GIT-UPDATE-REF(1)                                            Git Manual                                           GIT-UPDATE-REF(1)

       git-update-ref - Update the object name stored in a ref safely

       git update-ref [-m <reason>] [--no-deref] (-d <ref> [<oldvalue>] | [--create-reflog] <ref> <newvalue> [<oldvalue>] | --stdin [-z])

       Given two arguments, stores the <newvalue> in the <ref>, possibly dereferencing the symbolic refs. E.g. git update-ref HEAD
       <newvalue> updates the current branch head to the new object.

       Given three arguments, stores the <newvalue> in the <ref>, possibly dereferencing the symbolic refs, after verifying that
       the current value of the <ref> matches <oldvalue>. E.g. git update-ref refs/heads/master <newvalue> <oldvalue> updates the
       master branch head to <newvalue> only if its current value is <oldvalue>. You can specify 40 "0" or an empty string as
       <oldvalue> to make sure that the ref you are creating does not exist.

       It also allows a "ref" file to be a symbolic pointer to another ref file by starting with the four-byte header sequence of

       More importantly, it allows the update of a ref file to follow these symbolic pointers, whether they are symlinks or these
       "regular file symbolic refs". It follows real symlinks only if they start with "refs/": otherwise it will just try to read
       them and update them as a regular file (i.e. it will allow the filesystem to follow them, but will overwrite such a symlink
       to somewhere else with a regular filename).

       If --no-deref is given, <ref> itself is overwritten, rather than the result of following the symbolic pointers.

       In general, using

           git update-ref HEAD "$head"

       should be a lot safer than doing

           echo "$head" > "$GIT_DIR/HEAD"

       both from a symlink following standpoint and an error checking standpoint. The "refs/" rule for symlinks means that symlinks
       that point to "outside" the tree are safe: they’ll be followed for reading but not for writing (so we’ll never write through
       a ref symlink to some other tree, if you have copied a whole archive by creating a symlink tree).

       With -d flag, it deletes the named <ref> after verifying it still contains <oldvalue>.

       With --stdin, update-ref reads instructions from standard input and performs all modifications together. Specify commands of
       the form:

           update SP <ref> SP <newvalue> [SP <oldvalue>] LF
           create SP <ref> SP <newvalue> LF
           delete SP <ref> [SP <oldvalue>] LF
           verify SP <ref> [SP <oldvalue>] LF
           option SP <opt> LF
           start LF
           prepare LF
           commit LF
           abort LF

       With --create-reflog, update-ref will create a reflog for each ref even if one would not ordinarily be created.

       Quote fields containing whitespace as if they were strings in C source code; i.e., surrounded by double-quotes and with
       backslash escapes. Use 40 "0" characters or the empty string to specify a zero value. To specify a missing value, omit the
       value and its preceding SP entirely.

       Alternatively, use -z to specify in NUL-terminated format, without quoting:

           update SP <ref> NUL <newvalue> NUL [<oldvalue>] NUL
           create SP <ref> NUL <newvalue> NUL
           delete SP <ref> NUL [<oldvalue>] NUL
           verify SP <ref> NUL [<oldvalue>] NUL
           option SP <opt> NUL
           start NUL
           prepare NUL
           commit NUL
           abort NUL

       In this format, use 40 "0" to specify a zero value, and use the empty string to specify a missing value.

       In either format, values can be specified in any form that Git recognizes as an object name. Commands in any other format or
       a repeated <ref> produce an error. Command meanings are:

           Set <ref> to <newvalue> after verifying <oldvalue>, if given. Specify a zero <newvalue> to ensure the ref does not exist
           after the update and/or a zero <oldvalue> to make sure the ref does not exist before the update.

           Create <ref> with <newvalue> after verifying it does not exist. The given <newvalue> may not be zero.

           Delete <ref> after verifying it exists with <oldvalue>, if given. If given, <oldvalue> may not be zero.

           Verify <ref> against <oldvalue> but do not change it. If <oldvalue> is zero or missing, the ref must not exist.

           Modify behavior of the next command naming a <ref>. The only valid option is no-deref to avoid dereferencing a symbolic

           Start a transaction. In contrast to a non-transactional session, a transaction will automatically abort if the session
           ends without an explicit commit. This command may create a new empty transaction when the current one has been committed
           or aborted already.

           Prepare to commit the transaction. This will create lock files for all queued reference updates. If one reference could
           not be locked, the transaction will be aborted.

           Commit all reference updates queued for the transaction, ending the transaction.

           Abort the transaction, releasing all locks if the transaction is in prepared state.

       If all <ref>s can be locked with matching <oldvalue>s simultaneously, all modifications are performed. Otherwise, no
       modifications are performed. Note that while each individual <ref> is updated or deleted atomically, a concurrent reader may
       still see a subset of the modifications.

       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

       Where "oldsha1" is the 40 character hexadecimal value previously stored in <ref>, "newsha1" is the 40 character hexadecimal
       value of <newvalue> and "committer" is the committer’s name, email address and date in the standard Git committer ident

       Optionally with -m:

           oldsha1 SP newsha1 SP committer TAB message LF

       Where all fields are as described above and "message" is the value supplied to the -m option.

       An update will fail (without changing <ref>) if the current user is unable to create a new log file, append to the existing
       log file or does not have committer information available.

       Part of the git(1) suite

Git 2.39.2                                                   04/24/2023                                           GIT-UPDATE-REF(1)