bedd3b4b7b
Teach a few codepaths to punt (instead of dying) when large blobs that would not fit in core are involved in the operation. * nd/large-blobs: diff: shortcut for diff'ing two binary SHA-1 objects diff --stat: mark any file larger than core.bigfilethreshold binary diff.c: allow to pass more flags to diff_populate_filespec sha1_file.c: do not die failing to malloc in unpack_compressed_entry wrapper.c: introduce gentle xmallocz that does not die()
540 lines
11 KiB
C
540 lines
11 KiB
C
/*
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* Various trivial helper wrappers around standard functions
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*/
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#include "cache.h"
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static void do_nothing(size_t size)
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{
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}
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static void (*try_to_free_routine)(size_t size) = do_nothing;
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static int memory_limit_check(size_t size, int gentle)
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{
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static int limit = -1;
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if (limit == -1) {
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const char *env = getenv("GIT_ALLOC_LIMIT");
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limit = env ? atoi(env) * 1024 : 0;
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}
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if (limit && size > limit) {
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if (gentle) {
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error("attempting to allocate %"PRIuMAX" over limit %d",
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(intmax_t)size, limit);
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return -1;
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} else
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die("attempting to allocate %"PRIuMAX" over limit %d",
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(intmax_t)size, limit);
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}
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return 0;
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}
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try_to_free_t set_try_to_free_routine(try_to_free_t routine)
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{
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try_to_free_t old = try_to_free_routine;
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if (!routine)
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routine = do_nothing;
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try_to_free_routine = routine;
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return old;
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}
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char *xstrdup(const char *str)
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{
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char *ret = strdup(str);
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if (!ret) {
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try_to_free_routine(strlen(str) + 1);
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ret = strdup(str);
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if (!ret)
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die("Out of memory, strdup failed");
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}
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return ret;
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}
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static void *do_xmalloc(size_t size, int gentle)
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{
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void *ret;
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if (memory_limit_check(size, gentle))
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return NULL;
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ret = malloc(size);
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if (!ret && !size)
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ret = malloc(1);
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if (!ret) {
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try_to_free_routine(size);
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ret = malloc(size);
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if (!ret && !size)
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ret = malloc(1);
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if (!ret) {
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if (!gentle)
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die("Out of memory, malloc failed (tried to allocate %lu bytes)",
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(unsigned long)size);
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else {
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error("Out of memory, malloc failed (tried to allocate %lu bytes)",
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(unsigned long)size);
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return NULL;
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}
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}
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}
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#ifdef XMALLOC_POISON
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memset(ret, 0xA5, size);
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#endif
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return ret;
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}
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void *xmalloc(size_t size)
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{
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return do_xmalloc(size, 0);
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}
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static void *do_xmallocz(size_t size, int gentle)
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{
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void *ret;
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if (unsigned_add_overflows(size, 1)) {
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if (gentle) {
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error("Data too large to fit into virtual memory space.");
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return NULL;
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} else
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die("Data too large to fit into virtual memory space.");
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}
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ret = do_xmalloc(size + 1, gentle);
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if (ret)
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((char*)ret)[size] = 0;
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return ret;
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}
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void *xmallocz(size_t size)
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{
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return do_xmallocz(size, 0);
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}
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void *xmallocz_gently(size_t size)
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{
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return do_xmallocz(size, 1);
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}
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/*
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* xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
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* "data" to the allocated memory, zero terminates the allocated memory,
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* and returns a pointer to the allocated memory. If the allocation fails,
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* the program dies.
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*/
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void *xmemdupz(const void *data, size_t len)
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{
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return memcpy(xmallocz(len), data, len);
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}
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char *xstrndup(const char *str, size_t len)
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{
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char *p = memchr(str, '\0', len);
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return xmemdupz(str, p ? p - str : len);
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}
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void *xrealloc(void *ptr, size_t size)
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{
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void *ret;
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memory_limit_check(size, 0);
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ret = realloc(ptr, size);
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if (!ret && !size)
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ret = realloc(ptr, 1);
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if (!ret) {
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try_to_free_routine(size);
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ret = realloc(ptr, size);
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if (!ret && !size)
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ret = realloc(ptr, 1);
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if (!ret)
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die("Out of memory, realloc failed");
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}
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return ret;
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}
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void *xcalloc(size_t nmemb, size_t size)
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{
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void *ret;
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memory_limit_check(size * nmemb, 0);
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ret = calloc(nmemb, size);
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if (!ret && (!nmemb || !size))
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ret = calloc(1, 1);
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if (!ret) {
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try_to_free_routine(nmemb * size);
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ret = calloc(nmemb, size);
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if (!ret && (!nmemb || !size))
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ret = calloc(1, 1);
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if (!ret)
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die("Out of memory, calloc failed");
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}
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return ret;
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}
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/*
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* Limit size of IO chunks, because huge chunks only cause pain. OS X
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* 64-bit is buggy, returning EINVAL if len >= INT_MAX; and even in
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* the absence of bugs, large chunks can result in bad latencies when
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* you decide to kill the process.
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*/
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#define MAX_IO_SIZE (8*1024*1024)
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/*
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* xread() is the same a read(), but it automatically restarts read()
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* operations with a recoverable error (EAGAIN and EINTR). xread()
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* DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
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*/
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ssize_t xread(int fd, void *buf, size_t len)
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{
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ssize_t nr;
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if (len > MAX_IO_SIZE)
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len = MAX_IO_SIZE;
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while (1) {
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nr = read(fd, buf, len);
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if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
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continue;
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return nr;
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}
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}
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/*
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* xwrite() is the same a write(), but it automatically restarts write()
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* operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
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* GUARANTEE that "len" bytes is written even if the operation is successful.
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*/
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ssize_t xwrite(int fd, const void *buf, size_t len)
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{
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ssize_t nr;
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if (len > MAX_IO_SIZE)
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len = MAX_IO_SIZE;
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while (1) {
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nr = write(fd, buf, len);
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if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
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continue;
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return nr;
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}
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}
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/*
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* xpread() is the same as pread(), but it automatically restarts pread()
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* operations with a recoverable error (EAGAIN and EINTR). xpread() DOES
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* NOT GUARANTEE that "len" bytes is read even if the data is available.
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*/
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ssize_t xpread(int fd, void *buf, size_t len, off_t offset)
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{
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ssize_t nr;
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if (len > MAX_IO_SIZE)
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len = MAX_IO_SIZE;
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while (1) {
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nr = pread(fd, buf, len, offset);
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if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
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continue;
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return nr;
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}
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}
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ssize_t read_in_full(int fd, void *buf, size_t count)
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{
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char *p = buf;
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ssize_t total = 0;
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while (count > 0) {
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ssize_t loaded = xread(fd, p, count);
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if (loaded < 0)
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return -1;
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if (loaded == 0)
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return total;
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count -= loaded;
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p += loaded;
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total += loaded;
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}
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return total;
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}
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ssize_t write_in_full(int fd, const void *buf, size_t count)
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{
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const char *p = buf;
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ssize_t total = 0;
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while (count > 0) {
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ssize_t written = xwrite(fd, p, count);
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if (written < 0)
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return -1;
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if (!written) {
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errno = ENOSPC;
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return -1;
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}
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count -= written;
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p += written;
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total += written;
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}
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return total;
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}
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ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset)
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{
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char *p = buf;
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ssize_t total = 0;
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while (count > 0) {
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ssize_t loaded = xpread(fd, p, count, offset);
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if (loaded < 0)
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return -1;
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if (loaded == 0)
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return total;
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count -= loaded;
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p += loaded;
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total += loaded;
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offset += loaded;
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}
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return total;
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}
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int xdup(int fd)
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{
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int ret = dup(fd);
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if (ret < 0)
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die_errno("dup failed");
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return ret;
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}
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FILE *xfdopen(int fd, const char *mode)
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{
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FILE *stream = fdopen(fd, mode);
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if (stream == NULL)
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die_errno("Out of memory? fdopen failed");
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return stream;
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}
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int xmkstemp(char *template)
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{
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int fd;
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char origtemplate[PATH_MAX];
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strlcpy(origtemplate, template, sizeof(origtemplate));
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fd = mkstemp(template);
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if (fd < 0) {
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int saved_errno = errno;
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const char *nonrelative_template;
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if (strlen(template) != strlen(origtemplate))
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template = origtemplate;
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nonrelative_template = absolute_path(template);
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errno = saved_errno;
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die_errno("Unable to create temporary file '%s'",
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nonrelative_template);
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}
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return fd;
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}
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/* git_mkstemp() - create tmp file honoring TMPDIR variable */
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int git_mkstemp(char *path, size_t len, const char *template)
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{
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const char *tmp;
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size_t n;
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tmp = getenv("TMPDIR");
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if (!tmp)
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tmp = "/tmp";
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n = snprintf(path, len, "%s/%s", tmp, template);
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if (len <= n) {
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errno = ENAMETOOLONG;
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return -1;
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}
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return mkstemp(path);
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}
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/* git_mkstemps() - create tmp file with suffix honoring TMPDIR variable. */
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int git_mkstemps(char *path, size_t len, const char *template, int suffix_len)
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{
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const char *tmp;
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size_t n;
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tmp = getenv("TMPDIR");
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if (!tmp)
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tmp = "/tmp";
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n = snprintf(path, len, "%s/%s", tmp, template);
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if (len <= n) {
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errno = ENAMETOOLONG;
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return -1;
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}
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return mkstemps(path, suffix_len);
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}
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/* Adapted from libiberty's mkstemp.c. */
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#undef TMP_MAX
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#define TMP_MAX 16384
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int git_mkstemps_mode(char *pattern, int suffix_len, int mode)
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{
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static const char letters[] =
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"abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"0123456789";
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static const int num_letters = 62;
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uint64_t value;
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struct timeval tv;
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char *template;
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size_t len;
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int fd, count;
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len = strlen(pattern);
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if (len < 6 + suffix_len) {
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errno = EINVAL;
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return -1;
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}
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if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) {
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errno = EINVAL;
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return -1;
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}
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/*
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* Replace pattern's XXXXXX characters with randomness.
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* Try TMP_MAX different filenames.
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*/
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gettimeofday(&tv, NULL);
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value = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid();
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template = &pattern[len - 6 - suffix_len];
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for (count = 0; count < TMP_MAX; ++count) {
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uint64_t v = value;
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/* Fill in the random bits. */
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template[0] = letters[v % num_letters]; v /= num_letters;
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template[1] = letters[v % num_letters]; v /= num_letters;
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template[2] = letters[v % num_letters]; v /= num_letters;
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template[3] = letters[v % num_letters]; v /= num_letters;
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template[4] = letters[v % num_letters]; v /= num_letters;
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template[5] = letters[v % num_letters]; v /= num_letters;
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fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode);
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if (fd >= 0)
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return fd;
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/*
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* Fatal error (EPERM, ENOSPC etc).
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* It doesn't make sense to loop.
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*/
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if (errno != EEXIST)
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break;
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/*
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* This is a random value. It is only necessary that
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* the next TMP_MAX values generated by adding 7777 to
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* VALUE are different with (module 2^32).
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*/
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value += 7777;
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}
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/* We return the null string if we can't find a unique file name. */
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pattern[0] = '\0';
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return -1;
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}
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int git_mkstemp_mode(char *pattern, int mode)
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{
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/* mkstemp is just mkstemps with no suffix */
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return git_mkstemps_mode(pattern, 0, mode);
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}
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#ifdef NO_MKSTEMPS
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int gitmkstemps(char *pattern, int suffix_len)
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{
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return git_mkstemps_mode(pattern, suffix_len, 0600);
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}
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#endif
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int xmkstemp_mode(char *template, int mode)
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{
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int fd;
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char origtemplate[PATH_MAX];
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strlcpy(origtemplate, template, sizeof(origtemplate));
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fd = git_mkstemp_mode(template, mode);
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if (fd < 0) {
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int saved_errno = errno;
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const char *nonrelative_template;
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if (!template[0])
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template = origtemplate;
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nonrelative_template = absolute_path(template);
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errno = saved_errno;
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die_errno("Unable to create temporary file '%s'",
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nonrelative_template);
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}
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return fd;
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}
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static int warn_if_unremovable(const char *op, const char *file, int rc)
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{
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if (rc < 0) {
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int err = errno;
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if (ENOENT != err) {
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warning("unable to %s %s: %s",
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op, file, strerror(errno));
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errno = err;
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}
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}
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return rc;
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}
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int unlink_or_warn(const char *file)
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{
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return warn_if_unremovable("unlink", file, unlink(file));
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}
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int rmdir_or_warn(const char *file)
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{
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return warn_if_unremovable("rmdir", file, rmdir(file));
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}
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int remove_or_warn(unsigned int mode, const char *file)
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{
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return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file);
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}
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void warn_on_inaccessible(const char *path)
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{
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warning(_("unable to access '%s': %s"), path, strerror(errno));
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}
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static int access_error_is_ok(int err, unsigned flag)
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{
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return err == ENOENT || err == ENOTDIR ||
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((flag & ACCESS_EACCES_OK) && err == EACCES);
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}
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int access_or_warn(const char *path, int mode, unsigned flag)
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{
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int ret = access(path, mode);
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if (ret && !access_error_is_ok(errno, flag))
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warn_on_inaccessible(path);
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return ret;
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}
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int access_or_die(const char *path, int mode, unsigned flag)
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{
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int ret = access(path, mode);
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if (ret && !access_error_is_ok(errno, flag))
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die_errno(_("unable to access '%s'"), path);
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return ret;
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}
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struct passwd *xgetpwuid_self(void)
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{
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struct passwd *pw;
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errno = 0;
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pw = getpwuid(getuid());
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if (!pw)
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die(_("unable to look up current user in the passwd file: %s"),
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errno ? strerror(errno) : _("no such user"));
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return pw;
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}
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char *xgetcwd(void)
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{
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struct strbuf sb = STRBUF_INIT;
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if (strbuf_getcwd(&sb))
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die_errno(_("unable to get current working directory"));
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return strbuf_detach(&sb, NULL);
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}
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