Major changes in 2.0

• Database backend switched from LevelDB to SQLite. There is a migration on
  first launch which can be lengthy for larger setups. The new database is
  easier to understand and maintain and, hopefully, less buggy.

• Deleted items are no longer kept forever in the database, instead they are
  forgotten after six months. If your use case require deletes to take
  effect after more than a six month delay, set the
  --db-delete-retention-interval command line option or corresponding
  environment variable to zero, or a longer time interval of your choosing.

• Modernised command line options parsing. Old single-dash long options are
  no longer supported, e.g. -home must be given as --home. Some options
  have been renamed, others have become subcommands. All serve options are
  now also accepted as environment variables. See syncthing --help and
  syncthing serve --help for details.

• Rolling hash detection of shifted data is no longer supported as this
  effectively never helped. Instead, scanning and syncing is faster and more
  efficient without it.

• A "default folder" is no longer created on first startup.

What's Changed

Fixes

• fix(db): handle large numbers of blocks in update by @calmh in #10025
• fix(syncthing): make directory flags global for all commands by @calmh in #10028
• fix(sqlite): apply options by @pixelspark in #10049
• fix(db): version vector serialisation :( by @calmh in #10050
• fix(model): loop-break regression while block copying in puller by @imsodin in #10069
• fix(model): close fd immediately in copier by @imsodin in #10079
• fix(model): use same folder first in copier by @imsodin in #10093
• fix(config): deep copy configuration defaults (fixes #9916) by @hazemKrimi in #10101
• fix(config): mark audit log options as needing restart (fixes #10099) by @marbens-arch in #10100
• fix(model): correct bufferpool handling; simplify by @calmh in #10113
• fix(versioner): fix perms of created folders (fixes #9626) by @ashishbhate in #10105
• fix(syncthing): ensure both config and data dirs exist at startup (fixes #10126) by @calmh in #10127
• fix(gui): update uncamel() to handle strings like 'IDs' (fixes #10128) by @luckman212 in #10131
• fix(protocol): avoid deadlock with concurrent connection start and close by @calmh in #10140

Features

• feat(gui): close a modal when pressing ESC after switching modal tabs (fixes #9489) by @hazemKrimi in #10092
• feat: add syncthing debug database-statistics command by @calmh in #10117

Other

• chore: remove abandoned next-gen-gui experiment by @calmh in #10004
• chore: remove weak hashing which does not pull its weight by @calmh in #10005
• chore: switch database engine to sqlite (fixes #9954) by @calmh in #9965
• chore: harmonise command line flags by @calmh in #10007
• chore(db): increase journal limit to 64MiB by @bt90 in #10022
• chore: forget deleted files older than six months (fixes #6284) by @calmh in #10023
• chore(db): use shorter read transactions and periodic checkpoint for smaller WAL by @calmh in #10027
• chore: configurable delete retention interval by @calmh in #10030
• chore(db): fix debug logging by @bt90 in #10033
• chore(db): buffer pulled files for smaller WAL by @calmh in #10036
• chore(db): use one SQLite database per folder by @calmh in #10042
• chore(model): delay starting a pull while there are incoming index updates by @calmh in #10041
• chore(syncthing): remove "default" folder concept by @calmh in #10068
• chore(syncthing): ensure migrated database is closed before exiting by @xjtdy888 in #10076
• chore(db, model): simplify per hash DB lookup in copier by @imsodin in #10080
• chore(model): refactor copier for more flatness by @imsodin in #10094
• chore(gui): add Serbian (sr) translation template by @acolomb in #10116
• build: reactivate golangci-lint by @calmh in #10118
• chore: move golangci-lint & meta to separate PR-only workflow by @calmh in #10119
• refactor: use slices.Contains to simplify code by @pullmerge in #10121
• build: process for automatic release tags by @calmh in #10133
• refactor: use slices package for sort by @mrclmr in #10132
• build: upgrade setup-zig action by @calmh in #10134
• refactor: use slices package for sorting by @mrclmr in #10136
• docs: general notes about v2 coming by @calmh in #10135
• build: add labeler workflow for PRs by @calmh in #10143
• build: properly propagate build tags to Debian build by @calmh in #10144

New Contributors

• @hazemKrimi made their first contribution in #10092
• @pullmerge made their first contribution in #10121
• @ashishbhate made their first contribution in #10105
• @mrclmr made their first contribution in #10132

Full Changelog: v1.29.6...v2.0.0-rc.18

Syncthing 2 is coming

Syncthing version 1.x will soon be replaced by Syncthing version 2.x.
Version 2 brings a new database format and various cleanups, but remains
protocol compatible with Syncthing 1.

More detailed information about Syncthing 2 can be found in the release
notes at https://github.com/syncthing/syncthing/releases.

What's Changed

Fixes

• fix(config): deep copy configuration defaults (fixes #9916) by @hazemKrimi in #10101
• fix(config): mark audit log options as needing restart (fixes #10099) by @marbens-arch in #10100
• fix(versioner): fix perms of created folders (fixes #9626) by @ashishbhate in #10105
• fix(syncthing): ensure both config and data dirs exist at startup (fixes #10126) by @calmh in #10127
• fix(gui): update uncamel() to handle strings like 'IDs' (fixes #10128) by @luckman212 in #10131

Features

• feat(gui): close a modal when pressing ESC after switching modal tabs (fixes #9489) by @hazemKrimi in #10092

Other

• chore(gui): add Serbian (sr) translation template by @acolomb in #10116
• build: reactivate golangci-lint by @calmh in #10118
• chore: move golangci-lint & meta to separate PR-only workflow by @calmh in #10119
• refactor: use slices.Contains to simplify code by @pullmerge in #10121
• build: process for automatic release tags by @calmh in #10133
• refactor: use slices package for sort by @mrclmr in #10132
• refactor: use slices package for sorting by @mrclmr in #10136
• docs: general notes about v2 coming by @calmh in #10135
• build: add labeler workflow for PRs by @calmh in #10143

New Contributors

• @hazemKrimi made their first contribution in #10092
• @pullmerge made their first contribution in #10121
• @ashishbhate made their first contribution in #10105
• @mrclmr made their first contribution in #10132

Full Changelog: v1.29.6...v1.29.7-rc.3

Major changes in 2.0.0

• Database backend switched from LevelDB to SQLite. There is a migration on
  first launch which can be lengthy for larger setups. The new database is
  easier to understand and maintain and, hopefully, less buggy.

• Deleted items are no longer kept forever in the database, instead they are
  forgotten after six months. If your use case require deletes to take
  effect after more than a six month delay, set the
  --db-delete-retention-interval command line option or corresponding
  environment variable to zero, or a longer time interval of your choosing.

• Modernised command line options parsing. Old single-dash long options are
  no longer supported, e.g. -home must be given as --home. All serve
  options are now also accepted as environment variables. See syncthing serve --help for details.

• Rolling hash detection of shifted data is no longer supported as this
  effectively never helped. Instead, scanning and syncing is faster and more
  efficient without it.

• A "default folder" is no longer created on first startup.

What's Changed

• chore: remove abandoned next-gen-gui experiment by @calmh in #10004
• chore: remove weak hashing which does not pull its weight by @calmh in #10005
• chore: switch database engine to sqlite (fixes #9954) by @calmh in #9965
• chore: harmonise command line flags by @calmh in #10007
• chore(db): increase journal limit to 64MiB by @bt90 in #10022
• chore: forget deleted files older than six months (fixes #6284) by @calmh in #10023
• fix(db): handle large numbers of blocks in update by @calmh in #10025
• chore(db): use shorter read transactions and periodic checkpoint for smaller WAL by @calmh in #10027
• fix(syncthing): make directory flags global for all commands by @calmh in #10028
• chore: configurable delete retention interval by @calmh in #10030
• chore(db): fix debug logging by @bt90 in #10033
• chore(db): buffer pulled files for smaller WAL by @calmh in #10036
• chore(db): use one SQLite database per folder by @calmh in #10042
• chore(model): delay starting a pull while there are incoming index updates by @calmh in #10041
• fix(sqlite): apply options by @pixelspark in #10049
• fix(db): version vector serialisation :( by @calmh in #10050
• chore(syncthing): remove "default" folder concept by @calmh in #10068
• fix(model): loop-break regression while block copying in puller by @imsodin in #10069
• fix(model): close fd immediately in copier by @imsodin in #10079
• build(deps): update dependencies by @calmh in #10091
• chore(syncthing): ensure migrated database is closed before exiting by @xjtdy888 in #10076
• chore(db, model): simplify per hash DB lookup in copier by @imsodin in #10080
• fix(model): use same folder first in copier by @imsodin in #10093
• feat(gui): close a modal when pressing ESC after switching modal tabs (fixes #9489) by @hazemKrimi in #10092
• chore(model): refactor copier for more flatness by @imsodin in #10094
• fix(config): deep copy configuration defaults (fixes #9916) by @hazemKrimi in #10101
• fix(config): mark audit log options as needing restart (fixes #10099) by @marbens-arch in #10100
• fix(model): correct bufferpool handling; simplify by @calmh in #10113
• chore(gui): add Serbian (sr) translation template by @acolomb in #10116
• build: reactivate golangci-lint by @calmh in #10118
• feat: add syncthing debug database-statistics command by @calmh in #10117
• chore: move golangci-lint & meta to separate PR-only workflow by @calmh in #10119
• build(deps): update dependency due to build breakage by @calmh in #10120
• refactor: use slices.Contains to simplify code by @pullmerge in #10121
• fix(versioner): fix perms of created folders (fixes #9626) by @ashishbhate in #10105
• fix(syncthing): ensure both config and data dirs exist at startup (fixes #10126) by @calmh in #10127
• build: process for automatic release tags by @calmh in #10133
• refactor: use slices package for sort by @mrclmr in #10132
• fix(gui): update uncamel() to handle strings like 'IDs' (fixes #10128) by @luckman212 in #10131
• build: upgrade setup-zig action by @calmh in #10134

New Contributors

• @hazemKrimi made their first contribution in #10092
• @pullmerge made their first contribution in #10121
• @ashishbhate made their first contribution in #10105
• @mrclmr made their first contribution in #10132

Full Changelog: v1.29.6...v2.0.0-rc.17

What's Changed

• build(deps): update dependencies by @calmh in #10091
• feat(gui): close a modal when pressing ESC after switching modal tabs (fixes #9489) by @hazemKrimi in #10092
• fix(config): deep copy configuration defaults (fixes #9916) by @hazemKrimi in #10101
• fix(config): mark audit log options as needing restart (fixes #10099) by @marbens-arch in #10100
• chore(gui): add Serbian (sr) translation template by @acolomb in #10116
• build: reactivate golangci-lint by @calmh in #10118
• chore: move golangci-lint & meta to separate PR-only workflow by @calmh in #10119
• build(deps): update dependency due to build breakage by @calmh in #10120
• refactor: use slices.Contains to simplify code by @pullmerge in #10121
• fix(versioner): fix perms of created folders (fixes #9626) by @ashishbhate in #10105
• fix(syncthing): ensure both config and data dirs exist at startup (fixes #10126) by @calmh in #10127
• build: process for automatic release tags by @calmh in #10133
• refactor: use slices package for sort by @mrclmr in #10132
• fix(gui): update uncamel() to handle strings like 'IDs' (fixes #10128) by @luckman212 in #10131

New Contributors

• @hazemKrimi made their first contribution in #10092
• @pullmerge made their first contribution in #10121
• @ashishbhate made their first contribution in #10105
• @mrclmr made their first contribution in #10132

Full Changelog: v1.29.6...v1.29.7-rc.2

What's Changed

• build(deps): update dependencies by @calmh in #10091
• feat(gui): close a modal when pressing ESC after switching modal tabs (fixes #9489) by @hazemKrimi in #10092
• fix(config): deep copy configuration defaults (fixes #9916) by @hazemKrimi in #10101
• fix(config): mark audit log options as needing restart (fixes #10099) by @marbens-arch in #10100
• chore(gui): add Serbian (sr) translation template by @acolomb in #10116
• build: reactivate golangci-lint by @calmh in #10118
• chore: move golangci-lint & meta to separate PR-only workflow by @calmh in #10119
• build(deps): update dependency due to build breakage by @calmh in #10120

New Contributors

• @hazemKrimi made their first contribution in #10092

Full Changelog: v1.29.6...v1.29.7-rc.1

Major changes

• Database backend switched from LevelDB to SQLite. There is a migration on first launch which can be lengthy for larger setups. The new database is easier to understand and maintain and, hopefully, less buggy.
• Deleted items are no longer kept forever in the database, instead they are forgotten after six months. If your use case require deletes to take effect after more than a six month delay, set the --db-delete-retention-interval command line option or corresponding environment variable to zero, or a longer time interval of your choosing.
• Modernised command line options parsing. Old single-dash long options are no longer supported, e.g. -home must be given as --home. All serve options are now also accepted as environment variables.
• Rolling hash detection of shifted data is no longer supported as this effectively never helped. Instead, scanning and syncing is faster and more efficient without it.
• A "default folder" is no longer created on first startup.

Debian packages

deb [signed-by=/etc/apt/keyrings/syncthing-archive-keyring.gpg] https://apt.syncthing.net/ syncthing v2

Docker image

ghcr.io/syncthing/syncthing:v2.0.0-beta.16

What's Changed

• chore(gui): add Serbian (sr) translation template by @acolomb in #10116
• build: reactivate golangci-lint by @calmh in #10118
• feat: add syncthing debug database-statistics command by @calmh in #10117

Full Changelog: v2.0.0-rc.15...v2.0.0-rc.16

What's Changed

• fix(config): deep copy configuration defaults (fixes #9916) by @hazemKrimi in #10101
• fix(config): mark audit log options as needing restart (fixes #10099) by @marbens-arch in #10100
• fix(model): correct bufferpool handling; simplify by @calmh in #10113

Full Changelog: v2.0.0-rc.14...v2.0.0-rc.15

What's Changed

• fix(model): close fd immediately in copier by @imsodin in #10079
• build(deps): update dependencies by @calmh in #10091
• chore(syncthing): ensure migrated database is closed before exiting by @xjtdy888 in #10076
• chore(db, model): simplify per hash DB lookup in copier by @imsodin in #10080
• fix(model): use same folder first in copier by @imsodin in #10093
• feat(gui): close a modal when pressing ESC after switching modal tabs (fixes #9489) by @hazemKrimi in #10092
• chore(model): refactor copier for more flatness by @imsodin in #10094

New Contributors

• @hazemKrimi made their first contribution in #10092

Full Changelog: v2.0.0-rc.13...v2.0.0-rc.14

What's Changed

• chore(lib): expose model methods to obtain progress by @pixelspark in #9886
• feat(gui): explanation to options enabled or disabled per folder type by @tomasz1986 in #9367
• fix(gui): validate device ID in canonical form (fixes #7291) by @mathias4833 in #10006
• fix(config): remove discontinued primary STUN server (fixes #10008) by @marbens-arch in #10009
• fix(stun): better error handling (ref #10008) by @calmh in #10010
• chore(config): remove discontinued secondary STUN servers (fixes #10011) by @marbens-arch in #10012
• chore(fs): speed up case normalization by @bt90 in #10013
• build(deps): update dependencies by @calmh in #10020
• feat(fs, config): add support for custom filesystem type construction by @pixelspark in #9887
• build: replace underscore in Debian version by @bt90 in #10032
• chore(model): add metric for total number of conflicts by @swenske in #10037
• fix(config): properly apply defaults when reading folder configuration by @pixelspark in #10034
• fix(config): zero filesystemtype is "basic" by @calmh in #10038
• build: push artifacts to Azure by @calmh in #10044
• chore(config): resolve primary STUN servers via SRV record by @bt90 in #10031
• chore(fs): changes to allow Filesystem to be implemented externally by @pixelspark in #10040
• fix(strings): differentiate setup(n) and set(v) up by @systemcrash in #10024
• fix(gui): mark unseen disconnected devices as inactive by @tomasz1986 in #10048
• fix(syncthing): use separate lock file instead of locking the certificate (fixes #10053) by @calmh in #10054
• feat(api, gui): allow authentication bypass for metrics by @swenske in #10045
• chore: add missing copyright in new files from infra branch by @calmh in #10055
• fix(osutil): give threads same I/O priority on Linux by @TheCreeper in #10063
• chore(syncthing): remove support for TLS 1.2 sync connections by @calmh in #10064
• chore(gui): update dependency copyrights, add script for periodic maintenance by @rasa in #10067
• chore(api): log X-Forwarded-For by @bt90 in #10035
• feat(config): add option for audit file (fixes #9481) by @marbens-arch in #10066
• chore(gui): use go list --deps for dependency list by @rasa in #10071
• fix(strelaysrv): make the session limiter session-dependent (fixes #10072) by @szu17dmy in #10073

New Contributors

• @marbens-arch made their first contribution in #10009
• @swenske made their first contribution in #10037
• @systemcrash made their first contribution in #10024
• @TheCreeper made their first contribution in #10063
• @szu17dmy made their first contribution in #10073

Full Changelog: v1.29.5...v1.29.6

What's Changed

• chore(lib): expose model methods to obtain progress by @pixelspark in #9886
• feat(gui): explanation to options enabled or disabled per folder type by @tomasz1986 in #9367
• chore: remove abandoned next-gen-gui experiment by @calmh in #10004
• chore: remove weak hashing which does not pull its weight by @calmh in #10005
• chore: switch database engine to sqlite (fixes #9954) by @calmh in #9965
• fix(gui): validate device ID in canonical form (fixes #7291) by @mathias4833 in #10006
• fix(config): remove discontinued primary STUN server (fixes #10008) by @marbens-arch in #10009
• fix(stun): better error handling (ref #10008) by @calmh in #10010
• chore(config): remove discontinued secondary STUN servers (fixes #10011) by @marbens-arch in #10012
• chore(fs): speed up case normalization by @bt90 in #10013
• chore: harmonise command line flags by @calmh in #10007
• build(deps): update dependencies by @calmh in #10020
• chore(db): increase journal limit to 64MiB by @bt90 in #10022
• chore: forget deleted files older than six months (fixes #6284) by @calmh in #10023
• fix(db): handle large numbers of blocks in update by @calmh in #10025
• chore(db): use shorter read transactions and periodic checkpoint for smaller WAL by @calmh in #10027
• fix(syncthing): make directory flags global for all commands by @calmh in #10028
• chore: configurable delete retention interval by @calmh in #10030
• feat(fs, config): add support for custom filesystem type construction by @pixelspark in #9887
• build: replace underscore in Debian version by @bt90 in #10032
• chore(db): fix debug logging by @bt90 in #10033
• chore(db): buffer pulled files for smaller WAL by @calmh in #10036
• chore(model): add metric for total number of conflicts by @swenske in #10037
• fix(config): properly apply defaults when reading folder configuration by @pixelspark in #10034
• fix(config): zero filesystemtype is "basic" by @calmh in #10038
• chore(db): use one SQLite database per folder by @calmh in #10042
• chore(model): delay starting a pull while there are incoming index updates by @calmh in #10041
• build: push artifacts to Azure by @calmh in #10044
• chore(config): resolve primary STUN servers via SRV record by @bt90 in #10031
• chore(fs): changes to allow Filesystem to be implemented externally by @pixelspark in #10040
• fix(strings): differentiate setup(n) and set(v) up by @systemcrash in #10024
• fix(gui): mark unseen disconnected devices as inactive by @tomasz1986 in #10048
• fix(sqlite): apply options by @pixelspark in #10049
• fix(db): version vector serialisation :( by @calmh in #10050
• fix(syncthing): use separate lock file instead of locking the certificate (fixes #10053) by @calmh in #10054
• feat(api, gui): allow authentication bypass for metrics by @swenske in #10045
• chore: add missing copyright in new files from infra branch by @calmh in #10055
• fix(osutil): give threads same I/O priority on Linux by @TheCreeper in #10063
• chore(syncthing): remove support for TLS 1.2 sync connections by @calmh in #10064
• chore(gui): update dependency copyrights, add script for periodic maintenance by @rasa in #10067
• chore(syncthing): remove "default" folder concept by @calmh in #10068
• chore(api): log X-Forwarded-For by @bt90 in #10035
• feat(config): add option for audit file (fixes #9481) by @marbens-arch in #10066
• fix(model): loop-break regression while block copying in puller by @imsodin in #10069
• chore(gui): use go list --deps for dependency list by @rasa in #10071
• fix(strelaysrv): make the session limiter session-dependent (fixes #10072) by @szu17dmy in #10073

New Contributors

• @marbens-arch made their first contribution in #10009
• @swenske made their first contribution in #10037
• @systemcrash made their first contribution in #10024
• @TheCreeper made their first contribution in #10063
• @szu17dmy made their first contribution in #10073

Full Changelog: v2.0.0-rc.12...v2.0.0-rc.13