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When the BR2_DL_DIR is a mountpoint (presumably shared between various machine, or mounted from the local host when running in a VM), it is possible that it does not support hardlinks (e.g. samba, or the VMWare VMFS, etc...). If the hardlink fails, fallback to copying the file. As a last resort, if that also fails, eventually fallback to doing the download. Note: this means that the dl-wrapper is no longer atomic-safe: the code suffers of a TOCTTOU condition: the file may be created in-between the check and the moment we try to ln/cp it. Fortunately, the dl-wrapper is now run under an flock, so we're still safe. If we eventually go for a more fine-grained implementation, we'll have to be careful then. Reported-by: Arnout Vandecappelle <arnout@mind.be> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Arnout Vandecappelle <arnout@mind.be> Cc: Peter Korsgaard <peter@korsgaard.com> Cc: Maxime Hadjinlian <maxime.hadjinlian@gmail.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches