git-update-ref man page on YellowDog

Man page or keyword search:  
man Server   18644 pages
apropos Keyword Search (all sections)
Output format
YellowDog logo
[printable version]

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

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

SYNOPSIS
       git-update-ref [-m <reason>] (-d <ref> <oldvalue> | [--no-deref] <ref>
       <newvalue> [<oldvalue>])

DESCRIPTION
       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 "ref:".

       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>.

LOGGING UPDATES
       If config parameter "core.logAllRefUpdates" is true 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:

       1. 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 format.

	  Optionally with -m:

       1. 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.

AUTHOR
       Written by Linus Torvalds <torvalds@osdl.org>.

GIT
       Part of the git(7) suite

Git 1.5.5.2			  10/21/2008		     GIT-UPDATE-REF(1)
[top]

List of man pages available for YellowDog

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net