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compact: preserve backup database until compacted database is in place

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It is less error prone and window of failure opportunity is smaller
if the old (backup) database is always renamed (instead of sometimes
rmtree'd) before new (compacted) database is put into its place.
Finally rmtree() old database in case old database backup is not kept.
This commit is contained in:
Tomi Ollila 2013-11-15 00:03:25 +02:00 committed by David Bremner
parent 19a89753ca
commit cb6cc296e2
1 changed files with 27 additions and 17 deletions
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44
lib/database.cc
View file

@ -873,6 +873,7 @@ notmuch_database_compact (const char *path,
notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS; notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
notmuch_database_t *notmuch = NULL; notmuch_database_t *notmuch = NULL;
struct stat statbuf; struct stat statbuf;
notmuch_bool_t keep_backup;
local = talloc_new (NULL); local = talloc_new (NULL);
if (! local) if (! local)
@ -898,17 +899,27 @@ notmuch_database_compact (const char *path,
goto DONE; goto DONE;
} }
if (backup_path != NULL) { if (backup_path == NULL) {
if (stat (backup_path, &statbuf) != -1) { if (! (backup_path = talloc_asprintf (local, "%s.old", xapian_path))) {
fprintf (stderr, "Backup path already exists: %s\n", backup_path); ret = NOTMUCH_STATUS_OUT_OF_MEMORY;
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
if (errno != ENOENT) {
fprintf (stderr, "Unknown error while stat()ing backup path: %s\n",
strerror (errno));
goto DONE; goto DONE;
} }
keep_backup = FALSE;
}
else {
keep_backup = TRUE;
}
if (stat (backup_path, &statbuf) != -1) {
fprintf (stderr, "Path already exists: %s\n", backup_path);
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
}
if (errno != ENOENT) {
fprintf (stderr, "Unknown error while stat()ing path: %s\n",
strerror (errno));
ret = NOTMUCH_STATUS_FILE_ERROR;
goto DONE;
} }
try { try {
@ -924,14 +935,10 @@ notmuch_database_compact (const char *path,
goto DONE; goto DONE;
} }
if (backup_path) { if (rename (xapian_path, backup_path)) {
if (rename (xapian_path, backup_path)) { fprintf (stderr, "Error moving old database out of the way\n");
fprintf (stderr, "Error moving old database out of the way\n"); ret = NOTMUCH_STATUS_FILE_ERROR;
ret = NOTMUCH_STATUS_FILE_ERROR; goto DONE;
goto DONE;
}
} else {
rmtree (xapian_path);
} }
if (rename (compact_xapian_path, xapian_path)) { if (rename (compact_xapian_path, xapian_path)) {
@ -940,6 +947,9 @@ notmuch_database_compact (const char *path,
goto DONE; goto DONE;
} }
if (! keep_backup)
rmtree (backup_path);
DONE: DONE:
if (notmuch) if (notmuch)
notmuch_database_destroy (notmuch); notmuch_database_destroy (notmuch);