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-rw-r--r--object-file.c1603
1 files changed, 1603 insertions, 0 deletions
diff --git a/object-file.c b/object-file.c
new file mode 100644
index 0000000000..2bc36ab3ee
--- /dev/null
+++ b/object-file.c
@@ -0,0 +1,1603 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ *
+ * This handles basic git object files - packing, unpacking,
+ * creation etc.
+ */
+
+#define USE_THE_REPOSITORY_VARIABLE
+
+#include "git-compat-util.h"
+#include "bulk-checkin.h"
+#include "convert.h"
+#include "dir.h"
+#include "environment.h"
+#include "fsck.h"
+#include "gettext.h"
+#include "hex.h"
+#include "loose.h"
+#include "object-file-convert.h"
+#include "object-file.h"
+#include "odb.h"
+#include "oidtree.h"
+#include "pack.h"
+#include "packfile.h"
+#include "path.h"
+#include "read-cache-ll.h"
+#include "setup.h"
+#include "streaming.h"
+
+/* The maximum size for an object header. */
+#define MAX_HEADER_LEN 32
+
+static int get_conv_flags(unsigned flags)
+{
+ if (flags & INDEX_RENORMALIZE)
+ return CONV_EOL_RENORMALIZE;
+ else if (flags & INDEX_WRITE_OBJECT)
+ return global_conv_flags_eol | CONV_WRITE_OBJECT;
+ else
+ return 0;
+}
+
+static void fill_loose_path(struct strbuf *buf,
+ const struct object_id *oid,
+ const struct git_hash_algo *algop)
+{
+ for (size_t i = 0; i < algop->rawsz; i++) {
+ static char hex[] = "0123456789abcdef";
+ unsigned int val = oid->hash[i];
+ strbuf_addch(buf, hex[val >> 4]);
+ strbuf_addch(buf, hex[val & 0xf]);
+ if (!i)
+ strbuf_addch(buf, '/');
+ }
+}
+
+const char *odb_loose_path(struct odb_source *source,
+ struct strbuf *buf,
+ const struct object_id *oid)
+{
+ strbuf_reset(buf);
+ strbuf_addstr(buf, source->path);
+ strbuf_addch(buf, '/');
+ fill_loose_path(buf, oid, source->odb->repo->hash_algo);
+ return buf->buf;
+}
+
+/* Returns 1 if we have successfully freshened the file, 0 otherwise. */
+static int freshen_file(const char *fn)
+{
+ return !utime(fn, NULL);
+}
+
+/*
+ * All of the check_and_freshen functions return 1 if the file exists and was
+ * freshened (if freshening was requested), 0 otherwise. If they return
+ * 0, you should not assume that it is safe to skip a write of the object (it
+ * either does not exist on disk, or has a stale mtime and may be subject to
+ * pruning).
+ */
+int check_and_freshen_file(const char *fn, int freshen)
+{
+ if (access(fn, F_OK))
+ return 0;
+ if (freshen && !freshen_file(fn))
+ return 0;
+ return 1;
+}
+
+static int check_and_freshen_source(struct odb_source *source,
+ const struct object_id *oid,
+ int freshen)
+{
+ static struct strbuf path = STRBUF_INIT;
+ odb_loose_path(source, &path, oid);
+ return check_and_freshen_file(path.buf, freshen);
+}
+
+int has_loose_object(struct odb_source *source,
+ const struct object_id *oid)
+{
+ return check_and_freshen_source(source, oid, 0);
+}
+
+int format_object_header(char *str, size_t size, enum object_type type,
+ size_t objsize)
+{
+ const char *name = type_name(type);
+
+ if (!name)
+ BUG("could not get a type name for 'enum object_type' value %d", type);
+
+ return xsnprintf(str, size, "%s %"PRIuMAX, name, (uintmax_t)objsize) + 1;
+}
+
+int check_object_signature(struct repository *r, const struct object_id *oid,
+ void *buf, unsigned long size,
+ enum object_type type)
+{
+ const struct git_hash_algo *algo =
+ oid->algo ? &hash_algos[oid->algo] : r->hash_algo;
+ struct object_id real_oid;
+
+ hash_object_file(algo, buf, size, type, &real_oid);
+
+ return !oideq(oid, &real_oid) ? -1 : 0;
+}
+
+int stream_object_signature(struct repository *r, const struct object_id *oid)
+{
+ struct object_id real_oid;
+ unsigned long size;
+ enum object_type obj_type;
+ struct git_istream *st;
+ struct git_hash_ctx c;
+ char hdr[MAX_HEADER_LEN];
+ int hdrlen;
+
+ st = open_istream(r, oid, &obj_type, &size, NULL);
+ if (!st)
+ return -1;
+
+ /* Generate the header */
+ hdrlen = format_object_header(hdr, sizeof(hdr), obj_type, size);
+
+ /* Sha1.. */
+ r->hash_algo->init_fn(&c);
+ git_hash_update(&c, hdr, hdrlen);
+ for (;;) {
+ char buf[1024 * 16];
+ ssize_t readlen = read_istream(st, buf, sizeof(buf));
+
+ if (readlen < 0) {
+ close_istream(st);
+ return -1;
+ }
+ if (!readlen)
+ break;
+ git_hash_update(&c, buf, readlen);
+ }
+ git_hash_final_oid(&real_oid, &c);
+ close_istream(st);
+ return !oideq(oid, &real_oid) ? -1 : 0;
+}
+
+/*
+ * Find "oid" as a loose object in the local repository or in an alternate.
+ * Returns 0 on success, negative on failure.
+ *
+ * The "path" out-parameter will give the path of the object we found (if any).
+ * Note that it may point to static storage and is only valid until another
+ * call to stat_loose_object().
+ */
+static int stat_loose_object(struct repository *r, const struct object_id *oid,
+ struct stat *st, const char **path)
+{
+ struct odb_source *source;
+ static struct strbuf buf = STRBUF_INIT;
+
+ odb_prepare_alternates(r->objects);
+ for (source = r->objects->sources; source; source = source->next) {
+ *path = odb_loose_path(source, &buf, oid);
+ if (!lstat(*path, st))
+ return 0;
+ }
+
+ return -1;
+}
+
+/*
+ * Like stat_loose_object(), but actually open the object and return the
+ * descriptor. See the caveats on the "path" parameter above.
+ */
+static int open_loose_object(struct repository *r,
+ const struct object_id *oid, const char **path)
+{
+ int fd;
+ struct odb_source *source;
+ int most_interesting_errno = ENOENT;
+ static struct strbuf buf = STRBUF_INIT;
+
+ odb_prepare_alternates(r->objects);
+ for (source = r->objects->sources; source; source = source->next) {
+ *path = odb_loose_path(source, &buf, oid);
+ fd = git_open(*path);
+ if (fd >= 0)
+ return fd;
+
+ if (most_interesting_errno == ENOENT)
+ most_interesting_errno = errno;
+ }
+ errno = most_interesting_errno;
+ return -1;
+}
+
+static int quick_has_loose(struct repository *r,
+ const struct object_id *oid)
+{
+ struct odb_source *source;
+
+ odb_prepare_alternates(r->objects);
+ for (source = r->objects->sources; source; source = source->next) {
+ if (oidtree_contains(odb_loose_cache(source, oid), oid))
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Map and close the given loose object fd. The path argument is used for
+ * error reporting.
+ */
+static void *map_fd(int fd, const char *path, unsigned long *size)
+{
+ void *map = NULL;
+ struct stat st;
+
+ if (!fstat(fd, &st)) {
+ *size = xsize_t(st.st_size);
+ if (!*size) {
+ /* mmap() is forbidden on empty files */
+ error(_("object file %s is empty"), path);
+ close(fd);
+ return NULL;
+ }
+ map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
+ }
+ close(fd);
+ return map;
+}
+
+void *map_loose_object(struct repository *r,
+ const struct object_id *oid,
+ unsigned long *size)
+{
+ const char *p;
+ int fd = open_loose_object(r, oid, &p);
+
+ if (fd < 0)
+ return NULL;
+ return map_fd(fd, p, size);
+}
+
+enum unpack_loose_header_result unpack_loose_header(git_zstream *stream,
+ unsigned char *map,
+ unsigned long mapsize,
+ void *buffer,
+ unsigned long bufsiz)
+{
+ int status;
+
+ /* Get the data stream */
+ memset(stream, 0, sizeof(*stream));
+ stream->next_in = map;
+ stream->avail_in = mapsize;
+ stream->next_out = buffer;
+ stream->avail_out = bufsiz;
+
+ git_inflate_init(stream);
+ obj_read_unlock();
+ status = git_inflate(stream, 0);
+ obj_read_lock();
+ if (status != Z_OK && status != Z_STREAM_END)
+ return ULHR_BAD;
+
+ /*
+ * Check if entire header is unpacked in the first iteration.
+ */
+ if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
+ return ULHR_OK;
+
+ /*
+ * We have a header longer than MAX_HEADER_LEN.
+ */
+ return ULHR_TOO_LONG;
+}
+
+static void *unpack_loose_rest(git_zstream *stream,
+ void *buffer, unsigned long size,
+ const struct object_id *oid)
+{
+ size_t bytes = strlen(buffer) + 1, n;
+ unsigned char *buf = xmallocz(size);
+ int status = Z_OK;
+
+ n = stream->total_out - bytes;
+ if (n > size)
+ n = size;
+ memcpy(buf, (char *) buffer + bytes, n);
+ bytes = n;
+ if (bytes <= size) {
+ /*
+ * The above condition must be (bytes <= size), not
+ * (bytes < size). In other words, even though we
+ * expect no more output and set avail_out to zero,
+ * the input zlib stream may have bytes that express
+ * "this concludes the stream", and we *do* want to
+ * eat that input.
+ *
+ * Otherwise we would not be able to test that we
+ * consumed all the input to reach the expected size;
+ * we also want to check that zlib tells us that all
+ * went well with status == Z_STREAM_END at the end.
+ */
+ stream->next_out = buf + bytes;
+ stream->avail_out = size - bytes;
+ while (status == Z_OK) {
+ obj_read_unlock();
+ status = git_inflate(stream, Z_FINISH);
+ obj_read_lock();
+ }
+ }
+
+ if (status != Z_STREAM_END) {
+ error(_("corrupt loose object '%s'"), oid_to_hex(oid));
+ FREE_AND_NULL(buf);
+ } else if (stream->avail_in) {
+ error(_("garbage at end of loose object '%s'"),
+ oid_to_hex(oid));
+ FREE_AND_NULL(buf);
+ }
+
+ return buf;
+}
+
+/*
+ * We used to just use "sscanf()", but that's actually way
+ * too permissive for what we want to check. So do an anal
+ * object header parse by hand.
+ */
+int parse_loose_header(const char *hdr, struct object_info *oi)
+{
+ const char *type_buf = hdr;
+ size_t size;
+ int type, type_len = 0;
+
+ /*
+ * The type can be of any size but is followed by
+ * a space.
+ */
+ for (;;) {
+ char c = *hdr++;
+ if (!c)
+ return -1;
+ if (c == ' ')
+ break;
+ type_len++;
+ }
+
+ type = type_from_string_gently(type_buf, type_len, 1);
+ if (oi->typep)
+ *oi->typep = type;
+
+ /*
+ * The length must follow immediately, and be in canonical
+ * decimal format (ie "010" is not valid).
+ */
+ size = *hdr++ - '0';
+ if (size > 9)
+ return -1;
+ if (size) {
+ for (;;) {
+ unsigned long c = *hdr - '0';
+ if (c > 9)
+ break;
+ hdr++;
+ size = st_add(st_mult(size, 10), c);
+ }
+ }
+
+ if (oi->sizep)
+ *oi->sizep = cast_size_t_to_ulong(size);
+
+ /*
+ * The length must be followed by a zero byte
+ */
+ if (*hdr)
+ return -1;
+
+ /*
+ * The format is valid, but the type may still be bogus. The
+ * Caller needs to check its oi->typep.
+ */
+ return 0;
+}
+
+int loose_object_info(struct repository *r,
+ const struct object_id *oid,
+ struct object_info *oi, int flags)
+{
+ int status = 0;
+ int fd;
+ unsigned long mapsize;
+ const char *path;
+ void *map;
+ git_zstream stream;
+ char hdr[MAX_HEADER_LEN];
+ unsigned long size_scratch;
+ enum object_type type_scratch;
+
+ if (oi->delta_base_oid)
+ oidclr(oi->delta_base_oid, r->hash_algo);
+
+ /*
+ * If we don't care about type or size, then we don't
+ * need to look inside the object at all. Note that we
+ * do not optimize out the stat call, even if the
+ * caller doesn't care about the disk-size, since our
+ * return value implicitly indicates whether the
+ * object even exists.
+ */
+ if (!oi->typep && !oi->sizep && !oi->contentp) {
+ struct stat st;
+ if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK))
+ return quick_has_loose(r, oid) ? 0 : -1;
+ if (stat_loose_object(r, oid, &st, &path) < 0)
+ return -1;
+ if (oi->disk_sizep)
+ *oi->disk_sizep = st.st_size;
+ return 0;
+ }
+
+ fd = open_loose_object(r, oid, &path);
+ if (fd < 0) {
+ if (errno != ENOENT)
+ error_errno(_("unable to open loose object %s"), oid_to_hex(oid));
+ return -1;
+ }
+ map = map_fd(fd, path, &mapsize);
+ if (!map)
+ return -1;
+
+ if (!oi->sizep)
+ oi->sizep = &size_scratch;
+ if (!oi->typep)
+ oi->typep = &type_scratch;
+
+ if (oi->disk_sizep)
+ *oi->disk_sizep = mapsize;
+
+ switch (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr))) {
+ case ULHR_OK:
+ if (parse_loose_header(hdr, oi) < 0)
+ status = error(_("unable to parse %s header"), oid_to_hex(oid));
+ else if (*oi->typep < 0)
+ die(_("invalid object type"));
+
+ if (!oi->contentp)
+ break;
+ *oi->contentp = unpack_loose_rest(&stream, hdr, *oi->sizep, oid);
+ if (*oi->contentp)
+ goto cleanup;
+
+ status = -1;
+ break;
+ case ULHR_BAD:
+ status = error(_("unable to unpack %s header"),
+ oid_to_hex(oid));
+ break;
+ case ULHR_TOO_LONG:
+ status = error(_("header for %s too long, exceeds %d bytes"),
+ oid_to_hex(oid), MAX_HEADER_LEN);
+ break;
+ }
+
+ if (status && (flags & OBJECT_INFO_DIE_IF_CORRUPT))
+ die(_("loose object %s (stored in %s) is corrupt"),
+ oid_to_hex(oid), path);
+
+cleanup:
+ git_inflate_end(&stream);
+ munmap(map, mapsize);
+ if (oi->sizep == &size_scratch)
+ oi->sizep = NULL;
+ if (oi->typep == &type_scratch)
+ oi->typep = NULL;
+ oi->whence = OI_LOOSE;
+ return status;
+}
+
+static void hash_object_body(const struct git_hash_algo *algo, struct git_hash_ctx *c,
+ const void *buf, unsigned long len,
+ struct object_id *oid,
+ char *hdr, int *hdrlen)
+{
+ algo->init_fn(c);
+ git_hash_update(c, hdr, *hdrlen);
+ git_hash_update(c, buf, len);
+ git_hash_final_oid(oid, c);
+}
+
+static void write_object_file_prepare(const struct git_hash_algo *algo,
+ const void *buf, unsigned long len,
+ enum object_type type, struct object_id *oid,
+ char *hdr, int *hdrlen)
+{
+ struct git_hash_ctx c;
+
+ /* Generate the header */
+ *hdrlen = format_object_header(hdr, *hdrlen, type, len);
+
+ /* Sha1.. */
+ hash_object_body(algo, &c, buf, len, oid, hdr, hdrlen);
+}
+
+#define CHECK_COLLISION_DEST_VANISHED -2
+
+static int check_collision(const char *source, const char *dest)
+{
+ char buf_source[4096], buf_dest[4096];
+ int fd_source = -1, fd_dest = -1;
+ int ret = 0;
+
+ fd_source = open(source, O_RDONLY);
+ if (fd_source < 0) {
+ ret = error_errno(_("unable to open %s"), source);
+ goto out;
+ }
+
+ fd_dest = open(dest, O_RDONLY);
+ if (fd_dest < 0) {
+ if (errno != ENOENT)
+ ret = error_errno(_("unable to open %s"), dest);
+ else
+ ret = CHECK_COLLISION_DEST_VANISHED;
+ goto out;
+ }
+
+ while (1) {
+ ssize_t sz_a, sz_b;
+
+ sz_a = read_in_full(fd_source, buf_source, sizeof(buf_source));
+ if (sz_a < 0) {
+ ret = error_errno(_("unable to read %s"), source);
+ goto out;
+ }
+
+ sz_b = read_in_full(fd_dest, buf_dest, sizeof(buf_dest));
+ if (sz_b < 0) {
+ ret = error_errno(_("unable to read %s"), dest);
+ goto out;
+ }
+
+ if (sz_a != sz_b || memcmp(buf_source, buf_dest, sz_a)) {
+ ret = error(_("files '%s' and '%s' differ in contents"),
+ source, dest);
+ goto out;
+ }
+
+ if ((size_t) sz_a < sizeof(buf_source))
+ break;
+ }
+
+out:
+ if (fd_source > -1)
+ close(fd_source);
+ if (fd_dest > -1)
+ close(fd_dest);
+ return ret;
+}
+
+/*
+ * Move the just written object into its final resting place.
+ */
+int finalize_object_file(struct repository *repo,
+ const char *tmpfile, const char *filename)
+{
+ return finalize_object_file_flags(repo, tmpfile, filename, 0);
+}
+
+int finalize_object_file_flags(struct repository *repo,
+ const char *tmpfile, const char *filename,
+ enum finalize_object_file_flags flags)
+{
+ unsigned retries = 0;
+ int ret;
+
+retry:
+ ret = 0;
+
+ if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
+ goto try_rename;
+ else if (link(tmpfile, filename))
+ ret = errno;
+ else
+ unlink_or_warn(tmpfile);
+
+ /*
+ * Coda hack - coda doesn't like cross-directory links,
+ * so we fall back to a rename, which will mean that it
+ * won't be able to check collisions, but that's not a
+ * big deal.
+ *
+ * The same holds for FAT formatted media.
+ *
+ * When this succeeds, we just return. We have nothing
+ * left to unlink.
+ */
+ if (ret && ret != EEXIST) {
+ struct stat st;
+
+ try_rename:
+ if (!stat(filename, &st))
+ ret = EEXIST;
+ else if (!rename(tmpfile, filename))
+ goto out;
+ else
+ ret = errno;
+ }
+ if (ret) {
+ if (ret != EEXIST) {
+ int saved_errno = errno;
+ unlink_or_warn(tmpfile);
+ errno = saved_errno;
+ return error_errno(_("unable to write file %s"), filename);
+ }
+ if (!(flags & FOF_SKIP_COLLISION_CHECK)) {
+ ret = check_collision(tmpfile, filename);
+ if (ret == CHECK_COLLISION_DEST_VANISHED) {
+ if (retries++ > 5)
+ return error(_("unable to write repeatedly vanishing file %s"),
+ filename);
+ goto retry;
+ }
+ else if (ret)
+ return -1;
+ }
+ unlink_or_warn(tmpfile);
+ }
+
+out:
+ if (adjust_shared_perm(repo, filename))
+ return error(_("unable to set permission to '%s'"), filename);
+ return 0;
+}
+
+void hash_object_file(const struct git_hash_algo *algo, const void *buf,
+ unsigned long len, enum object_type type,
+ struct object_id *oid)
+{
+ char hdr[MAX_HEADER_LEN];
+ int hdrlen = sizeof(hdr);
+
+ write_object_file_prepare(algo, buf, len, type, oid, hdr, &hdrlen);
+}
+
+/* Finalize a file on disk, and close it. */
+static void close_loose_object(struct odb_source *source,
+ int fd, const char *filename)
+{
+ if (source->will_destroy)
+ goto out;
+
+ if (batch_fsync_enabled(FSYNC_COMPONENT_LOOSE_OBJECT))
+ fsync_loose_object_bulk_checkin(fd, filename);
+ else if (fsync_object_files > 0)
+ fsync_or_die(fd, filename);
+ else
+ fsync_component_or_die(FSYNC_COMPONENT_LOOSE_OBJECT, fd,
+ filename);
+
+out:
+ if (close(fd) != 0)
+ die_errno(_("error when closing loose object file"));
+}
+
+/* Size of directory component, including the ending '/' */
+static inline int directory_size(const char *filename)
+{
+ const char *s = strrchr(filename, '/');
+ if (!s)
+ return 0;
+ return s - filename + 1;
+}
+
+/*
+ * This creates a temporary file in the same directory as the final
+ * 'filename'
+ *
+ * We want to avoid cross-directory filename renames, because those
+ * can have problems on various filesystems (FAT, NFS, Coda).
+ */
+static int create_tmpfile(struct repository *repo,
+ struct strbuf *tmp, const char *filename)
+{
+ int fd, dirlen = directory_size(filename);
+
+ strbuf_reset(tmp);
+ strbuf_add(tmp, filename, dirlen);
+ strbuf_addstr(tmp, "tmp_obj_XXXXXX");
+ fd = git_mkstemp_mode(tmp->buf, 0444);
+ if (fd < 0 && dirlen && errno == ENOENT) {
+ /*
+ * Make sure the directory exists; note that the contents
+ * of the buffer are undefined after mkstemp returns an
+ * error, so we have to rewrite the whole buffer from
+ * scratch.
+ */
+ strbuf_reset(tmp);
+ strbuf_add(tmp, filename, dirlen - 1);
+ if (mkdir(tmp->buf, 0777) && errno != EEXIST)
+ return -1;
+ if (adjust_shared_perm(repo, tmp->buf))
+ return -1;
+
+ /* Try again */
+ strbuf_addstr(tmp, "/tmp_obj_XXXXXX");
+ fd = git_mkstemp_mode(tmp->buf, 0444);
+ }
+ return fd;
+}
+
+/**
+ * Common steps for loose object writers to start writing loose
+ * objects:
+ *
+ * - Create tmpfile for the loose object.
+ * - Setup zlib stream for compression.
+ * - Start to feed header to zlib stream.
+ *
+ * Returns a "fd", which should later be provided to
+ * end_loose_object_common().
+ */
+static int start_loose_object_common(struct odb_source *source,
+ struct strbuf *tmp_file,
+ const char *filename, unsigned flags,
+ git_zstream *stream,
+ unsigned char *buf, size_t buflen,
+ struct git_hash_ctx *c, struct git_hash_ctx *compat_c,
+ char *hdr, int hdrlen)
+{
+ const struct git_hash_algo *algo = source->odb->repo->hash_algo;
+ const struct git_hash_algo *compat = source->odb->repo->compat_hash_algo;
+ int fd;
+
+ fd = create_tmpfile(source->odb->repo, tmp_file, filename);
+ if (fd < 0) {
+ if (flags & WRITE_OBJECT_SILENT)
+ return -1;
+ else if (errno == EACCES)
+ return error(_("insufficient permission for adding "
+ "an object to repository database %s"),
+ source->path);
+ else
+ return error_errno(
+ _("unable to create temporary file"));
+ }
+
+ /* Setup zlib stream for compression */
+ git_deflate_init(stream, zlib_compression_level);
+ stream->next_out = buf;
+ stream->avail_out = buflen;
+ algo->init_fn(c);
+ if (compat && compat_c)
+ compat->init_fn(compat_c);
+
+ /* Start to feed header to zlib stream */
+ stream->next_in = (unsigned char *)hdr;
+ stream->avail_in = hdrlen;
+ while (git_deflate(stream, 0) == Z_OK)
+ ; /* nothing */
+ git_hash_update(c, hdr, hdrlen);
+ if (compat && compat_c)
+ git_hash_update(compat_c, hdr, hdrlen);
+
+ return fd;
+}
+
+/**
+ * Common steps for the inner git_deflate() loop for writing loose
+ * objects. Returns what git_deflate() returns.
+ */
+static int write_loose_object_common(struct odb_source *source,
+ struct git_hash_ctx *c, struct git_hash_ctx *compat_c,
+ git_zstream *stream, const int flush,
+ unsigned char *in0, const int fd,
+ unsigned char *compressed,
+ const size_t compressed_len)
+{
+ const struct git_hash_algo *compat = source->odb->repo->compat_hash_algo;
+ int ret;
+
+ ret = git_deflate(stream, flush ? Z_FINISH : 0);
+ git_hash_update(c, in0, stream->next_in - in0);
+ if (compat && compat_c)
+ git_hash_update(compat_c, in0, stream->next_in - in0);
+ if (write_in_full(fd, compressed, stream->next_out - compressed) < 0)
+ die_errno(_("unable to write loose object file"));
+ stream->next_out = compressed;
+ stream->avail_out = compressed_len;
+
+ return ret;
+}
+
+/**
+ * Common steps for loose object writers to end writing loose objects:
+ *
+ * - End the compression of zlib stream.
+ * - Get the calculated oid to "oid".
+ */
+static int end_loose_object_common(struct odb_source *source,
+ struct git_hash_ctx *c, struct git_hash_ctx *compat_c,
+ git_zstream *stream, struct object_id *oid,
+ struct object_id *compat_oid)
+{
+ const struct git_hash_algo *compat = source->odb->repo->compat_hash_algo;
+ int ret;
+
+ ret = git_deflate_end_gently(stream);
+ if (ret != Z_OK)
+ return ret;
+ git_hash_final_oid(oid, c);
+ if (compat && compat_c)
+ git_hash_final_oid(compat_oid, compat_c);
+
+ return Z_OK;
+}
+
+static int write_loose_object(struct odb_source *source,
+ const struct object_id *oid, char *hdr,
+ int hdrlen, const void *buf, unsigned long len,
+ time_t mtime, unsigned flags)
+{
+ int fd, ret;
+ unsigned char compressed[4096];
+ git_zstream stream;
+ struct git_hash_ctx c;
+ struct object_id parano_oid;
+ static struct strbuf tmp_file = STRBUF_INIT;
+ static struct strbuf filename = STRBUF_INIT;
+
+ if (batch_fsync_enabled(FSYNC_COMPONENT_LOOSE_OBJECT))
+ prepare_loose_object_bulk_checkin();
+
+ odb_loose_path(source, &filename, oid);
+
+ fd = start_loose_object_common(source, &tmp_file, filename.buf, flags,
+ &stream, compressed, sizeof(compressed),
+ &c, NULL, hdr, hdrlen);
+ if (fd < 0)
+ return -1;
+
+ /* Then the data itself.. */
+ stream.next_in = (void *)buf;
+ stream.avail_in = len;
+ do {
+ unsigned char *in0 = stream.next_in;
+
+ ret = write_loose_object_common(source, &c, NULL, &stream, 1, in0, fd,
+ compressed, sizeof(compressed));
+ } while (ret == Z_OK);
+
+ if (ret != Z_STREAM_END)
+ die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid),
+ ret);
+ ret = end_loose_object_common(source, &c, NULL, &stream, &parano_oid, NULL);
+ if (ret != Z_OK)
+ die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid),
+ ret);
+ if (!oideq(oid, &parano_oid))
+ die(_("confused by unstable object source data for %s"),
+ oid_to_hex(oid));
+
+ close_loose_object(source, fd, tmp_file.buf);
+
+ if (mtime) {
+ struct utimbuf utb;
+ utb.actime = mtime;
+ utb.modtime = mtime;
+ if (utime(tmp_file.buf, &utb) < 0 &&
+ !(flags & WRITE_OBJECT_SILENT))
+ warning_errno(_("failed utime() on %s"), tmp_file.buf);
+ }
+
+ return finalize_object_file_flags(source->odb->repo, tmp_file.buf, filename.buf,
+ FOF_SKIP_COLLISION_CHECK);
+}
+
+static int freshen_loose_object(struct object_database *odb,
+ const struct object_id *oid)
+{
+ odb_prepare_alternates(odb);
+ for (struct odb_source *source = odb->sources; source; source = source->next)
+ if (check_and_freshen_source(source, oid, 1))
+ return 1;
+ return 0;
+}
+
+static int freshen_packed_object(struct object_database *odb,
+ const struct object_id *oid)
+{
+ struct pack_entry e;
+ if (!find_pack_entry(odb->repo, oid, &e))
+ return 0;
+ if (e.p->is_cruft)
+ return 0;
+ if (e.p->freshened)
+ return 1;
+ if (!freshen_file(e.p->pack_name))
+ return 0;
+ e.p->freshened = 1;
+ return 1;
+}
+
+int stream_loose_object(struct odb_source *source,
+ struct input_stream *in_stream, size_t len,
+ struct object_id *oid)
+{
+ const struct git_hash_algo *compat = source->odb->repo->compat_hash_algo;
+ struct object_id compat_oid;
+ int fd, ret, err = 0, flush = 0;
+ unsigned char compressed[4096];
+ git_zstream stream;
+ struct git_hash_ctx c, compat_c;
+ struct strbuf tmp_file = STRBUF_INIT;
+ struct strbuf filename = STRBUF_INIT;
+ int dirlen;
+ char hdr[MAX_HEADER_LEN];
+ int hdrlen;
+
+ if (batch_fsync_enabled(FSYNC_COMPONENT_LOOSE_OBJECT))
+ prepare_loose_object_bulk_checkin();
+
+ /* Since oid is not determined, save tmp file to odb path. */
+ strbuf_addf(&filename, "%s/", source->path);
+ hdrlen = format_object_header(hdr, sizeof(hdr), OBJ_BLOB, len);
+
+ /*
+ * Common steps for write_loose_object and stream_loose_object to
+ * start writing loose objects:
+ *
+ * - Create tmpfile for the loose object.
+ * - Setup zlib stream for compression.
+ * - Start to feed header to zlib stream.
+ */
+ fd = start_loose_object_common(source, &tmp_file, filename.buf, 0,
+ &stream, compressed, sizeof(compressed),
+ &c, &compat_c, hdr, hdrlen);
+ if (fd < 0) {
+ err = -1;
+ goto cleanup;
+ }
+
+ /* Then the data itself.. */
+ do {
+ unsigned char *in0 = stream.next_in;
+
+ if (!stream.avail_in && !in_stream->is_finished) {
+ const void *in = in_stream->read(in_stream, &stream.avail_in);
+ stream.next_in = (void *)in;
+ in0 = (unsigned char *)in;
+ /* All data has been read. */
+ if (in_stream->is_finished)
+ flush = 1;
+ }
+ ret = write_loose_object_common(source, &c, &compat_c, &stream, flush, in0, fd,
+ compressed, sizeof(compressed));
+ /*
+ * Unlike write_loose_object(), we do not have the entire
+ * buffer. If we get Z_BUF_ERROR due to too few input bytes,
+ * then we'll replenish them in the next input_stream->read()
+ * call when we loop.
+ */
+ } while (ret == Z_OK || ret == Z_BUF_ERROR);
+
+ if (stream.total_in != len + hdrlen)
+ die(_("write stream object %ld != %"PRIuMAX), stream.total_in,
+ (uintmax_t)len + hdrlen);
+
+ /*
+ * Common steps for write_loose_object and stream_loose_object to
+ * end writing loose object:
+ *
+ * - End the compression of zlib stream.
+ * - Get the calculated oid.
+ */
+ if (ret != Z_STREAM_END)
+ die(_("unable to stream deflate new object (%d)"), ret);
+ ret = end_loose_object_common(source, &c, &compat_c, &stream, oid, &compat_oid);
+ if (ret != Z_OK)
+ die(_("deflateEnd on stream object failed (%d)"), ret);
+ close_loose_object(source, fd, tmp_file.buf);
+
+ if (freshen_packed_object(source->odb, oid) ||
+ freshen_loose_object(source->odb, oid)) {
+ unlink_or_warn(tmp_file.buf);
+ goto cleanup;
+ }
+
+ odb_loose_path(source, &filename, oid);
+
+ /* We finally know the object path, and create the missing dir. */
+ dirlen = directory_size(filename.buf);
+ if (dirlen) {
+ struct strbuf dir = STRBUF_INIT;
+ strbuf_add(&dir, filename.buf, dirlen);
+
+ if (safe_create_dir_in_gitdir(source->odb->repo, dir.buf) &&
+ errno != EEXIST) {
+ err = error_errno(_("unable to create directory %s"), dir.buf);
+ strbuf_release(&dir);
+ goto cleanup;
+ }
+ strbuf_release(&dir);
+ }
+
+ err = finalize_object_file_flags(source->odb->repo, tmp_file.buf, filename.buf,
+ FOF_SKIP_COLLISION_CHECK);
+ if (!err && compat)
+ err = repo_add_loose_object_map(source, oid, &compat_oid);
+cleanup:
+ strbuf_release(&tmp_file);
+ strbuf_release(&filename);
+ return err;
+}
+
+int write_object_file(struct odb_source *source,
+ const void *buf, unsigned long len,
+ enum object_type type, struct object_id *oid,
+ struct object_id *compat_oid_in, unsigned flags)
+{
+ const struct git_hash_algo *algo = source->odb->repo->hash_algo;
+ const struct git_hash_algo *compat = source->odb->repo->compat_hash_algo;
+ struct object_id compat_oid;
+ char hdr[MAX_HEADER_LEN];
+ int hdrlen = sizeof(hdr);
+
+ /* Generate compat_oid */
+ if (compat) {
+ if (compat_oid_in)
+ oidcpy(&compat_oid, compat_oid_in);
+ else if (type == OBJ_BLOB)
+ hash_object_file(compat, buf, len, type, &compat_oid);
+ else {
+ struct strbuf converted = STRBUF_INIT;
+ convert_object_file(source->odb->repo, &converted, algo, compat,
+ buf, len, type, 0);
+ hash_object_file(compat, converted.buf, converted.len,
+ type, &compat_oid);
+ strbuf_release(&converted);
+ }
+ }
+
+ /* Normally if we have it in the pack then we do not bother writing
+ * it out into .git/objects/??/?{38} file.
+ */
+ write_object_file_prepare(algo, buf, len, type, oid, hdr, &hdrlen);
+ if (freshen_packed_object(source->odb, oid) ||
+ freshen_loose_object(source->odb, oid))
+ return 0;
+ if (write_loose_object(source, oid, hdr, hdrlen, buf, len, 0, flags))
+ return -1;
+ if (compat)
+ return repo_add_loose_object_map(source, oid, &compat_oid);
+ return 0;
+}
+
+int force_object_loose(struct odb_source *source,
+ const struct object_id *oid, time_t mtime)
+{
+ const struct git_hash_algo *compat = source->odb->repo->compat_hash_algo;
+ void *buf;
+ unsigned long len;
+ struct object_info oi = OBJECT_INFO_INIT;
+ struct object_id compat_oid;
+ enum object_type type;
+ char hdr[MAX_HEADER_LEN];
+ int hdrlen;
+ int ret;
+
+ for (struct odb_source *s = source->odb->sources; s; s = s->next)
+ if (has_loose_object(s, oid))
+ return 0;
+
+ oi.typep = &type;
+ oi.sizep = &len;
+ oi.contentp = &buf;
+ if (odb_read_object_info_extended(source->odb, oid, &oi, 0))
+ return error(_("cannot read object for %s"), oid_to_hex(oid));
+ if (compat) {
+ if (repo_oid_to_algop(source->odb->repo, oid, compat, &compat_oid))
+ return error(_("cannot map object %s to %s"),
+ oid_to_hex(oid), compat->name);
+ }
+ hdrlen = format_object_header(hdr, sizeof(hdr), type, len);
+ ret = write_loose_object(source, oid, hdr, hdrlen, buf, len, mtime, 0);
+ if (!ret && compat)
+ ret = repo_add_loose_object_map(source, oid, &compat_oid);
+ free(buf);
+
+ return ret;
+}
+
+/*
+ * We can't use the normal fsck_error_function() for index_mem(),
+ * because we don't yet have a valid oid for it to report. Instead,
+ * report the minimal fsck error here, and rely on the caller to
+ * give more context.
+ */
+static int hash_format_check_report(struct fsck_options *opts UNUSED,
+ void *fsck_report UNUSED,
+ enum fsck_msg_type msg_type UNUSED,
+ enum fsck_msg_id msg_id UNUSED,
+ const char *message)
+{
+ error(_("object fails fsck: %s"), message);
+ return 1;
+}
+
+static int index_mem(struct index_state *istate,
+ struct object_id *oid,
+ const void *buf, size_t size,
+ enum object_type type,
+ const char *path, unsigned flags)
+{
+ struct strbuf nbuf = STRBUF_INIT;
+ int ret = 0;
+ int write_object = flags & INDEX_WRITE_OBJECT;
+
+ if (!type)
+ type = OBJ_BLOB;
+
+ /*
+ * Convert blobs to git internal format
+ */
+ if ((type == OBJ_BLOB) && path) {
+ if (convert_to_git(istate, path, buf, size, &nbuf,
+ get_conv_flags(flags))) {
+ buf = nbuf.buf;
+ size = nbuf.len;
+ }
+ }
+ if (flags & INDEX_FORMAT_CHECK) {
+ struct fsck_options opts = FSCK_OPTIONS_DEFAULT;
+
+ opts.strict = 1;
+ opts.error_func = hash_format_check_report;
+ if (fsck_buffer(null_oid(istate->repo->hash_algo), type, buf, size, &opts))
+ die(_("refusing to create malformed object"));
+ fsck_finish(&opts);
+ }
+
+ if (write_object)
+ ret = odb_write_object(istate->repo->objects, buf, size, type, oid);
+ else
+ hash_object_file(istate->repo->hash_algo, buf, size, type, oid);
+
+ strbuf_release(&nbuf);
+ return ret;
+}
+
+static int index_stream_convert_blob(struct index_state *istate,
+ struct object_id *oid,
+ int fd,
+ const char *path,
+ unsigned flags)
+{
+ int ret = 0;
+ const int write_object = flags & INDEX_WRITE_OBJECT;
+ struct strbuf sbuf = STRBUF_INIT;
+
+ assert(path);
+ ASSERT(would_convert_to_git_filter_fd(istate, path));
+
+ convert_to_git_filter_fd(istate, path, fd, &sbuf,
+ get_conv_flags(flags));
+
+ if (write_object)
+ ret = odb_write_object(istate->repo->objects, sbuf.buf, sbuf.len, OBJ_BLOB,
+ oid);
+ else
+ hash_object_file(istate->repo->hash_algo, sbuf.buf, sbuf.len, OBJ_BLOB,
+ oid);
+ strbuf_release(&sbuf);
+ return ret;
+}
+
+static int index_pipe(struct index_state *istate, struct object_id *oid,
+ int fd, enum object_type type,
+ const char *path, unsigned flags)
+{
+ struct strbuf sbuf = STRBUF_INIT;
+ int ret;
+
+ if (strbuf_read(&sbuf, fd, 4096) >= 0)
+ ret = index_mem(istate, oid, sbuf.buf, sbuf.len, type, path, flags);
+ else
+ ret = -1;
+ strbuf_release(&sbuf);
+ return ret;
+}
+
+#define SMALL_FILE_SIZE (32*1024)
+
+static int index_core(struct index_state *istate,
+ struct object_id *oid, int fd, size_t size,
+ enum object_type type, const char *path,
+ unsigned flags)
+{
+ int ret;
+
+ if (!size) {
+ ret = index_mem(istate, oid, "", size, type, path, flags);
+ } else if (size <= SMALL_FILE_SIZE) {
+ char *buf = xmalloc(size);
+ ssize_t read_result = read_in_full(fd, buf, size);
+ if (read_result < 0)
+ ret = error_errno(_("read error while indexing %s"),
+ path ? path : "<unknown>");
+ else if ((size_t) read_result != size)
+ ret = error(_("short read while indexing %s"),
+ path ? path : "<unknown>");
+ else
+ ret = index_mem(istate, oid, buf, size, type, path, flags);
+ free(buf);
+ } else {
+ void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
+ ret = index_mem(istate, oid, buf, size, type, path, flags);
+ munmap(buf, size);
+ }
+ return ret;
+}
+
+int index_fd(struct index_state *istate, struct object_id *oid,
+ int fd, struct stat *st,
+ enum object_type type, const char *path, unsigned flags)
+{
+ int ret;
+
+ /*
+ * Call xsize_t() only when needed to avoid potentially unnecessary
+ * die() for large files.
+ */
+ if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path))
+ ret = index_stream_convert_blob(istate, oid, fd, path, flags);
+ else if (!S_ISREG(st->st_mode))
+ ret = index_pipe(istate, oid, fd, type, path, flags);
+ else if ((st->st_size >= 0 && (size_t) st->st_size <= repo_settings_get_big_file_threshold(istate->repo)) ||
+ type != OBJ_BLOB ||
+ (path && would_convert_to_git(istate, path)))
+ ret = index_core(istate, oid, fd, xsize_t(st->st_size),
+ type, path, flags);
+ else
+ ret = index_blob_bulk_checkin(oid, fd, xsize_t(st->st_size), path,
+ flags);
+ close(fd);
+ return ret;
+}
+
+int index_path(struct index_state *istate, struct object_id *oid,
+ const char *path, struct stat *st, unsigned flags)
+{
+ int fd;
+ struct strbuf sb = STRBUF_INIT;
+ int rc = 0;
+
+ switch (st->st_mode & S_IFMT) {
+ case S_IFREG:
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return error_errno("open(\"%s\")", path);
+ if (index_fd(istate, oid, fd, st, OBJ_BLOB, path, flags) < 0)
+ return error(_("%s: failed to insert into database"),
+ path);
+ break;
+ case S_IFLNK:
+ if (strbuf_readlink(&sb, path, st->st_size))
+ return error_errno("readlink(\"%s\")", path);
+ if (!(flags & INDEX_WRITE_OBJECT))
+ hash_object_file(istate->repo->hash_algo, sb.buf, sb.len,
+ OBJ_BLOB, oid);
+ else if (odb_write_object(istate->repo->objects, sb.buf, sb.len, OBJ_BLOB, oid))
+ rc = error(_("%s: failed to insert into database"), path);
+ strbuf_release(&sb);
+ break;
+ case S_IFDIR:
+ return repo_resolve_gitlink_ref(istate->repo, path, "HEAD", oid);
+ default:
+ return error(_("%s: unsupported file type"), path);
+ }
+ return rc;
+}
+
+int read_pack_header(int fd, struct pack_header *header)
+{
+ if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header))
+ /* "eof before pack header was fully read" */
+ return PH_ERROR_EOF;
+
+ if (header->hdr_signature != htonl(PACK_SIGNATURE))
+ /* "protocol error (pack signature mismatch detected)" */
+ return PH_ERROR_PACK_SIGNATURE;
+ if (!pack_version_ok(header->hdr_version))
+ /* "protocol error (pack version unsupported)" */
+ return PH_ERROR_PROTOCOL;
+ return 0;
+}
+
+static int for_each_file_in_obj_subdir(unsigned int subdir_nr,
+ struct strbuf *path,
+ const struct git_hash_algo *algop,
+ each_loose_object_fn obj_cb,
+ each_loose_cruft_fn cruft_cb,
+ each_loose_subdir_fn subdir_cb,
+ void *data)
+{
+ size_t origlen, baselen;
+ DIR *dir;
+ struct dirent *de;
+ int r = 0;
+ struct object_id oid;
+
+ if (subdir_nr > 0xff)
+ BUG("invalid loose object subdirectory: %x", subdir_nr);
+
+ origlen = path->len;
+ strbuf_complete(path, '/');
+ strbuf_addf(path, "%02x", subdir_nr);
+
+ dir = opendir(path->buf);
+ if (!dir) {
+ if (errno != ENOENT)
+ r = error_errno(_("unable to open %s"), path->buf);
+ strbuf_setlen(path, origlen);
+ return r;
+ }
+
+ oid.hash[0] = subdir_nr;
+ strbuf_addch(path, '/');
+ baselen = path->len;
+
+ while ((de = readdir_skip_dot_and_dotdot(dir))) {
+ size_t namelen;
+
+ namelen = strlen(de->d_name);
+ strbuf_setlen(path, baselen);
+ strbuf_add(path, de->d_name, namelen);
+ if (namelen == algop->hexsz - 2 &&
+ !hex_to_bytes(oid.hash + 1, de->d_name,
+ algop->rawsz - 1)) {
+ oid_set_algo(&oid, algop);
+ memset(oid.hash + algop->rawsz, 0,
+ GIT_MAX_RAWSZ - algop->rawsz);
+ if (obj_cb) {
+ r = obj_cb(&oid, path->buf, data);
+ if (r)
+ break;
+ }
+ continue;
+ }
+
+ if (cruft_cb) {
+ r = cruft_cb(de->d_name, path->buf, data);
+ if (r)
+ break;
+ }
+ }
+ closedir(dir);
+
+ strbuf_setlen(path, baselen - 1);
+ if (!r && subdir_cb)
+ r = subdir_cb(subdir_nr, path->buf, data);
+
+ strbuf_setlen(path, origlen);
+
+ return r;
+}
+
+int for_each_loose_file_in_source(struct odb_source *source,
+ each_loose_object_fn obj_cb,
+ each_loose_cruft_fn cruft_cb,
+ each_loose_subdir_fn subdir_cb,
+ void *data)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int r;
+
+ strbuf_addstr(&buf, source->path);
+ for (int i = 0; i < 256; i++) {
+ r = for_each_file_in_obj_subdir(i, &buf, source->odb->repo->hash_algo,
+ obj_cb, cruft_cb, subdir_cb, data);
+ if (r)
+ break;
+ }
+
+ strbuf_release(&buf);
+ return r;
+}
+
+int for_each_loose_object(struct object_database *odb,
+ each_loose_object_fn cb, void *data,
+ enum for_each_object_flags flags)
+{
+ struct odb_source *source;
+
+ odb_prepare_alternates(odb);
+ for (source = odb->sources; source; source = source->next) {
+ int r = for_each_loose_file_in_source(source, cb, NULL,
+ NULL, data);
+ if (r)
+ return r;
+
+ if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
+ break;
+ }
+
+ return 0;
+}
+
+static int append_loose_object(const struct object_id *oid,
+ const char *path UNUSED,
+ void *data)
+{
+ oidtree_insert(data, oid);
+ return 0;
+}
+
+struct oidtree *odb_loose_cache(struct odb_source *source,
+ const struct object_id *oid)
+{
+ int subdir_nr = oid->hash[0];
+ struct strbuf buf = STRBUF_INIT;
+ size_t word_bits = bitsizeof(source->loose_objects_subdir_seen[0]);
+ size_t word_index = subdir_nr / word_bits;
+ size_t mask = (size_t)1u << (subdir_nr % word_bits);
+ uint32_t *bitmap;
+
+ if (subdir_nr < 0 ||
+ (size_t) subdir_nr >= bitsizeof(source->loose_objects_subdir_seen))
+ BUG("subdir_nr out of range");
+
+ bitmap = &source->loose_objects_subdir_seen[word_index];
+ if (*bitmap & mask)
+ return source->loose_objects_cache;
+ if (!source->loose_objects_cache) {
+ ALLOC_ARRAY(source->loose_objects_cache, 1);
+ oidtree_init(source->loose_objects_cache);
+ }
+ strbuf_addstr(&buf, source->path);
+ for_each_file_in_obj_subdir(subdir_nr, &buf,
+ source->odb->repo->hash_algo,
+ append_loose_object,
+ NULL, NULL,
+ source->loose_objects_cache);
+ *bitmap |= mask;
+ strbuf_release(&buf);
+ return source->loose_objects_cache;
+}
+
+void odb_clear_loose_cache(struct odb_source *source)
+{
+ oidtree_clear(source->loose_objects_cache);
+ FREE_AND_NULL(source->loose_objects_cache);
+ memset(&source->loose_objects_subdir_seen, 0,
+ sizeof(source->loose_objects_subdir_seen));
+}
+
+static int check_stream_oid(git_zstream *stream,
+ const char *hdr,
+ unsigned long size,
+ const char *path,
+ const struct object_id *expected_oid,
+ const struct git_hash_algo *algop)
+{
+ struct git_hash_ctx c;
+ struct object_id real_oid;
+ unsigned char buf[4096];
+ unsigned long total_read;
+ int status = Z_OK;
+
+ algop->init_fn(&c);
+ git_hash_update(&c, hdr, stream->total_out);
+
+ /*
+ * We already read some bytes into hdr, but the ones up to the NUL
+ * do not count against the object's content size.
+ */
+ total_read = stream->total_out - strlen(hdr) - 1;
+
+ /*
+ * This size comparison must be "<=" to read the final zlib packets;
+ * see the comment in unpack_loose_rest for details.
+ */
+ while (total_read <= size &&
+ (status == Z_OK ||
+ (status == Z_BUF_ERROR && !stream->avail_out))) {
+ stream->next_out = buf;
+ stream->avail_out = sizeof(buf);
+ if (size - total_read < stream->avail_out)
+ stream->avail_out = size - total_read;
+ status = git_inflate(stream, Z_FINISH);
+ git_hash_update(&c, buf, stream->next_out - buf);
+ total_read += stream->next_out - buf;
+ }
+
+ if (status != Z_STREAM_END) {
+ error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid));
+ return -1;
+ }
+ if (stream->avail_in) {
+ error(_("garbage at end of loose object '%s'"),
+ oid_to_hex(expected_oid));
+ return -1;
+ }
+
+ git_hash_final_oid(&real_oid, &c);
+ if (!oideq(expected_oid, &real_oid)) {
+ error(_("hash mismatch for %s (expected %s)"), path,
+ oid_to_hex(expected_oid));
+ return -1;
+ }
+
+ return 0;
+}
+
+int read_loose_object(struct repository *repo,
+ const char *path,
+ const struct object_id *expected_oid,
+ struct object_id *real_oid,
+ void **contents,
+ struct object_info *oi)
+{
+ int ret = -1;
+ int fd;
+ void *map = NULL;
+ unsigned long mapsize;
+ git_zstream stream;
+ char hdr[MAX_HEADER_LEN];
+ unsigned long *size = oi->sizep;
+
+ fd = git_open(path);
+ if (fd >= 0)
+ map = map_fd(fd, path, &mapsize);
+ if (!map) {
+ error_errno(_("unable to mmap %s"), path);
+ goto out;
+ }
+
+ if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) != ULHR_OK) {
+ error(_("unable to unpack header of %s"), path);
+ goto out_inflate;
+ }
+
+ if (parse_loose_header(hdr, oi) < 0) {
+ error(_("unable to parse header of %s"), path);
+ goto out_inflate;
+ }
+
+ if (*oi->typep < 0) {
+ error(_("unable to parse type from header '%s' of %s"),
+ hdr, path);
+ goto out_inflate;
+ }
+
+ if (*oi->typep == OBJ_BLOB &&
+ *size > repo_settings_get_big_file_threshold(repo)) {
+ if (check_stream_oid(&stream, hdr, *size, path, expected_oid,
+ repo->hash_algo) < 0)
+ goto out_inflate;
+ } else {
+ *contents = unpack_loose_rest(&stream, hdr, *size, expected_oid);
+ if (!*contents) {
+ error(_("unable to unpack contents of %s"), path);
+ goto out_inflate;
+ }
+ hash_object_file(repo->hash_algo,
+ *contents, *size,
+ *oi->typep, real_oid);
+ if (!oideq(expected_oid, real_oid))
+ goto out_inflate;
+ }
+
+ ret = 0; /* everything checks out */
+
+out_inflate:
+ git_inflate_end(&stream);
+out:
+ if (map)
+ munmap(map, mapsize);
+ return ret;
+}
generated by cgit v1.2.3 (git 2.46.0) at 2025-08-06 14:35:37 +0000