#include <sys/types.h>
#include <dirent.h>
-/*
- * The low 16 bits of the "flags" field shows whether
- * a commit is part of the path to the root for that
- * parent.
- *
- * Bit 16 is an internal flag that we've seen the
- * definition for this rev, and not just seen it as
- * a parent target.
- */
-#define MAX_COMMITS (16)
-#define marked(rev) ((rev)->flags & 0xffff)
-#define SEEN 0x10000
-#define USED 0x20000
-#define REACHABLE 0x40000
+#include "revision.h"
static int show_unreachable = 0;
-static int head_supplied = 0;
static unsigned char head_sha1[20];
-struct parent {
- struct revision *parent;
- struct parent *next;
-};
-
-struct revision {
- unsigned int flags;
- unsigned char sha1[20];
- unsigned long date;
- struct parent *parent;
-};
-
-static struct revision **revs;
-static int nr_revs, rev_allocs;
-
-static int find_rev(unsigned char *sha1)
-{
- int first = 0, last = nr_revs;
-
- while (first < last) {
- int next = (first + last) / 2;
- struct revision *rev = revs[next];
- int cmp;
-
- cmp = memcmp(sha1, rev->sha1, 20);
- if (!cmp)
- return next;
- if (cmp < 0) {
- last = next;
- continue;
- }
- first = next+1;
- }
- return -first-1;
-}
-
-static struct revision *lookup_rev(unsigned char *sha1)
-{
- int pos = find_rev(sha1);
- struct revision *n;
-
- if (pos >= 0)
- return revs[pos];
-
- pos = -pos-1;
-
- if (rev_allocs == nr_revs) {
- rev_allocs = alloc_nr(rev_allocs);
- revs = realloc(revs, rev_allocs * sizeof(struct revision *));
- }
- n = malloc(sizeof(struct revision));
-
- n->flags = 0;
- memcpy(n->sha1, sha1, 20);
- n->parent = NULL;
-
- /* Insert it into the right place */
- memmove(revs + pos + 1, revs + pos, (nr_revs - pos) * sizeof(struct revision *));
- revs[pos] = n;
- nr_revs++;
-
- return n;
-}
-
-static struct revision *add_relationship(struct revision *rev, unsigned char *needs)
-{
- struct revision *parent_rev = lookup_rev(needs);
- struct parent **pp = &rev->parent, *p;
-
- while ((p = *pp) != NULL) {
- if (p->parent == parent_rev)
- return parent_rev;
- pp = &p->next;
- }
-
- p = malloc(sizeof(*p));
- p->parent = parent_rev;
- p->next = NULL;
- *pp = p;
- return parent_rev;
-}
-
-static void mark_reachable(struct revision *rev)
-{
- struct parent *p = rev->parent;
-
- /* If we've been here already, don't bother */
- if (rev->flags & REACHABLE)
- return;
- rev->flags |= REACHABLE | USED;
- while (p) {
- mark_reachable(p->parent);
- p = p->next;
- }
-}
-
static void check_connectivity(void)
{
int i;
- if (head_supplied)
- mark_reachable(lookup_rev(head_sha1));
-
/* Look up all the requirements, warn about missing objects.. */
for (i = 0; i < nr_revs; i++) {
struct revision *rev = revs[i];
int main(int argc, char **argv)
{
- int i;
+ int i, heads;
char *sha1_dir;
+ sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
+ for (i = 0; i < 256; i++) {
+ static char dir[4096];
+ sprintf(dir, "%s/%02x", sha1_dir, i);
+ fsck_dir(i, dir);
+ }
+
+ heads = 0;
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "--unreachable")) {
show_unreachable = 1;
continue;
}
if (!get_sha1_hex(argv[i], head_sha1)) {
- head_supplied = 1;
+ mark_reachable(lookup_rev(head_sha1));
+ heads++;
continue;
}
- usage("fsck-cache [[--unreachable] <head-sha1>]");
+ error("fsck-cache [[--unreachable] <head-sha1>*]");
}
- if (show_unreachable && !head_supplied)
- usage("unable to do reachability checks without a head");
- sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
- for (i = 0; i < 256; i++) {
- static char dir[4096];
- sprintf(dir, "%s/%02x", sha1_dir, i);
- fsck_dir(i, dir);
+ if (!heads) {
+ if (show_unreachable) {
+ fprintf(stderr, "unable to do reachability without a head\n");
+ show_unreachable = 0;
+ }
+ fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
}
+
check_connectivity();
return 0;
}