<div dir="ltr"><div>Thanks for the tip, Thomas!<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Feb 15, 2024 at 9:45 AM thomas bonfort <<a href="mailto:thomas.bonfort@gmail.com">thomas.bonfort@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi Sean,</div><div>I believe/recall this is very driver dependent. Some drivers will look for their sidecars in the provided sibling files list returned by VSISiblingFiles, whereas others will unconditionally try to open well-known sidecar names they will have computed from their own name. IIRC I added VSISiblingFiles so that some vsi backends (namely object storage based ones) could explicitly return an empty list of sibling files in order to prevent drivers to emit a subsequent Readdir() (which might break drivers that require sidecar files to work, but speeds up those where sidecar files are optional and not used in a cloud-storage environment (namely cogs) )<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 13, 2024 at 6:12 PM Sean Gillies via gdal-dev <<a href="mailto:gdal-dev@lists.osgeo.org" target="_blank">gdal-dev@lists.osgeo.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi all,<br></div><div><br></div><div>It's not clear to me from reading <a href="https://gdal.org/user/virtual_file_systems.html" target="_blank">https://gdal.org/user/virtual_file_systems.html</a> if VSI sidecar and sibling file lookup works in general, by design, or whether it's an implementation detail of the standard VSI filesystems ("vsizip", "vsicurl", etc.).<br></div><div><br></div><div>More specifically: if I have a "/vsipyopener/foo.tif" object, do drivers always look for other files at paths precisely relative to that one? Does this vary among drivers?</div></div></blockquote></div>
</blockquote></div><br clear="all"><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature">Sean Gillies</div></div>