Adrian Reber
ad151a463d
repart populates vfat file systems through mtools, as we have no vfat library, and the wrappers for that lived as static functions in mkfs-util.c, next to the mkfs invocation. systemd-firstboot is about to need the same thing for placing a file in the ESP of an image without mounting it. Move the code into vfat-util.c with a small public API: copying a whole tree (what repart did so far), creating a directory with its parents, and copying a single file. The functions take the image path and the byte offset of the file system in it, so that a partition inside a larger image can be addressed. That mtools is doing the work underneath, and that the offset is passed to it with its "@@" syntax, stays an implementation detail that could be replaced. The helper that formats $SOURCE_DATE_EPOCH for child processes is needed by both callers now, hence move it next to parse_source_date_epoch(). Add a test that writes into a vfat image at an offset and reads the result back with mtype.
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