[PATCH v3 0/3] Remove special casing for PSEUDOREF updates

["Han-Wen Nienhuys via GitGitGadget" <gitgitgadget@gmail.com>]

This gets rid of the special casing code for pseudorefs in refs.c

This is in preparation for reftable.

v3

 * tweak git-update-ref.txt description for logAllRefUpdates

Han-Wen Nienhuys (3):
  t1400: use git rev-parse for testing PSEUDOREF existence
  Modify pseudo refs through ref backend storage
  Make HEAD a PSEUDOREF rather than PER_WORKTREE.

 Documentation/git-update-ref.txt |  13 ++--
 refs.c                           | 127 +++----------------------------
 t/t1400-update-ref.sh            |  30 ++++----
 t/t1405-main-ref-store.sh        |   5 +-
 4 files changed, 36 insertions(+), 139 deletions(-)


base-commit: b6a658bd00c9c29e07f833cabfc0ef12224e277a
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-673%2Fhanwen%2Fpseudoref-v3
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-673/hanwen/pseudoref-v3
Pull-Request: https://github.com/gitgitgadget/git/pull/673

Range-diff vs v2:

 1:  9c3dc4b2cb = 1:  28bd3534d0 t1400: use git rev-parse for testing PSEUDOREF existence
 2:  871b411517 ! 2:  79cd5dd480 Modify pseudo refs through ref backend storage
     @@ Commit message
      
          Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
      
     + ## Documentation/git-update-ref.txt ##
     +@@ Documentation/git-update-ref.txt: 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 "$GIT_DIR/logs/<ref>" exists then `git update-ref` will append
     +-a line to the log file "$GIT_DIR/logs/<ref>" (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 "$GIT_DIR/logs/<ref>" exists then
     ++`git update-ref` will append a line to the log file
     ++"$GIT_DIR/logs/<ref>" (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
     + 
     +
       ## refs.c ##
      @@ refs.c: long get_files_ref_lock_timeout_ms(void)
       	return timeout_ms;
 3:  1c2b9d5f17 = 3:  3ab9f2f04e Make HEAD a PSEUDOREF rather than PER_WORKTREE.

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