forked from TrueCloudLab/restic
6e1a3987b7
This commit adds a command called `self-update` which downloads the latest released version of restic from GitHub and replacing the current binary with it. It does not rely on any external program (so it'll work everywhere), but still verifies the GPG signature using the embedded GPG public key. By default, the `self-update` command is hidden behind the `selfupdate` built tag, which is only set when restic is built using `build.go`. The reason for this is that downstream distributions will then not include the command by default, so users are encouraged to use the platform-specific distribution mechanism.
187 lines
10 KiB
Go
187 lines
10 KiB
Go
package selfupdate
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import (
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"bytes"
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"fmt"
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"golang.org/x/crypto/openpgp"
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)
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var key = []byte(`
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-----BEGIN PGP PUBLIC KEY BLOCK-----
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AhsMAAoJEJGmhovT96kHb/0P/0LXAOXeyTDWOHEoPFKIXS4y9tl2PA6hq1HOgthP
|
|
1B2P6eIjpB7UGTSieWpKeqkkv7SZFTol2H0JlhZlhh1IkxS/aHHAl2Km6TLkk6QL
|
|
GGkKOFFAiU51iVkJQumbTKMlx11DXA0Jy6mVsUWoz3Ua9cFwrhuCRpKxW61xTEaX
|
|
dksgOUBKWH+mF8MtJtRedwHXjmNxaKTAKEsjmPFPn8i75D48JIbq9L+rHLxFTeSR
|
|
LShj7lZR1I24+UofA2Tllh4V14rSsUkfIYsKuwCGenJ+sPhpwqHohfJzTewXk+TK
|
|
wkilwVgTg7AYCeywP7XqkhA4om9aJRc1cqPcrknsXJLz4Vp7JX8bCtRqF2JT7wsM
|
|
wtHMNAtItLa+WYnkvt9/ng9Zt5i0fHZBwfVazWP+/4LAkb9fE4vO2IusV0jK00Sk
|
|
7Gt65A32qY75Lze6NRUk2gwizMLIdMvag9AuIUH52RScNVoVXIkmw1q57KshBL1M
|
|
VWRd7DUpFGpw8HKkqNlJKPAv+UsJAp7rSkfH9CAYwFzjbs7BST5Cuynac0CgZGQO
|
|
F0793mKAsbMePuEIzkR0ZdA/F0Mar9/tQLAtU3pXRrThkLUNmr8Qm9rPGTjrNv7k
|
|
ANWsgd4bu0PW5SVm+eFjoTRpNI9P/xrCF8fgLcZ2JPO/wKqyIDcKxEZq978lxWDm
|
|
CwGc
|
|
=AV20
|
|
-----END PGP PUBLIC KEY BLOCK-----
|
|
`)
|
|
|
|
// GPGVerify checks the authenticity of data by verifying the signature sig,
|
|
// which must be ASCII armored (base64). When the signature matches, GPGVerify
|
|
// returns true and a nil error.
|
|
func GPGVerify(data, sig []byte) (ok bool, err error) {
|
|
keyring, err := openpgp.ReadArmoredKeyRing(bytes.NewReader(key))
|
|
if err != nil {
|
|
fmt.Printf("reading keyring failed")
|
|
return false, err
|
|
}
|
|
|
|
_, err = openpgp.CheckArmoredDetachedSignature(keyring, bytes.NewReader(data), bytes.NewReader(sig))
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
return true, nil
|
|
}
|