The usual gb-task-* tags don't appear in /srpms/?/*.git after the task is committed with an srpm which has been already built for another branch.

The tag corresponding to the EVR also doesn't appear in the target branch of the task. Well, technically, that's just because such a tag is already present on another branch, where the same srpm has already been built, but that commit is not re-used, a new one with probably the same tree (the same result from gear-srpmimport) is created in the target branch of the task.

Creating a new commit may seem redundant.

Not creating the gb-task-* tag is very unexpected.

Example:

http://git.altlinux.org/tasks/archive/done/_270/277457/logs/events.2.1.log

libgtk+3-3.24.29-alt1.src.rpm from sisyphus was built into c9f2, but there is a separate commit in this branch, and no tags:

]$ git -C /srpms/l/libgtk+3.git/ log --all --oneline --graph --decorate | head -30
* 82f0c4bd (HEAD -> sisyphus, tag: gb-sisyphus-task277720.100, tag: 3.24.30-alt1, p10) 3.24.30-alt1
* f6b2998b (tag: gb-sisyphus-task270517.100, tag: 3.24.29-alt1) 3.24.29-alt1
* 7f713b11 (tag: gb-sisyphus-task268501.600, tag: 3.24.28-alt1) 3.24.28-alt1
* b578de68 (tag: gb-sisyphus-task267704.600, tag: 3.24.27-alt1) 3.24.27-alt1
* 306b2f38 (tag: gb-sisyphus-task266853.200, tag: 3.24.26-alt1) 3.24.26-alt1
* 6d2966e0 (tag: gb-sisyphus-task266253.100, tag: 3.24.25-alt1) 3.24.25-alt1
* e993b52f (tag: gb-sisyphus-task262986.100, tag: 3.24.24-alt1) 3.24.24-alt1
* 7df577ce (tag: gb-sisyphus-task258314.2000, tag: 3.24.23-alt2) 3.24.23-alt2
* d4acf51f (tag: gb-sisyphus-task257438.100, tag: 3.24.23-alt1) 3.24.23-alt1
* 69e38817 (tag: gb-sisyphus-task256493.300, tag: 3.24.22-alt1) 3.24.22-alt1
* 9ae01dc8 (tag: gb-sisyphus-task254255.100, tag: 3.24.21-alt1) 3.24.21-alt1
* 84c2da46 (tag: gb-sisyphus-task250751.100, tag: 3.24.20-alt1) 3.24.20-alt1
* 612aa707 (tag: gb-sisyphus-task249713.100, tag: 3.24.18-alt1) 3.24.18-alt1
* 57f80e9a (tag: gb-sisyphus-task249330.100, tag: 3.24.17-alt1) 3.24.17-alt1
* 6133031a (tag: gb-sisyphus-task249104.300, tag: gb-sisyphus-task248832.100, tag: 3.24.16-alt1) 3.24.16-alt1
* 6db407a5 (tag: gb-sisyphus-task247780.700, tag: 3.24.14-alt1) 3.24.14-alt1
* 1edfe2fc (tag: gb-sisyphus-task241862.100, tag: 3.24.13-alt1) 3.24.13-alt1
* f008c136 (tag: gb-sisyphus-task238952.400, tag: 3.24.12-alt1) 3.24.12-alt1
| * 66c558fe (c9m2, c9f2, c9f1) 3.24.29-alt1
|/  
* 87ef1bda (tag: gb-sisyphus-task237086.240, tag: gb-p9-task260591.300, tag: gb-p9-task237353.1200, tag: 3.24.11-alt1, old/p9-task270534, c9m1) 3.24.11-alt1
* 6541cb70 (tag: gb-sisyphus-task233719.100, tag: gb-p9-task233929.500, tag: 3.24.10-alt1) 3.24.10-alt1
* 92b5fe48 (tag: gb-sisyphus-task232549.100, tag: gb-p9-task232706.600, tag: 3.24.9-alt1) 3.24.9-alt1
* aafbd4ea (tag: gb-sisyphus-task227101.100, tag: 3.24.8-alt1) 3.24.8-alt1
* 6089b986 (tag: gb-sisyphus-task225059.1000, tag: 3.24.7-alt1) 3.24.7-alt1
* 5b6e9832 (tag: gb-sisyphus-task220558.100, tag: 3.24.5-alt1) 3.24.5-alt1
* a47aea04 (tag: gb-sisyphus-task219722.200, tag: 3.24.4-alt1) 3.24.4-alt1
* 48a2b041 (tag: gb-sisyphus-task219367.100, tag: 3.24.3-alt1) 3.24.3-alt1
* c45aaa8c (tag: gb-sisyphus-task218466.100, tag: 3.24.2-alt2) 3.24.2-alt2
* c642cdd8 (tag: gb-sisyphus-task218134.600, tag: 3.24.2-alt1) 3.24.2-alt1

The trees are actually the same:

$ git -C /srpms/l/libgtk+3.git/ rev-parse 3.24.29-alt1^{tree} c9f2^{tree}
66ae303fc37aa6e25a0758e4f37b0a68ac9356ad
66ae303fc37aa6e25a0758e4f37b0a68ac9356ad

One way to fix this could be to reset in the Git repo the target branch of the task (with an already built srpm) to the already present tag (saving the old branch head as "old-*").