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-rw-r--r--copy.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/copy.c b/copy.c
index 23d84c6..3df156f 100644
--- a/copy.c
+++ b/copy.c
@@ -1,6 +1,9 @@
#include "git-compat-util.h"
#include "copy.h"
#include "path.h"
+#include "gettext.h"
+#include "strbuf.h"
+#include "abspath.h"
int copy_fd(int ifd, int ofd)
{
@@ -67,3 +70,61 @@ int copy_file_with_time(const char *dst, const char *src, int mode)
return copy_times(dst, src);
return status;
}
+
+static int do_symlinks_match(const char *path1, const char *path2)
+{
+ struct strbuf buf1 = STRBUF_INIT, buf2 = STRBUF_INIT;
+ int ret = 0;
+
+ if (!strbuf_readlink(&buf1, path1, 0) &&
+ !strbuf_readlink(&buf2, path2, 0))
+ ret = !strcmp(buf1.buf, buf2.buf);
+
+ strbuf_release(&buf1);
+ strbuf_release(&buf2);
+ return ret;
+}
+
+int do_files_match(const char *path1, const char *path2)
+{
+ struct stat st1, st2;
+ int fd1 = -1, fd2 = -1, ret = 1;
+ char buf1[8192], buf2[8192];
+
+ if ((fd1 = open_nofollow(path1, O_RDONLY)) < 0 ||
+ fstat(fd1, &st1) || !S_ISREG(st1.st_mode)) {
+ if (fd1 < 0 && errno == ELOOP)
+ /* maybe this is a symbolic link? */
+ return do_symlinks_match(path1, path2);
+ ret = 0;
+ } else if ((fd2 = open_nofollow(path2, O_RDONLY)) < 0 ||
+ fstat(fd2, &st2) || !S_ISREG(st2.st_mode)) {
+ ret = 0;
+ }
+
+ if (ret)
+ /* to match, neither must be executable, or both */
+ ret = !(st1.st_mode & 0111) == !(st2.st_mode & 0111);
+
+ if (ret)
+ ret = st1.st_size == st2.st_size;
+
+ while (ret) {
+ ssize_t len1 = read_in_full(fd1, buf1, sizeof(buf1));
+ ssize_t len2 = read_in_full(fd2, buf2, sizeof(buf2));
+
+ if (len1 < 0 || len2 < 0 || len1 != len2)
+ ret = 0; /* read error or different file size */
+ else if (!len1) /* len2 is also 0; hit EOF on both */
+ break; /* ret is still true */
+ else
+ ret = !memcmp(buf1, buf2, len1);
+ }
+
+ if (fd1 >= 0)
+ close(fd1);
+ if (fd2 >= 0)
+ close(fd2);
+
+ return ret;
+}