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| -rw-r--r-- | docs/getting-started/troubleshooting.md | 77 |
1 files changed, 49 insertions, 28 deletions
diff --git a/docs/getting-started/troubleshooting.md b/docs/getting-started/troubleshooting.md index 4e2b495..ea3aba1 100644 --- a/docs/getting-started/troubleshooting.md +++ b/docs/getting-started/troubleshooting.md @@ -8,34 +8,55 @@ into their respective build topics in the section describing how to build an AGL image. -## Extended attributes MUST be copied - -**IMPORTANT, The extended attribute set during image construction MUST be copied to the SD card.** - -When using tar to create the SDcard, it is a common error to not copy the extended attributes. Find below instruction for using tar. - -Verify that **tar** version is 1.28 or newer: - -```bash -tar --version -tar (GNU tar) 1.28 -[snip] -``` - -If it is not the case, a native up-to-date version of tar is also generated while building AGL distribution: - -```bash -tmp/sysroots/x86_64-linux/usr/bin/tar-native/tar --version -tar (GNU tar) 1.28 -[snip] -``` - -To copy Automotive Grade Linux (AGL) files AND EXTENDED ATRIBUTES onto the SDcard using tar the command is: - -```bash -tar --extract --xz --numeric-owner --preserve-permissions --preserve-order --totals \ - --xattrs-include='*' --directory=DESTINATION_DIRECTORY --file=agl-demo-platform.....tar.xz -``` +## Including Extended Attributes + +The +[Extended Attributes Set (`xattrs`)](https://linux-audit.com/using-xattrs-extended-attributes-on-linux/) +associated with the image during its construction must be copied to +the bootable media. +The `xattrs` supports +[Smack](https://en.wikipedia.org/wiki/Smack_(software)), which is a +Simplified Mandatory Access Control kernel. + +**NOTE:** See + [https://www.kernel.org/doc/Documentation/security/Smack.txt](https://www.kernel.org/doc/Documentation/security/Smack.txt). + for detailed information on Smack. + +Many methods exist that allow you to create bootable media (e.g. `dd`, `bmaptools`, +`tar`, and AGL-provided scripts such as `mkabl-agl.sh` and `mkefi-agl.sh`). +It is recommended that you do not use `tar` to create bootable media. +However, if you do, you must take these steps to copy `xattrs` to the media: + +1. Verify your `tar` version is 1.28 or newer: + + ```bash + $ tar --version + tar (GNU tar) 1.28 + [snip] + ``` + +2. Optionally update `tar` if required. + Most systems come with `tar` installed. + If you need to install it, see the + "[Installing tar](https://www.howtoforge.com/tutorial/linux-tar-command/#installing-tar)" + section for instructions. + + When you build an AGL distribution, a native up-to-date version of + `tar` is created. + Use the following command to see that version: + + ```bash + $ tmp/sysroots/x86_64-linux/usr/bin/tar-native/tar --version + tar (GNU tar) 1.28 + [snip] + ``` + +3. Copy the AGL files and Extended Attributes Set to your bootable media: + + ```bash + $ tar --extract --xz --numeric-owner --preserve-permissions --preserve-order --totals \ + --xattrs-include='*' --directory=DESTINATION_DIRECTORY --file=agl-demo-platform.....tar.xz + ``` <!-- ## meta-rust |