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Diffstat (limited to 'Documentation/git-update-ref.txt')
| -rw-r--r-- | Documentation/git-update-ref.txt | 76 |
1 files changed, 39 insertions, 37 deletions
diff --git a/Documentation/git-update-ref.txt b/Documentation/git-update-ref.txt index 3e737c2..374a2eb 100644 --- a/Documentation/git-update-ref.txt +++ b/Documentation/git-update-ref.txt @@ -8,21 +8,21 @@ git-update-ref - Update the object name stored in a ref safely SYNOPSIS -------- [verse] -'git update-ref' [-m <reason>] [--no-deref] (-d <ref> [<oldvalue>] | [--create-reflog] <ref> <newvalue> [<oldvalue>] | --stdin [-z]) +'git update-ref' [-m <reason>] [--no-deref] (-d <ref> [<old-oid>] | [--create-reflog] <ref> <new-oid> [<old-oid>] | --stdin [-z]) DESCRIPTION ----------- -Given two arguments, stores the <newvalue> in the <ref>, possibly +Given two arguments, stores the <new-oid> in the <ref>, possibly dereferencing the symbolic refs. E.g. `git update-ref HEAD -<newvalue>` updates the current branch head to the new object. +<new-oid>` updates the current branch head to the new object. -Given three arguments, stores the <newvalue> in the <ref>, +Given three arguments, stores the <new-oid> 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 +the current value of the <ref> matches <old-oid>. +E.g. `git update-ref refs/heads/master <new-oid> <old-oid>` +updates the master branch head to <new-oid> only if its current +value is <old-oid>. You can specify 40 "0" or an empty string +as <old-oid> 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 @@ -56,15 +56,15 @@ 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>. +still contains <old-oid>. 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 + update SP <ref> SP <new-oid> [SP <old-oid>] LF + create SP <ref> SP <new-oid> LF + delete SP <ref> [SP <old-oid>] LF + verify SP <ref> [SP <old-oid>] LF option SP <opt> LF start LF prepare LF @@ -82,10 +82,10 @@ 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 + update SP <ref> NUL <new-oid> NUL [<old-oid>] NUL + create SP <ref> NUL <new-oid> NUL + delete SP <ref> NUL [<old-oid>] NUL + verify SP <ref> NUL [<old-oid>] NUL option SP <opt> NUL start NUL prepare NUL @@ -100,32 +100,33 @@ recognizes as an object name. Commands in any other format or a repeated <ref> produce an error. Command meanings are: update:: - 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 + Set <ref> to <new-oid> after verifying <old-oid>, if given. + Specify a zero <new-oid> to ensure the ref does not exist + after the update and/or a zero <old-oid> to make sure the ref does not exist before the update. create:: - Create <ref> with <newvalue> after verifying it does not - exist. The given <newvalue> may not be zero. + Create <ref> with <new-oid> after verifying it does not + exist. The given <new-oid> may not be zero. delete:: - Delete <ref> after verifying it exists with <oldvalue>, if - given. If given, <oldvalue> may not be zero. + Delete <ref> after verifying it exists with <old-oid>, if + given. If given, <old-oid> may not be zero. verify:: - Verify <ref> against <oldvalue> but do not change it. If - <oldvalue> is zero or missing, the ref must not exist. + Verify <ref> against <old-oid> but do not change it. If + <old-oid> is zero or missing, the ref must not exist. option:: - Modify behavior of the next command naming a <ref>. + Modify the behavior of the next command naming a <ref>. The only valid option is `no-deref` to avoid dereferencing a symbolic ref. start:: Start a transaction. In contrast to a non-transactional session, a transaction will automatically abort if the session ends without an - explicit commit. + explicit commit. This command may create a new empty transaction when + the current one has been committed or aborted already. prepare:: Prepare to commit the transaction. This will create lock files for all @@ -140,7 +141,7 @@ abort:: Abort the transaction, releasing all locks if the transaction is in prepared state. -If all <ref>s can be locked with matching <oldvalue>s +If all <ref>s can be locked with matching <old-oid>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 @@ -148,18 +149,19 @@ 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 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 +<new-oid> and "committer" is the committer's name, email address and date in the standard Git committer ident format. Optionally with -m: |