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Diffstat (limited to 'sha1_file.c')
-rw-r--r--sha1_file.c117
1 files changed, 84 insertions, 33 deletions
diff --git a/sha1_file.c b/sha1_file.c
index 0cd9435619..1cafdfa617 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -35,6 +35,8 @@ static size_t sz_fmt(size_t s) { return s; }
const unsigned char null_sha1[20];
+static int git_open_noatime(const char *name, struct packed_git *p);
+
int safe_create_leading_directories(char *path)
{
char *pos = path + offset_1st_component(path);
@@ -298,7 +300,7 @@ static void read_info_alternates(const char * relative_base, int depth)
int fd;
sprintf(path, "%s/%s", relative_base, alt_file_name);
- fd = open(path, O_RDONLY);
+ fd = git_open_noatime(path, NULL);
if (fd < 0)
return;
if (fstat(fd, &st) || (st.st_size == 0)) {
@@ -411,7 +413,7 @@ static int check_packed_git_idx(const char *path, struct packed_git *p)
struct pack_idx_header *hdr;
size_t idx_size;
uint32_t version, nr, i, *index;
- int fd = open(path, O_RDONLY);
+ int fd = git_open_noatime(path, p);
struct stat st;
if (fd < 0)
@@ -576,6 +578,21 @@ void release_pack_memory(size_t need, int fd)
; /* nothing */
}
+void *xmmap(void *start, size_t length,
+ int prot, int flags, int fd, off_t offset)
+{
+ void *ret = mmap(start, length, prot, flags, fd, offset);
+ if (ret == MAP_FAILED) {
+ if (!length)
+ return NULL;
+ release_pack_memory(length, fd);
+ ret = mmap(start, length, prot, flags, fd, offset);
+ if (ret == MAP_FAILED)
+ die_errno("Out of memory? mmap failed");
+ }
+ return ret;
+}
+
void close_pack_windows(struct packed_git *p)
{
while (p->windows) {
@@ -655,9 +672,7 @@ static int open_packed_git_1(struct packed_git *p)
if (!p->index_data && open_pack_index(p))
return error("packfile %s index unavailable", p->pack_name);
- p->pack_fd = open(p->pack_name, O_RDONLY);
- while (p->pack_fd < 0 && errno == EMFILE && unuse_one_window(p, -1))
- p->pack_fd = open(p->pack_name, O_RDONLY);
+ p->pack_fd = git_open_noatime(p->pack_name, p);
if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
return -1;
@@ -803,11 +818,22 @@ static struct packed_git *alloc_packed_git(int extra)
return p;
}
+static void try_to_free_pack_memory(size_t size)
+{
+ release_pack_memory(size, -1);
+}
+
struct packed_git *add_packed_git(const char *path, int path_len, int local)
{
+ static int have_set_try_to_free_routine;
struct stat st;
struct packed_git *p = alloc_packed_git(path_len + 2);
+ if (!have_set_try_to_free_routine) {
+ have_set_try_to_free_routine = 1;
+ set_try_to_free_routine(try_to_free_pack_memory);
+ }
+
/*
* Make sure a corresponding .pack file exists and that
* the index looks sane.
@@ -874,7 +900,7 @@ static void prepare_packed_git_one(char *objdir, int local)
sprintf(path, "%s/pack", objdir);
len = strlen(path);
dir = opendir(path);
- while (!dir && errno == EMFILE && unuse_one_window(packed_git, -1))
+ while (!dir && errno == EMFILE && unuse_one_window(NULL, -1))
dir = opendir(path);
if (!dir) {
if (errno != ENOENT)
@@ -1003,7 +1029,7 @@ static void mark_bad_packed_object(struct packed_git *p,
p->num_bad_objects++;
}
-static int has_packed_and_bad(const unsigned char *sha1)
+static const struct packed_git *has_packed_and_bad(const unsigned char *sha1)
{
struct packed_git *p;
unsigned i;
@@ -1011,8 +1037,8 @@ static int has_packed_and_bad(const unsigned char *sha1)
for (p = packed_git; p; p = p->next)
for (i = 0; i < p->num_bad_objects; i++)
if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
- return 1;
- return 0;
+ return p;
+ return NULL;
}
int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
@@ -1022,18 +1048,31 @@ int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long siz
return hashcmp(sha1, real_sha1) ? -1 : 0;
}
-static int git_open_noatime(const char *name)
+static int git_open_noatime(const char *name, struct packed_git *p)
{
static int sha1_file_open_flag = O_NOATIME;
- int fd = open(name, O_RDONLY | sha1_file_open_flag);
- /* Might the failure be due to O_NOATIME? */
- if (fd < 0 && errno != ENOENT && sha1_file_open_flag) {
- fd = open(name, O_RDONLY);
+ for (;;) {
+ int fd = open(name, O_RDONLY | sha1_file_open_flag);
if (fd >= 0)
+ return fd;
+
+ /* Might the failure be insufficient file descriptors? */
+ if (errno == EMFILE) {
+ if (unuse_one_window(p, -1))
+ continue;
+ else
+ return -1;
+ }
+
+ /* Might the failure be due to O_NOATIME? */
+ if (errno != ENOENT && sha1_file_open_flag) {
sha1_file_open_flag = 0;
+ continue;
+ }
+
+ return -1;
}
- return fd;
}
static int open_sha1_file(const unsigned char *sha1)
@@ -1042,7 +1081,7 @@ static int open_sha1_file(const unsigned char *sha1)
char *name = sha1_file_name(sha1);
struct alternate_object_database *alt;
- fd = git_open_noatime(name);
+ fd = git_open_noatime(name, NULL);
if (fd >= 0)
return fd;
@@ -1051,7 +1090,7 @@ static int open_sha1_file(const unsigned char *sha1)
for (alt = alt_odb_list; alt; alt = alt->next) {
name = alt->name;
fill_sha1_path(name, sha1);
- fd = git_open_noatime(alt->base);
+ fd = git_open_noatime(alt->base, NULL);
if (fd >= 0)
return fd;
}
@@ -2079,36 +2118,48 @@ static void *read_object(const unsigned char *sha1, enum object_type *type,
return read_packed_sha1(sha1, type, size);
}
+/*
+ * This function dies on corrupt objects; the callers who want to
+ * deal with them should arrange to call read_object() and give error
+ * messages themselves.
+ */
void *read_sha1_file_repl(const unsigned char *sha1,
enum object_type *type,
unsigned long *size,
const unsigned char **replacement)
{
const unsigned char *repl = lookup_replace_object(sha1);
- void *data = read_object(repl, type, size);
+ void *data;
char *path;
+ const struct packed_git *p;
+
+ errno = 0;
+ data = read_object(repl, type, size);
+ if (data) {
+ if (replacement)
+ *replacement = repl;
+ return data;
+ }
+
+ if (errno != ENOENT)
+ die_errno("failed to read object %s", sha1_to_hex(sha1));
/* die if we replaced an object with one that does not exist */
- if (!data && repl != sha1)
+ if (repl != sha1)
die("replacement %s not found for %s",
sha1_to_hex(repl), sha1_to_hex(sha1));
- /* legacy behavior is to die on corrupted objects */
- if (!data) {
- if (has_loose_object(repl)) {
- path = sha1_file_name(sha1);
- die("loose object %s (stored in %s) is corrupted", sha1_to_hex(repl), path);
- }
- if (has_packed_and_bad(repl)) {
- path = sha1_pack_name(sha1);
- die("packed object %s (stored in %s) is corrupted", sha1_to_hex(repl), path);
- }
+ if (has_loose_object(repl)) {
+ path = sha1_file_name(sha1);
+ die("loose object %s (stored in %s) is corrupt",
+ sha1_to_hex(repl), path);
}
- if (replacement)
- *replacement = repl;
+ if ((p = has_packed_and_bad(repl)) != NULL)
+ die("packed object %s (stored in %s) is corrupt",
+ sha1_to_hex(repl), p->pack_name);
- return data;
+ return NULL;
}
void *read_object_with_reference(const unsigned char *sha1,
@@ -2300,7 +2351,7 @@ static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
filename = sha1_file_name(sha1);
fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename);
- while (fd < 0 && errno == EMFILE && unuse_one_window(packed_git, -1))
+ while (fd < 0 && errno == EMFILE && unuse_one_window(NULL, -1))
fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename);
if (fd < 0) {
if (errno == EACCES)