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![Junio C Hamano](/assets/img/avatar_default.png)
This mechanically converts strncmp() to use prefixcmp(), but only when the parameters match specific patterns, so that they can be verified easily. Leftover from this will be fixed in a separate step, including idiotic conversions like if (!strncmp("foo", arg, 3)) => if (!(-prefixcmp(arg, "foo"))) This was done by using this script in px.perl #!/usr/bin/perl -i.bak -p if (/strncmp\(([^,]+), "([^\\"]*)", (\d+)\)/ && (length($2) == $3)) { s|strncmp\(([^,]+), "([^\\"]*)", (\d+)\)|prefixcmp($1, "$2")|; } if (/strncmp\("([^\\"]*)", ([^,]+), (\d+)\)/ && (length($1) == $3)) { s|strncmp\("([^\\"]*)", ([^,]+), (\d+)\)|(-prefixcmp($2, "$1"))|; } and running: $ git grep -l strncmp -- '*.c' | xargs perl px.perl Signed-off-by: Junio C Hamano <junkio@cox.net>
388 lines
9.8 KiB
C
388 lines
9.8 KiB
C
#include "cache.h"
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#include "builtin.h"
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#include "commit.h"
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#include "refs.h"
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#include "dir.h"
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#include "tree-walk.h"
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#include "diff.h"
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#include "revision.h"
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#include "reachable.h"
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/*
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* reflog expire
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*/
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static const char reflog_expire_usage[] =
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"git-reflog (show|expire) [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
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static unsigned long default_reflog_expire;
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static unsigned long default_reflog_expire_unreachable;
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struct cmd_reflog_expire_cb {
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struct rev_info revs;
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int dry_run;
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int stalefix;
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int verbose;
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unsigned long expire_total;
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unsigned long expire_unreachable;
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};
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struct expire_reflog_cb {
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FILE *newlog;
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const char *ref;
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struct commit *ref_commit;
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struct cmd_reflog_expire_cb *cmd;
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};
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#define INCOMPLETE (1u<<10)
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#define STUDYING (1u<<11)
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static int tree_is_complete(const unsigned char *sha1)
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{
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struct tree_desc desc;
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struct name_entry entry;
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int complete;
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struct tree *tree;
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tree = lookup_tree(sha1);
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if (!tree)
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return 0;
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if (tree->object.flags & SEEN)
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return 1;
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if (tree->object.flags & INCOMPLETE)
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return 0;
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desc.buf = tree->buffer;
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desc.size = tree->size;
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if (!desc.buf) {
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char type[20];
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void *data = read_sha1_file(sha1, type, &desc.size);
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if (!data) {
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tree->object.flags |= INCOMPLETE;
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return 0;
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}
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desc.buf = data;
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tree->buffer = data;
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}
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complete = 1;
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while (tree_entry(&desc, &entry)) {
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if (!has_sha1_file(entry.sha1) ||
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(S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) {
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tree->object.flags |= INCOMPLETE;
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complete = 0;
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}
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}
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free(tree->buffer);
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tree->buffer = NULL;
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if (complete)
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tree->object.flags |= SEEN;
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return complete;
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}
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static int commit_is_complete(struct commit *commit)
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{
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struct object_array study;
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struct object_array found;
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int is_incomplete = 0;
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int i;
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/* early return */
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if (commit->object.flags & SEEN)
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return 1;
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if (commit->object.flags & INCOMPLETE)
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return 0;
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/*
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* Find all commits that are reachable and are not marked as
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* SEEN. Then make sure the trees and blobs contained are
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* complete. After that, mark these commits also as SEEN.
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* If some of the objects that are needed to complete this
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* commit are missing, mark this commit as INCOMPLETE.
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*/
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memset(&study, 0, sizeof(study));
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memset(&found, 0, sizeof(found));
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add_object_array(&commit->object, NULL, &study);
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add_object_array(&commit->object, NULL, &found);
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commit->object.flags |= STUDYING;
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while (study.nr) {
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struct commit *c;
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struct commit_list *parent;
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c = (struct commit *)study.objects[--study.nr].item;
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if (!c->object.parsed && !parse_object(c->object.sha1))
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c->object.flags |= INCOMPLETE;
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if (c->object.flags & INCOMPLETE) {
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is_incomplete = 1;
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break;
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}
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else if (c->object.flags & SEEN)
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continue;
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for (parent = c->parents; parent; parent = parent->next) {
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struct commit *p = parent->item;
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if (p->object.flags & STUDYING)
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continue;
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p->object.flags |= STUDYING;
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add_object_array(&p->object, NULL, &study);
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add_object_array(&p->object, NULL, &found);
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}
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}
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if (!is_incomplete) {
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/*
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* make sure all commits in "found" array have all the
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* necessary objects.
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*/
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for (i = 0; i < found.nr; i++) {
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struct commit *c =
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(struct commit *)found.objects[i].item;
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if (!tree_is_complete(c->tree->object.sha1)) {
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is_incomplete = 1;
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c->object.flags |= INCOMPLETE;
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}
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}
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if (!is_incomplete) {
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/* mark all found commits as complete, iow SEEN */
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for (i = 0; i < found.nr; i++)
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found.objects[i].item->flags |= SEEN;
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}
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}
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/* clear flags from the objects we traversed */
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for (i = 0; i < found.nr; i++)
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found.objects[i].item->flags &= ~STUDYING;
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if (is_incomplete)
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commit->object.flags |= INCOMPLETE;
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else {
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/*
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* If we come here, we have (1) traversed the ancestry chain
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* from the "commit" until we reach SEEN commits (which are
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* known to be complete), and (2) made sure that the commits
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* encountered during the above traversal refer to trees that
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* are complete. Which means that we know *all* the commits
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* we have seen during this process are complete.
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*/
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for (i = 0; i < found.nr; i++)
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found.objects[i].item->flags |= SEEN;
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}
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/* free object arrays */
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free(study.objects);
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free(found.objects);
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return !is_incomplete;
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}
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static int keep_entry(struct commit **it, unsigned char *sha1)
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{
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struct commit *commit;
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if (is_null_sha1(sha1))
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return 1;
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commit = lookup_commit_reference_gently(sha1, 1);
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if (!commit)
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return 0;
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/*
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* Make sure everything in this commit exists.
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*
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* We have walked all the objects reachable from the refs
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* and cache earlier. The commits reachable by this commit
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* must meet SEEN commits -- and then we should mark them as
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* SEEN as well.
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*/
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if (!commit_is_complete(commit))
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return 0;
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*it = commit;
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return 1;
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}
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static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
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const char *email, unsigned long timestamp, int tz,
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const char *message, void *cb_data)
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{
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struct expire_reflog_cb *cb = cb_data;
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struct commit *old, *new;
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if (timestamp < cb->cmd->expire_total)
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goto prune;
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old = new = NULL;
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if (cb->cmd->stalefix &&
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(!keep_entry(&old, osha1) || !keep_entry(&new, nsha1)))
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goto prune;
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if (timestamp < cb->cmd->expire_unreachable) {
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if (!cb->ref_commit)
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goto prune;
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if (!old && !is_null_sha1(osha1))
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old = lookup_commit_reference_gently(osha1, 1);
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if (!new && !is_null_sha1(nsha1))
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new = lookup_commit_reference_gently(nsha1, 1);
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if ((old && !in_merge_bases(old, &cb->ref_commit, 1)) ||
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(new && !in_merge_bases(new, &cb->ref_commit, 1)))
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goto prune;
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}
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if (cb->newlog) {
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char sign = (tz < 0) ? '-' : '+';
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int zone = (tz < 0) ? (-tz) : tz;
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fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s",
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sha1_to_hex(osha1), sha1_to_hex(nsha1),
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email, timestamp, sign, zone,
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message);
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}
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if (cb->cmd->verbose)
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printf("keep %s", message);
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return 0;
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prune:
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if (!cb->newlog || cb->cmd->verbose)
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printf("%sprune %s", cb->newlog ? "" : "would ", message);
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return 0;
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}
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static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
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{
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struct cmd_reflog_expire_cb *cmd = cb_data;
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struct expire_reflog_cb cb;
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struct ref_lock *lock;
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char *log_file, *newlog_path = NULL;
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int status = 0;
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memset(&cb, 0, sizeof(cb));
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/* we take the lock for the ref itself to prevent it from
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* getting updated.
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*/
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lock = lock_any_ref_for_update(ref, sha1);
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if (!lock)
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return error("cannot lock ref '%s'", ref);
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log_file = xstrdup(git_path("logs/%s", ref));
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if (!file_exists(log_file))
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goto finish;
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if (!cmd->dry_run) {
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newlog_path = xstrdup(git_path("logs/%s.lock", ref));
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cb.newlog = fopen(newlog_path, "w");
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}
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cb.ref_commit = lookup_commit_reference_gently(sha1, 1);
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cb.ref = ref;
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cb.cmd = cmd;
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for_each_reflog_ent(ref, expire_reflog_ent, &cb);
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finish:
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if (cb.newlog) {
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if (fclose(cb.newlog))
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status |= error("%s: %s", strerror(errno),
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newlog_path);
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if (rename(newlog_path, log_file)) {
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status |= error("cannot rename %s to %s",
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newlog_path, log_file);
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unlink(newlog_path);
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}
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}
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free(newlog_path);
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free(log_file);
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unlock_ref(lock);
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return status;
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}
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static int reflog_expire_config(const char *var, const char *value)
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{
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if (!strcmp(var, "gc.reflogexpire"))
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default_reflog_expire = approxidate(value);
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else if (!strcmp(var, "gc.reflogexpireunreachable"))
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default_reflog_expire_unreachable = approxidate(value);
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else
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return git_default_config(var, value);
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return 0;
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}
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static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
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{
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struct cmd_reflog_expire_cb cb;
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unsigned long now = time(NULL);
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int i, status, do_all;
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git_config(reflog_expire_config);
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save_commit_buffer = 0;
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do_all = status = 0;
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memset(&cb, 0, sizeof(cb));
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if (!default_reflog_expire_unreachable)
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default_reflog_expire_unreachable = now - 30 * 24 * 3600;
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if (!default_reflog_expire)
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default_reflog_expire = now - 90 * 24 * 3600;
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cb.expire_total = default_reflog_expire;
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cb.expire_unreachable = default_reflog_expire_unreachable;
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/*
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* We can trust the commits and objects reachable from refs
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* even in older repository. We cannot trust what's reachable
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* from reflog if the repository was pruned with older git.
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*/
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
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cb.dry_run = 1;
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else if (!prefixcmp(arg, "--expire="))
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cb.expire_total = approxidate(arg + 9);
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else if (!prefixcmp(arg, "--expire-unreachable="))
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cb.expire_unreachable = approxidate(arg + 21);
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else if (!strcmp(arg, "--stale-fix"))
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cb.stalefix = 1;
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else if (!strcmp(arg, "--all"))
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do_all = 1;
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else if (!strcmp(arg, "--verbose"))
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cb.verbose = 1;
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else if (!strcmp(arg, "--")) {
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i++;
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break;
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}
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else if (arg[0] == '-')
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usage(reflog_expire_usage);
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else
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break;
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}
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if (cb.stalefix) {
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init_revisions(&cb.revs, prefix);
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if (cb.verbose)
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printf("Marking reachable objects...");
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mark_reachable_objects(&cb.revs, 0);
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if (cb.verbose)
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putchar('\n');
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}
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if (do_all)
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status |= for_each_reflog(expire_reflog, &cb);
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while (i < argc) {
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const char *ref = argv[i++];
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unsigned char sha1[20];
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if (!resolve_ref(ref, sha1, 1, NULL)) {
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status |= error("%s points nowhere!", ref);
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continue;
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}
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status |= expire_reflog(ref, sha1, 0, &cb);
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}
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return status;
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}
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/*
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* main "reflog"
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*/
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static const char reflog_usage[] =
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"git-reflog (expire | ...)";
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int cmd_reflog(int argc, const char **argv, const char *prefix)
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{
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/* With no command, we default to showing it. */
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if (argc < 2 || *argv[1] == '-')
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return cmd_log_reflog(argc, argv, prefix);
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if (!strcmp(argv[1], "show"))
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return cmd_log_reflog(argc - 1, argv + 1, prefix);
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if (!strcmp(argv[1], "expire"))
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return cmd_reflog_expire(argc - 1, argv + 1, prefix);
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/* Not a recognized reflog command..*/
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usage(reflog_usage);
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}
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