Comments (6)
digint
commented on August 17, 2024
Thanks for the bug report!
At some point, btrfs subvolume show returns an error, which is not correctly parsed by btrbk (causing the above error).
If you run btrbk with -l debug, you will be able to see what command fails exactly. Could you please paste the debug output here? I'll dig into this later.
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bk1285
commented on August 17, 2024
Hi, here the output
btrbk command line client, version 0.19.1 (Sat Jun 6 16:21:30 2015)
Using configuration: /foo/bar/btrbk.conf
### btrfs subvolume show '/home' 2>&1
Command execution successful
Parsed 11 subvolume detail items: /home
### btrfs subvolume list -a -c -u -q -R '/home'
Command execution successful
Parsed 39 total subvolumes for filesystem at: /home
Found 4 subvolume children of: /home
### btrfs subvolume show '/mnt/btrfs_bkp' 2>&1
Command execution successful
Real path for subvolume "/mnt/btrfs_bkp" is: ERROR
ERROR: process died unexpectedly (btrbk v0.19.1)
Please contact the author: Axel Burri <[email protected]>
Stack Trace:
----------------------------------------
Use of uninitialized value $key in concatenation (.) or string at /usr/sbin/btrbk line 367, <FILE> line 95.
at /usr/sbin/btrbk line 119, <FILE> line 95.
main::__ANON__("Use of uninitialized value \$key in concatenation (.) or strin"...) called at /usr/sbin/btrbk line 367
main::check_file("ERROR", HASH(0x19e4350)) called at /usr/sbin/btrbk line 632
main::btrfs_subvolume_detail(HASH(0x1941280)) called at /usr/sbin/btrbk line 291
main::vinfo_root(HASH(0x1941280)) called at /usr/sbin/btrbk line 1728
/mnt/btrfs_bkp is an empty directory (= mountpoint for my usb-drive, whenever it is attached. Currently it isn't...)
Since the top-level directory ('/') is a btrfs-volume as well, /mnt/btrfs_bkp is a subdirectory within a btrfs-device. Might this be an issue?
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digint
commented on August 17, 2024
I traced the error down to btrfs-progs < 3.17.3, which returns exit status 0 on errors:
commit 05afee34683f5a57fba0b2f55375bef592bb3987
btrfs-progs: fix return value problem for btrfs sub show
This totally confuses btrbk ("Command execution successful") and leads to your error.
Fixed in: 16cfb60
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digint
commented on August 17, 2024
@bk1285 please confirm that you are using btrfs-progs < 3.17.3 and btrbk-0.19.2-dev (on master branch) fixes the problem.
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bk1285
commented on August 17, 2024
Great! Works now for me with btrbk-0.19.2-dev and btrfs-progs version 3.17!
Regards,
Bernd
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digint
commented on August 17, 2024
fix included in btrbk-0.19.2
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