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commit 603ae243f6fe03208a3bb92adecf72403367bd95
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Nov 26 16:59:44 2020 +0100
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support: Add support_copy_file
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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diff --git a/support/Makefile b/support/Makefile
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index 895b83a426369b0c..35b21b19a248ba7f 100644
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--- a/support/Makefile
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+++ b/support/Makefile
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@@ -46,6 +46,7 @@ libsupport-routines = \
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support_capture_subprocess \
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support_capture_subprocess_check \
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support_chroot \
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+ support_copy_file \
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support_copy_file_range \
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support_descriptor_supports_holes \
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support_descriptors \
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diff --git a/support/support.h b/support/support.h
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index 3af87f85fe1b762d..6f7f804847f67600 100644
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--- a/support/support.h
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+++ b/support/support.h
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@@ -115,6 +115,11 @@ extern const char support_install_rootsbindir[];
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/* Corresponds to the install's compiled locale directory. */
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extern const char support_complocaledir_prefix[];
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+/* Copies the file at the path FROM to TO. If TO does not exist, it
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+ is created. If TO is a regular file, it is truncated before
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+ copying. The file mode is copied, but the permissions are not. */
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+extern void support_copy_file (const char *from, const char *to);
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+
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extern ssize_t support_copy_file_range (int, off64_t *, int, off64_t *,
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size_t, unsigned int);
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diff --git a/support/support_copy_file.c b/support/support_copy_file.c
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new file mode 100644
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index 0000000000000000..c93e1e58c81b749d
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--- /dev/null
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+++ b/support/support_copy_file.c
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@@ -0,0 +1,43 @@
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+/* Copy a file from one path to another.
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+ Copyright (C) 2020 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <fcntl.h>
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+#include <support/check.h>
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+#include <support/support.h>
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+#include <support/xunistd.h>
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+
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+void
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+support_copy_file (const char *from, const char *to)
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+{
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+ struct stat64 st;
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+ xstat (from, &st);
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+ int fd_from = xopen (from, O_RDONLY, 0);
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+ mode_t mode = st.st_mode & 0777;
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+ int fd_to = xopen (to, O_WRONLY | O_TRUNC | O_CREAT, mode);
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+ ssize_t ret = support_copy_file_range (fd_from, NULL, fd_to, NULL,
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+ st.st_size, 0);
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+ if (ret < 0)
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+ FAIL_EXIT1 ("copying from \"%s\" to \"%s\": %m", from, to);
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+ if (ret != st.st_size)
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+ FAIL_EXIT1 ("copying from \"%s\" to \"%s\": only %zd of %llu bytes copied",
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+ from, to, ret, (unsigned long long int) st.st_size);
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+ if (fchmod (fd_to, mode) < 0)
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+ FAIL_EXIT1 ("fchmod on %s to 0%o: %m", to, mode);
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+ xclose (fd_to);
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+ xclose (fd_from);
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+}
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