, head_sha1, NULL))
                return error(_("cannot resolve HEAD"));
@@ -1014,8 +1015,8 @@ static int continue_single_pick(void)
 {
        const char *argv[] = { "commit", NULL };
 
-       if (!file_exists(git_path("CHERRY_PICK_HEAD")) &&
-           !file_exists(git_path("REVERT_HEAD")))
+       if (!ref_exists("CHERRY_PICK_HEAD") &&
+           !ref_exists("REVERT_HEAD"))
                return error(_("no cherry-pick or revert in progress"));
        return run_command_v_opt(argv, RUN_GIT_CMD);
 }
@@ -1030,8 +1031,8 @@ static int sequencer_continue(struct replay_opts *opts)
        read_populate_todo(&todo_list, opts);
 
        /* Verify that the conflict has been resolved */
-       if (file_exists(git_path("CHERRY_PICK_HEAD")) ||
-           file_exists(git_path("REVERT_HEAD"))) {
+       if (ref_exists("CHERRY_PICK_HEAD") ||
+           ref_exists("REVERT_HEAD")) {
                int ret = continue_single_pick();
                if (ret)
                        return ret;
diff --git a/t/t7509-commit.sh b/t/t7509-commit.sh
index 9ac7940..f7fd62c 100755
--- a/t/t7509-commit.sh
+++ b/t/t7509-commit.sh
@@ -163,7 +163,7 @@ test_expect_success 'commit respects CHERRY_PICK_HEAD and 
MERGE_MSG' '
        test_tick &&
        git commit -am "cherry-pick 1" --author="Cherry <che...@pick.er>" &&
        git tag cherry-pick-head &&
-       git rev-parse cherry-pick-head >.git/CHERRY_PICK_HEAD &&
+       git update-ref CHERRY_PICK_HEAD $(git rev-parse cherry-pick-head) &&
        echo "This is a MERGE_MSG" >.git/MERGE_MSG &&
        echo "cherry-pick 1b" >>foo &&
        test_tick &&
@@ -178,7 +178,7 @@ test_expect_success 'commit respects CHERRY_PICK_HEAD and 
MERGE_MSG' '
 '
 
 test_expect_success '--reset-author with CHERRY_PICK_HEAD' '
-       git rev-parse cherry-pick-head >.git/CHERRY_PICK_HEAD &&
+       git update-ref CHERRY_PICK_HEAD $(git rev-parse cherry-pick-head) &&
        echo "cherry-pick 2" >>foo &&
        test_tick &&
        git commit -am "cherry-pick 2" --reset-author &&
diff --git a/wt-status.c b/wt-status.c
index 9c686e6..661c1fb 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -1336,8 +1336,7 @@ void wt_status_get_state(struct wt_status_state *state,
                        state->rebase_in_progress = 1;
                state->branch = read_and_strip_branch("rebase-merge/head-name");
                state->onto = read_and_strip_branch("rebase-merge/onto");
-       } else if (!stat(git_path("CHERRY_PICK_HEAD"), &st) &&
-                       !get_sha1("CHERRY_PICK_HEAD", sha1)) {
+       } else if (!read_ref("CHERRY_PICK_HEAD", sha1)) {
                state->cherry_pick_in_progress = 1;
                hashcpy(state->cherry_pick_head_sha1, sha1);
        }
@@ -1345,8 +1344,7 @@ void wt_status_get_state(struct wt_status_state *state,
                state->bisect_in_progress = 1;
                state->branch = read_and_strip_branch("BISECT_START");
        }
-       if (!stat(git_path("REVERT_HEAD"), &st) &&
-           !get_sha1("REVERT_HEAD", sha1)) {
+       if (!read_ref("REVERT_HEAD", sha1)) {
                state->revert_in_progress = 1;
                hashcpy(state->revert_head_sha1, sha1);
        }
-- 
2.0.4.314.gdbf7a51-twtrsrc

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