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If we are expiring reflog entries for a symbolic reference, then how
should --updateref be handled if the newest reflog entry is expired?
Option 1: Update the referred-to reference. (This is what the current
code does.) This doesn't make sense, because the referred-to reference
has its own reflog, which hasn't been rewritten.
Option 2: Update the symbolic reference itself (as in, REF_NODEREF).
This would convert the symbolic reference into a non-symbolic
reference (e.g., detaching HEAD), which is surely not what a user
would expect.
Option 3: Error out. This is plausible, but it would make the
following usage impossible:
git reflog expire ... --updateref --all
Option 4: Ignore --updateref for symbolic references.
We choose to implement option 4.
Note: another problem in this code will be fixed in a moment.
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
129 lines
4.1 KiB
Text
129 lines
4.1 KiB
Text
git-reflog(1)
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=============
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NAME
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----
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git-reflog - Manage reflog information
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SYNOPSIS
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--------
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[verse]
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'git reflog' <subcommand> <options>
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DESCRIPTION
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-----------
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The command takes various subcommands, and different options
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depending on the subcommand:
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[verse]
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'git reflog' ['show'] [log-options] [<ref>]
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'git reflog expire' [--expire=<time>] [--expire-unreachable=<time>]
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[--rewrite] [--updateref] [--stale-fix]
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[--dry-run] [--verbose] [--all | <refs>...]
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'git reflog delete' [--rewrite] [--updateref]
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[--dry-run] [--verbose] ref@\{specifier\}...
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Reference logs, or "reflogs", record when the tips of branches and
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other references were updated in the local repository. Reflogs are
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useful in various Git commands, to specify the old value of a
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reference. For example, `HEAD@{2}` means "where HEAD used to be two
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moves ago", `master@{one.week.ago}` means "where master used to point
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to one week ago in this local repository", and so on. See
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linkgit:gitrevisions[7] for more details.
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This command manages the information recorded in the reflogs.
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The "show" subcommand (which is also the default, in the absence of
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any subcommands) shows the log of the reference provided in the
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command-line (or `HEAD`, by default). The reflog covers all recent
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actions, and in addition the `HEAD` reflog records branch switching.
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`git reflog show` is an alias for `git log -g --abbrev-commit
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--pretty=oneline`; see linkgit:git-log[1] for more information.
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The "expire" subcommand prunes older reflog entries. Entries older
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than `expire` time, or entries older than `expire-unreachable` time
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and not reachable from the current tip, are removed from the reflog.
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This is typically not used directly by end users -- instead, see
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linkgit:git-gc[1].
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The "delete" subcommand deletes single entries from the reflog. Its
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argument must be an _exact_ entry (e.g. "`git reflog delete
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master@{2}`"). This subcommand is also typically not used directly by
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end users.
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OPTIONS
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-------
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Options for `show`
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~~~~~~~~~~~~~~~~~~
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`git reflog show` accepts any of the options accepted by `git log`.
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Options for `expire`
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~~~~~~~~~~~~~~~~~~~~
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--all::
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Process the reflogs of all references.
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--expire=<time>::
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Prune entries older than the specified time. If this option is
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not specified, the expiration time is taken from the
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configuration setting `gc.reflogExpire`, which in turn
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defaults to 90 days. `--expire=all` prunes entries regardless
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of their age; `--expire=never` turns off pruning of reachable
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entries (but see `--expire-unreachable`).
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--expire-unreachable=<time>::
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Prune entries older than `<time>` that are not reachable from
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the current tip of the branch. If this option is not
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specified, the expiration time is taken from the configuration
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setting `gc.reflogExpireUnreachable`, which in turn defaults
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to 30 days. `--expire-unreachable=all` prunes unreachable
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entries regardless of their age; `--expire-unreachable=never`
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turns off early pruning of unreachable entries (but see
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`--expire`).
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--updateref::
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Update the reference to the value of the top reflog entry (i.e.
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<ref>@\{0\}) if the previous top entry was pruned. (This
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option is ignored for symbolic references.)
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--rewrite::
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If a reflog entry's predecessor is pruned, adjust its "old"
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SHA-1 to be equal to the "new" SHA-1 field of the entry that
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now precedes it.
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--stale-fix::
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Prune any reflog entries that point to "broken commits". A
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broken commit is a commit that is not reachable from any of
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the reference tips and that refers, directly or indirectly, to
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a missing commit, tree, or blob object.
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+
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This computation involves traversing all the reachable objects, i.e. it
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has the same cost as 'git prune'. It is primarily intended to fix
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corruption caused by garbage collecting using older versions of Git,
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which didn't protect objects referred to by reflogs.
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-n::
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--dry-run::
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Do not actually prune any entries; just show what would have
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been pruned.
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--verbose::
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Print extra information on screen.
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Options for `delete`
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~~~~~~~~~~~~~~~~~~~~
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`git reflog delete` accepts options `--updateref`, `--rewrite`, `-n`,
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`--dry-run`, and `--verbose`, with the same meanings as when they are
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used with `expire`.
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GIT
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---
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Part of the linkgit:git[1] suite
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