From 0b7de6c6835051a92ae3e2ff306583f5780c7ae1 Mon Sep 17 00:00:00 2001 From: Han-Wen Nienhuys Date: Thu, 16 Jul 2020 18:45:39 +0000 Subject: [PATCH 1/3] t1400: use git rev-parse for testing PSEUDOREF existence This will allow these tests to run with alternative ref backends Signed-off-by: Han-Wen Nienhuys Signed-off-by: Junio C Hamano --- t/t1400-update-ref.sh | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh index 27171f8261..7414b898f8 100755 --- a/t/t1400-update-ref.sh +++ b/t/t1400-update-ref.sh @@ -475,57 +475,57 @@ test_expect_success 'git cat-file blob master@{2005-05-26 23:42}:F (expect OTHER test_expect_success 'given old value for missing pseudoref, do not create' ' test_must_fail git update-ref PSEUDOREF $A $B 2>err && - test_path_is_missing .git/PSEUDOREF && + test_must_fail git rev-parse PSEUDOREF && test_i18ngrep "could not read ref" err ' test_expect_success 'create pseudoref' ' git update-ref PSEUDOREF $A && - test $A = $(cat .git/PSEUDOREF) + test $A = $(git rev-parse PSEUDOREF) ' test_expect_success 'overwrite pseudoref with no old value given' ' git update-ref PSEUDOREF $B && - test $B = $(cat .git/PSEUDOREF) + test $B = $(git rev-parse PSEUDOREF) ' test_expect_success 'overwrite pseudoref with correct old value' ' git update-ref PSEUDOREF $C $B && - test $C = $(cat .git/PSEUDOREF) + test $C = $(git rev-parse PSEUDOREF) ' test_expect_success 'do not overwrite pseudoref with wrong old value' ' test_must_fail git update-ref PSEUDOREF $D $E 2>err && - test $C = $(cat .git/PSEUDOREF) && + test $C = $(git rev-parse PSEUDOREF) && test_i18ngrep "unexpected object ID" err ' test_expect_success 'delete pseudoref' ' git update-ref -d PSEUDOREF && - test_path_is_missing .git/PSEUDOREF + test_must_fail git rev-parse PSEUDOREF ' test_expect_success 'do not delete pseudoref with wrong old value' ' git update-ref PSEUDOREF $A && test_must_fail git update-ref -d PSEUDOREF $B 2>err && - test $A = $(cat .git/PSEUDOREF) && + test $A = $(git rev-parse PSEUDOREF) && test_i18ngrep "unexpected object ID" err ' test_expect_success 'delete pseudoref with correct old value' ' git update-ref -d PSEUDOREF $A && - test_path_is_missing .git/PSEUDOREF + test_must_fail git rev-parse PSEUDOREF ' test_expect_success 'create pseudoref with old OID zero' ' git update-ref PSEUDOREF $A $Z && - test $A = $(cat .git/PSEUDOREF) + test $A = $(git rev-parse PSEUDOREF) ' test_expect_success 'do not overwrite pseudoref with old OID zero' ' test_when_finished git update-ref -d PSEUDOREF && test_must_fail git update-ref PSEUDOREF $B $Z 2>err && - test $A = $(cat .git/PSEUDOREF) && + test $A = $(git rev-parse PSEUDOREF) && test_i18ngrep "already exists" err ' From 09743417a201511888aee42480e468ebf47fcecb Mon Sep 17 00:00:00 2001 From: Han-Wen Nienhuys Date: Mon, 27 Jul 2020 16:25:46 +0000 Subject: [PATCH 2/3] Modify pseudo refs through ref backend storage The previous behavior was introduced in commit 74ec19d4be ("pseudorefs: create and use pseudoref update and delete functions", Jul 31, 2015), with the justification "alternate ref backends still need to store pseudorefs in GIT_DIR". Refs such as REBASE_HEAD are read through the ref backend. This can only work consistently if they are written through the ref backend as well. Tooling that works directly on files under .git should be updated to use git commands to read refs instead. The following behaviors change: * Updates to pseudorefs (eg. ORIG_HEAD) with core.logAllRefUpdates=always will create reflogs for the pseudoref. * non-HEAD pseudoref symrefs are also dereferenced on deletion. Update t1405 accordingly. Signed-off-by: Han-Wen Nienhuys Signed-off-by: Junio C Hamano --- Documentation/git-update-ref.txt | 13 ++-- refs.c | 120 ++----------------------------- t/t1400-update-ref.sh | 10 +-- t/t1405-main-ref-store.sh | 5 +- 4 files changed, 23 insertions(+), 125 deletions(-) diff --git a/Documentation/git-update-ref.txt b/Documentation/git-update-ref.txt index 3e737c2360..d401234b03 100644 --- a/Documentation/git-update-ref.txt +++ b/Documentation/git-update-ref.txt @@ -148,12 +148,13 @@ still see a subset of the modifications. LOGGING UPDATES --------------- -If config parameter "core.logAllRefUpdates" is true and the ref is one under -"refs/heads/", "refs/remotes/", "refs/notes/", or the symbolic ref HEAD; or -the file "$GIT_DIR/logs/" exists then `git update-ref` will append -a line to the log file "$GIT_DIR/logs/" (dereferencing all -symbolic refs before creating the log name) describing the change -in ref value. Log lines are formatted as: +If config parameter "core.logAllRefUpdates" is true and the ref is one +under "refs/heads/", "refs/remotes/", "refs/notes/", or a pseudoref +like HEAD or ORIG_HEAD; or the file "$GIT_DIR/logs/" exists then +`git update-ref` will append a line to the log file +"$GIT_DIR/logs/" (dereferencing all symbolic refs before creating +the log name) describing the change in ref value. Log lines are +formatted as: oldsha1 SP newsha1 SP committer LF diff --git a/refs.c b/refs.c index b1dc81640b..0be6bf6d2b 100644 --- a/refs.c +++ b/refs.c @@ -739,102 +739,6 @@ long get_files_ref_lock_timeout_ms(void) return timeout_ms; } -static int write_pseudoref(const char *pseudoref, const struct object_id *oid, - const struct object_id *old_oid, struct strbuf *err) -{ - const char *filename; - int fd; - struct lock_file lock = LOCK_INIT; - struct strbuf buf = STRBUF_INIT; - int ret = -1; - - if (!oid) - return 0; - - strbuf_addf(&buf, "%s\n", oid_to_hex(oid)); - - filename = git_path("%s", pseudoref); - fd = hold_lock_file_for_update_timeout(&lock, filename, 0, - get_files_ref_lock_timeout_ms()); - if (fd < 0) { - strbuf_addf(err, _("could not open '%s' for writing: %s"), - filename, strerror(errno)); - goto done; - } - - if (old_oid) { - struct object_id actual_old_oid; - - if (read_ref(pseudoref, &actual_old_oid)) { - if (!is_null_oid(old_oid)) { - strbuf_addf(err, _("could not read ref '%s'"), - pseudoref); - rollback_lock_file(&lock); - goto done; - } - } else if (is_null_oid(old_oid)) { - strbuf_addf(err, _("ref '%s' already exists"), - pseudoref); - rollback_lock_file(&lock); - goto done; - } else if (!oideq(&actual_old_oid, old_oid)) { - strbuf_addf(err, _("unexpected object ID when writing '%s'"), - pseudoref); - rollback_lock_file(&lock); - goto done; - } - } - - if (write_in_full(fd, buf.buf, buf.len) < 0) { - strbuf_addf(err, _("could not write to '%s'"), filename); - rollback_lock_file(&lock); - goto done; - } - - commit_lock_file(&lock); - ret = 0; -done: - strbuf_release(&buf); - return ret; -} - -static int delete_pseudoref(const char *pseudoref, const struct object_id *old_oid) -{ - const char *filename; - - filename = git_path("%s", pseudoref); - - if (old_oid && !is_null_oid(old_oid)) { - struct lock_file lock = LOCK_INIT; - int fd; - struct object_id actual_old_oid; - - fd = hold_lock_file_for_update_timeout( - &lock, filename, 0, - get_files_ref_lock_timeout_ms()); - if (fd < 0) { - error_errno(_("could not open '%s' for writing"), - filename); - return -1; - } - if (read_ref(pseudoref, &actual_old_oid)) - die(_("could not read ref '%s'"), pseudoref); - if (!oideq(&actual_old_oid, old_oid)) { - error(_("unexpected object ID when deleting '%s'"), - pseudoref); - rollback_lock_file(&lock); - return -1; - } - - unlink(filename); - rollback_lock_file(&lock); - } else { - unlink(filename); - } - - return 0; -} - int refs_delete_ref(struct ref_store *refs, const char *msg, const char *refname, const struct object_id *old_oid, @@ -843,11 +747,6 @@ int refs_delete_ref(struct ref_store *refs, const char *msg, struct ref_transaction *transaction; struct strbuf err = STRBUF_INIT; - if (ref_type(refname) == REF_TYPE_PSEUDOREF) { - assert(refs == get_main_ref_store(the_repository)); - return delete_pseudoref(refname, old_oid); - } - transaction = ref_store_transaction_begin(refs, &err); if (!transaction || ref_transaction_delete(transaction, refname, old_oid, @@ -1179,18 +1078,13 @@ int refs_update_ref(struct ref_store *refs, const char *msg, struct strbuf err = STRBUF_INIT; int ret = 0; - if (ref_type(refname) == REF_TYPE_PSEUDOREF) { - assert(refs == get_main_ref_store(the_repository)); - ret = write_pseudoref(refname, new_oid, old_oid, &err); - } else { - t = ref_store_transaction_begin(refs, &err); - if (!t || - ref_transaction_update(t, refname, new_oid, old_oid, - flags, msg, &err) || - ref_transaction_commit(t, &err)) { - ret = 1; - ref_transaction_free(t); - } + t = ref_store_transaction_begin(refs, &err); + if (!t || + ref_transaction_update(t, refname, new_oid, old_oid, flags, msg, + &err) || + ref_transaction_commit(t, &err)) { + ret = 1; + ref_transaction_free(t); } if (ret) { const char *str = _("update_ref failed for ref '%s': %s"); diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh index 7414b898f8..65d349fb33 100755 --- a/t/t1400-update-ref.sh +++ b/t/t1400-update-ref.sh @@ -160,10 +160,10 @@ test_expect_success 'core.logAllRefUpdates=always creates reflog by default' ' git reflog exists $outside ' -test_expect_success 'core.logAllRefUpdates=always creates no reflog for ORIG_HEAD' ' +test_expect_success 'core.logAllRefUpdates=always creates reflog for ORIG_HEAD' ' test_config core.logAllRefUpdates always && git update-ref ORIG_HEAD $A && - test_must_fail git reflog exists ORIG_HEAD + git reflog exists ORIG_HEAD ' test_expect_success '--no-create-reflog overrides core.logAllRefUpdates=always' ' @@ -476,7 +476,7 @@ test_expect_success 'git cat-file blob master@{2005-05-26 23:42}:F (expect OTHER test_expect_success 'given old value for missing pseudoref, do not create' ' test_must_fail git update-ref PSEUDOREF $A $B 2>err && test_must_fail git rev-parse PSEUDOREF && - test_i18ngrep "could not read ref" err + test_i18ngrep "unable to resolve reference" err ' test_expect_success 'create pseudoref' ' @@ -497,7 +497,7 @@ test_expect_success 'overwrite pseudoref with correct old value' ' test_expect_success 'do not overwrite pseudoref with wrong old value' ' test_must_fail git update-ref PSEUDOREF $D $E 2>err && test $C = $(git rev-parse PSEUDOREF) && - test_i18ngrep "unexpected object ID" err + test_i18ngrep "cannot lock ref.*expected" err ' test_expect_success 'delete pseudoref' ' @@ -509,7 +509,7 @@ test_expect_success 'do not delete pseudoref with wrong old value' ' git update-ref PSEUDOREF $A && test_must_fail git update-ref -d PSEUDOREF $B 2>err && test $A = $(git rev-parse PSEUDOREF) && - test_i18ngrep "unexpected object ID" err + test_i18ngrep "cannot lock ref.*expected" err ' test_expect_success 'delete pseudoref with correct old value' ' diff --git a/t/t1405-main-ref-store.sh b/t/t1405-main-ref-store.sh index 331899ddc4..74af927fba 100755 --- a/t/t1405-main-ref-store.sh +++ b/t/t1405-main-ref-store.sh @@ -31,7 +31,10 @@ test_expect_success 'create_symref(FOO, refs/heads/master)' ' test_expect_success 'delete_refs(FOO, refs/tags/new-tag)' ' git rev-parse FOO -- && git rev-parse refs/tags/new-tag -- && - $RUN delete-refs 0 nothing FOO refs/tags/new-tag && + m=$(git rev-parse master) && + REF_NO_DEREF=1 && + $RUN delete-refs $REF_NO_DEREF nothing FOO refs/tags/new-tag && + test_must_fail git rev-parse --symbolic-full-name FOO && test_must_fail git rev-parse FOO -- && test_must_fail git rev-parse refs/tags/new-tag -- ' From 55dd8b9108679da122d2c69fda3b9413651af4d7 Mon Sep 17 00:00:00 2001 From: Han-Wen Nienhuys Date: Mon, 27 Jul 2020 16:25:47 +0000 Subject: [PATCH 3/3] Make HEAD a PSEUDOREF rather than PER_WORKTREE. This is consistent with the definition of REF_TYPE_PSEUDOREF (uppercase in the root ref namespace). Signed-off-by: Han-Wen Nienhuys Signed-off-by: Junio C Hamano --- refs.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/refs.c b/refs.c index 0be6bf6d2b..605163c569 100644 --- a/refs.c +++ b/refs.c @@ -676,10 +676,9 @@ int dwim_log(const char *str, int len, struct object_id *oid, char **log) static int is_per_worktree_ref(const char *refname) { - return !strcmp(refname, "HEAD") || - starts_with(refname, "refs/worktree/") || - starts_with(refname, "refs/bisect/") || - starts_with(refname, "refs/rewritten/"); + return starts_with(refname, "refs/worktree/") || + starts_with(refname, "refs/bisect/") || + starts_with(refname, "refs/rewritten/"); } static int is_pseudoref_syntax(const char *refname)