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log: clean unneeded objects during `log --remerge-diff` 

The --remerge-diff option will need to create new blobs and trees
representing the "automatic merge" state.  If one is traversing a
long project history, one can easily get hundreds of thousands of
loose objects generated during `log --remerge-diff`.  However, none of
those loose objects are needed after we have completed our diff
operation; they can be summarily deleted.

Add a new helper function to tmp_objdir to discard all the contained
objects, and call it after each merge is handled.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren 2022-02-02 02:37:29 +00:00 committed by Junio C Hamano
parent db757e8b8d
commit 7b90ab467a
5 changed files with 28 additions and 7 deletions
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13
builtin/log.c
View File

@ -422,13 +422,12 @@ static int cmd_log_walk(struct rev_info *rev)
struct commit *commit;
int saved_nrl = 0;
int saved_dcctc = 0;
struct tmp_objdir *remerge_objdir = NULL;
if (rev->remerge_diff) {
remerge_objdir = tmp_objdir_create("remerge-diff");
if (!remerge_objdir)
rev->remerge_objdir = tmp_objdir_create("remerge-diff");
if (!rev->remerge_objdir)
die(_("unable to create temporary object directory"));
tmp_objdir_replace_primary_odb(remerge_objdir, 1);
tmp_objdir_replace_primary_odb(rev->remerge_objdir, 1);
}
if (rev->early_output)
@ -473,8 +472,10 @@ static int cmd_log_walk(struct rev_info *rev)
rev->diffopt.no_free = 0;
diff_free(&rev->diffopt);
if (rev->remerge_diff)
tmp_objdir_destroy(remerge_objdir);
if (rev->remerge_diff) {
tmp_objdir_destroy(rev->remerge_objdir);
rev->remerge_objdir = NULL;
}
if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
rev->diffopt.flags.check_failed) {

8
log-tree.c
View File

@ -4,6 +4,7 @@
#include "diff.h"
#include "object-store.h"
#include "repository.h"
#include "tmp-objdir.h"
#include "commit.h"
#include "tag.h"
#include "graph.h"
@ -946,7 +947,12 @@ static int do_remerge_diff(struct rev_info *opt,
strbuf_release(&parent1_desc);
strbuf_release(&parent2_desc);
merge_finalize(&o, &res);
/* TODO: clean up the temporary object directory */
/* Clean up the contents of the temporary object directory */
if (opt->remerge_objdir)
tmp_objdir_discard_objects(opt->remerge_objdir);
else
BUG("did a remerge diff without remerge_objdir?!?");
return !opt->loginfo;
}

3
revision.h
View File

@ -318,6 +318,9 @@ struct rev_info {
/* misc. flags related to '--no-kept-objects' */
unsigned keep_pack_cache_flags;
/* Location where temporary objects for remerge-diff are written. */
struct tmp_objdir *remerge_objdir;
};
int ref_excluded(struct string_list *, const char *path);

5
tmp-objdir.c
View File

@ -79,6 +79,11 @@ static void remove_tmp_objdir_on_signal(int signo)
raise(signo);
}
void tmp_objdir_discard_objects(struct tmp_objdir *t)
{
remove_dir_recursively(&t->path, REMOVE_DIR_KEEP_TOPLEVEL);
}
/*
* These env_* functions are for setting up the child environment; the
* "replace" variant overrides the value of any existing variable with that

6
tmp-objdir.h
View File

@ -46,6 +46,12 @@ int tmp_objdir_migrate(struct tmp_objdir *);
*/
int tmp_objdir_destroy(struct tmp_objdir *);
/*
* Remove all objects from the temporary object directory, while leaving it
* around so more objects can be added.
*/
void tmp_objdir_discard_objects(struct tmp_objdir *);
/*
* Add the temporary object directory as an alternate object store in the
* current process.