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home:dirkmueller:acdc:sp5-rebuild
rpm.26687
bdb_ro_backport.diff
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File bdb_ro_backport.diff of Package rpm.26687
--- ./configure.ac.orig 2020-12-09 10:55:50.304435035 +0000 +++ ./configure.ac 2020-12-09 10:58:30.751995543 +0000 @@ -625,6 +625,20 @@ AS_IF([test "$enable_ndb" = yes],[ AM_CONDITIONAL([NDB], [test "$enable_ndb" = yes]) #================= +# Process --enable-bdb-ro +AC_ARG_ENABLE([bdb-ro], [AS_HELP_STRING([--enable-bdb-ro (EXPERIMENTAL)],[enable the read-only Berkeley DB code])], +[case "$enable_bdb_ro" in +yes|no) ;; +*) AC_MSG_ERROR([invalid argument to --enable-bdb-ro]) + ;; +esac], +[enable_bdb_ro=no]) +AS_IF([test "$enable_bdb_ro" = yes],[ + AC_DEFINE(WITH_BDB_RO, 1, [Build with read-only Berkeley DB]) +]) +AM_CONDITIONAL([BDB_RO], [test "$enable_bdb_ro" = yes]) + +#================= # Check for LMDB support AC_ARG_ENABLE([lmdb], [AS_HELP_STRING([--enable-lmdb=@<:@yes/no/auto@:>@ (EXPERIMENTAL)], --- ./lib/Makefile.am.orig 2020-12-09 10:55:50.304435035 +0000 +++ ./lib/Makefile.am 2020-12-09 10:58:30.751995543 +0000 @@ -68,6 +68,10 @@ librpm_la_LIBADD += @WITH_DB_LIB@ endif endif +if BDB_RO +librpm_la_SOURCES += backend/bdb_ro.c +endif + if NDB librpm_la_SOURCES += \ backend/ndb/glue.c \ --- ./lib/backend/bdb_ro.c.orig 2020-12-09 10:58:30.751995543 +0000 +++ ./lib/backend/bdb_ro.c 2020-12-09 11:13:07.193592542 +0000 @@ -0,0 +1,816 @@ +#include "system.h" + +#include <sys/types.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <stdint.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> + +#include "lib/rpmdb_internal.h" +#include <rpm/rpmstring.h> +#include <rpm/rpmlog.h> + +#define BDB_HASH 0 +#define BDB_BTREE 1 + +struct dbiCursor_s; + +struct bdb_kv { + unsigned char *kv; + unsigned int len; +}; + +struct bdb_db { + int fd; /* file descriptor of database */ + int type; /* BDB_HASH / BDB_BTREE */ + unsigned int pagesize; + unsigned int lastpage; + int swapped; /* different endianess? */ + /* btree */ + unsigned int root; /* root page of the b-tree */ + /* hash */ + unsigned int maxbucket; + unsigned int highmask; + unsigned int lowmask; + unsigned int spares[32]; /* spare pages for each splitpoint */ +}; + +struct bdb_cur { + struct bdb_db *db; + + struct bdb_kv key; /* key and value from the db entry */ + struct bdb_kv val; + + unsigned char *page; /* the page we're looking at */ + + unsigned char *ovpage; + struct bdb_kv keyov; /* space to store oversized keys/values */ + struct bdb_kv valov; + + int state; /* 1: onpage, -1: error */ + int idx; /* entry index */ + int numidx; /* number of entries on the page */ + int islookup; /* we're doing a lookup operation */ + + /* hash */ + unsigned int bucket; /* current bucket */ +}; + + +static void swap16(unsigned char *p) +{ + int a = p[0]; + p[0] = p[1]; + p[1] = a; +} + +static void swap32(unsigned char *p) +{ + int a = p[0]; + p[0] = p[3]; + p[3] = a; + a = p[1]; + p[1] = p[2]; + p[2] = a; +} + +static void swap32_2(unsigned char *p) +{ + swap32(p); + swap32(p + 4); +} + +static void bdb_swapmetapage(struct bdb_db *db, unsigned char *page) +{ + int i, maxi = db->type == BDB_HASH ? 224 : 92; + for (i = 8; i < maxi; i += 4) + swap32((unsigned char *)(page + i)); + swap32((unsigned char *)(page + 24)); +} + +static void bdb_swappage(struct bdb_db *db, unsigned char *page) +{ + unsigned int pagesize = db->pagesize; + int type, i, nent, off; + swap32(page + 8); /* page number */ + swap32_2(page + 12); /* prev/next page */ + swap16(page + 20); /* nitems */ + swap16(page + 22); /* highfree */ + + type = page[25]; + if (type != 2 && type != 13 && type != 3 && type != 5) + return; + nent = *(uint16_t *)(page + 20); + if (nent > (pagesize - 26) / 2) + nent = (pagesize - 26) / 2; + for (i = 0; i < nent; i++) { + int minoff = 26 + nent * 2; + swap16(page + 26 + i * 2); /* offset */ + off = *(uint16_t *)(page + 26 + i * 2); + if (off < minoff || off >= pagesize) + continue; + if (type == 2 || type == 13) { /* hash */ + if (page[off] == 3 && off + 12 <= pagesize) + swap32_2(page + off + 4); /* page no/length */ + } else if (type == 3) { /* btree internal */ + if (off + 12 > pagesize) + continue; + swap16(page + off); /* length */ + swap32_2(page + off + 4); /* page no/num recs */ + if (page[off + 2] == 3 && off + 24 <= pagesize) + swap32_2(page + off + 16); /* with overflow page/length */ + } else if (type == 5) { /* btree leaf */ + if (off + 3 <= pagesize && page[off + 2] == 1) + swap16(page + off); /* length */ + else if (off + 12 <= pagesize && page[off + 2] == 3) + swap32_2(page + off + 4); /* overflow page/length */ + } + } +} + +static int bdb_getpage(struct bdb_db *db, unsigned char *page, unsigned int pageno) +{ + if (!pageno || pageno > db->lastpage) + return -1; + if (pread(db->fd, page, db->pagesize, (off_t)pageno * db->pagesize) != db->pagesize) { + rpmlog(RPMLOG_ERR, "pread: %s\n", strerror(errno)); + return -1; + } + if (db->swapped) + bdb_swappage(db, page); + if (pageno != *(uint32_t *)(page + 8)) + return -1; + return 0; +} + +static void bdb_close(struct bdb_db *db) +{ + if (db->fd >= 0) + close(db->fd); + free(db); +} + +static struct bdb_db *bdb_open(const char *name) +{ + uint32_t meta[512 / 4]; + int i, fd; + struct bdb_db *db; + + fd = open(name, O_RDONLY); + if (!fd) { + rpmlog(RPMLOG_ERR, "%s: %s\n", name, strerror(errno)); + return NULL; + } + db = xcalloc(1, sizeof(*db)); + db->fd = fd; + if (pread(fd, meta, 512, 0) != 512) { + rpmlog(RPMLOG_ERR, "%s: pread: %s\n", name, strerror(errno)); + bdb_close(db); + return NULL; + } + if (meta[3] == 0x00061561 || meta[3] == 0x61150600) { + db->type = BDB_HASH; + db->swapped = meta[3] == 0x61150600; + } else if (meta[3] == 0x00053162 || meta[3] == 0x62310500) { + db->type = BDB_BTREE; + db->swapped = meta[3] == 0x62310500; + } else { + rpmlog(RPMLOG_ERR, "%s: not a berkeley db hash/btree database\n", name); + bdb_close(db); + return NULL; + } + if (db->swapped) + bdb_swapmetapage(db, (unsigned char *)meta); + db->pagesize = meta[5]; + db->lastpage = meta[8]; + if (db->type == BDB_HASH) { + if (meta[4] < 8 || meta[4] > 10) { + rpmlog(RPMLOG_ERR, "%s: unsupported hash version %d\n", name, meta[4]); + bdb_close(db); + return NULL; + } + db->maxbucket = meta[18]; + db->highmask = meta[19]; + db->lowmask = meta[20]; + for (i = 0; i < 32; i++) + db->spares[i] = meta[24 + i]; + } + if (db->type == BDB_BTREE) { + if (meta[4] < 9 || meta[4] > 10) { + rpmlog(RPMLOG_ERR, "%s: unsupported btree version %d\n", name, meta[4]); + bdb_close(db); + return NULL; + } + db->root = meta[22]; + } + return db; +} + + +/****** overflow handling ******/ + +static int ovfl_get(struct bdb_cur *cur, struct bdb_kv *kv, struct bdb_kv *ov, uint32_t *pagenolen) +{ + unsigned int pageno = pagenolen[0]; + unsigned int len = pagenolen[1]; + unsigned int plen; + unsigned char *p; + + if (len == 0) + return -1; + if (len > ov->len) { + if (ov->kv) + ov->kv = xrealloc(ov->kv, len); + else + ov->kv = xmalloc(len); + ov->len = len; + } + if (!cur->ovpage) + cur->ovpage = xmalloc(cur->db->pagesize); + p = ov->kv; + while (len > 0) { + if (bdb_getpage(cur->db, cur->ovpage, pageno)) + return -1; + if (cur->ovpage[25] != 7) + return -1; + plen = *(uint16_t *)(cur->ovpage + 22); + if (plen + 26 > cur->db->pagesize || plen > len) + return -1; + memcpy(p, cur->ovpage + 26, plen); + p += plen; + len -= plen; + pageno = *(uint32_t *)(cur->ovpage + 16); + } + if (kv) { + kv->kv = ov->kv; + kv->len = pagenolen[1]; + } + return 0; +} + + +/****** hash implementation ******/ + +static int hash_bucket_to_page(struct bdb_db *db, unsigned int bucket) +{ + unsigned int b; + int i = 0; + for (b = bucket; b; b >>= 1) + i++; + return bucket + db->spares[i]; +} + +static int hash_lookup(struct bdb_cur *cur, const unsigned char *key, unsigned int keyl) +{ + uint32_t bucket; + unsigned int pg, i; + cur->state = -1; + for (bucket = 0, i = 0; i < keyl; i++) + bucket = (bucket * 16777619) ^ key[i]; + bucket &= cur->db->highmask; + if (bucket > cur->db->maxbucket) + bucket &= cur->db->lowmask; + cur->bucket = bucket; + pg = hash_bucket_to_page(cur->db, bucket); + if (bdb_getpage(cur->db, cur->page, pg)) + return -1; + if (cur->page[25] != 8 && cur->page[25] != 13) + return -1; + cur->idx = (unsigned int)-2; + cur->numidx = *(uint16_t *)(cur->page + 20); + cur->state = 1; + return 0; +} + +static int hash_getkv(struct bdb_cur *cur, struct bdb_kv *kv, struct bdb_kv *ov, int off, int len) +{ + if (len <= 0 || off + len > cur->db->pagesize) + return -1; + if (cur->page[off] == 1) { + kv->kv = cur->page + off + 1; + kv->len = len - 1; + } else if (cur->page[off] == 3) { + uint32_t ovlpage[2]; + if (len != 12) + return -1; + memcpy(ovlpage, cur->page + off + 4, 8); /* off is unaligned */ + if (ovfl_get(cur, kv, ov, ovlpage)) + return -1; + } else { + return -1; + } + return 0; +} + +static int hash_next(struct bdb_cur *cur) +{ + int pagesize = cur->db->pagesize; + int koff, klen, voff, vlen; + if (!cur->state && hash_lookup(cur, 0, 0)) + return -1; + cur->idx += 2; + for (;;) { + if (cur->idx + 1 >= cur->numidx) { + unsigned int pg; + cur->idx = cur->numidx = 0; + pg = *(uint32_t *)(cur->page + 16); + if (!pg) { + if (cur->islookup || cur->bucket >= cur->db->maxbucket) + return 1; + pg = hash_bucket_to_page(cur->db, ++cur->bucket); + } + if (bdb_getpage(cur->db, cur->page, pg)) + return -1; + if (cur->page[25] != 8 && cur->page[25] != 13) + return -1; + cur->numidx = *(uint16_t *)(cur->page + 20); + continue; + } + koff = *(uint16_t *)(cur->page + 26 + 2 * cur->idx); + voff = *(uint16_t *)(cur->page + 28 + 2 * cur->idx); + if (koff >= pagesize || voff >= pagesize) + return -1; + if (cur->idx == 0) + klen = pagesize - koff; + else + klen = *(uint16_t *)(cur->page + 24 + 2 * cur->idx) - koff; + vlen = koff - voff; + if (hash_getkv(cur, &cur->key, &cur->keyov, koff, klen)) + return -1; + if (!cur->islookup && hash_getkv(cur, &cur->val, &cur->valov, voff, vlen)) + return -1; + return 0; + } +} + +static int hash_getval(struct bdb_cur *cur) +{ + int koff, voff; + if (cur->state != 1 || cur->idx + 1 >= cur->numidx) + return -1; + koff = *(uint16_t *)(cur->page + 26 + 2 * cur->idx); + voff = *(uint16_t *)(cur->page + 28 + 2 * cur->idx); + return hash_getkv(cur, &cur->val, &cur->valov, voff, koff - voff); +} + + +/****** btree implementation ******/ + +static int btree_lookup(struct bdb_cur *cur, const unsigned char *key, unsigned int keylen) +{ + int pagesize = cur->db->pagesize; + int off, lastoff, idx, numidx; + unsigned int pg; + unsigned char *ekey; + unsigned int ekeylen; + int cmp; + + cur->state = -1; + pg = cur->db->root; + for (;;) { + if (bdb_getpage(cur->db, cur->page, pg)) + return -1; + if (cur->page[25] == 5) + break; /* found leaf page */ + if (cur->page[25] != 3) + return -1; + numidx = *(uint16_t *)(cur->page + 20); + if (!numidx) + return -1; + for (lastoff = 0, idx = 0; idx < numidx; idx++, lastoff = off) { + off = *(uint16_t *)(cur->page + 26 + 2 * idx); + if ((off & 3) != 0 || off + 3 > pagesize) + return -1; + ekeylen = *(uint16_t *)(cur->page + off); + if (off + 12 + ekeylen > pagesize) + return -1; + if (!keylen) { + lastoff = off; + break; + } + if (idx == 0) + continue; + ekey = cur->page + off + 12; + if ((cur->page[off + 2] & 0x7f) == 3) { + if (ekeylen != 12) + return -1; + if (ovfl_get(cur, 0, &cur->keyov, (uint32_t *)(ekey + 4))) + return -1; + ekeylen = *(uint32_t *)(ekey + 8); + ekey = cur->keyov.kv; + } else if ((cur->page[off + 2] & 0x7f) != 1) { + return -1; + } + cmp = memcmp(ekey, key, keylen < ekeylen ? keylen : ekeylen); + if (cmp > 0 || (cmp == 0 && ekeylen > keylen)) + break; + } + pg = *(uint32_t *)(cur->page + lastoff + 4); + } + cur->idx = (unsigned int)-2; + cur->numidx = *(uint16_t *)(cur->page + 20); + cur->state = 1; + return 0; +} + +static int btree_getkv(struct bdb_cur *cur, struct bdb_kv *kv, struct bdb_kv *ov, int off) +{ + if ((off & 3) != 0) + return -1; + if (cur->page[off + 2] == 1) { + int len = *(uint16_t *)(cur->page + off); + if (off + 3 + len > cur->db->pagesize) + return -1; + kv->kv = cur->page + off + 3; + kv->len = len; + } else if (cur->page[off + 2] == 3) { + if (off + 12 > cur->db->pagesize) + return -1; + if (ovfl_get(cur, kv, ov, (uint32_t *)(cur->page + off + 4))) + return -1; + } else { + return -1; + } + return 0; +} + +static int btree_next(struct bdb_cur *cur) +{ + int pagesize = cur->db->pagesize; + int koff, voff; + if (!cur->state && btree_lookup(cur, 0, 0)) + return -1; + cur->idx += 2; + for (;;) { + if (cur->idx + 1 >= cur->numidx) { + unsigned int pg; + cur->idx = cur->numidx = 0; + pg = *(uint32_t *)(cur->page + 16); + if (cur->islookup || !pg) + return 1; + if (bdb_getpage(cur->db, cur->page, pg)) + return -1; + if (cur->page[25] != 5) + return -1; + cur->numidx = *(uint16_t *)(cur->page + 20); + continue; + } + koff = *(uint16_t *)(cur->page + 26 + 2 * cur->idx); + voff = *(uint16_t *)(cur->page + 28 + 2 * cur->idx); + if (koff + 3 > pagesize || voff + 3 > pagesize) + return -1; + if ((cur->page[koff + 2] & 0x80) != 0 || (cur->page[voff + 2] & 0x80) != 0) + continue; /* ignore deleted */ + if (btree_getkv(cur, &cur->key, &cur->keyov, koff)) + return -1; + if (!cur->islookup && btree_getkv(cur, &cur->val, &cur->valov, voff)) + return -1; + return 0; + } +} + +static int btree_getval(struct bdb_cur *cur) +{ + int voff; + if (cur->state != 1 || cur->idx + 1 >= cur->numidx) + return -1; + voff = *(uint16_t *)(cur->page + 28 + 2 * cur->idx); + return btree_getkv(cur, &cur->val, &cur->valov, voff); +} + + +/****** cursor functions ******/ + +static struct bdb_cur *cur_open(struct bdb_db *db) +{ + struct bdb_cur *cur = xcalloc(1, sizeof(*cur)); + cur->db = db; + cur->page = xmalloc(db->pagesize); + return cur; +} + +static void cur_close(struct bdb_cur *cur) +{ + if (cur->page) + free(cur->page); + if (cur->ovpage) + free(cur->ovpage); + if (cur->keyov.kv) + free(cur->keyov.kv); + if (cur->valov.kv) + free(cur->valov.kv); + free(cur); +} + +static int cur_next(struct bdb_cur *cur) +{ + if (cur->state < 0) + return -1; + if (cur->db->type == BDB_HASH) + return hash_next(cur); + if (cur->db->type == BDB_BTREE) + return btree_next(cur); + return -1; +} + +static int cur_getval(struct bdb_cur *cur) +{ + if (cur->state < 0) + return -1; + if (cur->db->type == BDB_HASH) + return hash_getval(cur); + if (cur->db->type == BDB_BTREE) + return btree_getval(cur); + return -1; +} + +static int cur_lookup(struct bdb_cur *cur, const unsigned char *key, unsigned int keyl) +{ + int r = -1; + if (cur->db->type == BDB_HASH) + r = hash_lookup(cur, key, keyl); + if (cur->db->type == BDB_BTREE) + r = btree_lookup(cur, key, keyl); + if (r != 0) + return r; + cur->islookup = 1; + while ((r = cur_next(cur)) == 0) + if (keyl == cur->key.len && !memcmp(key, cur->key.kv, keyl)) + break; + cur->islookup = 0; + if (r == 0) + r = cur_getval(cur); + return r; +} + +static int cur_lookup_ge(struct bdb_cur *cur, const unsigned char *key, unsigned int keyl) +{ + int r = -1; + if (cur->db->type == BDB_BTREE) + r = btree_lookup(cur, key, keyl); + if (r != 0) + return r; + cur->islookup = 1; + while ((r = cur_next(cur)) == 0) { + unsigned int ekeyl = cur->key.len; + int cmp = memcmp(cur->key.kv, key, keyl < ekeyl ? keyl : ekeyl); + if (cmp > 0 || (cmp == 0 && ekeyl >= keyl)) + break; + } + cur->islookup = 0; + if (r == 0) + r = cur_getval(cur); + else if (r == 1) + r = cur_next(cur); + return r; +} + +/****** glue code ******/ + +static unsigned int getui32(unsigned char *x, int swapped) +{ + union _dbswap bs; + memcpy(bs.uc, x, 4); + if (swapped) + _DBSWAP(bs); + return bs.ui; +} + +static void setui32(unsigned char *x, uint32_t v, int swapped) +{ + union _dbswap bs; + bs.ui = v; + if (swapped) + _DBSWAP(bs); + memcpy(x, bs.uc, 4); +} + +static void log_error(dbiIndex dbi) +{ + rpmlog(RPMLOG_ERR, "bdb_ro error reading %s database\n", dbi->dbi_file); +} + +static int bdbro_Open(rpmdb rdb, rpmDbiTagVal rpmtag, dbiIndex * dbip, int flags) +{ + const char *dbhome = rpmdbHome(rdb); + dbiIndex dbi = NULL; + char *path; + + if (dbip) + *dbip = NULL; + if ((rdb->db_mode & O_ACCMODE) != O_RDONLY) + return EPERM; + if ((dbi = dbiNew(rdb, rpmtag)) == NULL) + return 1; + path = rstrscat(NULL, dbhome, "/", dbi->dbi_file, NULL); + rpmlog(RPMLOG_DEBUG, "opening db index %s\n", path); + dbi->dbi_db = bdb_open(path); + if (!dbi->dbi_db) { + rpmlog(RPMLOG_ERR, "could not open %s: %s\n", path, strerror(errno)); + free(path); + dbiFree(dbi); + return 1; + } + free(path); + dbi->dbi_flags |= DBI_RDONLY; + if (dbip) + *dbip = dbi; + else + (void) dbiClose(dbi, 0); + return 0; +} + +static int bdbro_Close(dbiIndex dbi, unsigned int flags) +{ + if (dbi->dbi_db) + bdb_close(dbi->dbi_db); + dbiFree(dbi); + return 0; +} + +static int bdbro_Verify(dbiIndex dbi, unsigned int flags) +{ + return 0; +} + +static void bdbro_SetFSync(rpmdb rdb, int enable) +{ +} + +static int bdbro_Ctrl(rpmdb rdb, dbCtrlOp ctrl) +{ + return 0; +} + +static dbiCursor bdbro_CursorInit(dbiIndex dbi, unsigned int flags) +{ + return dbi ? (void *)cur_open(dbi->dbi_db) : NULL; +} + +static dbiCursor bdbro_CursorFree(dbiIndex dbi, dbiCursor dbc) +{ + if (dbc) + cur_close((void *)dbc); + return NULL; +} + +static void appenddbt(dbiCursor dbc, unsigned char *val, unsigned int vallen, dbiIndexSet *setp) +{ + struct bdb_cur *cur = (void *)dbc; + dbiIndexSet set; + unsigned int i; + + set = dbiIndexSetNew(vallen / (2 * sizeof(uint32_t))); + set->count = vallen / (2 * sizeof(uint32_t)); + + for (i = 0; i < set->count; i++, val += 8) { + set->recs[i].hdrNum = getui32(val, cur->db->swapped); + set->recs[i].tagNum = getui32(val + 4, cur->db->swapped); + } + if (*setp == NULL) { + *setp = set; + } else { + dbiIndexSetAppendSet(*setp, set, 0); + dbiIndexSetFree(set); + } +} + +static rpmRC bdbro_idxdbPut(dbiIndex dbi, dbiCursor dbc, const char *keyp, size_t keylen, dbiIndexItem rec) +{ + return RPMRC_FAIL; +} + +static rpmRC bdbro_idxdbDel(dbiIndex dbi, dbiCursor dbc, const char *keyp, size_t keylen, dbiIndexItem rec) +{ + return RPMRC_FAIL; +} + +static rpmRC bdbro_idxdbGet(dbiIndex dbi, dbiCursor dbc, const char *keyp, size_t keylen, + dbiIndexSet *set, int searchType) +{ + struct bdb_cur *cur = (void *)dbc; + int r; + + if (!cur) + return RPMRC_FAIL; + if (searchType == DBC_PREFIX_SEARCH) { + rpmRC rc = RPMRC_NOTFOUND; + if (!keyp) + return RPMRC_FAIL; + r = cur_lookup_ge(cur, (const unsigned char *)keyp, keylen); + for (; r == 0; r = cur_next(cur)) { + if (cur->key.len < keylen || memcmp(cur->key.kv, keyp, keylen) != 0) + break; + if (set) + appenddbt(dbc, cur->val.kv, cur->val.len, set); + rc = RPMRC_OK; + } + if (r == -1) + log_error(dbi); + cur->key.kv = 0; + return r == -1 ? RPMRC_FAIL : rc; + } + if (keyp) { + if (keylen == 0) { + keyp = ""; + keylen = 1; + } + r = cur_lookup(cur, (const unsigned char *)keyp, keylen); + } else { + r = cur_next(cur); + } + if (r == 0) { + if (set) + appenddbt(dbc, cur->val.kv, cur->val.len, set); + return RPMRC_OK; + } + if (r == -1) + log_error(dbi); + cur->key.kv = 0; + return r == 1 ? RPMRC_NOTFOUND : RPMRC_FAIL; +} + +static const void *bdbro_idxdbKey(dbiIndex dbi, dbiCursor dbc, unsigned int *keylen) +{ + struct bdb_cur *cur = (void *)dbc; + if (!cur || !cur->key.kv) + return 0; + if (keylen) + *keylen = cur->key.len; + return cur->key.kv; +} + +static rpmRC bdbro_pkgdbNew(dbiIndex dbi, dbiCursor dbc, unsigned int *hdrNum) +{ + return RPMRC_FAIL; +} + +static rpmRC bdbro_pkgdbPut(dbiIndex dbi, dbiCursor dbc, unsigned int hdrNum, + unsigned char *hdrBlob, unsigned int hdrLen) +{ + return RPMRC_FAIL; +} + +static rpmRC bdbro_pkgdbDel(dbiIndex dbi, dbiCursor dbc, unsigned int hdrNum) +{ + return RPMRC_FAIL; +} + +static rpmRC bdbro_pkgdbGet(dbiIndex dbi, dbiCursor dbc, unsigned int hdrNum, + unsigned char **hdrBlob, unsigned int *hdrLen) +{ + struct bdb_cur *cur = (void *)dbc; + int r; + if (hdrNum) { + unsigned char hdrkey[4]; + setui32(hdrkey, hdrNum, cur->db->swapped); + r = cur_lookup(cur, hdrkey, 4); + } else { + r = cur_next(cur); + } + if (r == 0) { + if (hdrBlob) + *hdrBlob = cur->val.kv; + if (hdrLen) + *hdrLen = cur->val.len; + return RPMRC_OK; + } + if (r == -1) + log_error(dbi); + cur->key.kv = 0; + return r == 1 ? RPMRC_NOTFOUND : RPMRC_FAIL; +} + +static unsigned int bdbro_pkgdbKey(dbiIndex dbi, dbiCursor dbc) +{ + struct bdb_cur *cur = (void *)dbc; + if (!cur || !cur->key.kv || cur->key.len != 4) + return 0; + return getui32(cur->key.kv, cur->db->swapped); +} + +struct rpmdbOps_s bdbro_dbops = { + .open = bdbro_Open, + .close = bdbro_Close, + .verify = bdbro_Verify, + .setFSync = bdbro_SetFSync, + .ctrl = bdbro_Ctrl, + + .cursorInit = bdbro_CursorInit, + .cursorFree = bdbro_CursorFree, + + .pkgdbNew = bdbro_pkgdbNew, + .pkgdbPut = bdbro_pkgdbPut, + .pkgdbDel = bdbro_pkgdbDel, + .pkgdbGet = bdbro_pkgdbGet, + .pkgdbKey = bdbro_pkgdbKey, + + .idxdbGet = bdbro_idxdbGet, + .idxdbPut = bdbro_idxdbPut, + .idxdbDel = bdbro_idxdbDel, + .idxdbKey = bdbro_idxdbKey +}; + --- ./lib/backend/dbi.c.orig 2020-12-09 10:58:30.751995543 +0000 +++ ./lib/backend/dbi.c 2020-12-09 11:05:25.990857243 +0000 @@ -104,6 +104,15 @@ dbDetectBackend(rpmdb rdb) free(path); #endif +#if defined(WITH_BDB_RO) && !defined(WITH_BDB) + path = rstrscat(NULL, dbhome, "/Packages", NULL); + if (access(path, F_OK) == 0 && rdb->db_ops != &bdbro_dbops) { + rdb->db_ops = &bdbro_dbops; + rpmlog(RPMLOG_WARNING, _("Found BDB Packages database while attempting %s backend: using bdb_ro backend.\n"), db_backend); + } + free(path); +#endif + if (db_backend) free(db_backend); } --- ./lib/backend/dbi.h.orig 2020-12-09 10:55:50.304435035 +0000 +++ ./lib/backend/dbi.h 2020-12-09 10:58:30.751995543 +0000 @@ -270,6 +270,11 @@ RPM_GNUC_INTERNAL extern struct rpmdbOps_s db3_dbops; #endif +#if defined(WITH_BDB_RO) +RPM_GNUC_INTERNAL +extern struct rpmdbOps_s bdbro_dbops; +#endif + #ifdef ENABLE_NDB RPM_GNUC_INTERNAL extern struct rpmdbOps_s ndb_dbops;
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