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From: | seeteena |
Subject: | Re: [Qemu-devel] [PATCH v1] hmp: 'info snapshots' not showing the id |
Date: | Tue, 2 Jan 2018 12:12:49 +0530 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 |
On 12/22/2017 01:07 PM, Markus Armbruster wrote:
char *id_generate(IdSubSystems id) autogenates ID in the format eg- "#block146" with starting with '#' always. restricting ID strings to use id_wellformed() means we need to force ID to start with letter.Eric Blake <address@hidden> writes:On 12/19/2017 08:20 AM, Max Reitz wrote:So there are three things: (1) We probably should not allow snapshot names that could be IDs. Easiest way to solve this: Names have to start with a non-digit.Yes, that would be a nice change. It is not strictly backwards compatible (so we'd still have to cope with images that didn't follow the rule, whether created by older qemu or by non-qemu implementations of qcow2), but would alleviate a lot of confusion.I recommend to restrict ID strings to letters, digits, '-', '.', '_', starting with a letter. Use id_wellformed() to check.
#define ID_SPECIAL_CHAR '#' needs to change to (some letter) #define ID_SPECIAL_CHAR 'A'
If backward compatibility is an issue, deprecate offending IDs (with a suitable warning), and kill them off after the customary grace period. IDs embedded in image files and such you may have to keep working somehow indefinitely.
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