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Author | SHA1 | Date |
---|---|---|
Michael Eischer | a3fda509f5 | |
Michael Eischer | faffd15d13 | |
Michael Eischer | 347e9d0765 | |
Altan Orhon | 871ea1eaf3 | |
Michael Eischer | 1b9e89b478 | |
Michael Eischer | a95608522b |
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@ -0,0 +1,10 @@
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Enhancement: Allow specifying `--host` via environment variable
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Restic commands that operate on snapshots, such as `restic backup` and
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`restic snapshots`, support the `--host` flag to specify the hostname for
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grouoping snapshots. They now permit selecting the hostname via the
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environment variable `RESTIC_HOST`. `--host` still takes precedence over the
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environment variable.
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https://github.com/restic/restic/issues/4733
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https://github.com/restic/restic/pull/4734
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@ -114,7 +114,7 @@ func init() {
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f.BoolVar(&backupOptions.StdinCommand, "stdin-from-command", false, "interpret arguments as command to execute and store its stdout")
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f.Var(&backupOptions.Tags, "tag", "add `tags` for the new snapshot in the format `tag[,tag,...]` (can be specified multiple times)")
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f.UintVar(&backupOptions.ReadConcurrency, "read-concurrency", 0, "read `n` files concurrently (default: $RESTIC_READ_CONCURRENCY or 2)")
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f.StringVarP(&backupOptions.Host, "host", "H", "", "set the `hostname` for the snapshot manually. To prevent an expensive rescan use the \"parent\" flag")
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f.StringVarP(&backupOptions.Host, "host", "H", "", "set the `hostname` for the snapshot manually (default: $RESTIC_HOST). To prevent an expensive rescan use the \"parent\" flag")
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f.StringVar(&backupOptions.Host, "hostname", "", "set the `hostname` for the snapshot manually")
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err := f.MarkDeprecated("hostname", "use --host")
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if err != nil {
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@ -137,6 +137,11 @@ func init() {
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// parse read concurrency from env, on error the default value will be used
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readConcurrency, _ := strconv.ParseUint(os.Getenv("RESTIC_READ_CONCURRENCY"), 10, 32)
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backupOptions.ReadConcurrency = uint(readConcurrency)
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// parse host from env, if not exists or empty the default value will be used
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if host := os.Getenv("RESTIC_HOST"); host != "" {
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backupOptions.Host = host
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}
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}
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// filterExisting returns a slice of all existing items, or an error if no
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@ -2,6 +2,7 @@ package main
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import (
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"context"
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"os"
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"github.com/restic/restic/internal/restic"
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"github.com/spf13/pflag"
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@ -14,17 +15,27 @@ func initMultiSnapshotFilter(flags *pflag.FlagSet, filt *restic.SnapshotFilter,
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if !addHostShorthand {
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hostShorthand = ""
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}
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flags.StringArrayVarP(&filt.Hosts, "host", hostShorthand, nil, "only consider snapshots for this `host` (can be specified multiple times)")
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flags.StringArrayVarP(&filt.Hosts, "host", hostShorthand, nil, "only consider snapshots for this `host` (can be specified multiple times) (default: $RESTIC_HOST)")
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flags.Var(&filt.Tags, "tag", "only consider snapshots including `tag[,tag,...]` (can be specified multiple times)")
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flags.StringArrayVar(&filt.Paths, "path", nil, "only consider snapshots including this (absolute) `path` (can be specified multiple times)")
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// set default based on env if set
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if host := os.Getenv("RESTIC_HOST"); host != "" {
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filt.Hosts = []string{host}
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}
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}
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// initSingleSnapshotFilter is used for commands that work on a single snapshot
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// MUST be combined with restic.FindFilteredSnapshot
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func initSingleSnapshotFilter(flags *pflag.FlagSet, filt *restic.SnapshotFilter) {
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flags.StringArrayVarP(&filt.Hosts, "host", "H", nil, "only consider snapshots for this `host`, when snapshot ID \"latest\" is given (can be specified multiple times)")
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flags.StringArrayVarP(&filt.Hosts, "host", "H", nil, "only consider snapshots for this `host`, when snapshot ID \"latest\" is given (can be specified multiple times) (default: $RESTIC_HOST)")
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flags.Var(&filt.Tags, "tag", "only consider snapshots including `tag[,tag,...]`, when snapshot ID \"latest\" is given (can be specified multiple times)")
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flags.StringArrayVar(&filt.Paths, "path", nil, "only consider snapshots including this (absolute) `path`, when snapshot ID \"latest\" is given (can be specified multiple times)")
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// set default based on env if set
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if host := os.Getenv("RESTIC_HOST"); host != "" {
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filt.Hosts = []string{host}
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}
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}
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// FindFilteredSnapshots yields Snapshots, either given explicitly by `snapshotIDs` or filtered from the list of all snapshots.
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@ -0,0 +1,61 @@
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package main
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import (
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"testing"
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"github.com/restic/restic/internal/restic"
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rtest "github.com/restic/restic/internal/test"
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"github.com/spf13/pflag"
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)
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func TestSnapshotFilter(t *testing.T) {
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for _, test := range []struct {
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name string
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args []string
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expected []string
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env string
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}{
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{
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"no value",
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[]string{},
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nil,
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"",
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},
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{
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"args only",
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[]string{"--host", "abc"},
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[]string{"abc"},
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"",
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},
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{
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"env default",
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[]string{},
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[]string{"def"},
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"def",
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},
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{
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"both",
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[]string{"--host", "abc"},
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[]string{"abc"},
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"def",
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},
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} {
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t.Run(test.name, func(t *testing.T) {
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t.Setenv("RESTIC_HOST", test.env)
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for _, mode := range []bool{false, true} {
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set := pflag.NewFlagSet("test", pflag.PanicOnError)
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flt := &restic.SnapshotFilter{}
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if mode {
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initMultiSnapshotFilter(set, flt, false)
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} else {
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initSingleSnapshotFilter(set, flt)
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}
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err := set.Parse(test.args)
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rtest.OK(t, err)
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rtest.Equals(t, test.expected, flt.Hosts, "unexpected hosts")
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}
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})
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}
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}
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@ -1,6 +1,7 @@
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package backend
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import (
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"context"
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"crypto/tls"
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"crypto/x509"
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"encoding/pem"
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@ -13,6 +14,7 @@ import (
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"github.com/peterbourgon/unixtransport"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/feature"
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)
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// TransportOptions collects various options which can be set for an HTTP based
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@ -66,14 +68,28 @@ func readPEMCertKey(filename string) (certs []byte, key []byte, err error) {
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// a custom rootCertFilename is non-empty, it must point to a valid PEM file,
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// otherwise the function will return an error.
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func Transport(opts TransportOptions) (http.RoundTripper, error) {
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dial := (&net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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DualStack: true,
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}).DialContext
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dialTimeout := dial
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if feature.Flag.Enabled(feature.HTTPTimeouts) {
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// inject timeoutConn to enforce progress
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dialTimeout = func(ctx context.Context, network, addr string) (net.Conn, error) {
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conn, err := dial(ctx, network, addr)
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if err != nil {
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return conn, err
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}
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return newTimeoutConn(conn, 5*time.Minute)
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}
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}
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// copied from net/http
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tr := &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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DialContext: (&net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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DualStack: true,
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}).DialContext,
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Proxy: http.ProxyFromEnvironment,
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DialContext: dialTimeout,
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ForceAttemptHTTP2: true,
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MaxIdleConns: 100,
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MaxIdleConnsPerHost: 100,
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@ -0,0 +1,172 @@
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package backend
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import (
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"net"
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"os"
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"sync"
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"time"
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)
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// timeoutConn will timeout if no read or write progress is made for progressTimeout.
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// This ensures that stuck network connections are interrupted after some time.
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// By using a timeoutConn within a http transport (via DialContext), sending / receing
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// the request / response body is guarded with a timeout. The read progress part also
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// limits the time until a response header must be received.
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//
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// The progressTimeout must be larger than the IdleConnTimeout of the http transport.
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//
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// The http2.Transport offers a similar functionality via WriteByteTimeout & ReadIdleTimeout.
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// However, those are not available for HTTP/1 connections. Thus, there's no builtin way to
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// enforce progress for sending the request body or reading the response body.
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// See https://github.com/restic/restic/issues/4193#issuecomment-2067988727 for details.
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type timeoutConn struct {
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conn net.Conn
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// timeout within which a read/write must make progress, otherwise a connection is considered broken
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// if no read/write is pending, then the timeout is inactive
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progressTimeout time.Duration
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// all access to fields below must hold m
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m sync.Mutex
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// user defined read/write deadline
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readDeadline time.Time
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writeDeadline time.Time
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// timestamp of last successful write (at least one byte)
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lastWrite time.Time
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}
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var _ net.Conn = &timeoutConn{}
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func newTimeoutConn(conn net.Conn, progressTimeout time.Duration) (*timeoutConn, error) {
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// reset timeouts to ensure a consistent state
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err := conn.SetDeadline(time.Time{})
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if err != nil {
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return nil, err
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}
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return &timeoutConn{
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conn: conn,
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progressTimeout: progressTimeout,
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}, nil
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}
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func (t *timeoutConn) Write(p []byte) (n int, err error) {
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t.m.Lock()
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timeout := t.writeDeadline
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t.m.Unlock()
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var zero time.Time
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if timeout != zero {
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// fall back to standard behavior if a timeout was set explicitly
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n, err := t.conn.Write(p)
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if n > 0 {
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t.m.Lock()
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t.lastWrite = time.Now()
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t.m.Unlock()
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}
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return n, err
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}
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// based on http2stickyErrWriter.Write from go/src/net/http/h2_bundle.go
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for {
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_ = t.conn.SetWriteDeadline(time.Now().Add(t.progressTimeout))
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nn, err := t.conn.Write(p[n:])
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n += nn
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if nn > 0 {
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// track write progress
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t.m.Lock()
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t.lastWrite = time.Now()
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t.m.Unlock()
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}
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if n < len(p) && nn > 0 && err == os.ErrDeadlineExceeded {
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// some data is still left to send, keep going as long as there is some progress
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continue
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}
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t.m.Lock()
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// restore configured deadline
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_ = t.conn.SetWriteDeadline(t.writeDeadline)
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t.m.Unlock()
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return n, err
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}
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}
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func (t *timeoutConn) Read(b []byte) (n int, err error) {
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t.m.Lock()
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timeout := t.readDeadline
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t.m.Unlock()
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var zero time.Time
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if timeout != zero {
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// fall back to standard behavior if a timeout was set explicitly
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return t.conn.Read(b)
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}
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var start = time.Now()
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for {
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_ = t.conn.SetReadDeadline(start.Add(t.progressTimeout))
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nn, err := t.conn.Read(b)
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t.m.Lock()
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lastWrite := t.lastWrite
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t.m.Unlock()
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if nn == 0 && err == os.ErrDeadlineExceeded && lastWrite.After(start) {
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// deadline exceeded, but write made some progress in the meantime
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start = lastWrite
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continue
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}
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t.m.Lock()
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// restore configured deadline
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_ = t.conn.SetReadDeadline(t.readDeadline)
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t.m.Unlock()
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return nn, err
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}
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}
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func (t *timeoutConn) Close() error {
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return t.conn.Close()
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}
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func (t *timeoutConn) LocalAddr() net.Addr {
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return t.conn.LocalAddr()
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}
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func (t *timeoutConn) RemoteAddr() net.Addr {
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return t.conn.RemoteAddr()
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}
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func (t *timeoutConn) SetDeadline(d time.Time) error {
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err := t.SetReadDeadline(d)
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err2 := t.SetWriteDeadline(d)
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if err != nil {
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return err
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}
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return err2
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}
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func (t *timeoutConn) SetReadDeadline(d time.Time) error {
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t.m.Lock()
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defer t.m.Unlock()
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// track timeout modifications, as the current timeout cannot be queried
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err := t.conn.SetReadDeadline(d)
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if err != nil {
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return err
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}
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t.readDeadline = d
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return nil
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}
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func (t *timeoutConn) SetWriteDeadline(d time.Time) error {
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t.m.Lock()
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defer t.m.Unlock()
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err := t.conn.SetWriteDeadline(d)
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if err != nil {
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return err
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}
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t.writeDeadline = d
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return nil
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}
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@ -8,6 +8,7 @@ const (
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DeprecateLegacyIndex FlagName = "deprecate-legacy-index"
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DeprecateS3LegacyLayout FlagName = "deprecate-s3-legacy-layout"
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DeviceIDForHardlinks FlagName = "device-id-for-hardlinks"
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HTTPTimeouts FlagName = "http-timeouts"
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)
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func init() {
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@ -15,5 +16,6 @@ func init() {
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DeprecateLegacyIndex: {Type: Beta, Description: "disable support for index format used by restic 0.1.0. Use `restic repair index` to update the index if necessary."},
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DeprecateS3LegacyLayout: {Type: Beta, Description: "disable support for S3 legacy layout used up to restic 0.7.0. Use `RESTIC_FEATURES=deprecate-s3-legacy-layout=false restic migrate s3_layout` to migrate your S3 repository if necessary."},
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DeviceIDForHardlinks: {Type: Alpha, Description: "store deviceID only for hardlinks to reduce metadata changes for example when using btrfs subvolumes. Will be removed in a future restic version after repository format 3 is available"},
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HTTPTimeouts: {Type: Beta, Description: "improve handling of stuck HTTP connections using timeouts."},
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})
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}
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Reference in New Issue