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copy: add new flags that cause a seek to beginning of files before copying

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This is quite useful in various cases where we so far did this manually.
This commit is contained in:
Lennart Poettering
2026-03-23 19:19:46 +00:00
committed by Luca Boccassi
parent 6fb5ec3dd1
commit 5adfd44c9e
5 changed files with 21 additions and 24 deletions
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src/bootctl/bootctl-install.c
+1 -4
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@@ -554,10 +554,7 @@ static int copy_file_with_version_check(
* might be left at the end of the file. (Resetting before rather than after a copy attempt is safer
* because a previous attempt might have failed half-way, leaving the file offset at some undefined
* place.) */
if (lseek(source_fd, 0, SEEK_SET) < 0)
return log_error_errno(errno, "Failed to seek in \"%s\": %m", source_path);
r = copy_bytes(source_fd, write_fd, UINT64_MAX, COPY_REFLINK);
r = copy_bytes(source_fd, write_fd, UINT64_MAX, COPY_REFLINK|COPY_SEEK0_SOURCE);
if (r < 0)
return log_error_errno(r, "Failed to copy data from \"%s\" to \"%s\": %m", source_path, dest_path);